FacebookTwitter

Events Search and Views Navigation

Event Views Navigation

Today

Geometry Seminar of ICMS

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, December 4, 2024, at 4:00 pm, in room 403 and via Zoom. A talk on: Tropical compactifications of moduli spaces - Part 2 will be delivered by Lionel Lanf, International Center of Mathematical Sciences (ICMS - Sofia). Abstract:In this talk I will describe various tropical compactifications of the moduli spaces of curves. I will discuss some motivations and applications coming from tropical geometry (joint with M. Melo, J. Rau and F. Viviani). Zoom link: https://us02web.zoom.us/j/83740034721?pwd=VnBtcVpGUktscHQ4a09jZkNZTURyZz09  

Annual Scientific Session of Analysis, Geometry and Topology Department

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

The Annual Scientific Session of the Analysis, Geometry and Topology Department will be held on December 5, 2024 (Thursday) at 12:00 pm in Room 478 of IMI - BAS. ПРОГРАМА

Inaugural lecture of Prof. Emilia Bazhlekova

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

On December 5, 2024, at 3:30 pm in Room 478 of IMI - BAS, as part of the seminar of the Analysis, Geometry and Topolofy Department, Prof. Emilia Bazhlekova will deliver an inaugural lecture on: Applications of fractional calculus in modelling processes with memory

International Conference Unexpected Phenomena in Energy Minimization and Polarization (UP24)

Hyatt Regency Sofia Hotel Площад "Васил Левски", София

International Conference Unexpected Phenomena in Energy Minimization and Polarization (UP24) December 9-13, 2024 Sofia, Bulgaria Hyatt Regency Sofia Hotel Organizers: Dmitriy Bilyk, University of Minnesota, US Peter Grabner, Technische Universität Graz, Austria Edward Saff, Vanderbilt University, US Maya Stoyanova, Sofia University, Bulgaria Local organizer: Peter Boyvalenkov (Institute of Mathematics and Informatics, BAS)

Annual Scientific Report Session

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

The Annual Scientific Session of the ICMS researchers will be held on December 9, 2024, at 1:00 pm in Room 403 of IMI - BAS. PROGRAM

ICMS-Sofia: Fifth International Conference Women in Mathematics in South-Eastern Europe

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

The International Center for Mathematical Sciences – Sofia (ICMS-Sofia) at the Institute of Mathematics and Informatics, Bulgarian Academy of Sciences is organizing the Fifth International Conference Women in Mathematics in South-Eastern Europe, which will be held on December 11 – 13, 2024, in Sofia, Bulgaria. The international conference is held with the support of the Scientific Program "Enhancing the Research Capacity in Mathematical Sciences" and the Simons Foundation. You can find more about the event, the speakers, as well as abstracts of the reports on the ICMS–Sofia website: https://icms.bg/fifth-conference-women-in-mathematics-in-south-eastern-europe/.

Annual Scientific Session of the Department of Algebra and Logic

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 take place on December 13 from 9:55 in room 578.   PROGRAM (Updated) 9:55 – 10:00 Opening 10:00 – 10:30 Vesselin Drensky and Boyan Kostadinov: On central polynomials of 4 × 4 matrices 10:30 – 10:50 Jörg Koppitz: On endomorphism monoids of the star graph 10:50 – 11:00 Break 11:00 – 11:20 Vassil Kanev: Hurwitz moduli varieties parameterizing pointed covers of an algebraic curve with a fixed monodromy group 11:20 – 11:40 Hristo Iliev: Curves on cones and their Tschirnhausen modules 11:40 – 11:50 Break 11:50 – 12:10 Petar Iliev: Modal logic with bi-implication is exponentially more succinct on BT and S4 models 12:10 – 12:30 Dimiter Dobrev: Initiative for Responsible Approach [...]

Mathematical Foundations of Informatics Seminar

Veliko Tarnovo University 2, Teodosiy Tarnovski Str., Veliko Tarnovo

The seminar on MATHEMATICAL FOUNDATIONS OF COMPUTER SCIENCE organized by the Department of Mathematical Foundations of Informatics at IMI - BAS and the Faculty of Mathematics and Informatics of Veliko Tarnovo University (VTU), would like to invite you to the next meeting on January 8, 2025 at 5:00 p.m. in room 401 of building 4 of VTU. Prof. Ferruh Özbudak Sabancı University Faculty of Engineering and Natural Sciences, İstanbul - Turkiye will deliver a talk on: Generalizing the Bierbrauer—Friedman bound to mixed-level orthogonal arrays (joint work with Denis Krotov and Vladimir Potapov) Abstract: We characterize mixed-level orthogonal arrays it terms of algebraic designs in a special multigraph. We prove a mixed-level analog of the Bierbrauer--Friedman (BF) bound for pure-level orthogonal arrays and show that [...]

ICMS Seminar

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

Time: January 14, 2025, 2:00 pm Place: Room 403, IMI - BAS Speaker: Jean-Pierre Gazeau, Université Paris-Cité Title: Regularized Quantum Motion in a Bounded Set: Hilbertian Aspects Further information: https://icms.bg/regularized-quantum-motion-in-a-bounded-set-hilbertian-aspects-talk-by-jean-pierre-gazeau/ Abstract. It is well known that the momentum operator canonically conjugated to the position operator for a particle confined within a bounded interval of the line (with Dirichlet boundary conditions) is not essentially self-adjoint, as it possesses a continuum of self-adjoint extensions. In this talk, we demonstrate that essential self-adjointness can be restored by symmetrically weighting the momentum operator with a positive bounded function that approximates the indicator function of the given interval. This weighted momentum operator arises naturally from a similarly weighted classical momentum through the Weyl-Heisenberg covariant integral quantization of functions or distributions. Reference: [...]

Inaugural lecture by Prof. Hristo Kostadinov

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

On January 16, 2025 (Thursday) from 2:00 p.m. in the Meeting Hall of IMI-BAN prof. Hristo Kostadinov will deliver an inaugural lecture on: Construction and applications of integer codes

General Meeting of the Scientists at IMI and the Scientific Council of IMI

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

Pursuant to item 4.2 of the Operational Regulations of IMI, a joint meeting of the General Meeting of the Scientists at IMI and the Scientific Council of IMI will be held on January 22, 2025 (Wednesday) at 11:00 a.m. in Room 055 "Acad. Stefan Dodunekov", floor -1 of IMI, with the following agenda: 1.Election of the chairman of the General Assembly of scientists at IMI. Secret ballot on site. 2. Adoption of the research and financial report for the activities of IMI in 2024. 3. Miscellaneous. The members of the GMS and the Scientific Council of IMI are obliged to attend the meeting. Information about membership in the GMS could be given by Galya Stoyanova, room 215 at IMI, ext. 3819. Proposals for minutes [...]

Preliminary defense of the PhD dissertation of Svetozar Stankov

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

On January 28, 2025, (Tuesday) at 3:00 p.m. in room 478 of IMI-BAS, a preliminary defense will be held of the dissertation of Svetozar Zlatkov Stankov on Symmetry and metric geometry in Banach spaces to obtain the educational and scientific degree "doctor" in the field of higher education 4. Natural sciences, mathematics and informatics, professional division 4.5 Mathematics, scientific specialty "Mathematical analysis". The dissertation is available at the IMI-BAS library. The pre-defense will be streamed also in ZOOM at: Topic: Предзащита на Светозар Станков Time: Jan 28, 2025 14:30 Sofia Join Zoom Meeting https://us02web.zoom.us/j/87428824274?pwd=rgv2zEtbaQuKC4oTKodF0wUKw8XaaO.1 Meeting ID: 874 2882 4274 Passcode: 258222

Inaugural lecture by Assoc. Prof. Valdemar Tsanov

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

On January 28, 2025 (Tuesday) at 4:00 p.m. in the Room 478 of IMI-BAN, as part of the Algebra and Logic Seminar, Assoc. Prof. Valdemar Tsanov will deliver an inaugural lecture on: Lie structural theory and geometric theory of invariants

Mathematical Modelling and Numerical Analysis Seminar

Zoom

The next meeting of the seminar of the Mathematical Modeling and Numerical Analysis Department  will be held on January 30, 2025, at 2:00 pm in Zoom.  A talk on: Some mathematical aspects of simulation modeling of physiological processes in plants will be delivered by Dr. Alex Topaj (Bureau Hyperborea Ltd). Abstract: The contribution presents the author’s experience of using mathematical methods to describe plant physiology processes in applied crop models. In contrast to the simplified data-based empirical approach, the mechanistic description of plant vital processes in theory allows us to obtain new knowledge and to develop the universal crop models with parameters having physical meaning. Such explanatory models, in addition to the traditional cause-and-effect method (the flow-balance approach, leading to systems of differential or [...]

ICMS Seminar

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

Time: February 4, 2025, 2:00 pm Place: Room 403, IMI - BAS Speaker: Miroslav Georgiev, Institute of Mathematics and Informatics, Bulgarian Academy of Sciences Title: Yukawa regulators in electrodynamics: Exact approach to the self-energy and anomalous g-factor Further information: https://icms.bg/yukawa-regulators-in-electrodynamics-exact-approach-to-the-self-energy-and-anomalous-g-factor-icms-seminar-talk-by-miroslav-georgiev/ Abstract. In the present talk, we will discuss the prospect of electrodynamics in quantifying the self-interaction of a non-composite charged particle. We will demonstrate that under the consideration of unique to the particle Yukawa cut-offs the radial singularity in corresponding electromagnetic field potentials’ is removed allowing the classical theory to admit exact solutions for the particle’s self-energy and anomalous g-factor. Highly accurate results for the electron’s and muon’s anomalous g-factor will be presented, with calculated values matching the most recent measurements reported in the [...]

ICMS Seminar

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

Time: February 11, 2025, 2:00 pm Place: Room 403, IMI - BAS Speaker: Sergey Favorov, Department of Pure Mathematics, Kharkov National University, Ukraine Title: Fourier quasicrystals and their generalizations, zeros of Dirichlet series, other almost periodic objects Further information: https://icms.bg/fourier-quasicrystals-and-their-generalizations-zeros-of-dirichlet-series-other-almost-periodic-objects-icms-seminar-talk-by-sergey-favorov/ Abstract. A complex measure \mu on a d -dimensional Euclidean space is a crystalline measure (CM) if it is the temperate distribution, its distributional Fourier transform \hat\mu is also a measure, and supports of \mu and \hat\mu are discrete (locally finite); \mu is a Fourier quasicrystal (FQ) if, in addition, |\mu| and |\hat\mu| are also temperate distributions. For example, if \mu_0 is the sum of the unit masses at all points with integer coordinates, then by Poisson’s [...]

Conference “Dynamic Mathematics in Education”

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

The Department of Education in Mathematics and Informatics of IMI-BAS is organizing a one-day conference "Dynamic Mathematics in Education", which will be held on February 15, 2025 at IMI-BAS. The aim is to share and analyze the experience gained from the use of dynamic educational environments in the learning process (at all levels and in various forms). Participants will have 10 minutes to present their work related to education in mathematics and information technology, which contains some dynamic form of presenting the learning content and/or conducting the teaching process. The works can also be presented as a poster. We expect: presentations based on computer environments; devices and systems for dynamic presentation of mathematical facts; sketches, plays, dances and other art forms. A paper supporting [...]

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 February 21, 2025 (Friday) at 1:00 pm (UTC+2). A talk on: Classification of C*-algebras through the lens of Cartan subalgebras will be delivered by Ali Raad (American University in Bulgaria). Abstract.C*-algebras were introduced in the last century following various attempts to mathematically formalize the foundations of quantum mechanics. As such they encapsulate the study of noncommutative topology, as every C*-algebra is an algebra of bounded operators on some Hilbert space. Over the years there has been a significant attempt to classify C*-algebras by an invariant consisting of K-theoretic and tracial data. A recent breakthrough result has shown that every classifiable C*-algebra has a distinguished Abelian subalgebra called a Cartan subalgebra. Cartan subalgebras [...]

Defense of the PhD dissertation of Maria Pashinska-Gadzheva

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

The Institute of Mathematics and Informatics of BAS and the Scientific Board for the awarding of PhD degree hereby announce that on February 25, 2025, at 1:00 pm, in Room 578 of IMI and in Zoom, an open meeting of the Scientific Board will be held at IMI - BAS for the defense of the doctoral dissertation on: Optimization and parallelization of algorithms related to coding theory of Maria Rumenova Pashinska-Gadzheva Higher Education Field 4. Natural Science, Mathematics and Informatics, Professional field 4.6. Informatics and Computer Science, PhD program “Informatics” Research Advisor: Prof. liya Bouyukliev, D.Sci. Chairman of the Scientific Board: Assoc. Prof. Yuri Borisov, PhD (IMI - BAS) Members of the Scientific Board: Prof. Nikolay Manev, PhD (IMI - BAS) Prof. Nikolay Yankov, [...]

International conference Diophantine and Rationality Problems (DRP2025)

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

The International Center for Mathematical Sciences – Sofia (ICMS-Sofia) at the Institute of Mathematics and Informatics, Bulgarian Academy of Sciences organizes the international conference Diophantine and Rationality Problems (DRP2025)   The conference will be held on March 10 – 14, 2025, in Sofia, Bulgaria. PROGRAMME The conference is part of Horizon Europe MSCA Postdoctoral Fellowship project “Generalised Integrality and Applications to Number Theory” with PI: Vladimir Mitankin, funded by the European Union, Grant agreement 101151205 – GIANT. The event is organized by the International Centre for Mathematical Sciences (ICMS-Sofia) at the Institute of Mathematics and Informatics, Bulgarian Academy of Sciences. The event is supported by Simons Foundation, the European Union and the Ministry of Education and Science of Bulgaria through the Scientific Programme “Enhancing the [...]

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 March 14, 2025 (Friday) at 1:00 pm (UTC+2) in Room 578 of IMI-BAS and online via Zoom. A talk on: Protection Against Noise for a Type of Quantum Computation will be delivered by Valentin Iliev (IMI-BAS, Bulgaria). Abstract. In this presentation we establish necessary and sufficient conditions for some pairs of quantum logic gates which operate on one qubit to be protected against crosstalk. More precisely, it is devoted to the protection against noise for measurement-based quantum computation. We use the notions of (in)dependence of two events in an appropriate classical probability space and the related informational (in)dependence. Zoom link for the seminar: Https://us02web.zoom.us/j/85137375021?pwd=RE5QczdFTE1xL1R6MnI2b1lkcGczQT09 Everybody is invited. Algebra and Logic Department, IMI [...]

Seminar in Operations Research, Probability and Statistics

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

On March 18 (Tuesday) at 2:00 p.m. in Room 503 of IMI, a meeting of the Seminar of the ORPS Department will be held. A talk on: Numerical inverse modelling of volatility identification from option quotes will be delivered by Slavi Georgiev, IMI-BAS. Abstract. The volatility is one of the most important parameters as well as it not directly observable on the market. In this talk we present some approaches to identify the time-dependent volatility, when some information about the option premium is known. We employ an average linearization in time of the diffusion terms of the initial-boundary problems. Then, we decompose the approximate solution with respect to the volatility in order to proceed to the new time layer in the discrete problem. These approaches [...]

Defense of the “Doctor of Science” thesis of Tsvetelin Zaevski

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

The Institute of Mathematics and Informatics of the Bulgarian Academy of Sciences and the Scientific Jury for awarding the scientific degree "Doctor of Science" hereby announce that on March 25, 2025, at 11:00 am (UTC+2), a hybrid open meeting will be held in Room 578 of IMI - BAS and in Zoom of the Scientific Jury for the defense of the dissertation thesis on: An approach for pricing American-style derivatives by Tsvetelin Zaevski in higher education area: 4. Natural Sciences, Mathematics and Informatics Professional field: 4.5. Mathematics. Chairman of the Scientific Jury: Prof. Mladen Savov, D.Sc., Corr. member of the BAS  (IMI - BAS) Members of the Scientific Jury: Acad. Ivan Popchev, D.Sc., (IICT - BAS) Prof. Ognian Kounchev, D.Sc. (IMI - BAN) Prof. [...]

ICMS Seminar

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

Time: March 25, 2025, 2:00 pm Place: Room 403, IMI - BAS Speaker: Mikhail Shkolnikov, IMI - BAS Title: Affine distance function Further information: https://icms.bg/category/icms-seminar/ Abstract. Affine geometry is sometimes described as "what remains of Euclidean geometry when distances are forgotten". In this talk, I will report on a very recent discovery of an affine-invariant notion, which may be viewed as a distance from a point inside a convex domain to its boundary. This new concept stems from a suggestion of Conan Leung, who proposed to average the canonical tropical series, a fundamental notion of tropical optics, over the manifold of all tropical structures of fixed covolume on the given affine space. Very little of what we (Nikita Kalinin, Ernesto Lupercio and me) currently [...]

Applied Mathematics Seminar

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

About m-ary Gray codes Speaker: Maria Pashinska, IMI - BAS Date: March 27, 2025 Time: 2:00 pm Place: Room 503, IMI - BAS Abstract: We present several systemized implementations of the Gray code over an alphabet with m ≥ 2 elements. Gray codes are widely used in digital communications and effective generation of combinatorial objects. We consider two variants - reflected and modular m-ary Gray codes. We present algorithms for their generation and other important functions such as ranking and unranking and functions for generation of a maximal set of non-proportional vectors of length n over the given alphabet. Some applications of the m-ary Gray codes are also considered. This talk is based on joined work with Stefka Bouyuklieva , Iliya Bouyukliev and Valentin [...]

ICMS Seminar

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

Time: March 27, 2025, 4:00 pm Place: Room 403, IMI - BAS Speaker: Luis Ugarte (University of Zaragoza, Spain) Title: Complex structures on Lie algebras and its application to the Hull-Strominger system Further information: https://icms.bg/category/icms-seminar/ Abstract. In this talk we will explain the role that the Lie algebras play in the construction of 6-dimensional compact quotient spaces M=G/Γ, where Γ is a lattice, endowed with an invariant complex structure with holomorphically trivial canonical bundle.We will use the approach of stable forms in six dimensions to provide a classification of unimodular Lie algebras admitting a complex structure with non-zero closed (3,0)-form. Some of these spaces can be equipped with balanced Hermitian metrics and they provide invariant solutions of the Hull-Strominger system, even with non-flat connection [...]

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 March 128, 2025 (Friday) at 1:00 pm (UTC+2) in Room 578 of IMI-BAS and online via Zoom. A talk on: Graded algebras that are the sum of two homogeneous subalgebras will be delivered by Plamen Koshlukov (State University of Campinas, Brazil). Abstract. Let A be an algebra over a field F, graded by a group G, and let B and C be two homogeneous subalgebras of A such that A=B+C. We study the following problem: If B and C satisfy graded identities, does the same also hold for A? The analogous problem for algebras without any grading was proposed in 1994 by Beidar and Mikhalev; in implicit form it appeared in a paper by O. Kegel, in 1963. Several [...]

ICMS Seminar

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

Time: April 11, 2025, 4:00 pm Place: Room 403, IMI - BAS Speaker: Felipe Espreafico Guelerman, Sorbonne Université - Paris Title: On Motivic and Arithmetic Donaldson-Thomas invariants Further information: https://icms.bg/category/icms-seminar/ Abstract. Aiming to understand the relation to other "refined invariants", and especially their possible interpretation in quantum theory, we explain how to obtain a quadratic, A1-version of Donaldson-Thomas invariants from the motivic refinements first introduced in Kontsevich-Soibelman. Following ideas from Behrend, Bryan and Szendroi, we provide predictions for these invariants in a few simple examples, mainly the computation of DT invariants of A3. Our main goal is to draw relationships with the literature, including works of Levine, Denef and Loser, Azouri, Pepin-Lehaulleur, Srinivas among others. We begin with a brief introduction to A1-enumerative geometry [...]

Mathematical Modelling and Numerical Analysis Seminar

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

The next meeting of the seminar of the Mathematical Modeling and Numerical Analysis Department  will be held on April 23, 2025, at 2:00 pm in Room 478 of IMI - BAS.  A talk on: Multiscale Leading Edge and Bulk Dynamics for Tumour Invasion in Fibrous Environment will be delivered by Dr. Dumitru Trucu (University of Dundee, Шотландия). Abstract: Despite all recent in vivo, in vitro, and in silico advances, the understanding of the genuine biologically multiscale process of solid tumour invasion remains one of the greatest open questions for scientific community. In this talk we present novel mathematical multiscale moving boundary modelling and structural analytical approaches for tumour invasion. Specifically, we focus on characterising mathematically key aspects of the dynamic interactions that the migratory cancer cells [...]

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 April 25, 2025 (Friday) at 1:00 pm (UTC+2) in Room 578 of IMI-BAS. A talk on: Hilbert scheme of smooth projective curves and some easy examples will be delivered by Changho Keem (Seoul National University, South Korea). Abstract: Hilbert scheme is a parameter space for a family of projective algebraic varieties sharing a given fixed Hilbert polynomial.  In this talk, we will discuss the following topics concerning the Hilbert scheme of smooth projective algebraic curves. 1. Irreducibility problem of the restricted Hilbert scheme of curves. 2. Some easy examples of reducible Hilbert schemes inside or outside the Brill-Noether range. 3. The existence of more than expected dimensional components whose image under the moduli [...]

Joint meeting of the ICMS Seminar and the “Algebra and Logic” Seminar

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

A joint meeting of the ICMS Seminar and the "Algebra and Logic" Seminar will be held next Tuesday, with a talk by Georges Tomanov. The details are as follows. Tuesday, April 29-th, 2:00 pm, in room 403 of IMI-BAS. Georges Tomanov, Université Claude Bernard, Lyon 1. Group action on homogeneous spaces and applications in number theory Abstract:Many longstanding conjectures and problems in number theory can be reformulated in terms of group actions on homogeneous spaces. This reformulation allows them to be tackled using, alongside deep methods from algebra and algebraic geometry, powerful tools from ergodic theory and dynamical systems. An example of the effectiveness of this approach is Margulis's groundbreaking proof of the Oppenheim conjecture (formulated in 1929) concerning the values of quadratic forms at integer points. [...]

Geometry Seminar of ICMS

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, April 30, 2025, at 4:00 pm, in room 403 and via Zoom. A talk on: Binary Quadratic Forms and Conway’s Topographs (Lecture 1 of 3) will be delivered by Nikita Kalinin, Guangdong Technion Israel Institute of Technology. The next two lectures will be held on 07.05.2025 and 14.05.2025 at 4:00 pm. Abstract: Binary quadratic forms are as elementary as they are mysterious—much like prime numbers. In 1997, John Conway introduced topographs, a powerful geometric tool that provides a geometric visualization of binary quadratic forms and their values. These lectures will explore how topographs, combined with telescoping summation techniques, yield elegant formulas — some with intuitive geometric interpretations. For instance, consider [...]

Geometry Seminar of ICMS

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, May 7, 2025, at 4:00 pm, in room 403 and via Zoom. A talk on: Binary Quadratic Forms and Conway’s Topographs (Lecture 2 of 3) will be delivered by Nikita Kalinin, Guangdong Technion Israel Institute of Technology. The next lecture will be held on 14.05.2025 at 4:00 pm. Abstract: Binary quadratic forms are as elementary as they are mysterious—much like prime numbers. In 1997, John Conway introduced topographs, a powerful geometric tool that provides a geometric visualization of binary quadratic forms and their values. These lectures will explore how topographs, combined with telescoping summation techniques, yield elegant formulas — some with intuitive geometric interpretations. For instance, consider the following result: [...]

ICMS Seminar

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

A meeting of the ICMS seminar will be held on May 13, 2205, at 2:00 pm, in Room 403 of IMI - BAS. Speaker: Milan Zlatanovic (University of Niš) Title: Non-symmetric gravitational theorys Abstract: We will consider a connection with totally skew-symmetric torsion on non-symmetric (semi-) Riemann manifolds that satisfy Einstein’s metric condition (EMC). We proved that an almost Hermitian manifold is a non-symmetric Riemann manifold that satisfies EMC if and only if it is a Nearly Kahler manifold. We will also show what happens in the case of para Hermitian manifold, contact, and para-contact manifolds that satisfy EMC. We show that a connection with skew symmetric torsion satisfying EMC exists on an almost contact metric manifolds when it is D-homothetic to a cosymplectic manifold. [...]

Inaugural lecture by Assoc. Prof. Shkolnikov

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

The inaugural lecture by Assoc. Prof. Mikhail Shkolnikov at the Analysis, Geometry and Topology Department will be held on May 13, 2025, at 3:15 pm in Room 403 of IMI - BAS. Speaker: Mikhail Shkolnikov (IMI – BAS) Title: Introduction to amoebas and tropicalization Abstract: We will start by reviewing the most classical aspects of the theory of amoebas deeply rooted in complex analysis and geometry. Next, we will pass to the notion of a tropical limit of amoebas, and will see how restoring the phase allows to recover topology and deduce intersection-theoretic results. After that, we will discuss some results (and their limitations) obtained with Grigory Mikhalkin in the context of non-commutative versions of amoebas of surfaces and tropical limits of curves inside [...]

Seminar in Operations Research, Probability and Statistics

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

On May 14 (Wednesday) at 3:00 p.m. in Room 503 of IMI, a meeting of the Seminar of the ORPS Department will be held. A talk on: Busy Beaver for n=5, or How Complex are the Simple Programs will be delivered by Georgi Georgiec, Faculty of Mathematics and Informatics, Sofia University. Abstract. How long can a Turing machine with 5 states and the alphabet {0,1} run before it stops? The tape is initially filled with zeros. Known as “Busy Beaver for n=5” or BB(5), the problem is understandable to any student interested in programming. Solving it took 40 years and demonstrated how complex semantic analysis of even microscopic programs is. The story was told in a fascinating way a year ago in Quanta Magazine: [...]

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 May 16, 2025 (Friday) at 1:00 pm (UTC+2) in Room 503 of IMI-BAS. A talk on: Grätzer-Schmidt Theorem in arithmetical transfinite recursion will be delivered by Soowhan Yoon (American University in Bulgaria). Abstract: We assess the reverse mathematical strength of the Grätzer-Schmidt theorem (GS) as a principle in second order arithmetic. The theorem GS was studied in an article by Katie Brodhead, Mushfeq Khan, Bjørn Kjos-Hanssen, William A. Lampe, Paul Kim Long V. Nguyen, and Richard A. Shore, where they establish the provability of GS in Π11 Comprehension (Π11-CA0) and its restrictive variant GSD in arithmetical comprehension (ACA0). It will be shown that the arithmetical transfinite recursion (ATR0) is sufficient to prove GS. [...]

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 June 2, 2025, at 2:35 pm in Room 278 of IMI – BAS. A talk on: Analysis of the results of the Fall Mathematical Tournament will be delivered by Miroslav Marinov.

ICMS Seminar

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

The ICMS seminar continues with a series of four lectures by Dr. Peter Dalakov, as follows: Dates: June 3rd, 6th, 10th, 13th, 2:00 pm Place: Room 403, ИМИ-БАН Speaker: Peter Dalakov (IMI and AUBG) Topic: Special Kaehler Geometry and some applications Abstract: In this short sequence of lectures we will discuss the notion of special Kaehler structure and some of its links to complex algebraic geometry, in particular, complex Lagrangians, variations of Hodge structures and algebraic integrable systems. The sequence will conclude with examples related to various moduli spaces of Higgs bundles on curves. For more information please visit the site of the ICMS Seminar: https://icms.bg/category/icms-seminar/  

Applied Mathematics Seminar

Zoom

The next meeting of the Applied Mathematics Seminar will be held online on June 3, 2025, at 3:00 pm: Join Zoom Meeting https://us02web.zoom.us/j/87588684853?pwd=4xPgBSVfxBwjV4P8hrsHn2rN9gWQGB.1 Meeting ID: 875 8868 4853 Passcode: 711528 A generalization of Meijer's G function motivated by probability Speaker: Dmitrii Karp Abstract: Meijer's G function appeared in probability in 1930-ies even before Meijer's work as the density of the product of independent beta variables and as the density of the likelihood ratio test for samples drawn from many classical probability distributions. It is defined by a contour integral of the appropriate ratio of gamma products (sometimes reducible to the inverse Mellin transform). Replacing the Euler gamma function by the Barnes double gamma function in this contour integral, we introduce a new family of special [...]

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 June 6, 2025 (Friday) at 12:30 pm (UTC+3) in Room 578 of IMI-BAS. A talk on: Holographic probe branes and artificial neural networks will be delivered by Veselin Filev (IMI - BAS). Abstract: In holography, flavour probe branes are used to introduce fundamental matter to the AdS/CFT correspondence. At a technical level, the probes are described by extremizing the DBI action and solving the Lagrange–Euler equations of motion. I will report on applications of artificial neural networks that allow direct minimization of the regularized DBI action (interpreted as a free energy) without the need to derive and solve the equations of motion. I will consider, as examples, magnetic catalysis of chiral symmetry [...]

ICMS Seminar

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

The ICMS seminar continues with a series of four lectures by Dr. Peter Dalakov, as follows: Dates: June 3rd, 6th, 10th, 13th, 2:00 pm Place: Room 403, ИМИ-БАН Speaker: Peter Dalakov (IMI and AUBG) Topic: Special Kaehler Geometry and some applications Abstract: In this short sequence of lectures we will discuss the notion of special Kaehler structure and some of its links to complex algebraic geometry, in particular, complex Lagrangians, variations of Hodge structures and algebraic integrable systems. The sequence will conclude with examples related to various moduli spaces of Higgs bundles on curves. For more information please visit the site of the ICMS Seminar: https://icms.bg/category/icms-seminar/  

ICMS Seminar

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

The ICMS Seminar will meet this Friday, June 6-th, at 14:00, with three lectures by Peter Dalakov, Lyudmil Katzarkov and Ernesto Lupercio from IMI-BAS. The schedule is the following. June 6-th. Room 403 IMI-BAS. 14:00 - 14:50.  Peter Dalakov Special Kaehler Geometry and some applications (Part II) 15:00 - 15:50.  Lyudmil Katzarkov Atoms and Minimal Model Program 16:00 - 16:50. Ernesto Lupercio Elliptic genus and applications Abstracts and more information can be found at https://icms.bg/category/icms-seminar/

International Conference “Singularities in Plovdiv”

Пловдив

Singularities in Plovdiv International Conference Start date: 08.06.2025 End date: 13.06.2025 Event location:  DoubleTree by Hilton Plovdiv Center Hotel, in Plovdiv, Bulgaria The conference is organized by the International Centre for Mathematical Sciences (ICMS–Sofia) at the Institute of Mathematics and Informatics, Bulgarian Academy of Sciences, with the financial support of the Simons Foundation, The Ministry of Education of Science, The Swiss National Science Foundation and Institut de Mathématiques de Jussieu-Paris Rive Gauche. For more information please visit the conference website: https://icms.bg/singularities-in-plovdiv-2025/

ICMS Seminar

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

The ICMS seminar continues with a series of four lectures by Dr. Petеr Dalakov, as follows: Dates: June 3rd, 6th, 10th, 13th, 2:00 pm Place: Room 403, ИМИ-БАН Speaker: Peter Dalakov (IMI and AUBG) Topic: Special Kaehler Geometry and some applications Abstract: In this short sequence of lectures we will discuss the notion of special Kaehler structure and some of its links to complex algebraic geometry, in particular, complex Lagrangians, variations of Hodge structures and algebraic integrable systems. The sequence will conclude with examples related to various moduli spaces of Higgs bundles on curves. For more information please visit the site of the ICMS Seminar: https://icms.bg/category/icms-seminar/  

ICMS Seminar

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

The ICMS seminar continues with a series of four lectures by Dr. Petеr Dalakov, as follows: Dates: June 13th, 2:00 pm Place: Room 403, ИМИ-БАН 14:00 – 15:30.  Peter Dalakov Special Kaehler geometry and some applications (Part IV) 16:00 – 17:00. Ernesto Lupercio Elliptic genera and the geometry of loop spaces and applications Abstracts and more information can be found at: https://icms.bg/category/icms-seminar/  

International Conference BIOMATH 2025

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

Biomath is an international series of conferences devoted to recent research in life sciences based on applications of mathematics as well as mathematics applied to or motivated by biological studies. It is a multidisciplinary meeting forum for researchers who develop and apply mathematical and computational tools to the study of phenomena in the broad fields of biology, ecology, medicine, biophysics, biochemistry, pharmacokinetics, chemoinformatics, biotechnology, bioengineering, environmental science, etc.

ICMS Seminar

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

The next meeting of the ICMS Seminar will be on Friday, with lectures by Alexander Stokolos and Ernesto Lupercio. ICMS Seminar Friday, June 20-th. Room 403 IMI-BAS. 15:30 - 16:30.  Alexander Stokolos (Georgia Southern University) On extremal polynomials Abstract: I will present known and new polynomials emerging from the extremal problems of geometric complex analysis. 16:45 - 17:45. Ernesto Lupercio (IMI-BAS and Cinvestav IPN México) Analysis in Loop Spaces and Genera Abstract: Analysis on loop spaces, motivated by ideas from conformal field theory, leads naturally to the construction of elliptic genera—topological invariants with deep modular and representation-theoretic properties. Мore information can be found at the seminar's website https://icms.bg/category/icms-seminar/

Defense of the PhD dissertation of Svetozar Stankov

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

The Institute of Mathematics and Informatics of BAS and the Scientific Board for the awarding of PhD degree hereby announce that on June 24, 2025, at 2:00 pm, in Room 256 of IMI and in Zoom, an open meeting of the Scientific Board will be held at IMI - BAS for the defense of the doctoral dissertation on: Symmetry and metric geometry in Banach spaces of Svetozar Stankov Higher Education Field 4. Natural Science, Mathematics and Informatics, Professional field 4.5. Mathematics, PhD program “Mathematical Analysis” Research Advisor: Prof. Denka Kutzarova, D.Sci. Chairman of the Scientific Board: Acad. Julian Revalski Members of the Scientific Board: Acad. Stanimir Troyanski Prof. Mikhail Krastanov, D.Sci. Prof. Lyudmila Nikolova, D.Sci. Assoc. Prof. Milen Ivanov, PhD The documents related to [...]

Mathematical Foundations of Informatics Seminar

Veliko Tarnovo University 2, Teodosiy Tarnovski Str., Veliko Tarnovo

The seminar on MATHEMATICAL FOUNDATIONS OF COMPUTER SCIENCE organized by the Department of Mathematical Foundations of Informatics at IMI - BAS and the Faculty of Mathematics and Informatics of Veliko Tarnovo University (VTU), would like to invite you to the next meeting on July 3, 2025 at 2:30 p.m. in room 508, building 4 of VTU. Svetoslava Minkova Master Degree Program in Mathematical Structures in Information Security Faculty of Mathematics and Informatics, Veliko Tarnovo University will deliver a talk on: Weisfeiler-Leman algorithm and graph isomorphism invariants  

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, Jully 9th, at 16:00, room 403 and via Zoom: https://icms.bg/around-combinatorial-viros-patchworking-geometry-seminar-talk-by-arthur-renaudineau/ Zoom link: https://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1

Joint Seminar of the Analysis, Geometry and Topology Department

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

On July 15, 2025, at 1:00 pm in Room 403 there will be a joint seminar of the Analysis, Geometry and Topology Department and the International Center for Mathematical Sciences – Sofia (ICMS-Sofia). A talk on: Weak Metric Structures on Generalized Riemannian Manifolds will be delivered by Milan Zlatanovic, University of Niš, Serbia. Abstract. Linear connections with torsion are important in the study of generalized Riemannian manifolds (M , G=g+F ), where the symmetric part g of G is a non-degenerate (0,2)-tensor and F is the skew-symmetric part. Some space-time models in theoretical physics are based on (M, G=g+F) , where F is defined using a complex structure. In the lecture, we will show more general models, where F [...]

Joint Seminar of the Analysis, Geometry and Topology Department

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

A joint meeting of the ICMS Seminar and the seminar "Analysis, geometry and topology" at IMI-BAS will be held next Tuesday, with a talk by Elia Fusi. The details are as follows. Tuesday, July 22-nd, 1:00 pm, room 403 of IMI-BAS. Elia Fusi, University of Torino. Special metrics in hypercomplex geometry Abstract:The existence of special hyperHermitian metrics plays an important role in the study of hypercomplex manifolds. In this talk, after a brief overview of the basic definitions in hypercomplex Geometry, we will discuss two of the main types of special metrics in the hypercomplex setting: quaternionic Gauduchon and strong HKT metrics. First of all, we will discuss sufficient and equivalent conditions for a quaternionic Gauduchon metric to exist.  Afterwards, we will show that strong [...]

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 22-nd, 13:00 o'clock, room 403 of IMI-BAS. Elia Fusi, University of Torino. Special metrics in hypercomplex geometry Abstract: The existence of special hyperHermitian metrics plays an important role in the study of hypercomplex manifolds. In this talk, after a brief overview of the basic definitions in hypercomplex Geometry, we will discuss two of the main types of special metrics in the hypercomplex setting: quaternionic Gauduchon and strong HKT metrics. First of all, we will discuss sufficient and equivalent conditions for a quaternionic Gauduchon metric to exist.  Afterwards, we will show that strong HKT and balanced hyperHermitian metrics cannot coexist on a compact non-hyperKähler manifold, proving a particular instance of the Fino-Vezzoni conjecture. Finally, we will introduce an Einstein [...]

19th International Summer Conference on Probability and Statistics

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

19th International Summer Conference on Probability and Statistics 24.07.2025 – 27.07.2025 Sofia, Bulgaria The conference organisers cordially invite their colleagues to participate in the 19th International Summer Conference on Probability and Statistics, to be held in the Institute of Mathematics and Informatics, Sofia, Bulgaria, from July 24 to 27, 2025. Co-organizers of the event are: Institute of Mathematics and Informatics of the Bulgarian Academy of Sciences Faculty of Mathematics and Informatics of Sofia University St. Kliment Ohridski For more information: http://www.math.bas.bg/~statlab/ISCPS2025/

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 department MATHEMATICAL FOUNDATIONS OF INFORMATICS will be held on July 24, 2025, at 2:00 p.m. in room 403. Prof. Mark Iwen will deliver a talk on: Sparse Spectral Methods for Solving High-Dimensional and Multiscale Elliptic PDEs Prof. Iwen is part of the Department of Computational Mathematics of Michigan State University. His research interests include mathematical data science, signal processing and others. The talk will include some unexpected connections to certain error-correcting codes. Abstract. In his monograph "Chebyshev and Fourier Spectral Methods", John Boyd claimed that, regarding Fourier spectral methods for solving differential equations, "[t]he virtues of the Fast Fourier Transform will continue to improve as the relentless march to larger and larger [bandwidths] continues" [1, pg. 194]. This [...]

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

Go to Top