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Algebra and Logic Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the Algebra and Logic Seminar will be held on July 25, 2025 (Friday) at 1:00 pm (UTC+3) in Room 578 of IMI-BAS. A talk on: Distinctness of the “lifted” Kloosterman sums over the prime field Fp will be delivered by Lyubomir Borissov (IMI - BAS). Abstract Everybody is invited. Algebra and Logic Department, IMI - BAS http://www.math.bas.bg/algebra/seminarAiL/ ============================== =====================

Joint Seminar of the Analysis, Geometry and Topology Department

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Seminar "Analysis, geometry and topology" Tuesday, July 29-th, 1:00 pm, room 403 of IMI-BAS. Speaker: Asia Mainenti, IMI and ICMS, Sofia Hodge-Riemann balanced structures on non-Kähler manifolds Abstract: A Hodge-Riemann balanced structure on a complex manifold is the datum of a balanced metric whose (n-1)-th power can be decomposed into the wedge product of two differential forms, satisfying the classical Hodge-Riemann bilinear relations. Such structures were introduced by X. Chen and R. Wentworth, to generalize the nonabelian Hodge correspondence to non-Kähler Hermitian metrics. However, there are no known examples of Hodge-Riemann balanced structures on non-Kähler manifolds. The aim of this talk is to address this lack of examples, highlighting the relation with p-Kähler structures and discuss some obstruction results in the class of solvmanifolds. Lastly, [...]

ICMS–Sofia – International Conference Celebrating the Consortium IMSAC

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

From August 7 to 9, 2025, the Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences (IMI–BAS) will host the Celebrating the Consortium IMSAC – International Conference. The conference is jointly organized by the International Centre for Mathematical Sciences – Sofia (ICMS-Sofia) at IMI–BAS and the Institute for Mathematical Sciences of the Americas (IMSA) at the University of Miami. Programme. Zoom.

ICMS – Geometry at Large International Conference

Grand Hotel & SPA Primoretz, Burgas Burgas

The International Center for Mathematical Sciences (ICMS-Sofia) at the Institute of Mathematics and Informatics of the Bulgarian Academy of Sciences and the Institute for Mathematical Sciences of the Americas (IMSA) at the University of Miami are organizing the international conference Geometry at Large, which will be held in Burgas from August 11 to 14, 2025. Conference Programme

ICMS – New Developments on Arnold’s conjecture Workshop

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The International Center for Mathematical Sciences (ICMS-Sofia) at the Institute of Mathematics and Informatics of the Bulgarian Academy of Sciences and the Institute for Mathematical Sciences of the Americas (IMSA) at the University of Miami are organizing WORKSHOP New Developments on Arnold’s conjecture which will be held in IMI on August 16 and 17, 2025.

ICMS Geometry Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next session of the Geometry Seminar of ICMS will be held on Wednesday, August 20th, at 16:00, room 403 and via Zoom: https://icms.bg/friezes-geometry-seminar-talk-by-andrei-zabolotskii/ Zoom link: https://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1

ICMS-Sofia: Workshop in Algebraic Geometry and Physics 2025: “Geometry and Physics of Higgs moduli”

Катарино Спа 41.88957952531981, 23.42650382991656, Разлог, Разлог

The conference is organized by the International Center for Mathematical Sciences (ICMS-Sofia) at the Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences, the International School for Advanced Studies (SISSA), Trieste, the American University in Bulgaria (AUBG) and the Institute of the Mathematical Sciences of the Americas (IMSA) with financial support from the Simons Foundation, the Bulgarian Ministry of Education and Science, SISSA and AUBG. The workshop is the 20th installment of a sequence of conferences and schools, organized since 1996. It aims to bring together leading experts and early-career researchers working on various aspects of the geometry and physics of Higgs bundle moduli, non-abelian Hodge theory, symplectic geometry and related fields like integrable systems, deformation theory and derived geometry.

ICMS Workshop: Recent Developments on Tropical Sandpiles and Related Subjects

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The International Center for Mathematical Sciences – Sofia (ICMS-Sofia) presents Recent Developments on Tropical Sandpiles and Related Subjects Tuesday, 23 September and Thursday, 25 September 2025 ICMS-Sofia, Room 403 and via Zoom You may find the details here: https://icms.bg/recent-developments-on-tropical-sandpiles-and-related-subjects/ In addition, we plan to have a “round table” meeting at room 378 on Wednesday, September 24, at 14:00, to openly exchange ideas while enjoying drinks and snacks.

Fifteenth International Conference Digital Presentation and Preservation of Cultural and Scientific Heritage – DiPP2025

Културен център "Морско казино" - Бургас Приморски парк, Бургас, Burgas

From September 25 to 28, 2025, the Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences, under the patronage of UNESCO and with the support of the National Scientific Fund of Bulgaria and the Municipality of Burgas, is organizing the Fifteenth International Conference Digital Presentation and Preservation of Cultural and Scientific Heritage – DiPP2025. The distinguished scientific event DiPP2025 will be opened on September 25, 2025, at 12:30 PM at the Cultural Center Sea Casino in Burgas. This event supports Burgas' candidature for European Capital of Culture 2032. Co-organizers: Regional Academic Center of BAS – Burgas, Regional Historical Museum – Burgas, Burgas Free University, Regional Library Peyo Yavorov, Burgas, Burgas State University Prof. A. Zlatarov Accompanying events: The 16th National Information Day: [...]

ICMS Workshop: Recent Developments on Tropical Sandpiles and Related Subjects

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The International Center for Mathematical Sciences – Sofia (ICMS-Sofia) presents Recent Developments on Tropical Sandpiles and Related Subjects Tuesday, 23 September and Thursday, 25 September 2025 ICMS-Sofia, Room 403 and via Zoom You may find the details here: https://icms.bg/recent-developments-on-tropical-sandpiles-and-related-subjects/ In addition, we plan to have a “round table” meeting at room 378 on Wednesday, September 24, at 14:00, to openly exchange ideas while enjoying drinks and snacks.

Joint Seminar of the AGT Department and ICMS

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Joint Seminar of Analysis, Geometry and Topology Department and International Center for Mathematical Sciences – Sofia (ICMS-Sofia) Concircularly Semi-Symmetric Metric Connection Miroslav Maksimović University of Priština in Kosovska Mitrovica, Kosovska Mitrovica, Serbia, and Institute of Mathematics and Informatics, Bulgarian Academy of Sciences, Bulgaria September 30, 2025, 11:00 h – room 403 Abstract. A concircularly semi-symmetric metric connection is a special class of semi-symmetric metric connection when its generator is a concircular vector. In this talk, we will present results on this connection on pseudo-Riemannian manifolds, and in particular, we will observe the application to Lorentzian manifolds and the theory of relativity. We demonstrate that a Lorentzian manifold reduces to a GRW space-time when the generator of the observed connection is a unit timelike vector. [...]

Algebra and Logic Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the Algebra and Logic Seminar will take place in hybrid form on October 3, 2025 (Friday) at 1:00 pm (UTC+3) in Room 578 of IMI-BAS and online via Zoom. A talk on: Decomposition of Tschirnhausen Modules for Coverings on Decomposable P1-Bundles will be delivered by Hristo Iliev (American University in Bulgaria and IMI-BAS). Abstract Link to the zoom meeting: Https://us02web.zoom.us/j/85137375021?pwd=RE5QczdFTE1xL1R6MnI2b1lkcGczQT09 Everybody is invited. Algebra and Logic Department, IMI - BAS http://www.math.bas.bg/algebra/seminarAiL/ ============================== =====================

Theory of Atoms mini-course

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The mini-course on the Theory of Atoms will return next Monday (October 6) from 15:30 to 17:00 in room 403 with a lecture on Quantum Multiplication and Frobenius Algebras Further details and the Zoom link are on the course webpage: https://icms.bg/theory-of-atoms-via-examples/

Joint meeting of the Algebra and Logic Seminar and the Seminar of the Department of Differential Equations and Mathematical Physics

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

A joint meeting of the the Algebra and Logic Seminar and the Seminar of the Department of Differential Equations and Mathematical Physics will be held on October 10, 2025, (Friday), at 1:00 pm in Room 578 of IMI - BAS and online via Zoom. A talk on On Z5 reduction of soliton equations related to sl(5) algebra  will be delivered by Vladimir Gerdjikov (IMI-BAS). This is joint work with B. Kostadinov (IMI-BAS), S. Mishev (NBU), and A. Stefanov (FMU-SU). Abstract: Recently a new approach to the integrable systems, extending and generalizing the ISM was formulated. It is based on an effective parametrization of the Riemann-Hilbert problem, which allows one to extend the class of Lax pairs and effectively derive only the corresponding NLEE as compatibility condition [...]

ICMS: Mini-course on Theory of Atoms via Examples – Lectures 5 and 6

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Theory of Atoms via Examples The Theory of Atoms is a recent formalism introduced by Katzarkov, Kontsevich, Pantev, and Yu, which aims to integrate classical Hodge theory with symplectic geometry, seeking applications in birational geometry. To properly understand it, we must gather concepts from many areas of knowledge, ranging from Gromov-Witten theory and enumerative algebraic geometry to classical and noncommutative Hodge theory. This series is designed to be an example-driven introduction, providing the essential background needed to understand this new theory. Programme: Place: Room 403 (IMI - BAS) Lectures 1 & 2: Gromov–Witten Theory Thursday, 18 September 2025 10:30–12:00 & 14:30–16:00 Lecture 3: Quantum Multiplication and Frobenius Algebras Monday, 6 October 2025 15:30–17:00 Lecture 4: More on quantum multiplication Wednesday, 8 October 2025 15:30–17:00 Lecture [...]

Applied Mathematics Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the Applied Mathematics Seminar will be held on October 15, 2025 (Wednesday) at 3:00 pm in Room 503 of IMI - BAS. A talk on Stochastic scattering control of Walsh's spider diffusion with optimal diffraction probability measure selected from its own local-time will be delivered by Isaac Ohavi, who is working in fields such as stochastic control, stochastic optimization, and partial differential equations. Abstract: In this talk, we start by giving a short introduction on "classical" stochastic control theory and its connection with second order nonlinear PDE theory. Then, we present Walsh’s spider diffusions living on a star-shaped network, and explain how these processes are at the origin of new problems of stochastic scattering control. A main direction is to focus and understand [...]

ICMS: Mini-course on Theory of Atoms via Examples – Lecture 7

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Theory of Atoms via Examples The Theory of Atoms is a recent formalism introduced by Katzarkov, Kontsevich, Pantev, and Yu, which aims to integrate classical Hodge theory with symplectic geometry, seeking applications in birational geometry. To properly understand it, we must gather concepts from many areas of knowledge, ranging from Gromov-Witten theory and enumerative algebraic geometry to classical and noncommutative Hodge theory. This series is designed to be an example-driven introduction, providing the essential background needed to understand this new theory. Programme: Place: Room 403 (IMI - BAS) Lectures 1 & 2: Gromov–Witten Theory Thursday, 18 September 2025 10:30–12:00 & 14:30–16:00 Lecture 3: Quantum Multiplication and Frobenius Algebras Monday, 6 October 2025 15:30–17:00 Lecture 4: More on quantum multiplication Wednesday, 8 October 2025 15:30–17:00 Lecture [...]

Workshop on Codes, Orthogonal Arrays, and Related Areas

Online

Workshop on Codes, Orthogonal Arrays, and Related Areas   One-day workshop on "Codes, Orthogonal Arrays, and Related Areas" will be held at Sabancı University, Türkiye. The event aims to bring together researchers working on coding theory, combinatorial designs, and related algebraic structures to discuss recent developments and explore potential collaborations. Organizers: Peter Boyvalenkov (Institute of Mathematics and Informatics, Bulgarian Academy of Sciences, Bulgaria) Ferruh Özbudak (Sabancı University, Türkiye) Program 13:40 – 14:30 Stefka Bouyuklieva (Veliko Tarnovo University, Bulgaria) "Linear codes over a finite field with a given permutation automorphism" 14:40 – 15:30 Maryam Bajalan (Institute of Mathematics and Informatics, Bulgarian Academy of Sciences, Bulgaria) "Codes over rings, with emphasis on polycyclic codes" 15:30 – 15:50 Coffee Break 15:50 – 16:20 Iliya Bouyukliev (Institute of [...]

ICMS: Mini-course on Theory of Atoms via Examples – Lectures 8 and 9

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Theory of Atoms via Examples The Theory of Atoms is a recent formalism introduced by Katzarkov, Kontsevich, Pantev, and Yu, which aims to integrate classical Hodge theory with symplectic geometry, seeking applications in birational geometry. To properly understand it, we must gather concepts from many areas of knowledge, ranging from Gromov-Witten theory and enumerative algebraic geometry to classical and noncommutative Hodge theory. This series is designed to be an example-driven introduction, providing the essential background needed to understand this new theory. Programme: Place: Room 403 (IMI - BAS) Lectures 1 & 2: Gromov–Witten Theory Thursday, 18 September 2025 10:30–12:00 & 14:30–16:00 Lecture 3: Quantum Multiplication and Frobenius Algebras Monday, 6 October 2025 15:30–17:00 Lecture 4: More on quantum multiplication Wednesday, 8 October 2025 15:30–17:00 Lecture [...]

Singularities Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Date and time: October 20, 2025, 2:00 pm Place: Room 578, IMI - BAS Title: The complete intersection discrepancy of curves Lecturer: Andrei Bengus-Lasnier (ИМИ - БАН) Abstract: In this talk I will introduce an invariant for reduced curves called the complete intersection discrepancy (cid for short). This numerical quantity arose naturally when trying to generalize known formulas for complete intersection curves to general curves. The cid then serves as a correction term in these formulas. I will present some of the cid's basic properties and derive two formulas. The first relates basic invariants such as Milnor number, its multiplicity and the multiplicity of its Jacobian ideal, and generalizes a well-known result in singularity theory due to Lê, Greuel and Teissier. The second formula [...]

Lecture by Prof. Mark Saul

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Meeting with Dr. Mark Saul at IMI–BAS On October 26 this year, we will have the pleasure of hearing a lecture by Dr. Mark Saul on the topic: Paths in Graphs: from the Bridges of Königsberg through Protein Sequencing to Picasso’s One-Liners Where? – In the Conference Hall of IMI–BAS When? – 10:00–11:00 The event will be followed (11:15–12:00) by a presentation of good STEAM practices by teachers, in the form of a Posterless Poster Session without a Big Screen (models, computer-based work, or your students’ creations). 12:00–13:00 – Light refreshments and informal conversation with Dr. Saul. Dr. Mark Saul is a recognized teacher, RSI Director for 10 years, and Director of Competitions for the Mathematical Association of America. He has coached and taught numerous [...]

Singularities Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Date and time: October 27, 2025, 2:00 pm Speaker:  Erik Paemurru (IMI-BAS) Title: Log canonical thresholds of reduced plane curves Abstract: I will give an overview of normal forms of plane curve singularities and define the log canonical threshold. I will then compute log canonical thresholds of all reduced plane curve singularities of degree at most five and all reduced plane curve singularities of degree d and multiplicity d-1. This is based on the works https://arxiv.org/abs/2404.18238 and https://arxiv.org/abs/2508.21676

A New Course on Sandpiles and Tropical Geometry

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

A new course on the interplay between abelian sandpiles (prototypical model of self-organized criticality) and tropical geometry (contemporary branch of mathematics) will start on October 28th: https://icms.bg/sandpiles-and-tropical-geometry-specialized-phd-course/ The meetings are planned to be from 16:00 to 19:00 (GMT+3) on most Tuesdays and Thursdays until the end of the year — with two hours of lectures followed by one hour of discussions/exercises. The first two meetings are scheduled for 28th and 30th of October, room 578 at IMI-BAS (the room may change in November) and Zoom (the link will remain the same): https://us06web.zoom.us/j/86556797224?pwd=g1gjtRHFenzbgJ9s29kOo1nZQVqcoR.1 The meetings will not be recorded; however, the notes will be made available at the website of the course.

XV-th International Conference “Mathematics of Informational Modeling”

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The 15th International Conference "Mathematics in Information Modeling" will be held on November 4 and 5, 2025, in Room 578 of the Institute of Mathematics and Informatics, BAS, together with the Annual Scientific Session of the "Information Modeling" Department. Conference Program The conference will also be available on Zoom at the following link: https://us02web.zoom.us/j/82189891867?pwd=ERVhHO1b7sLckdoKIZdjICqnxrW9vK.1

ICMS Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

ICMS Seminar Tuesday, November 4, 2025, 1:00 pm, Room 403, IMI-BAS Lecturer: Leonardo Cavenaghi (ICMS, IMI-BAS) Topic: Exotic phenomena in topology and geometry   Abstract: This talk, aimed at a general audience of mathematicians, discusses very geometric models of exotic spheres. Exotic spheres are manifolds homeomorphic to classical spheres but not diffeomorphic to them. We will outline some constructions via group actions and discuss their admissible geometries. For instance, until this day, it is not known whether an exotic sphere admits a metric of positive sectional curvature, but some do not even admit positive scalar curvature. In this talk, we also outline how one can indirectly study their geometries, aiming to gain a better understanding of their admissible geometries, for example, regarding the existence [...]

National Seminar on Probability and Statistics

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the National Seminar on Probability and Statistics will be held on November 4, 2025, at 2:00 p.m. in Room 503 of the Institute of Mathematics and Informatics. A talk on: On the optimal prediction of extreme events will be delivered by Stilian Stoev (University of Michigan). Abstract  

Atom Theory Research Group Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Seminar Details Speaker: Ludmil Katzarkov (ICMS, IMI-BAS, University of Miami) Title: Recent Advancements in the Theory of Atoms Date & Time: Tuesday, November 4, 2025, at 3:00 PM Place (In-Person): Room 403, IMI-BAS Online Attendance (Zoom) Zoom Link: https://us02web.zoom.us/j/86497450517?pwd=39OtfySJ4SbhKihr1IpaIz32dD7iBp.1 Meeting ID: 864 9745 0517 Passcode: 181023 For further information, always keep track of our website: https://icms.bg/research-groups/theory-of-atoms/

ICMS Geometry Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next session of the Geometry Seminar of ICMS will be held on Wednesday, November 5th, at 14:00, room 403 and via Zoom. A talk entitled Special Linear Systems on Real Algebraic Curves will be delivered by Turgay Akyar (IMI-BAS) More details can be found here: https://icms.bg/special-linear-systems-on-real-algebraic-curves-geometry-seminar-talk-by-turgay-akyar/ Zoom link: https://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1

Atanasoff Memorial Day

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

On November 10, 2025, the Institute of Mathematics and Informatics of the Bulgarian Academy of Sciences will host the Atanasoff Memorial Day event - a new initiative of the Institute of Mathematics and Informatics of the Bulgarian Academy of Sciences and the International Center for Mathematical Sciences (ICMS-Sofia) at the IMI-BAS. The organizers' ambition is to hold the event every year, thus commemorating the memory of John Vincent Atanasoff (1903–1995) - a computer pioneer, inventor of a model of an electronic digital computer and renowned as the "Bulgarian - father of the electronic computer", by marking the intersection of mathematics, computer calculations and complexity sciences - the fields that unite topology, geometry and machine learning in the 21st century and connect Bulgaria's intellectual heritage [...]

Applied Mathematics Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the Applied Mathematics Seminar will be held on November 11, 2025 at 2:00 pm in Room 503 of IMI - BAS. A talk on The number of cycles in a random permutation and the number of segregating sites jointly converge to the Brownian sheet will be delivered by Helmut Pitters (Mannheim, Germany). Abstract: Consider a random permutation of {1, …, ⌊nᵗ²⌋} drawn according to the Ewens measure with parameter t₁, and let K(n, t) denote the number of its cycles, where t ≡ (t₁, t₂) ∈ [0, 1]². Next, consider a sample drawn from a large, neutral population of haploid individuals subject to mutation under the infinitely many sites model of Kimura, whose genealogy is governed by Kingman’s coalescent. Let S(n, t) count the number of segregating sites in [...]

ICMS Geometry Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next session of the Geometry Seminar of ICMS will be held on Wednesday, November 12th, at 14:00, room 403 and via Zoom. A talk entitled Tropical curves with applications will be delivered by Peter Petrov (IMI-BAS) More details can be found here: https://icms.bg/tropical-curves-with-applications-geometry-seminar-talk-by-petar-petrov/ Zoom link: https://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1

ICMS Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

ICMS Seminar Tuesday, 18.11.2025, 13:00 o'clock, room 403 IMI-BAS   Giovane Galindo (ICMS, IMI-BAS) Bundle-type sub-Riemannian structures on holonomy bundles Abstract: In this talk we present the notion of Gromov-Hausdorff distance, a novel field of study that aims to understand the topology of the moduli space of Riemannian metrics on a given manifold. We will then present new results on the subject concerning the collapse of principal bundles onto reductive homogeneous spaces.

Joint meeting of the Seminar on Singularities and the ICMS Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Joint meeting of the Seminar on Singularities and the ICMS Seminar, with a lecture by Pablo Cuadrado. The program is as follows. Tuesday, November 18, room 403, IMI-BAS. 13:00 -- Giovane Galindo (ICMS, IMI-BAS) Bundle-type sub-Riemannian structures on holonomy bundles 14:00 -- Pablo Portilla Cuadrado (Universidad Politécnica de Madrid) The medial axis of the Milnor fiber Abstract (Galindo): In this talk we present the notion of Gromov-Hausdorff distance, a novel field of study that aims to understand the topology of the moduli space of Riemannian metrics on a given manifold. We will then present new results on the subject concerning the collapse of principal bundles onto reductive homogeneous spaces. Abstract (Cuadrado): Let f(x,y) define an isolated singularity at the origin. In this talk we explore a [...]

ICMS Geometry Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next session of the Geometry Seminar of ICMS will be held on Wednesday, November 19th, at 14:00, room 403 and via Zoom. A talk on Tropical curves with applications will be delivered by Peter Petrov (IMI-BAS) More details can be found here: https://icms.bg/tropical-curves-with-applications-geometry-seminar-talk-by-petar-petrov/ Zoom link: https://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1

National Mathematics Colloquium

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

UNION OF BULGARIAN MATHEMATICIANS INSTITUTE OF MATHEMATICS AND INFORMATICS, BULGARIAN ACADEMY OF SCIENCES NATIONAL MATHEMATICS COLLOQUIUM The next meeting of the National Mathematics Colloquium will be held on November 20, 2025 (Wednesday) at 4:15 pm EET (UTC +2) in the Conference Room of IMI - BAS. A talk on: Birkhoff Interpolation Problem: Some Old and New Results will be delivered by Prof. Geno Nikolov, Faculty of Mathematics and Informatics, Sofia University. Abstract. In 1906 George David Birkhoff formulated a general interpolation problem for algebraic polynomials (hereafter called BIP). BIP is defined in terms of incidence matrices and encompasses as particular cases the classical Lagrange and Hermite interpolation problems. In contrast with the classical cases, the general BIP is not always solvable. Despite studied by [...]

Seminar of the Mathematical Modeling and Numerical Analysis Department

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Date and time: November 24, 2025, 2:00 pm Place: Room 503, Institute of Mathematics and Informatics Title: Modelling financial crisis propagation as an epidemic on multiplex networks Lecturer: Dr. Malvina Bozhidarova (Russell Group Limited) Abstrac: We propose a novel framework for modelling the spread of financial crises in complex networks, combining financial data, Extreme Value Theory and an epidemiological transmission model. We accommodate two key aspects of contagion modelling: fundamentals-based contagion, where the transmission is due to direct financial linkages, and pure contagion, where a crisis might trigger additional crises due to global effects. We use stock price, geographical location and economic sector data for a set of companies to construct multiplex networks of four layers, on which a Susceptible-Infected-Recovered transmission model is defined, [...]

ICMS Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Tuesday, November 25-th, 13:00, room 403, IMI-BAS. Deepanshu Prasad (ICMS, IMI-BAS) An Extension of Sato-Kimura Theorem for Semi-invariant rings Abstract:  We give an analog of a result of Sato-Kimura in the context of a semi-invariant  ring for a finite dimensional algebra over an algebraically closed field K of characteristics 0. Then, we examine the case of finite dimensional hereditary algebras over K. This is joint work with Charles Paquette and David Wehlau. https://icms.bg/an-extension-of-sato-kimura-theorem-for-semi-invariant-rings-icms-seminar-talk-by-deepanshu-prasad/

Joint meeting of the ICMS seminar and the seminar on Mathematical Foundations of Informatics

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Wednesday, November 26-th, 16:00, room 403, IMI-BAS Joint meeting of the ICMS seminar and the seminar on Mathematical Foundations of Informatics Frank Vallentin (Universität zu Köln) Least distortion Euclidean embeddings of flat tori Abstract: In the emerging field of bi-Lipschitz invariant theory, one studies embeddings of orbit spaces H/G (H a Hilbert space, G a subgroup of its automorphisms) into simpler Hilbert spaces via distance-preserving maps up to a constant factor. In this talk, I present an infinite-dimensional semidefinite program that computes least-distortion embeddings of flat tori Rn/L, where L is an n-dimensional lattice, into Hilbert spaces. Using symmetry reduction techniques, this infinite-dimensional semidefinite program reduces to an infinite-dimensional linear program. Even with this simplification, solving the program remains challenging. By combining this approach with [...]

National Seminar on Inquiry Based Mathematics Education

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next issue of the National Seminar on Inquiry Based Mathematics Education  will be held on November 29,  2025.The deadline for registration is November 20, 2025.For further iformation please visit the website of the seminar.

Annual Scientific Session of the SofTIS Department

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The annual reporting session of the Department of "Software Technologies and Information Systems" will be held on Tuesday, December 2, in room 278 at 11:00 a.m. PROGRAM

ICMS Seminar and Joint Meeting with the Analysis, Geometry and Topology Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next session of the ICMS seminar will take place on Tuesday, December 2, 2025. Talks will be delivered by Roy Magen from ICMS and Liviu Ornea from the University of Bucharest, with the second talk being presented within a joint session with the seminar of the Analysis, Geometry and Topology Department. The program is as follows. ICMS Seminar and AGT Seminar Tuesday, December 2nd, room 403 IMI-BAS. 13:00 -- Roy Magen (ICMS, IMI-BAS) Flavours of homotopy theory 14:00 -- Liviu Ornea (University of Bucarest) Distinguished non-Kähler metrics on compact complex manifolds Abstract (Magen): In this talk we will consider different flavours of homotopy theory for different types of geometric contexts. First we will recall the usual definitions of the homotopy category, and equivariant [...]

ICMS Geometry Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

It is a great pleasure to announce a talk entitled SL2 tropicalizations through valuation algebra by Andrei Benguş-Lasnier (IMI-BAS) who will speak at the Geometry Seminar of ICMS on next Wednesday (3rd of December) at 14:00 in room 403 and via zoom. More details can be found here: https://icms.bg/sl2-tropicalizations-through-valuation-algebra-geometry-seminar-talk-by-andrei-bengus-lasnier/ Zoom link: https://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1

National Coding Theory workshop “Professor Stefan Dodunekov”

St. Ekaterina Garden Hotel

The National Coding Theory workshop with international participation "Profesor Stefan Dodunekov" will be held from 4th to 7th December 2025 in St. Ekaterina Garden Hotel in the village of Ribaritsa. The scientific program will be held on December 5th and 6th and will include short talks (up to 20 minutes), thesis presentations (up to 40 minutes) and discussions. To participate in the scientific program, please send a title and a short abstract (up to one page) to Peter Boyvalenkov, peter@math.bas.bg, and to Tsonka Baicheva, tsonka@math.bas.bg, before 23.11.2025. The workshop includes the annual reports session of the Mathematical Foundations of Informatics Department, IMI-BAS, too. PROGRAMME

International Conference on Recent Developments in Modern Hodge Theory

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Workshop on Recent Developments in Modern Hodge Theory December 5 - 12, 2025, Room 403 of IMI - BAS This conference will survey some new results in modern Hodge theory and related topics. The conference is organized by ICMS Sofia, IMSA Miami and supported by Simons foundation. For the Programme and further information please visit: https://icms.bg/workshop-recent-developments-in-modern-hodge-theory/ On December 10th and 11th the workshop sessions will be held in Room 256 (Conference Room of IMI - BAS).

Algebra and Logic Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the Algebra and Logic Seminar will take place in hybrid form on December 5, 2025 (Friday) at 1:00 pm (UTC+3) in Room 578 of IMI-BAS and online via Zoom. A talk on: Classical Results in ITL with the Neighbourhood Modalities and Their Short Proofs Using Separation will be delivered by Dimitar Guelev (IMI-BAS). Link to the zoom meeting: Https://us02web.zoom.us/j/85137375021?pwd=RE5QczdFTE1xL1R6MnI2b1lkcGczQT09 Everybody is invited. Algebra and Logic Department, IMI - BAS http://www.math.bas.bg/algebra/seminarAiL/ ============================== =====================

Seminar in Operations Research, Probability and Statistics

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

On December 09, 2025 (Tuesday) at 14:15 in room 503 of IMI-BAS and online via Zoom Dr. Sebastian Tapia Garcia, research unit Variational Analysis, Dynamics and Operations Research, Vienna University of Technology will give a talk at the Operations Research, Probability and Statistics Seminar on: Differentiable functions with surjective generalized Jacobians. Abstract: In this talk we start with a brief discussion about the possible values that the limiting and Clarke Jacobians can take in the class of differentiable locally Lipschitz functions (defined on finite dimensional spaces). Then, we construct a differentiable locally Lipschitz function f:R^n\to R^m such that, for any nonempty compact connected C \subset R^{n х m} , we can find a point x in R^n such that C coincides [...]

Applied Mathematics Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the Applied Mathematics Seminar will be held on December 10 (Wednesday) at 3:00 PM in room 503 of IMI-BAS. Lecturer: Giuseppe D'Onofrio (Politecnico di Torino, Италия) Title: ADDITIVE SUBORDINATION OF MULTIPARAMETER MARKOV PROCESSES Abstract: In this talk, we consider multiparameter multidimensional Markov processes that are time-changed by an independent additive subordinator, obtained from a Lévy process by relaxing the condition of stationary increments. By extending Phillips theorem, we show that the resulting process is a Feller evolution and we characterize its generator. We further derive its pseudo-differential representation and show that its symbol admits a Lévy-Khintchine representation. As an application, we consider a factor-based specification for the Ornstein-Uhlenbeck process subordinated by a Sato process. The constructive nature of this process [...]

International Conference “Early Career Mathematicians in the Balkans” 2025

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

International Conference “Early Career Mathematicians in the Balkans” December 12 - 13, 2025, Sofia The conference is hosted by the International Center for Mathematical Science at IMI-BAS, Sofia, as a forum for early carrier researchers working across the Balkan region. The aim is to provide an opportunity for outstanding young researchers to share knowledge on modern mathematics, with the hope of fostering the creation of lasting research networks in the region, and strengthening the relations between the academic communities. Supported by the Scientific Programme “Enhancing the Research Capacity in Mathematical Sciences (PIKOM)”, No. DO1-67/05.05.2022. PROGRAMME For further information: https://icms.bg/international-conference-early-career-mathematicians-in-the-balkans-2025/

Annual Scientific Session of the Algebra and Logic Department

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The annual Scientific Session of the Department of Algebra and Logic will be held on December 12th (Friday) at 9:45 am in Room 578 of IMI - BAS. Programme 9:45 – 10:00 Opening 10:00 – 10:20 Vesselin Drensky: Dihedral invariants of the free associative algebra of rank two (joint results with Silvia Boumova and Şehmus Fındık). 10:20 – 10:50 Tatiana Gateva-Ivanova: Finite idempotent braided sets and their quadratic algebras 10:50 – 11:00 Break 11:00 – 11:20 Emil Kolev: Covering problems 11:20 – 11:40 Ivan Chipchakov: Application of primary tensor product decompositions to the normality question for locally finite-dimensional central division algebras 11:40 – 11:50 Break 11:50 – 12:10 Veselin Filev: Holographic flavour and neural networks 12:10 – 12:30 Elitza Hristova: Tensor products of Lie [...]

International Conference on Quantum Groups and Cluster Algebras

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The International Center for Mathematical Sciences – Sofia (ICMS-Sofia) hosts an international conference on Quantum Groups and Cluster Algebras between 15-19 December 2025 at the Institute of Mathematics and Informatics, Bulgarian Academy of Sciences. The aim of this conference is to bring together researchers to share recent advances, promote further developments in the theory of Quantum Groups and Cluster Algebras, and to investigate their interactions and applications across mathematics and physics. Quantum groups and cluster algebras both provide frameworks for encoding algebraic and geometric structures arising in representation theory, geometry, and mathematical physics. Quantum groups, as deformations of universal enveloping algebras, capture generalized symmetries with rich categorical and representation-theoretic properties. On the other hand, Cluster algebras, introduced by Fomin and Zelevinsky, appear as important [...]

Singularities Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Time and place: January 12, 2026, Monday, at 2:00 pm, in Room 578, Institute of Mathematics and Informatics - Bulgarian Academy of Sciences Lecturer:  Valdemar Tsanov (IMI-BAS) Title: Geometry of Milnor fibrations of equivariant plane curves Abstract: The local knot of an irreducible C*-equivariant complex plane curve singularity is a torus knot, and the Milnor fiber is a Seifert surface for this knot. I will describe an explicit universal cover of the Milnor fiber by the hyperbolic plane, using automorphic forms for triangle groups. The characteristic morphism of the Milnor fibration can also be recovered, and used to construct geometric structures by universal covers on the knot complement in the 3-sphere, as well as on the complement of the singular curve in the complex plane.

ICMS Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Time and place: Tuesday, January 20th, 2026, 1:00 pm, room 403 IMI-BAS. Lecturer: Bogdan Đorđević (Serbian Academy of Arts and Sciences) Title: Applications of Banach algebras and Banach modules to some contemporary analysis problems Abstract: In recent years applied mathematics has experienced a historical progress, blurring the lines between the previously clear research paths and directions. Accordingly, contemporary mathematical analysis is at the verge of unifying seemingly different research areas and topics. With this in mind, I'd like to talk about my humble contribution to this cause: my lecture will concern how Banach algebras and modules, combined with spectral theory, functional calculus, and generalized inverses, help in various problems that emerge in applied mathematics in general: from solving operator and matrix equations, to evaluating sums [...]

ICMS Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Time and place: Tuesday, January 27th, 2026, 1:00 pm, room 403 IMI-BAS. Lecturer: Jean-Pierre Gazeau (Université Paris Cité, CNRS, and University of Białystok) Title: Spectral and angular variables for open qudit dynamics Abstract:  In this talk, I introduce a parametrization of finite-dimensional quantum states that is particularly adapted to the study of open qudit dynamics. Any generic density matrix in Cn can be described by separating spectral variables, which encode the eigenvalue content, from angular variables associated with the unitary degrees of freedom. These angular variables naturally live on the coset space SU(n)/T, in the spirit of the Tilma–Sudarshan construction. A key outcome of this parametrization is a partial decoupling of the GKLS evolution: while the angular variables are driven by both the Hamiltonian and [...]

ICMS Geometry Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The postponed talk entitled Tropical curves with applications by Peter Petrov (IMI-BAS) will be delivered at the Geometry Seminar of ICMS on Wednesday (25th of February) at 2:00 pm (GMT+2) in room 403 and via zoom. More details can be found here: https://icms.bg/tropical-curves-with-applications-geometry-seminar-talk-by-petar-petrov-2/ Zoom link: https://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1

ICMS Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Two lectures by Milen Yakimov, chair of the group on Cluster Algebras and Quantum Groups at the ICMS, IMI-BAS. Tuesday, March 10, at 13:00 in room 403, IMI-BAS. Cluster structures on quantum groups and the full Berenstein-Zelevinsky conjecture Tuesday, March 17, at 13:00 in room 403, IMI-BAS. Reflective centres of module categories and quantum K-matrices Abstracts: March 10: Cluster Algebras were invented by Fomin and Zelevinsky in the early 2000s and quickly turned into an indispensable tool in many areas of mathematics. In this talk, we will provide a gentle introduction to the subject. From the early days of the theory of cluster algebras, one of the desired constructions was to turn the quantized coordinate rings of complex simple Lie groups into quantum cluster algebras. [...]

ICMS Geometry Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The talk entitled Algebraic Curves and Brill–Noether Theory by Turgay Akyar (IMI-BAS) will be delivered at the Geometry Seminar of ICMS on Wednesday (11th of March) at 2:00 pm (GMT+2) in room 278 and via zoom. More details can be found here: https://icms.bg/algebraic-curves-and-brill-noether-theory-geometry-seminar-talk-by-turgay-akyar/ Zoom link: https://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1

ICMS Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Two lectures by Milen Yakimov, chair of the group on Cluster Algebras and Quantum Groups at the ICMS, IMI-BAS. Tuesday, March 10, at 13:00 in room 403, IMI-BAS. Cluster structures on quantum groups and the full Berenstein-Zelevinsky conjecture Tuesday, March 17, at 13:00 in room 403, IMI-BAS. Reflective centres of module categories and quantum K-matrices Abstracts: March 10: Cluster Algebras were invented by Fomin and Zelevinsky in the early 2000s and quickly turned into an indispensable tool in many areas of mathematics. In this talk, we will provide a gentle introduction to the subject. From the early days of the theory of cluster algebras, one of the desired constructions was to turn the quantized coordinate rings of complex simple Lie groups into quantum cluster algebras. [...]

ICMS Geometry Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Next session of the Geometry Seminar of ICMS is scheduled for the next Wednesday, March 18, 14:00, room 403 (and via Zoom). Sneha Chaubey (Indraprastha Institute of Information Technology) will give a talk titled Distribution and Correlation of Polynomial Farey Fractions More details can be found here: https://icms.bg/distribution-and-correlation-of-polynomial-farey-fractions-geometry-seminar-talk-by-sneha-chaubey/ https://icms.bg/distribution-and-correlation-of-polynomial-farey-fractions-geometry-seminar-talk-by-sneha-chaubey/ Zoom link: https://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1

Sofia One Board Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Next talk: Frieze Patterns Date: Thursday, 19 March 2026, 2:00 - 3:00 pm. Room: 478 Speaker: Deepanshu Prasad Abstract: Frieze patterns, introduced by H. S. M. Coxeter and John Conway, are arrays of numbers satisfying a simple local determinant rule. Despite their elementary definition, they have deep connections with combinatorics, cluster algebras, and representation theory. In this talk, I will briefly review classical frieze patterns and then discuss infinite friezes. I will describe their basic properties and illustrate how they arise naturally in combinatorial and representation-theoretic settings. Organizers: Christelle Kozaily Higinio Serrano Garcia For more information: https://sites.google.com/view/one-board-seminar-sofia/inicio,  oneseminarinsofia@gmail.com This seminar is organized for early-career researchers from IMI, ICMS and the faculty. This would be a great opportunity for young researchers to meet and exchange ideas in an [...]

Didactical Modeling Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the seminar Didactical Modeling will be held on March 23, 2026, at 2:30 pm in Room 278 of IMI – BAS. A talk on: Analysis of the results of the Regional Round of the National Mathematical Olympiad of 4th - 7th Grae in 2026 will be delivered by Nevena Sabeva and Boyanka Savova.

ICMS Geometry Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The second talk by Turgay Akyar (IMI-BAS) who will continue speaking about Algebraic Curves and Brill–Noether Theory. will be delivered on Wednesday, March 25, 14:00 in room 578, and via Zoom. More details can be found on the website: https://icms.bg/algebraic-curves-and-brill-noether-theory-geometry-seminar-talk-by-turgay-akyar-2/ Zoom link: https://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1

Sofia One Board Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Next talk: How playing a game gives you the largest collection of numbers (Hackenbush) Date: Thursday, 26 March 2026, 2:00 - 3:00 pm. Room: 278 Speaker: Aldayr de Jesús Silva Contreras Abstract: John H. Conway was one of the most free-spirited mathematicians of all time. A testament to this can be seen throughout his works and through some funny anecdotes about him told by his peers and students. In particular, this can be felt by going through his collection of books titled Winning Ways for your mathematical plays. In this one board seminar, I will discuss one particular game described in the first volume of this collection of books and how this led him to the discovery of the largest collection of numbers, and I [...]

Seminar of the SofTIS Department

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

You are welcome to join the Scientific seminar of the Dept. Software Technologies and Information Systems on 31st March 2026, Tuesday, from 14.00 (UTC+02). The seminar will be in hybrid format: in 278 hall in the building of IMI-BAS and via ZOOM.  Assist.  Ventsislav Polimenov will give a talk, entitled: "ANNSIA - Adaptive Neural Network for Satellite Image Analysis". The talk will show an innovative approach to leaf area index estimation using a multi-sensor deep neural network that combines Sentinel-2 and Landsat 8/9 data. The study addresses two primary challenges, namely the absence of in-situ data for training and the substantial differences in spatial and spectral characteristics between the sensors. The model employs a Multi-Sensor U-Net with Conditional Batch Normalisation, enabling unified processing of heterogeneous [...]

Algebra and Logic Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the Algebra and Logic Seminar will take place on April 3, 2026 (Friday) at 1:00 pm (UTC+3) in online format via Zoom. A talk on: On Pairs of Non-commuting Hermitian Operators on the Unitary Plane which are Permutable Measurements will be delivered by Valentin Iliev (IMI-BAS). Abstract. In this presentation we study observables with spectre {-1,1} on quantum systems with the unitary plane as a space of states. Examples of such quantum systems are spin-1/2 particles. We find necessary and sufficient conditions for two non-commuting observables to be permutable measurements, that is, the probability of obtaining a particular pair of results does not depend on the order of taking these measurements. Several examples are presented. Link to the zoom meeting: https://us02web.zoom.us/j/88300991142?pwd=wGYl7VaD9RZKEm99sKzHMzl3bYCv3J.1 [...]

Optimization Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

On April 6, 2026 (Monday) at 2:15 p.m. in Room 478 of IMI-BAS, a joint meeting of The Seminar on Optimization (PMI) and the Seminar on Operations Research (IMI) will be held. A talk on Hausdorff characterizations of first countable T1 spaces via fixed point theorems will be delivered by Detelina Kamburova. Everybody is invited.

ICMS Geometry Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

A talk on Phase Tropical hypersurfaces and their cousins will be delivered by Ilia Zharkov (KSU) on Wednesday, April 15, 14:00 in room 403, and via Zoom. More details can be found on the website: https://icms.bg/phase-tropical-hypersurfaces-and-their-cousins-geometry-seminar-talk-by-ilia-zharkov/ Zoom link: https://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1

National Seminar on Probability and Statistics

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the National Seminar on Probability and Statistics will be held on April 21, 2026, at 2:00 p.m. in Room 503 of the Institute of Mathematics and Informatics. A talk on: How long does it take to train an Elephant Random Walk will be delivered by Zheng Fang (University of Zurich). Abstract: We study how conditioning on the first k steps, which we think of as training, affects the long-term behavior of the Elephant Random Walk. When the elephant is conditioned to be at position k at time k , the first return time to the origin scales as k^{(4−4p)⁄(3−4p)} in the diffusive regime, and grows exponentially in the critical regime. We loosely interpret this as a measurement of [...]

Algebra and Logic Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the Algebra and Logic Seminar will take place on April 24, 2026 (Friday) at 1:00 pm (UTC+3) in Room 578 and online via Zoom. A talk on: Sets preserved by a large subgroup of the special linear group will be delivered by Kaloyan Slavov (Medical University, Sofia). Abstract. The classical Kakeya problem in Euclidean space asks how “small” a set can be if it contains a unit line segment in every direction. More generally, packing sets contain all images of a given set under a collection of transformations. Finite field analogues offer a combinatorial and algebraic perspective and motivate our work. We study sets E in the affine plane over a finite field that are invariant under a large subgroup R [...]

Preliminary Defense of Ventsislav Polimenov, SofTIS Department

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

On April 24, 2026 (Friday), at 2:00 pm, in the Conference Room of IMI-BAS (Room 256) and via ZOOM, a preliminary defense will be held of the dissertation on Adaptive neural network for processing satellite data with different spatial and spectral characteristics by Ventsislav Polimenov, doctoral student at the Software Technologies and Information Systems section, with scientific supervisor Assoc. Prof. Krasimira Ivanova, for obtaining the educational and qualification degree Doctor of Philosophy in the higher education area 4. Natural Sciences, Mathematics and Informatics, professional field 4.6 Informatics and Computer Science. * The dissertation materials are available in the IMI library. * Zoom link: https://us02web.zoom.us/j/88606059983?pwd=rsE8lZaDFuRmGpaaIuUIPRErEV6dJM.1

Seminar in Operations Research, Probability and Statistics

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

On April 28, 2026 (Tuesday) at 2:00 pm in room 503 of IMI-BAS Mihail Mukov (Intellics Engineering) will give a talk at the Operations Research, Probability and Statistics Seminar on: Modeling Lifting Systems in Waste Collection . Abstract: This presentation considers the problem of estimating the mass of waste emptied from individual containers by a garbage truck equipped with standard lifting forks for both large 1100-liter containers and smaller waste bins. The main objective is to develop a low-cost measurement system that can be applied to a wide range of truck configurations with only minimal hardware modification. The system combines an oil pressure sensor installed in the hydraulic circuit and a standard smartphone inertial measurement unit fixed on the lifting arm. The pressure sensor [...]

Seminar of the SofTIS Department

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

We kindly invite you to the seminar of the Software Technologies and Information Systems Dept. at IMI-BAS, which will take place on April 28, Tuesday, at 2:00 p.m. in Hall 278 at IMI-Sofia and online. Our guest lecturer Desislava Vasileva will present a research overview on Adaptive Educational Software and Game-Based Learning. She will talk on adaptive educational software and game-based learning, covering three interconnected research lines. The first concerns adaptive hypermedia and e-learning systems, including formal learner modeling and a platform for adaptive content delivery. The second focuses on game-based learning and player modeling — playing style classification from behavioral data, physiological affect detection via galvanic skin response, and a platform for automated generation of adaptive 3D educational games. The third extends this work to [...]

National Seminar on Probability and Statistics

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the National Seminar on Probability and Statistics will be held on April 29, 2026, at 2:00 p.m. in Room 503 of the Institute of Mathematics and Informatics. A talk on: Progressively Type-II censored competing risks data from Odd Lindley Half-Logistic distribution will be delivered by Stevo Gjorgiev (Ss. Cyril and Methodius University in Skopje). Abstract: A competing risks model based on the Odd Lindley Half Logistic distribution is considered under progressive Type II censoring. Maximum likelihood estimates for the distribution parameters are obtained, and the existence and uniqueness of these estimates are proven. The EM algorithm is applied to solve the log- likelihood equations and construct the s-th EM sequence. Additionally, using the missing information principle, the observed and expected [...]

Mathematical Foundations of Informatics Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the Mathematical Foundations of Informatics seminar will be held on May 12, 2026, at 1 p.m. in Room 503 of the Institute of Mathematics and Informatics. A talk on: Linear codes and Steiner triple systems will be delivered by Vladimir D. Tonchev Michigan Technological University, Houghton, USA. The abstract can be found here.

Mathematical Foundations of Informatics Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the seminar of the department of Mathematical Foundations of Informatics will be held on Tuesday, May 12, 2026, at 1:00 pm, in Room 503 of IMI-BAS. A talk on Linear codes and Steiner triple systems will be delivered by prof. Vladimir Tonchev (Michigan Technological University). Abstract

ICMS Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Time and place: Tuesday, May 12-th, 13:00, room 403 IMI-BAS. Lecturer: Ina Petkova (Darmouth College) Title: Khovanov homology and Lagrangian cobordisms Abstract: We provide a partial answer to a question of Ekholm, Honda, and Kalman about the relationship between Khovanov homology and decomposable Lagrangian cobordisms. We also utilize previously defined filtered invariants to give a family of obstructions to decomposable Lagrangian cobordisms from Khovanov homology. Joint with Gage Martin and Zachary Winkeler. More information can be found on the seminar's web-page: https://icms.bg/khovanov-homology-and-lagrangian-cobordisms-icms-seminar-talk-by-ina-petkova/ https://icms.bg/category/icms-seminar/

National Seminar on Probability and Statistics

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the National Seminar on Probability and Statistics will be held on May 12, 2026, at 2:00 p.m. in Room 503 of the Institute of Mathematics and Informatics. A talk on: Random Flights and Anomalous Diffusion: A non-Markovian Take on Lorentz Processes will be delivered by Lorenzo Facciaroni (Sapienza University of Rome). Abstract: A Lorentz process is a model for the motion of a particle among randomly located scatterers, also known as obstacles. It was originally used to describe the transport of electrons through a conductor. In the classical setting, when the scatterers are distributed according to a Poisson point process, the deterministic dynamics of elastic collisions can be approximated, under the Boltzmann-Grad scaling limit, by a Markovian random flight. The [...]

National Seminar on Probability and Statistics

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the National Seminar on Probability and Statistics will be held on May 13, 2026, at 2:00 p.m. in Room 503 of the Institute of Mathematics and Informatics. A talk on: Some Properties of Exponential Functionals of Continuous Gaussian Processes will be delivered by José Alfredo López-Mimbela (Center for Research in Mathematics Guanajuato, Mexico). Abstract: Exponential functionals of random processes are mathematical expressions that typically involve integrating the exponential of a random process over time. These functionals play a significant role in various areas of mathematics and applied sciences, including probability theory, statistical mechanics, and financial mathematics. In this talk, we discuss some properties of exponential functionals associated with continuous Gaussian processes. The discussion centers on obtaining useful bounds for their [...]

International Conference Celebrating Women in Representation Theory

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The International Center for Mathematical Sciences – Sofia (ICMS-Sofia) hosts an international conference which aims to celebrate the contributions of female mathematicians working in representation theory and adjacent areas. This conference will provide a platform for researchers from across the field to present their work, foster new collaborations, and strengthen connections within the community. The conference also seeks to promote visibility and support for women in mathematics. Attendance is open to everyone, please register on the website. We welcome and encourage participation from all fields of mathematics, all career stages. Programme and more on https://icms.bg/celebrating-women-in-representation-theory/

ICMS Distinguished Lecture Series in Representation Theory and Mathematical Physics – Gordana Todorov, Lecture 1

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

ICMS Distinguished Lecture series in Representation Theory and Mathematical Physics Date and place: May 18 to May 22, 2026 (16:00–17:00 Sofia time) , Room 403, IMI - BAS Lecturer: Gordana Todorov (Northeastern University), Boston, USA Title: Algebras and Categories The five lectures cover: (1) quiver representations, Gabriel, Dlab, Ringel — Dynkin diagrams, Auslander–Reiten theory; (2) cluster algebras and cluster categories; (3) higher Auslander algebras and cluster tilting subcategories; (4) preprojective algebras and higher preprojective algebras; (5) preprojective structure on subcategories. https://icms.bg/event/algebras-and-categories-gordana-todorov-lecture-series/

Digital Culture Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the Digital Culture Seminar will be held on May 19, 2026 (Tuesday) at 10:00 a.m. in Room 256 of IMI - BAS. A talk on: Competing Conceptions of AGI will be delivered by Pei Wang (Temple University, USA), Edior-in-Chief of the Journal of Artificial General Intelligence. Abstract: While the term "Artificial General Intelligence" (AGI) has been used to identify a research field for 20 years, a consensus on its goal remains controversial. These divergent interpretations are not merely philosophical, as they lead to fundamentally different research agendas and engineering methodologies. In this talk, the NARS (Non-Axiomatic Reasoning System) project is introduced, with an outline of its assumptions, representations, inference rules, and working process. NARS offers a fundamentally different vision of [...]

ICMS Distinguished Lecture series in Representation Theory and Mathematical Physics – Ivan Dimitrov, Lecture 1

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

ICMS Distinguished Lecture series in Representation Theory and Mathematical Physics Date and place: May 19 and 21, 2026 (15:00–16:00 Sofia time) and June 1, 3 and 5, 2026 (16:00–17:00 Sofia time), Room 403, IMI - BAS Lecturer: Ivan Dimitrov (Queen’s University, Canada) Title: Root systems, generalizations and applications Root systems were introduced by Wilhelm Killing in 1889 as a tool for classifying Lie algebras. Since then, they have become ubiquitous, appearing in various contexts in seemingly unrelated areas of Mathematics. In this lecture series, Ivan Dimitrov introduces and studies root systems and defines a generalization of root systems. He explains how this more general structure applies to various problems, e.g. hyperplane arrangements. Finally, he introduces and studies inversion sets of roots. The exposition is [...]

ICMS Distinguished Lecture Series in Representation Theory and Mathematical Physics – Gordana Todorov, Lecture 2

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

ICMS Distinguished Lecture series in Representation Theory and Mathematical Physics Date and place: May 18 to May 22, 2026 (16:00–17:00 Sofia time) , Room 403, IMI - BAS Lecturer: Gordana Todorov (Northeastern University), Boston, USA Title: Algebras and Categories The five lectures cover: (1) quiver representations, Gabriel, Dlab, Ringel — Dynkin diagrams, Auslander–Reiten theory; (2) cluster algebras and cluster categories; (3) higher Auslander algebras and cluster tilting subcategories; (4) preprojective algebras and higher preprojective algebras; (5) preprojective structure on subcategories. https://icms.bg/event/algebras-and-categories-gordana-todorov-lecture-series/

First International Conference “Responsible Creation of Artificial General Intelligence”

Университетски център „Бачиново“ - Благоевград 42°01'59.6"N 23°07'46.6"E, Благоевград

The Institute of Mathematics and Informatics is pleased to announce RC-AGI 2026. This is an international conference jointly organized by our institute and the South-West University “Neofit Rilski”. Conference objectives: Mankind is on the verge of its most important discovery, one that will fundamentally change our life and future. The creation of AGI is similar to letting the genie out of the bottle. In fairy tales there is usually only one bottle and the question is whether to open it or not. With AGI the opening the bottle is inevitable because many researchers and international companies are working on its creation and no one can stop or prohibit them from creating it. Furthermore, when we are about to let the AGI genie out of [...]

National Seminar on Probability and Statistics

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the National Seminar on Probability and Statistics will be held on May 20, 2026, at 2:00 p.m. in Room 503 of the Institute of Mathematics and Informatics. A talk on: Finite time blowup and existence of global solutions of a semi-linear stochastic partial differential equation with fractional noise will be delivered by Ekaterina Todorova Kolkovska (Center for Research in Mathematics Guanajuato, Mexico). Abstract: We consider a stochastic partial differential equation driven by fractional Brownian motion with Hurst parameter H greater or equal to 1/2 on a bounded domain with smooth boundary and Dirichlet boundary conditions. By means of an associated random partial differential equation, lower and upper bounds for the blowup time of the solution are given. Sufficient conditions for [...]

ICMS Distinguished Lecture Series in Representation Theory and Mathematical Physics – Gordana Todorov, Lecture 3

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

ICMS Distinguished Lecture series in Representation Theory and Mathematical Physics Date and place: May 18 to May 22, 2026 (16:00–17:00 Sofia time) , Room 403, IMI - BAS Lecturer: Gordana Todorov (Northeastern University), Boston, USA Title: Algebras and Categories The five lectures cover: (1) quiver representations, Gabriel, Dlab, Ringel — Dynkin diagrams, Auslander–Reiten theory; (2) cluster algebras and cluster categories; (3) higher Auslander algebras and cluster tilting subcategories; (4) preprojective algebras and higher preprojective algebras; (5) preprojective structure on subcategories. https://icms.bg/event/algebras-and-categories-gordana-todorov-lecture-series/

National Mathematics Colloquium

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

UNION OF BULGARIAN MATHEMATICIANS INSTITUTE OF MATHEMATICS AND INFORMATICS, BULGARIAN ACADEMY OF SCIENCES NATIONAL MATHEMATICS COLLOQUIUM The next meeting of the National Mathematics Colloquium will be held on May 20, 2026 (Wednesday) at 4:15 pm EET (UTC +2) in the Conference Room of IMI - BAS. A talk on: Geometry of Twistor Spaces will be delivered by Prof. Gueo Grantcharov, Institute of Mathematics and Informatics, Bulgarian Academy of Sciences.   Everybody is invited.  

ICMS Distinguished Lecture series in Representation Theory and Mathematical Physics – Ivan Dimitrov, Lecture 2

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

ICMS Distinguished Lecture series in Representation Theory and Mathematical Physics Date and place: May 19 and 21, 2026 (15:00–16:00 Sofia time) and June 1, 3 and 5, 2026 (16:00–17:00 Sofia time), Room 403, IMI - BAS Lecturer: Ivan Dimitrov (Queen’s University, Canada) Title: Root systems, generalizations and applications Root systems were introduced by Wilhelm Killing in 1889 as a tool for classifying Lie algebras. Since then, they have become ubiquitous, appearing in various contexts in seemingly unrelated areas of Mathematics. In this lecture series, Ivan Dimitrov introduces and studies root systems and defines a generalization of root systems. He explains how this more general structure applies to various problems, e.g. hyperplane arrangements. Finally, he introduces and studies inversion sets of roots. The exposition is [...]

ICMS Distinguished Lecture Series in Representation Theory and Mathematical Physics – Gordana Todorov, Lecture 4

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

ICMS Distinguished Lecture series in Representation Theory and Mathematical Physics Date and place: May 18 to May 22, 2026 (16:00–17:00 Sofia time) , Room 403, IMI - BAS Lecturer: Gordana Todorov (Northeastern University), Boston, USA Title: Algebras and Categories The five lectures cover: (1) quiver representations, Gabriel, Dlab, Ringel — Dynkin diagrams, Auslander–Reiten theory; (2) cluster algebras and cluster categories; (3) higher Auslander algebras and cluster tilting subcategories; (4) preprojective algebras and higher preprojective algebras; (5) preprojective structure on subcategories. https://icms.bg/event/algebras-and-categories-gordana-todorov-lecture-series/

ICMS Distinguished Lecture Series in Representation Theory and Mathematical Physics – Gordana Todorov, Lecture 5

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

ICMS Distinguished Lecture series in Representation Theory and Mathematical Physics Date and place: May 18 to May 22, 2026 (16:00–17:00 Sofia time) , Room 403, IMI - BAS Lecturer: Gordana Todorov (Northeastern University), Boston, USA Title: Algebras and Categories The five lectures cover: (1) quiver representations, Gabriel, Dlab, Ringel — Dynkin diagrams, Auslander–Reiten theory; (2) cluster algebras and cluster categories; (3) higher Auslander algebras and cluster tilting subcategories; (4) preprojective algebras and higher preprojective algebras; (5) preprojective structure on subcategories. https://icms.bg/event/algebras-and-categories-gordana-todorov-lecture-series/

International Conference on Mathematical Quantum Field Theory

Bulgarian Academy of Sciences 1, 15th November Str., Sofia, Sofia City

Mathematical Quantum Field Theory International conference in memory of Ivan Todorov Start date: 26 May 2026 End date: 30 May 2026 Event location: Hall “Prof. Marin Drinov”, BAS, Sofia, Bulgaria Organized by the Institute for Nuclear Research and Nuclear Energy (INRNE) and the International Center for Mathematical Sciences at the Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences The conference encompasses a wide range of modern topics at the intersection of physics and mathematics, including conformal field theory, vertex operator algebras, integrable systems, supersymmetry, gauge theory, gravity, cosmology, quantum information, and the mathematical structures that connect them. Ivan Todorov (1933-2024) was a leading Bulgarian theoretical physicist whose contributions to mathematical physics, conformal field theory, and the algebraic approach to quantum field theory shaped generations of researchers. He spent his [...]

Digital Culture Seminar

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

The next meeting of the Digital Culture Seminar will be held on May 26, 2026 (Tuesday) at 10:00 a.m. in Room 278 of IMI - BAS. A talk on: Logics for Strategic Reasoning about Socially Interacting Rational Agents will be delivered by Valentin Goranko, Stockholm University, Sweden. Abstract: An important aspect of socially interacting rational agents are the strategic abilities of individual agents and groups (coalitions) of agents to guarantee the achievement of their desired goals, while acting and interacting within an entire society of agents. Several logical systems have been proposed for formalising and capturing such reasoning were introduced the early 2000s, starting with the Coalition Logic (CL), the Alternating Time Temporal Logic (ATL), and some extensions of these. Coalition Logic provides a natural, [...]

Seminar in Operations Research, Probability and Statistics of IMI-BAS and Optimization Seminar of FMI-SU

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

On June 1st, 2026 (Monday) at 2:15 pm in room 503 of IMI-BAS a joint meeting will be held of the Operations Research, Probability and Statistics Seminar of IMI-BAS and the Optimization Seminar of the Faculty of Mathematics and Informatics, Sofia University. A talk on: On the subregularity of mappings associated to optimization problems will be delivered by Alberto Dominguez Corella, University of Graz, Austria. Abstract: This talk is meant as a nontechnical discussion on the concept of metric subregularity and its application to the study of stability in optimization problems. It features equivalences between the property and local error bounds, as well as theoretical applications, e.g., discretization, approximation, and differentiation with respect to parameters. We describe several concrete applications, including inverse problems and optimal control. [...]

ICMS Distinguished Lecture Series in Representation Theory and Mathematical Physics – Ivan Dimitrov, Lecture 3

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

ICMS Distinguished Lecture series in Representation Theory and Mathematical Physics Date and place: May 19 and 21, 2026 (15:00–16:00 Sofia time) and June 1, 3 and 5, 2026 (16:00–17:00 Sofia time), Room 403, IMI - BAS Lecturer: Ivan Dimitrov (Queen’s University, Canada) Title: Root systems, generalizations and applications Root systems were introduced by Wilhelm Killing in 1889 as a tool for classifying Lie algebras. Since then, they have become ubiquitous, appearing in various contexts in seemingly unrelated areas of Mathematics. In this lecture series, Ivan Dimitrov introduces and studies root systems and defines a generalization of root systems. He explains how this more general structure applies to various problems, e.g. hyperplane arrangements. Finally, he introduces and studies inversion sets of roots. The exposition is [...]

Joint seminar of ICMS and AGT

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

Date and time: Tuesday, June 2-nd, 2026, 13:00, room 403 IMI-BAS Lecturer: Bogdan Djordjevic, (Serbian Academy of Arts and Sciences, visitor at ICMS, IMI-BAS) Title: Application of the Laplace transform for evaluating sums of hyperharmonic-like series in Banach algebras and modules Abstract: In this talk it will be shown how the Laplace transform (in respective Banach spaces) can be utilized for evaluating sums of Banach-space-valued series. We demonstrate the technique on various abstract generalizations of the numerical hyperharmonic series, including noncommutative setting and non-invertible setting. As an application, we obtain new necessary consistency condition for the Sylvester equation ax-xb=c[\latex].

ICMS Distinguished Lecture Series in Representation Theory and Mathematical Physics – Ivan Dimitrov, Lecture 4

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

ICMS Distinguished Lecture series in Representation Theory and Mathematical Physics Date and place: May 19 and 21, 2026 (15:00–16:00 Sofia time) and June 1, 3 and 5, 2026 (16:00–17:00 Sofia time), Room 403, IMI - BAS Lecturer: Ivan Dimitrov (Queen’s University, Canada) Title: Root systems, generalizations and applications Root systems were introduced by Wilhelm Killing in 1889 as a tool for classifying Lie algebras. Since then, they have become ubiquitous, appearing in various contexts in seemingly unrelated areas of Mathematics. In this lecture series, Ivan Dimitrov introduces and studies root systems and defines a generalization of root systems. He explains how this more general structure applies to various problems, e.g. hyperplane arrangements. Finally, he introduces and studies inversion sets of roots. The exposition is [...]

ICMS Distinguished Lecture Series in Representation Theory and Mathematical Physics – Ivan Dimitrov, Lecture 5

Institute of Mathematics and Informatics, BAS Akad.G.Bonchev St, bl. 8, 1113, Sofia

ICMS Distinguished Lecture series in Representation Theory and Mathematical Physics Date and place: May 19 and 21, 2026 (15:00–16:00 Sofia time) and June 1, 3 and 5, 2026 (16:00–17:00 Sofia time), Room 403, IMI - BAS Lecturer: Ivan Dimitrov (Queen’s University, Canada) Title: Root systems, generalizations and applications Root systems were introduced by Wilhelm Killing in 1889 as a tool for classifying Lie algebras. Since then, they have become ubiquitous, appearing in various contexts in seemingly unrelated areas of Mathematics. In this lecture series, Ivan Dimitrov introduces and studies root systems and defines a generalization of root systems. He explains how this more general structure applies to various problems, e.g. hyperplane arrangements. Finally, he introduces and studies inversion sets of roots. The exposition is [...]

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