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ICMS Colloquium

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Time: 19.03.2024, Wednesday, 4:00 pm Place: Zoom only Lecturer: Vesselin Petkov (Université Bordeaux) Title: Dynamical zeta function for billiard flow Abstract: We will present briefly the connection between Riemann zeta function, Ruellle zeta function and dynamical zeta function. The last one is related to the billiard flow for the union D \subset R^d of a finite collection of pairwise disjoint strictly convex compact obstacles. Let \mu_j \in C , \Im \mu_j > 0 be the resonances of the Laplacian in the exterior of D with Neumann or Dirichlet boundary condition on \partial D . For d odd, u(t) = \sum_j e^{i |t| \mu_j} is a distribution in \mathcal{D}'(R \setminus \{0\}) and the Laplace transforms of the leading [...]

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, March 20, 2024, at 16:00, in room 403 and via Zoom. A talk on: Ellipsoid superpotentials: obstructing symplectic embeddings by singular algebraic curves will be delivered by Grigory Mikhalkin, University of Geneva. Abstract: How singular can be a local branch of a plane algebraic curve of a given degree d? A remarkable series of real algebraic curves was constructed by Stepan Orevkov. It is based on even-indexed numbers in the Fibonacci series: a degree 5 curve with a 13/2 cusp, a degree 13 curve with a 34/5-cusp, and so on. We discuss this and other series of algebraic curves in the context of the problem of symplectic packing of an ellipsoid [...]

Preliminary defense of the PhD dissertation of Dimitar Dobrev

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

On March 22 (Friday) at 11 a.m. in room 503 of IMI-BAS, a preliminary defense will be held of the dissertation project of Dimitar Dimitrov Dobrev on Artificial Intelligence -- Definition, Implementation and Implications 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 logic". The draft dissertation is available at the IMI-BAS library and online at: https://dobrev.com/AI/Dobrev_PhD_v3.pdf  (main text) https://dobrev.com/AI/Dobrev_PhD_avtoref.pdf  (abstract in Bulgarian) https://dobrev.com/AI/Dobrev_PhD_abstract.pdf  (abstract in English). The pre-defense will be streamed also in ZOOM at: https://us02web.zoom.us/j/85137375021?pwd=RE5QczdFTE1xL1R6MnI2b1lkcGczQT09 Everybody is invited. Algebra and Logic Department, IMI – BAS, http://www.math.bas.bg/algebra/seminarAiL/

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 online via Zoom on March 22, 2024 (Friday) at 1:00 pm (UTC+2). A talk on: On the uniqueness of maximal solvable extensions of nilpotent Lie algebras will be delivered by Bakhrom A. Omirov (Harbin Institute of Technologies, Harbin, China and Romanovskiy Institute of Mathematics, Uzbekistan Academy of Sciences, Uzbekistan). Abstract.During the talk it will be shown that under certain condition an arbitrary complex finite-dimensional maximal extension of a nilpotent Lie algebra N is isomorphic to the semidirect sum of N and its maximal torus. A criterion of the completeness for a finite-dimensional solvable Lie algebra is established. Comparisons with some existing results will also be discussed. Link to the Zoom room: https://us02web.zoom.us/j/85137375021?pwd=RE5QczdFTE1xL1R6MnI2b1lkcGczQT09   Algebra and Logic [...]

Applied Mathematics Seminar

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

On constructions of spherical codes Speaker: Dr. Konstantin Vorob'ev Date: March 27, 2024 Time: 4:00 pm Place: Room 503 Abstract: In this talk, we review various approaches to construct spherical codes with a given coding distance. We also propose a new approach that allows us to find new codes on spheres in small dimensions. In particular, we find a previously unknown kissing arrangement of 40 spheres in R^5.

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, March 20, 2024, at 16:00, in room 403 and via Zoom. A talk on: Reading seminar of geometric Lubin-Tate theory will be delivered by Jiachang Xu, IMI - BAS. Abstract: This is reading seminar of geometry of Lubin-Tate theory, our goal is to understand the papers “M. J. Hopkins and B. H. Gross, Equivariant vector bundles on the Lubin-Tate moduli space” and “Ramero, Lorenzo On a class of étale analytic sheaves”. The first seminar we plan to go over the basis of deformation theory, formal group and necessary rigid geometry. Zoom link: https://us02web.zoom.us/j/83740034721?pwd=VnBtcVpGUktscHQ4a09jZkNZTURyZz09  

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 online via Zoom on March 29, 2024 (Friday) at 1:00 pm (UTC+2). A talk on: Generalized Definability of Discrete Time Interval-based Temporal Connectives will be delivered by Dimitar Guelev (Institute of Mathematics and Informatics, Bulgarian Academy of Sciences). Abstract.In Linear Temporal Logic with past (PLTL), expressive completeness implies that any first-order definable connective is also definable in the temporal language based on the Since and Until temporal operators. This is not the case about discrete time interval-based temporal logics with state-based semantics for the propositional variables. In this talk I prove the next best thing about the extension ITLNL of Moszkowski's discrete time propositional Interval Temporal Logic (ITL) by the neighbourhood modalities: given an interval-based connective # which admits [...]

Differential Equations and Mathematical Physics Seminar

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

The next meeting of the Differential Equations and Mathematical Physics Seminar will be held on April 10, 2024, at 2:15 pm, in Room 478 of IMI - BAS. A talk on CHEMICAL COMPOSITION OF THE SUN DISK AND OF THE STARS’ DISKS. EVOLUTION OF THE STARS. BINARY SYSTEMS. GEOMAGNETIC STORMS. SATELLITES. SOLAR-TERRESTIAL INVESTIGATION AND SOLAR WIND. AIRPLANES AND HELICOPTERS will be delivered by Emilian Atanassov. Всички интересуващи се са добре дошли

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 online via Zoom on April 12, 2024 (Friday) at 1:00 pm (UTC+2). A talk on: On an Aspect of Second Quantum Revolution will be delivered by Valentin Iliev, IMI - BAS. Abstract.The 2022 Nobel Prize in Physics has been awarded to Alain Aspect, John Clauser, and Anton Zeilinger for their work in Quantum Theory. Mass media called this event part of second quantum revolution which includes mainly quantum computing and other super-technologies. Here we discuss Alain Aspect's version of Einstein-Podolsky-Rosen thought experiment and show that there exists an internal dependence of the simultaneous measurements made by the two pairs of linear polarizers operated in each leg of the apparatus during this experiment. [...]

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 16, 2024, at 2:00 p.m. in Room 503 of the Institute of Mathematics and Informatics. A talk on: Convergence Rate for Order 1 Markov Random Walks will be delivered by Peter Gaydarov. Abstract. We examine the limiting behaviour of an order 1 Markov random walk in R2, i.e. a walk that remembers its previous step. Provided a certain symmetry of the Markovian condition, under relatively mild conditions we prove convergence to a Brownian motion and bound the rate of convergence. Therefore, an order 1 Markov condition is insufficient to alter the limiting behaviour of a random walk.  

Featured Featured

Decoding GenAI: Lectures by Dr. Michael Wu

Българска академия на науките ул. "15 ноември" № 1, София

On April 18, 2024, in the Marin Drinov Hall of the Bulgarian Academy of Sciences (Sofia, 15 Noеmvri Street, No. 1), Dr. Michael Wu, artificial intelligence expert at PROS, will give two lectures: 09:00 – 10:15 AM Decoding GenAI: The Science Behind the Magic of ChatGPT 10:45 – 12:00 PM Navigating the Limits of GenAI in Business Decisions—Beyond Productivity Dr. Michael Wu is a Chief AI Strategist at PROS. He is one of the world’s premier authorities on artificial intelligence (AI), machine learning (ML), data science, and behavioral economics. He’s currently the Chief AI Strategist at PROS (NYSE: PRO), an AI-powered SaaS provider that helps companies monetize more efficiently in the digital economy. He’s been appointed as a Senior Research Fellow at the Ecole des Ponts Business School for his work in [...]

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, March 20, 2024, at 16:00, in room 403 and via Zoom. A talk on: Generalised Plucker formula will be delivered by Andrei Benguş-Lasnier, ICMS - Sofia. Abstract: In order to classify objects in singularity theory and algebraic geometry, we define invariants associated to varieties or germs of singularities and hope to have enough tools to compute them easily. From classical projective duality, for any variety X , we can define a dual variety X∗ and we call the class of X the degree of X∗ . Plücker’s formula allows one to compute this class for plane curves with a certain set of nodes, cusps and tacnodes. We will [...]

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 April 29, 2024, at 2:30 pm in Room 278 of IMI – BAS. A talk on: Didactical moments from the last decades will be delivered by Prof. Borislav Lazarov.

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 15, 2024, at 16:00, in room 403 and via Zoom. A talk on: Hyperbolic amoebas will be delivered by Mikhail Shkolnikov, IMI - BAS. Abstract: Classical amoebas serve as a tool to study algebraic varieties and as one of the entry points to tropical geometry. The original definition involves a logarithmic projection of a subvariety of a complex algebraic torus, which can be interpreted as forgetting the phase, i.e. the arguments of complex numbers. In group-theoretic terms, this projection map may be thought of as passing to the quotient by the maximal compact subgroup. Suppose one replaces the algebraic torus with a complex three-dimensional matrix group. In that case, the [...]

Mathemaical Foundations of Informatics Seminar in Veliko Tarnovo

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

A meeting of the Seminar on Mathematical Foundations of Informatics will be held in Veliko Tarnovo on May 16, 2024, at 4:15 pm, in Room 502 of the Faculty of Mathematics and Informatics, Veliko Tarnovo University. A talk on Lee distance in analyzing and modeling rank data will be delivered by Nikolay I. Ivanov, IMI - BAS. Abstract: Distances on permutations are commonly used in rank data analysis and are an efficient tool for constructing probability models for rankings. In this talk, we consider some probabilistic applications of the Lee distance, which was originally developed as a generalization of the Hamming distance for error correction coding in modulation. In particular, we study the “K-means” clustering procedure based on Lee distance and approximate the normalizing [...]

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 May 20, 2024, at 2:30 pm in Room 278 of IMI – BAS. A talk on: Axiomatics and construction of planimetry on a vector basis will be delivered by Assoc. Prof. Boyko Bantchev.

International Conference Modern Methods in Nonlinear Elliptic and Parabolic PDE

Хотел DoubleTree by Hilton Plovdiv Center 1 Saint Petka Square, Plovdiv

From May 27 to 31, an international conference Modern Methods in Nonlinear Elliptic and Parabolic PDE will be held in Plovdiv. The event 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.

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 27, 2024, at 3 p.m. in Room 503 of the Institute of Mathematics and Informatics. A talk on: Towards a Baranyai theorem with additional condition will be delivered by Gyula Katona, Renyi Institute, Budapest, Hungary. Abstract

“Doctor of Science” dissertation thesis defense

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 May 28, 2024, at 12:30 pm (UTC+3), a hybrid open meeting will be held (in Room 256 of IMI - BAS and in Zoom) of the Scientific Jury for the defense of the dissertation thesis on: Extremal problems in Euclidean Combinatorial Geometry by Assoc. Prof. Dr. Danila Cherkashin in higher education area: 4. Natural Sciences, Mathematics and Informatics Professional field: 4.5. Mathematics. Chairman of the Scientific Jury: Prof. Ivan Landjev, D.Sc., (IMI - BAS) Members of the Scientific Jury: Prof. Mladen Savov, D.Sc., Corr. member of the BAS  (IMI - BAS); Prof. Emil Kolev, D.Sc. (IMI [...]

Applied Mathematics Seminar

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

On constructions of spherical codes Speaker: Ivan Hristov, FMI, Sofia University Date: May 28, 2024 Time: 3:00 pm Place: Room 503, IMI - BAS Abstract: The classic gravitational three-body problem is considered. The motion of the bodies is determined by Newton’s second law and Newton’s law of universal gravitation. We are interested in a special case of planar periodic orbits – those that pass through Euler configuration. In this talk a new efficient approach for searching three-body periodic equal-mass collisionless orbits passing through Euler configuration is presented [1]. The approach is based on a symmetry property of the solutions at the half period. Depending on two previously established symmetry types on the shape sphere, each solution is presented by one or two distinct initial conditions [...]

General Meeting of the Scientists of IMI-BAS

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 meeting of the General Meeting of the Scientists at IMI will be held on May 29, 2024 (Wednesday) at 1:00 p.m. in Room 055 "Acad. Stefan Dodunekov", floor -1 of IMI, with the following agenda: Amendments and additions to the Operational Regulations of IMI. Acceptance of the list of candidates participating in the election for IMI representatives at the General Assembly of the Bulgarian Academy of Sciences. Acceptance of the list of candidates participating in the election for the Scientific Council of IMI. Determination of procedural rules for the conduct of the elections for the General Assembly of BAS and the Scientific Council of IMI. Miscellaneous. The departments and the members of the [...]

Defense of the PhD thesis of Mladen Valkov

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 May 31, 2024, at 11:00 a.m., an open meeting of the Scientific Board will be held at IMI - BAS for the defense of the doctoral dissertation on: Development of digital competence in mathematics education of Mladen Georgiev Valkov Higher Education Field 1. Pedagogical Science, Professional field 1.3. Pedagogy of education in..., PhD program “Methodology of education in mathematics, informatics and information technology” Research Advisor: Prof. Toni Chehlarova, PhD (IMI - BAS) Chairman of the Scientific Board: Prof. Borislav Lazarov, PhD (IMI - BAS) Members of the Scientific Board: Acad. Petar Kenderov Prof. Emil Kolev, D.Sc. (IMI - BAS) Prof. Galya Kozhuharova, [...]

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 June 4, 2024, at 2:00 p.m. in Room 503 of the Institute of Mathematics and Informatics. A talk on: Comparison of parameter estimation methods for a Beta-Uniform mixture model will be delivered by Nikolay I. Nikolov (IMI - BAS). Abstract.The Benjamini-Hochberg (B-H) method is a procedure for controlling the false discovery rate in the problem of multiple comparisons and is one of the most cited scientific works. In this talk, a Beta-Uniform mixture is considered for approximating the distribution of the p-values before the B-H adjustment. Expectation-maximization algorithms are derived for finding the maximum-likelihood and the maximum product of spacings estimations of the parameters in the suggested model. In [...]

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 online via Zoom on April 12, 2024 (Friday) at 1:00 pm (UTC+2). A talk on: On an Aspect of Second Quantum Revolution will be delivered by Valentin Iliev, IMI - BAS. Abstract.The 2022 Nobel Prize in Physics has been awarded to Alain Aspect, John Clauser, and Anton Zeilinger for their work in Quantum Theory. Mass media called this event part of second quantum revolution which includes mainly quantum computing and other super-technologies. Here we discuss Alain Aspect's version of Einstein-Podolsky-Rosen thought experiment and show that there exists an internal dependence of the simultaneous measurements made by the two pairs of linear polarizers operated in each leg of the apparatus during this experiment. [...]

Joint Seminar of ICMS and MFI Department

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

Joint meeting of the ICMS Seminar and the seminar of the Department of Mathematical Foundations of Informatics will be held on Friday, June 6, at 2:00 p.m. in Room 403 of IMI. A talk on: Multivariate P- and Q-polynomial association schemes will be delivered by  Eiichi Bannai (Kyushu University). https://icms.bg/multivariate-p-and-q-polynomial-association-schemes-talk-by-eiichi-bannai/

ICMS: Fourth annual meeting of young Bulgarian mathematicians

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

The International Center for Mathematical Sciences organizes Fourth annual meeting of young Bulgarian mathematicians June 11-12, 2024 The International Center for Mathematical Sciences (ICMS-Sofia) organizes the Annual Meeting of Young Bulgarian Mathematicians for the fourth consecutive year. A special guest at the event will be Mladen Savov, Professor at Sofia University and the Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences, and a corresponding member of the Bulgarian Academy of Sciences. Read more about the event at https://icms.bg/fourth-annual-meeting-of-young-bulgarian-mathematicians/.

Operations Research Seminar

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

The next meeting of the Operations Research Seminar will be held on June 11th (Tuesday) at 2:00 pm in Room 503 of IMI - BAS. A talk on Mathematical modelling of torque-velocity and torque-angle relationships will be held by Prof. Peter Milanov, IMI - BAS and South-West University.

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 June 11, 2024, at 3 p.m. in Room 503 of the Institute of Mathematics and Informatics. A talk on: Hadamard matrices with automorphisms of prime order and related codes will be delivered by Vladimir D. Tonchev Michigan Technological University, Houghton, USA. The abstract can be found here.

Operations Research Seminar

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

The next meeting of the Operations Research Seminar will be held on June 18th (Tuesday) at 2:00 pm in Room 503 of IMI - BAS. A talk on Mathematical modelling of torque-velocity and torque-angle relationships  - part 2: numerical results will be held by Prof. Peter Milanov, IMI - BAS and South-West University.

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 June 6, 2024 (Wednesday) at 4:15 pm EET (UTC +2) in the Conference Room of IMI - BAS. A talk on: Stability of periodic waves will be delivered by Prof. Sevdzhan Hakkaev, Institute of Mathematics and Informatics, Bulgarian Academy of Sciences. Abstract Everybody is invited.  

Differential Equations and Mathematical Physics Seminar

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

The next meeting of the Differential Equations and Mathematical Physics Seminar will be held on July 1, 2024, at 2:00 pm, in Room 578 of IMI - BAS and online in Zoom. A talk on p-Adic Numbers, Neural Networks, Deep Learning, and Statistical Field Theories will be delivered by Prof. W. A. Zuniga-Galindo from University of Texas Rio Grande Valley. ABSTRACT The talk aims to glimpse our recent research work on the mathematical foundations of hierarchical neural networks.  I plan to cover the following topics: (1) the non-Archimedean Wilson-Cowan Model; (2) p-adic Cellular Neural Networks; (3) p-Adic Statistical Field Theory and Deep Boltzmann Machines. In the first part of the talk, I present a hierarchical version of the Wilson-Cowan model, one of the most relevant [...]

Operations Research Seminar

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

The next meeting of the Operations Research Seminar will be held on July 2nd (Tuesday) at 2:00 pm in Room 503 of IMI - BAS. A talk on On some contemporary mathematical methods for data analysis will be held by Prof. Pando Georgiev, IMI - BAS. Abstract: We will review some selected methods and algorithms for data analysis: A) Latent component analysis - reveals hidden features of composite data. Particularly, we will describe some     Signal Separation Methods: based on statistical independence - Independent Component Analysis based on sparsity. - Sparse Component Analysis based on non-negativity - Non-Negative Matrix and Tensor Factorization B) New approach to multiclass learning problems and applications to some problems in machine learning, as: nonlinear least square problems subspace [...]

Differential Equations and Mathematical Physics Seminar

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

The next meeting of the Differential Equations and Mathematical Physics Seminar will be held on July 3, 2024, at 2:00 pm, in Room 478 of IMI - BAS and online in Zoom. A talk on METHOD OF PRECISE DIAGONALIZATION IN THE FIELD OF MOLECULAR MAGNETISM will be delivered by Dr. Miroslav Georgiev. Topic: Доклад на д-р Мирослав Георгиев Time: Jul 3, 2024 14:00 Sofia Join Zoom Meeting https://us02web.zoom.us/j/87099331737?pwd=w8894QHkbq1UTc2n3qr7dC7yTLPYI6.1 Meeting ID: 870 9933 1737 Passcode: 263339

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 July 3, 2024, at 2:00 p.m. in Room 503 of the Institute of Mathematics and Informatics. A talk on: Control Problems for Queuing Systems with Moving Servers will be delivered by Asaf Hajiyev (Azerbaijan National Academy of Sciences, Institute of Control systems). Abstract.For queuing systems with moving servers, the control policy which means delays of a beginning service is introduced. In the capacity of efficiency index of systems is taken a customer’s average waiting time before service. Although it seems that it is a paradoxical idea to delay the beginning of service, it has been proved that for some systems it gives a gain in a customer’s average waiting [...]

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 July 09, 2024, at 3 p.m. in Room 256 of the Institute of Mathematics and Informatics. A talk on: Linear and polycyclic codes over some affine algebra rings will be delivered by Edgar Martìnez-Morо, University of Valladolid, Castilla, Spain 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 Mathematical Foundations of Informatics seminar will be held on July 10, 2024, at 3 p.m. in Room 256 of the Institute of Mathematics and Informatics. A talk on: A Bollobás-type problem: from root systems to Erdős–Ko–Rado will be delivered by Qendrim Gashi, Department of Mathematics, University of Prishtina   The abstract can be found here.

Talk by Dr. Marta Pieropan

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

On July 30, 2024, Dr. Marta Pieropan from Utrecht University will present a new version of the hyperbola method that is suitable to count rational points of bounded height on algebraic varieties. Anyone interested is welcome! The details of her talk are as follows: Tuesday (30.07), 14:00 - 15:00, Room 403 Title: Rational points and Campana points on toric varieties and their subvarieties Abstract: In joint work with Damaris Schindler we develop a new version of the hyperbola method for counting rational points of bounded height that generalizes the work of Blomer and Brüdern for products of projective spaces. The hyperbola method transforms a counting problem into an optimization problem on certain polytopes. For rational points on subvarieties of toric varieties, the polytopes have [...]

ICMS Seminar

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

Time: August 6, 2024, 2:00 pmPlace: Room 403, IMI - BASSpeaker: Prof. Mladen Dimitrov Brown  (University of Lille)Title: P-adic L-functions and the geometry of the EigencurveFurther information: https://icms.bg/p-adic-l-functions-and-the-geometry-of-the-eigencurve-talk-by-mladen-dimitrov/Abstract. For centuries, understanding special values of L-functions has been a significant research topic in number theory. Their study has been central to many celebrated pieces of mathematics, from Dirichlet’s theorem on primes in arithmetic progressions and the class number formula to the Riemann hypothesis and the Birch and Swinnerton-Dyer (BSD) conjecture, two of the famous millennium problems.The BSD conjecture predicts that the Mordell–Weil rank of an elliptic curve is given by the order of vanishing of its L-function the central point. Iwasawa theory, in turn, seeks to relate the arithmetic over the p-adic cyclotomic extension with the [...]

New Birational Invariants: A New Look at Kontsevich-Pestun-Tschinkel Invariants – Educational Workshop

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

The International Center for Mathematical Sciences – Sofia organizes Educational Workshop New Birational Invariants: A New Look at Kontsevich-Pestun-Tschinkel Invariants August 7, 2024, IMI-BAS, Hall 403   The workshop is a part of the project “Categorical Kaehler Geometry and Applications” with PI: Ludmil Katzarkov, funded by the National Science Fund of Bulgaria, National Scientific Program VIHREN, Project № KP-06-DV-7. Programme. Speakers: Ludmil Katzarkov Ernesto Lupercio Leonardo Cavenaghi More details can be found at https://icms.bg/new-birational-invariants-a-new-look-at-kontsevich-pestun-tschinkel-invariants/.

IMSAC Days in Sofia Conference

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

International Centre for Mathematical Sciences (ICMS-Sofia) at the Institute of Mathematics and Informatics, Bulgarian Academy of Sciences, and the Institute for the Mathematical Sciences of the Americas (IMSA) at the University of Miami, with the financial support of the Simons Foundation organize IMSAC Days in Sofia This small event is to celebrate the very successful collaboration between the institutes involved in the Institute of the Mathematical Sciences of the Americas Consortium (IMSAC), solidify our connections and expand even more the prosperous cooperation. Programme and more information can be found at https://icms.bg/imsac-days-in-sofia-conference/

International Conference Integrability, Q-systems and Cluster Algebras

Varna, Bulgaria Varna

International Centre for Mathematical Sciences (ICMS-Sofia) at the Institute of Mathematics and Informatics, Bulgarian Academy of Sciences, organizes the international conference Integrability, Q-systems and Cluster Algebras August 11 – 18, 2024 Varna, Bulgaria The event is organized with the financial support of the Simons Foundation. Organizers: Ivan Todorov, Ivan Kostov, Valentina Petkova, Vesselin Filev, Todor Popov,  Radoslav Rashkov,  Neli Stoilova, Tzvetan Vetzov More details can be found at: https://icms.bg/event/integrability-q-systems-and-cluster-algebras/  

International Conference Complex Geometry at Large

Слънчев бряг Слънчев бряг, България

International Centre for Mathematical Sciences (ICMS-Sofia) at the Institute of Mathematics and Informatics, Bulgarian Academy of Sciences, and the Institute for the Mathematical Sciences of the Americas (IMSA) at the University of Miami, organize the international conference Complex Geometry at Large August 12 – 16, 2024 Sunny Beach, Bulgaria The event is organized with the financial support of the Simons Foundation. Organizers: Oscar García-Prada (Instituto de Ciencias Matemáticas— ICMAT, Madrid) Ernesto Lupercio (Cinvestav, Mexico) Tony Pantev (University of Pennsylvania) Ugo Bruzzo (SISSA, Trieste and Universidade Federal da Paraíba, João Pessoa, Brazil) Velichka Milousheva (IMI-BAS) Peter Dalakov (IMI-BAS and American University in Bulgaria) In recent years several big advances enhance the field of complex geometry: Generalized geometries, Higgs and Langlands theory, Generalized Hodge theory, Hyperkaehler [...]

Applied Mathematics Seminar

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

Subdiffusion-reaction systems: from microscopic random walk to the mesoscopic fractional PDE's Speaker: Yana Teplitskaya Date: September 3, 2024 Time: 2:00 pm Place: Room 256, IMI - BAS Abstract

ICMS Seminar

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

Time: September 10, 2024, 2:00 pm Place: Room 403, IMI - BAS Speaker: Boaz Moerman (Utrecht University) Title: Generalized integral points and strong approximation Further information: https://icms.bg/generalized-integral-points-and-strong-approximation-talk-by-boaz-moerman/ Abstract. The Chinese remainder theorem states that given coprime integers p_1, …, p_n and integers a_1, …, a_n , we can always find an integer m such that m \equiv a_i \mbox{ mod } p_i for all i . Similarly given distinct numbers x_1,…, x_n and y_1, …, y_n we can find a polynomial f such that f(x_i)=y_i . These statements are two instances of strong approximation for the affine line (over the integers \mathbb{Z} and the polynomials k[x] over a field k ). In this talk we will [...]

Applied Mathematics Seminar

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

Subdiffusion-reaction systems: from microscopic random walk to the mesoscopic fractional PDE's Speaker: Prof. Sergei Fedotov, head of the applied group of the Mathematics Department of the University of Manchester Date: September 11, 2024 Time: 2:00 pm Place: Room 403, IMI - BAS Abstract: An interesting feature of subdiffusion-reaction systems is the lack of a universal model for reactions in subdiffusive media. Consequently, the coarse-grained fractional subdiffusion-reaction equations depend on the specific details of the underlying microscopic random walk models. This complexity arises from the memory effects inherent in subdiffusive transport systems. Simply adding a reaction term to the transport equation can be physically inconsistent. Due to the memory effect, the subdiffusion process depends on the entire history of the system’s evolution making the diffusion and [...]

Differential Equations and Mathematical Physics Seminar

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

The next meeting of the Differential Equations and Mathematical Physics Seminar will be held on September 11, 2024, at 2:00 pm, in Room 478 of IMI - BAS and online in Zoom. A talk on Wigner’s elementary systems in de Sitter spacetime will be delivered by Hamed Pejhan. Abstract: Quantum elementary systems are associated with (projective) unitary irreducible representations (UIRs) of the relativity group (or one of its covering groups). This foundational perspective was first introduced by Wigner in his seminal 1939 paper, within the framework of Einstein-Poincaré relativity. In this talk, building on Wigner’s approach, we will briefly introduce the de Sitter relativity group, its representations, and outline the basics of constructing elementary systems within the global structure of de Sitter spacetime. Zoom [...]

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 September 18, 2024, at 2:00 pm in Room 478 of the Institute of Mathematics and Informatics. A talk on: Singular perturbation theory in epidemic modelling will be delivered by Sara Sottile (University of Bologna, Italy). Abstract: In real world scenarios, the natural phenomena usually evolve on time scales differing by various orders of magnitude. Such separation in time-scales can be found, for example, in the field of chemical oscillations [1], neuroscience [2], ecology [3] or opinion/information spreading [4]. In this context, Geometric Singular Perturbation Theory (GSPT) is a powerful analytical technique which fully exploits the underlying time-scale separation. Epidemiological models also provide a natural fit for these [...]

WMI 2024: Week of Mathematics and Informatics

Хотел Марина Роял Палас, в. с. Дюни

This international conference is dedicated to the 135th foundation anniversary of the Faculty of Mathematics and Informatics – Sofia University “St. Kliment Ohridski”.  The event will feature plenary and contributed talks in different areas of Mathematics, Computer Science and Methods in Education. The conference is organized by the Faculty of Mathematics and Informatics – Sofia University “St. Kliment Ohridski” in collaboration with the Institute of Mathematics and Informatics of the Bulgarian Academy of Sciences and the scientific program “Enhancing the Research Capacity in Mathematical Sciences” (PIKOM). To present a talk, please submit your abstract through the electronic form on the website before July 2nd, 2024. All accepted and registered abstracts will be published in an abstract book. You are invited to submit the corresponding [...]

International Conference on Digital Presentation and Preservation of Cultural and Scientific Heritage—DiPP2024

Регионална библиотека "Пейо Яворов", Бургас ул. Оборище 49-51, Burgas

The Fourteenth International Conference on Digital Presentation and Preservation of Cultural and Scientific Heritage—DiPP2024 aims at presenting innovative results, research projects and applications in the field of digitisation, documentation, archiving, representation and preservation of global and national tangible and intangible cultural and scientific heritage.

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 September 30, 2024, at 2:30 pm in Room 278 of IMI – BAS. A talk on: Preparation of Bulgaria for the Junior Balkan Mathematical Olympiad - resources and recommendations for students, teachers and leaders will be delivered by Assist. Prof. Miroslav Marinov.

Operations Research Seminar

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

The next meeting of the Operations Research Seminar will be held on October 1st (Tuesday) at 2:00 pm in Room 503 of IMI - BAS. A talk on Graphs as an universal modeling tool will be held by Prof. Nicola Yanev, IMI-BAN. Abstract: For a series of practical optimization problems, we show that formulating them as graph optimization problems enables the development of competitive algorithms. The problems considered are known as: protein threading problem, contact map overlap, HP folding, a new scheduling theory problem, classification problem and the biclustering problem. The focus is on formulating them as graph optimization problems, which are solved by using Integer programming techniques.

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 October 2, 2024, at 2:00 p.m. in Room 478 of the Institute of Mathematics and Informatics. A talk on: Lipschitz Permutations on Certain Graphs will be delivered by Dragomir Grozev. Abstract

Defense of the PhD dissertation of Viktoria Bencheva-Petrova

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 October 2, 2024, at 2:00 p.m. in Room 278 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: Differential geometry of timelike surfaces in the four-dimensional Minkowski space of Viktoria Bencheva-Petrova Higher Education Field 4. Natural Science, Mathematics and Informatics, Professional field 4.5. Mathematics, PhD program “Geometry and Topology” Research Advisors: Prov. Velichka Milousheva, PhD (IMI - BAS) Assoc. Prof. Milen Hristov, PhD (Veliko Tarnovo University) Chairman of the Scientific Board: Prof. Stefan Ivanov, D.Sc. (Corresponding member of BAS) Members of the Scientific Board: [...]

Defense of the PhD dissertation of Miroslav Markov

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 October 9, 2024, at 1:00 p.m. in Room 278 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: Efficient Algorithms with Application to Public Key Cryptography and Coding Theory of Miroslav Tsvetkov Markov Higher Education Field 4. Natural Science, Mathematics and Informatics, Professional field 4.6. Informatics and Computer Science, PhD program “Informatics” Research Advisor: Assoc. Prof. Yuri Borisov, PhD (IMI - BAS) Chairman of the Scientific Board: Prof. Iliya Bouyukliev, D.Sc. (IMI - BAS) Members of the Scientific Board: Prof. Stoyan Kapralov, D.Sc. (Technical [...]

Operations Research Seminar

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

The next meeting of the Operations Research Seminar will be held on October 9th (Wednesday) at 2:00 pm in Room 503 of IMI - BAS. A talk on Graphs as an universal modeling tool, Part 2 will be held by Prof. Nicola Yanev, IMI-BAN. Abstract: For a series of practical optimization problems, we show that formulating them as graph optimization problems enables the development of competitive algorithms. The problems considered are known as: protein threading problem, contact map overlap, HP folding, a new scheduling theory problem, classification problem and the biclustering problem. The focus is on formulating them as graph optimization problems, which are solved by using Integer programming techniques.

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 October 14, 2024, at 2:30 pm in Room 278 of IMI – BAS. A talk on: Competition problems with covering colorings in StruniMa will be delivered by Dr. Mladen Valkov.

Joint Seminar of the Analysis, Geometry and Topology Department

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

The next meeting of the Joint Seminar of Analysis, Geometry and Topology Department will be held on October 15, 2024 at 2:00 pm (UTC+2)  in Room 478 of IMI. A talk on: Unimodality Preservation by Ratios of Functional Series and Integral Transforms  will be delivered by Dmitrii Karp, Holon Institute of Technology, Holon, Israel. Everybody is invited. Abstract. Elementary, but very useful lemma due to Biernacki and Krzyz (1955) asserts that the ratio of two power series inherits monotonicity from that of the sequence of ratios of their corresponding coefficients. Over the last two decades it has been realized that, under some additional assumptions, similar claims hold for more general series ratios and integral transforms as well as for unimodality in place of monotonicity. In [...]

Operations Research Seminar

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

The next meeting of the Operations Research Seminar will be held on October 15th (Tuesday) at 2:00 pm in Room 503 of IMI - BAS. A talk on Asymptotic covariance matrix of Capon’s Maximum likelihood estimator and application of steered response power phase alignment algorithm in seismic array data processing will be held by Alexandr Varipaev, Operations Research, Statistics and Probability Department. Abstract: Capon’s estimator was originally developed for frequency-wavenumber power spectral density analysis. Theoretically, it can be treated as maximum likelihood estimator of unknown vector parameter of multidimensional linear system (MLS) model with one input and m outputs.  Practically important and non-trivial case is considered, when the number of nuisance parameters, which are values of input deterministic signal, tends to infinity. Under assumptions that [...]

Joint Seminar of the Analysis, Geometry and Topology Department

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

The next meeting of the Joint Seminar of Analysis, Geometry and Topology Department will be held on October 22, 2024 at 2:00 pm (UTC+2)  in Room 478 of IMI. A talk on: Higher order estimates for Monge-Ampere type equations motivated by quaternionic geometry  will be delivered by Marcin Sroka, Jagiellonian University, Kraków, Poland. Everybody is invited. Abstract. In the talk I will discuss obstacles for obtaining higher order a priori estimates for equation introduced by Alesker and Verbitsky in 2010 on HKT manifolds in relation to Calabi type conjecture on those manifolds (and similar type PDEs studied since on hypercomplex manifolds). After presenting the state of art, I will focus on the key second order estimate. For the real Monge-Ampere equation on Riemannian manifolds it [...]

Operations Research Seminar

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

The next meeting of the Operations Research Seminar will be held on October 22nd (Tuesday) at 2:00 pm in Room 503 of IMI - BAS. A talk on Asymptotic covariance matrix of Capon’s Maximum likelihood estimator and application of steered response power phase alignment algorithm in seismic array data processing, Part 2 will be held by Alexandr Varipaev, Operations Research, Statistics and Probability Department. Abstract: Capon’s estimator was originally developed for frequency-wavenumber power spectral density analysis. Theoretically, it can be treated as maximum likelihood estimator of unknown vector parameter of multidimensional linear system (MLS) model with one input and m outputs.  Practically important and non-trivial case is considered, when the number of nuisance parameters, which are values of input deterministic signal, tends to infinity. Under [...]

14th International Conference “Mathematics of Informational Modeling”

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

14th International Conference Mathematics of Informational Modeling October 24 - 25, 2024 Room 478, Institute of Mathematics and Informatics, Bulgarian Academy of Sciences PROGRAM Join Zoom link: https://us02web.zoom.us/j/83195612669?pwd=t3L1CFlM31H1ZFEKMqLYOte6Qgfw1S.1 Meeting ID: 831 9561 2669 Passcode: 452676

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 October 28, 2024, at 2:30 pm in Room 278 of IMI – BAS. A talk on: The well (un)known Logo: examples, ideas, missed opportunities will be delivered by Assoc. Prof. Boyko Bantchev.

Preliminary defense of the dissertation of Tsvetelin Zaevski for awarding the degree “Doctor of Science”

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

On October 29, 2024 (Tuesday), at 2:00 pm in Room 503 of IMI-BAS, within the Operations Research, Probability and Statistics Seminar, a preliminary defense will be held of the dissertation of Tsvetelin Zaevski on: Utility-based approach for pricing American-style derivatives for awarding of the degree “Doctor of Science”. Everybody is invited. The dissertation can be found at the Library of IMI-BAS.    

National Coding Theory workshop “Professor Stefan Dodunekov”

Парк-хотел "Севастократор, с. Арбанаси

The National Coding Theory workshop with international participation "Profesor Stefan Dodunekov" will be held from 21nd to 24th November 2024 in Hotel “Sevastokrator” (https://sevastokrator.com/) in the village of Arbanassi. The scientific program will be held on 22th and 23th November and includes 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 Tsonka Baicheva, tsonka@math.bas.bg before 11.11.2024. The workshop includes the annual reports session of the Mathematical Foundations of Informatics Department, IMI-BAS, too.

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 November 22, 2024 (Friday) at 1:00 pm (UTC+2). A talk on: On Köthe’s normality question for locally finite-dimensional central division algebras will be delivered by Ivan Chipchakov, IMI - BAS. Abstract. This talk considers Köthe's question of whether every associative locally finite-dimensional (abbr., LFD) central division algebra R over a field K is a normally locally finite (abbr., NLF) algebra over K, that is, whether every nonempty finite subset Y of R is contained in a finite-dimensional central K-subalgebra RY of R. It shows that the answer to the posed question is negative if K is a purely transcendental extension of infinite transcendence degree over an algebraically closed field k. On the other hand, central division LFD-algebras [...]

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 November 25, 2024, at 2:30 pm in Room 278 of IMI – BAS. A talk on: Analysis of the results of the Fall Mathematical Tournament will be delivered by Nevena Sabeva-Koleva.

Defense of the PhD dissertation of Tsvetan Tsokov

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 November 26, 2024, at 11:00 a.m. in Room 256 (Conference Room) 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: IoT platforms and protocols of Tsvetan Krasimirov Tsokov Higher Education Field 4. Natural Science, Mathematics and Informatics, Professional field 4.6. Informatics and Computer Science, PhD program “Informatics” Research Advisor: Assoc. Prof. Hristo Kostadinov, PhD (IMI - BAS) Chairman of the Scientific Board: Assoc. Prof. Krasimira Ivanova, PhD (IMI - BAS) Members of the Scientific Board: Assoc. Prof. Todorka Alexandrova, PhD (IMI - BAS) Assoc. [...]

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, November 27, 2024, at 4:00 pm, in room 403 and via Zoom. A talk on: Tropical compactifications of moduli spaces 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  

Scientific Conference “November Days Of Mathematics And Informatics”

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

Scientific Conference November Days of Mathematics and Informatics November 29-30, 2024, Veliko Tarnovo The conference aims to promote interactions between researchers in the fields of mathematics, informatics, information technology and methods for their teaching and learning. Organizer and Host: Faculty of Mathematics and Informatics, St. Cyril and St. Methodius University of Veliko Tarnovo Co-organizers: Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences University of Vienna Section University of Veliko Tarnovo at the Union of Bulgarian Mathematicians Scientific Fields Mathematical analysis, Geometry and Applications Discrete Structures Computer Science Education in Mathematics and Informatics Important Deadlines 1.10.2024 - Submission of proposals for Special Sessions 1.11.2024 - Registration of talks and abstract submission (one participant can present up to two talks) 15.11.2024 - Registration without a talk. For further information [...]

National Seminar on Inquiry-based Mathematics Education

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

The National Seminar on Inquiry-based Mathematics Education will be held on November 29 - 30, 2024. Program For more information please visit : http://www.math.bas.bg/omi/nso/

Annual Scientific Session of the SofTIS Department

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

The Annual Scientific Session of the Software Technology and Information Systems Department will be held on December 3, 2024 (Thursday) at 11:00 am in Room 278 of IMI - BAS. PROGRAM

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 [...]

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