On June 1st, 2026 (Monday) at 2:15 pm in room 503 of IMI-BAS a joint meeting will be held of the Operations Research, Probability and Statistics Seminar of IMI-BAS and the Optimization Seminar of the Faculty of Mathematics and Informatics, Sofia University. A talk on: On the subregularity of mappings associated to optimization problems will be delivered by Alberto Dominguez Corella, University of Graz, Austria. Abstract: This talk is meant as a nontechnical discussion on the concept of metric subregularity and its application to the study of stability in optimization problems. It features equivalences between the property and local error bounds, as well as theoretical applications, e.g., discretization, approximation, and differentiation with respect to parameters. We describe several concrete applications, including inverse problems and optimal control. [...]
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ICMS Distinguished Lecture series in Representation Theory and Mathematical Physics Date and place: May 19 and 21, 2026 (15:00–16:00 Sofia time) and June 1, 3 and 5, 2026 (16:00–17:00 Sofia time), Room 403, IMI - BAS Lecturer: Ivan Dimitrov (Queen’s University, Canada) Title: Root systems, generalizations and applications Root systems were introduced by Wilhelm Killing in 1889 as a tool for classifying Lie algebras. Since then, they have become ubiquitous, appearing in various contexts in seemingly unrelated areas of Mathematics. In this lecture series, Ivan Dimitrov introduces and studies root systems and defines a generalization of root systems. He explains how this more general structure applies to various problems, e.g. hyperplane arrangements. Finally, he introduces and studies inversion sets of roots. The exposition is [...] |
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Date and time: Tuesday, June 2-nd, 2026, 13:00, room 403 IMI-BAS Lecturer: Bogdan Djordjevic, (Serbian Academy of Arts and Sciences, visitor at ICMS, IMI-BAS) Title: Application of the Laplace transform for evaluating sums of hyperharmonic-like series in Banach algebras and modules Abstract: In this talk it will be shown how the Laplace transform (in respective Banach spaces) can be utilized for evaluating sums of Banach-space-valued series. We demonstrate the technique on various abstract generalizations of the numerical hyperharmonic series, including noncommutative setting and non-invertible setting. As an application, we obtain new necessary consistency condition for the Sylvester equation ax-xb=c. |
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ICMS Distinguished Lecture series in Representation Theory and Mathematical Physics Date and place: May 19 and 21, 2026 (15:00–16:00 Sofia time) and June 1, 3 and 5, 2026 (16:00–17:00 Sofia time), Room 403, IMI - BAS Lecturer: Ivan Dimitrov (Queen’s University, Canada) Title: Root systems, generalizations and applications Root systems were introduced by Wilhelm Killing in 1889 as a tool for classifying Lie algebras. Since then, they have become ubiquitous, appearing in various contexts in seemingly unrelated areas of Mathematics. In this lecture series, Ivan Dimitrov introduces and studies root systems and defines a generalization of root systems. He explains how this more general structure applies to various problems, e.g. hyperplane arrangements. Finally, he introduces and studies inversion sets of roots. The exposition is [...] |
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ICMS Distinguished Lecture series in Representation Theory and Mathematical Physics Date and place: May 19 and 21, 2026 (15:00–16:00 Sofia time) and June 1, 3 and 5, 2026 (16:00–17:00 Sofia time), Room 403, IMI - BAS Lecturer: Ivan Dimitrov (Queen’s University, Canada) Title: Root systems, generalizations and applications Root systems were introduced by Wilhelm Killing in 1889 as a tool for classifying Lie algebras. Since then, they have become ubiquitous, appearing in various contexts in seemingly unrelated areas of Mathematics. In this lecture series, Ivan Dimitrov introduces and studies root systems and defines a generalization of root systems. He explains how this more general structure applies to various problems, e.g. hyperplane arrangements. Finally, he introduces and studies inversion sets of roots. The exposition is [...] |
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Time and place: вторник, 9 юни 2026 г., 13:00, зала 403, ИМИ-БАН. Lecturer: Azur Đonlagić (Université Paris-Saclay Title: Brauer-Manin Obstructions for Homogeneous Spaces Abstract: In this talk, we introduce Brauer-Manin obstructions to the Hasse principle and to weak/strong approximation of adelic points on varieties over a global field. We also define variants of these obstructions well-suited for the study of rational points on homogeneous spaces of affine algebraic groups. We then state the main questions considered in this theory and give an account of some developments, including the speaker's recent work. Finally, we present briefly the main tools and ideas used in the theory, such as arithmetic duality theorems, highlighting the difficulties which appear in positive characteristic. More information can be found on the seminar's [...]
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The next meeting of the National Seminar on Probability and Statistics will be held on June 9, 2026, at 2:00 p.m. in Room 503 of the Institute of Mathematics and Informatics. A talk on: Modified percolation models on lattice graphs will be delivered by Viktor Stoyanov (University of Warwick). Abstract: We consider modified percolation models on the first quadrant of Z^2, where many of the key tools from standard percolation on Z^2 fail, such as translational invariance. I will begin by defining the standard percolation model on Z^d, giving an overview of what is known, and then give some results which we prove for the first quadrant of Z^2. In the second part of the talk, I will discuss an anisotropic percolation model on [...]
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On 09.06.2026 at 15:30 in hall 256, the seminar "Digital Culture" of the "Mathematical Linguistics" section will be held. Assoc. Prof. Dr. Maxim Goynov will deliver an inauguration lecture on Flexible architecture of digital cultural content management systems. |
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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 17, 2026 (Wednesday) at 4:15 pm EET in the Conference Room of IMI - BAS. A talk on: Gerd Faltings: From the Mordell Conjecture to the Abel Prize will be delivered by Dr. Alexandros Konstantinou, ICMS, Institute of Mathematics and Informatics, Bulgarian Academy of Sciences. Abstract. Faltings’ proof of the Mordell conjecture is one of the landmark results of twentieth-century mathematics. It states that a smooth projective curve of genus at least 2 over the rationals has only finitely many rational points. For this work, Faltings received the Fields Medal in 1986. In 2026 [...] |
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The next meeting of the Algebra and Logic Seminar will take place on June 19, 2026 (Friday) at 1:00 pm (UTC+3) in Room 578 and online via Zoom. A talk on: Varieties of left-commutative algebras will be delivered by Bekzat Zhakhayev (SDU University and Institute of Mathematics and Mathematical Modeling, Almaty, Kazakhstan). (joint work with V. Drensky and V. Dotsenko) Abstract. An algebra A = (A, ・) is called a left-commutative algebra if it satisfies the identity a ・ (b ・ c) − b ・ (a ・ c) = 0 for all elements a, b, c ∈ A. We consider two subvarieties of the variety of left-commutative algebras, namely the varieties of Novikov algebras and bicommutative algebras. In 1976 Bokut formulated the following question: to describe, in terms of identities, varieties [...] |
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We are delighted to invite you to take part in the round table on: Practices of Open and Responsible Research in the Academic Lifecycle: Opportunities for Including Altmetrics in Research Assessment Date: July 2, 2026 Time: 2:30 – 4:30 pm Place: Institute of Mathematics and Informatics, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Block 8, Sofia; Room 256 Language: English Participation is free, preliminary registration is required. Registration until June 28, 2026 This round table will bring together researchers, librarians, and experts in open science, responsible research practice, scholarly communication and research assessment. We will discuss how open and responsible research practices can be embedded across the academic lifecycle - from planning and data management to publication, visibility, reuse and evaluation. Emphasis will [...] |
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