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Seminar of the Information Modelling Department

Zoom

The next meeting of the seminar of the Information Modelling Department will be held on May 31, 2022, Tuesday, at 2:00 pm (UCT+3). Assoc. Prof. Oksana Kharchenko from the Department of Media Engineering and Information Radio Electronic Systems of Kharkiv National University of Radio Electronics, Ukraine will deliver a talk on IDENTIFICATION AND VISUALIZATION OF ELECTROENCEPHALOGRAM INFORMATIONAL CHARACTERISTICS.  Abstract: Nowadays the numerical methods of EEG analysis (in main, spectral and correlation analysis) are finding ever increasing application. An advantage of these methods consists in the elimination of subjectivity, being inevitable for a visual analysis. It is important for the clinical neurophysiologist to know when this or that rhythm appeared. But spectral analysis does not show the change in the signal over time. This disadvantage partially [...]

Didactical Modeling Seminar

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

The next meeting of the Didactical Modelling Seminar will be held on June 6, 2022, at 2:30 pm (UTC+3) in Room 278 of IMI-BAS and online in Zoom. A talk on Prerequisites and preparation for the implementation of an integrated approach model in 125th High School will be delivered by Eng. Stefana Petrova. Join Zoom Meeting https://us02web.zoom.us/j/82520858333?pwd=d1lVcGpOS29zTU1qb0N6d0U4VGpMUT09 Meeting ID: 825 2085 8333 Passcode: 436390

Seminar of the Information Modelling Department

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

The next meeting of the seminar of the Information Modelling Department will be held on June 7, 2022, Tuesday, at 2:00 pm (UCT+3) in Room 278 of the Institute of Mathematics and Informatics - BAS. Assoc. Prof. Rumen Dimitrov will deliver a talk on Application of NGS technology for analysis of pathogen-host interactions.  Annotation: C. glabrata is an opportunistic fungal pathogen. Its clinical isolates show great genomic plasticity. This allows C. glabrata to adapt to different niches of the host by changing the number and size of chromosomes and by rearranging its genome.  At the first stage of the project КР-06-31/19 one of the main tasks is the sequencing and annotation of a strain of C.glabrata isolated from an ecological niche. The aim is to [...]

Seminar of the Department of Mathematical Foundations of Informatics

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

On June 10, 2022 (Friday) at 1:00 pm in the Conference Room of IMI a meeting of the seminar of the department of Mathematical Foundations of Informatics  will be held. A talk on: Sperner’s Theorem, Voting Theory, Balancing the Graph System, Strong and Weak Subsets of the Multiset will be given by Stepan Tarasenko, Kiev Polytechnic Institute, regarding his enrollment in the PhD program.   For online participation (Zoom): https://us02web.zoom.us/j/84701255174?pwd=bnVQV290cExnS2p3RVpRZDdWdFlBUT09 Meeting ID: 847 0125 5174, Passcode: 896181

Seminar of the Department of Mathematical Foundations of Informatics

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

On June 10, 2022 (Friday) at 2:00 pm (UTC+3) in the Conference Room of IMI, the pre-defense will take place of the PhD thesis in the professional division 4.5. Mathematics, scientific field: 01.01.02. Algebra and number theory, of Pascal Nikolaev Piperkov PhD student in the MOI Department of IMI-BAS Dissertation topic: Discrete transformations and their application in the coding theory and combinatorics Scientific adviser: Prof. Dr. Iliya Buyukliev For online participation (Zoom): https://us02web.zoom.us/j/84701255174?pwd=bnVQV290cExnS2p3RVpRZDdWdFlBUT09 Meeting ID: 847 0125 5174, Passcode: 896181

Algebra and Logic Seminar

Zoom

An online session of the Algebra and Logic Seminar will be held on June 10, 2022 (Friday) at 4:00 pm (UTC+3). A talk on: Computing Eigenvectors of Symmetric Tridiagonals with the Correct Number of Sign Changes will be delivered by Plamen Koev (San José State University, USA). Abstract. The symmetric tridiagonal eigenvector problem has been a central research topic in numerical linear algebra since its inception. Of the myriad of algorithms today, none is provably optimal and accurate at the same time. “Optimal” means, a subset of k eigenvectors is computed in O(kn) time. “Accurate” means that the computes eigenvectors are orthogonal and satisfy the typical relative gap error bound. In this talk, we focus our attention on a neglected oscillating property of the eigenvectors: [...]

9th CMAPT Workshop – Computational Mathematics and APproximation Theory

Strobl/St. Wolfgang, Austria

9th CMAPT Workshop (Computational Mathematics and APproximation Theory) http://www.numa.uni-linz.ac.at/CMAPT/2022/ 13 - 17 June 2022, Strobl/St. Wolfgang, Austria organized by Doctoral Program Numerical Analysis and Symbolic Computation, Johannes Kepler University, Linz, Austria Johann Radon Institute for Computational and Applied Mathematics (RICAM), Austrian Academy of Sciences, Linz, Austria Institute of Computational Mathematics (NuMa), Johannes Kepler University, Linz, Austria Institute of Mathematics and Informatics (IMI), Bulgarian Academy of Sciences, Sofia, Bulgaria Topics and Goal The primary objective of the CMAPT Workshop (to be pronounced: smart) is to bring together scientists from Bulgaria and Austria working in the fields of Approximation Theory, Numerical Analysis, Symbolic Computation and CAGD. Among the goals of the workshop is the stimulation of new research cooperations which would lead to novel results. We [...]

ICMS-Sofia: Second 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 – Sofia is organizing for a second consecutive year a meeting of young Bulgarian mathematicians from around the world.

Lecture by Prof. Yuri Tschinkel

Хотел Интерконтинентал София пл. Народно събрание 4, София

The lecture is named Building Scientific Institutes. Prof. Tschinkel will share his experience of how private capital helps fund research in various fields.

Ninth international conference New trends in the applications of differential equations in sciences (NTADES2022)

Созопол, България

Ninth international conference New trends in the applications of differential equations in sciences (NTADES2022) Ninth international conference New trends in the applications of differential equations in sciences (NTADES2022) will held from 14-17 June, 2022 in Sozopol, Bulgaria. It is in cooperation with Society of Industrial and Applied Mathematics (SIAM). The main topics are: Applications in Mathematical Physics; Applications in Nonlinear Waves; Applications in Financial Mathematics; Applications in Mechanics; Applications in Fractional analysis; Applications in Biology; Applications in Neurosciences. More information can be found on the web site of the conference www.ntades.eu The proceedings will be published in American Institute of Physics Conference Proceedings (https://www.aip.org/) which have Scopus Journal Rang.

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 15, 2022, at 2:00 p.m. (UTC +3) in Room 503 of the Institute of Mathematics and Informatics. A talk on: Tests of stochastic dominance with repeated measurements data will be delivered by Angel Angelov (Faculty of Mathematics and Informatics, Sofia University). Abstract: We explore a testing problem which involves four hypotheses, i.e., based on observations of two random variables X and Y, we wish to discriminate between four possibilities: identical survival functions, stochastic dominance of X over Y, stochastic dominance of Y over X, or crossing survival functions. Four-decision testing procedures for repeated measurements data are proposed. The tests are based on a permutation approach and do not [...]

Differential Equations and Mathematical Physics Seminar

Zoom

 The next meeting of the seminar on Differential Equations and Mathematical Physics will be held online on June 22, 2022, at 2 p.m. (UTC+3). A talk on On Contact Defects in Reaction-Diffusion Systems will be delivered by Dr. Milen Ivanov. Abstract: Solutions of reaction-diffusion systems exhibit a wide variety of patterns like spirals, stripes and Turing patterns. In particular, the Belousov-Zhabotinsky (BZ) reaction produces spiral patterns, which may undergo a period-doubling bifurcation; then a line defect is emitted from the center of the spiral and along it the pattern jumps half a period. In order to study this phenomenon, we consider the so-called contact defects, studied by Sandstede and Scheel: functions, which converge (in an appropriate sense) to a periodic function as x→±∞. Of [...]

Algebra and Logic Seminar

Zoom

An online session of the Algebra and Logic Seminar will be held on June 24, 2022 (Friday) at 1:00 pm (UTC+3). A talk on: Dependent-Type Theory of Situated Information with Context Assessments will be delivered by Roussanka Loukanova. Abstract. I shall introduce an enriched formal language of information that establishes propositions dependent on situations and types. The types can be basic or complex. Complex propositional types are defined recursively. The language supports structured data of situated information, which can be partial, parametric, and underspecified. Information can be associated with quantitative evaluations depending on situations. The formal terms can integrate propositional types of situated information with statistical and other quantitative evaluations. Structured content integrated with quantitative data facilitates development of new techniques for amalgamating logic representation [...]

Preliminary defense of the dissertation of Emilia Bazhlekova for awarding the degree “Doctor of Science”

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

On June 28, 2022 (Tuesday), at 1:00 pm in Room 478 of IMI-BAS, a preliminary defense will be held of the dissertation of Emilia Bazhlekova on: Subordination principle for generalized fractional evolution equations for awarding of the degree “Doctor of Science” in the area 4.5. Mathematics, scientific field “Mathematical analysis”. The dissertation can be found in the Library of IMI-BAS.   Department “Analysis, Geometry and Topology”

Colloquium talk by Prof. Ljudmila Kamenova

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 Bulgarian Academy of Sciences presents ICMS Colloquium June 28, 2022, 2:00 pm (EEST, Sofia time) IMI-BAS, Hall 403 Ludmila Kamenova Stony Brook University Finiteness results for hyperkaehler manifolds In this talk we are going to show that there are finitely many deformation types of hyperkaehler manifolds with fixed topological invariants such as the Fujiki constant and the discriminant of the BBF form. For hyperkaehler manifolds that admit a fibration structure it is enough to fix the degree of the polarization on the general fiber in order to obtain a finiteness result.  

Seminar of the Department of Mathematical Foundations of Informatics

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

The next meeting of the seminar will be held on June 28, 2022, at 2:00 pm (UTC+3) in Room 503 with the following schedule: 2:00-2:30 pm Miroslav Markov “Point-counting on elliptic curves" 2:30-3:15 pm Navid Safaei "Spherical designs with few distances" 3:15-3:30 pm Coffee break 3:30-4:15 pm Stepan Tarasenko "Sperner‘s Theorem, Voting Theory, Balancing the Graph System, Strong and Weak Subsets of the Multiset" Everybody is invited. Link for online participation: https://teams.live.com/meet/9448198083354

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 29, 2022, at 2:00 p.m. (UTC +3) in Room 503 of the Institute of Mathematics and Informatics. A talk on: Modelling longitudinal cognitive test data with ceiling effects and left skewness will be delivered by Denitsa Grigorova (Faculty of Mathematics and Informatics, Sofia University), a joint work with Deyan Palezhev and Ralitsa Georgieva. Abstract: Cognitive tests are among the markers for the development of cognitive diseases such as Alzheimer’s disease. We model the scores from the Mini Mental State Examination (MMSE) over time on data from the Alzheimer’s Disease Neuroimaging Initiative studies (ADNI, http://adni.loni.usc.edu/). The challenge of modelling such an outcome is that the data are left-skewed with [...]

Algebra and Logic Seminar

Zoom

An online session of the Algebra and Logic Seminar will be held on July 1, 2022 (Friday) at 1:00 pm (UTC+3). A talk on: On the parity of the coefficients of minimal polynomial of Kloosterman sums over Fp will be delivered by Lyubomir Borisov. Abstract. Kloosterman sums over finite fields play an important role in "Algebraic Coding Theory" and "Cryptography". E.g., they are related to some families of algebraic codes (Melas, Kloosterman) and (hyper-)bent functions. Particularly, the divisibility properties of some quantities connected with the Kloosterman sums, e.g., of minimal polynomial coefficients and power moments, were also investigated (see, e.g., [1]; [2]). In this talk I shall present some results about the divisibility by 2 of the coefficients of minimal polynomials of the Kloosterman sums. [...]

Mathematical Foundations of Informatics Seminar, a talk by Prof. Alexander Barg

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

The next meeting of the Mathematical Foundations of Mathematics Seminar will be held on July 5th, 2022, at 2:00 pm (UTC+3) in the Conference Room of IMI-BAS. Prof. Alexander Barg from the University of Maryland will deliver a lecture on Remarks on the 1st linear programming bound for binary codes Abstract: The "linear programming bound" on the rate of binary codes (1977) is a fundamental result in coding theory that continues to attract attention to this day, with new proofs appearing every now and then. I will discuss 2 proofs from about 2006-08, appearing in arXiv:cs/0512025 (Barg-Nogin) and arXiv:math/0702425 (Navon and Samorodnitsky). Both proofs are based on Fourier analytic arguments on the Boolean cube and exhibit interesting parallels and differences (none of them actually [...]

ICMS: Edging Higher – Inaugural Conference

Grand Hotel Sofia ul. Gen. Y. V. Gurko 1, 1000 Sofia Center, Sofia

This conference will serve as a unique opportunity for the consolidation of our efforts and lifting our activities to the next level.

Defense of the PhD thesis of Georgi Simeonov

Zoom

The Institute of Mathematics and Informatics of BAS and the Scientific Board for the awarding of PhD degree hereby announce that on July 13, 2022, at 4:00 p.m., a Zoom meeting of the Scientific Board will be held for the defense of the doctoral dissertation on: Modeling and analyzing big data for the COVID-19 outbreak of Georgi Simeonov Simeonov   Higher Education Field 4. Science, Mathematics and Informatics, Professional field 4.6. Informatics and Computer Science, PhD program “Informatics” Research Advisor: Prof. Peter Stanchev, D. Sc. Chairman of the Scientific Board: Assoc. Prof. Alexander Iliev, PhD Members of the Scientific Board: Prof. Peter Stanchev, D. Sc. Prof. Boyan Bonchev, PhD Prof. Radoslav Yoshinov, PhD Prof. Rumen Nikolov, PhD Join Zoom Meeting https://us02web.zoom.us/j/85077341962?pwd=iDXJrNmsmmZ53mOpBkZaTIetxbv9Ol.1 The documents related [...]

ICMS-Sofia: Conference on Geometry and Physics

Hotel Riu Palace, Sunny Beach, Bulgaria Sunny Beach

Conference on Geometry and Physics The goal of this conference is to consolidate and disseminate new developments in Geometry and Physics. The list of participants includes: Maxim Kontsevich, Institut des Hautes Études Scientifiques, France, Phillip Griffiths, Institute for Advanced Study, Karim Adiprasito, University of Copenhagen, Denmark, Vivek Shende, Centre for Quantum Mathematics, Syddansk Universitet, Denmark, Jørgen Ellegaard Andersen, University of Southern Denmark, Denmark, Oscar García-Prada, Instituto de Ciencias Matemáticas (ICMAT), Spain, Kenji Fukaya, Simons Center for Geometry and Physics at Stony Brook, USA, Mina Teicher, University of Miami, USA, Robert Stephen Cantrell, University of Miami, USA, Yong-Geon Oh, IBS Center for Geometry and Physics, Korea, Ernesto Lupercio, Cinvestav-IPN, México, Tony Pantev, University of Pennsylvania, USA, Ludmil Katzarkov, University of Miami, USA and Institute of Mathematics and Informatics, Bulgaria, Meral Tosun, Galatasaray University, Turkey, Dennis Borisov, University of Windsor, Canada, Artan Sheshmani, [...]

9th Congress of the WFNMC

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

9th Congress of the World Federation of National Mathematics Competitions July 19 - 25, 2022, Sofia, Bulgaria The 9th Congress of the World Federation of National Mathematics Competitions will be held in Sofia, Bulgaria, in July 2022. It will be co-organized and hosted by the Institute of Mathematics and Informatics. The program of the Congress will include talks, workshops, mini-courses, problem posing sessions, plenary talks, and other events. Much of the Congress’ work will center on the following four themes: Building Bridges between Problems of Mathematical Research and Competitions (chaired by Alexander Soifer); Creating Problems and Problem Solving (chaired by Krzysztof Ciesielski); Competitions around the World (chaired by Maria Losada); Technological Applications in Mathematics Competitions (chaired by Lukas Donner). Participants are invited to submit [...]

22nd Summer Research School in Mathematics and Informatics

Творчески дом на БАН, Варна Варна, к.к. “Чайка”, спирка “Журналист”, Varna

SRS is a summer research school for high achieving teenagers with pronounced interests in the fields of mathematics, informatics (computer science) and ICT. It combines the best practices from leading programs for high school students in the field, such as RSI (organized by CEE and MIT), with the unique opportunities of a dynamic small-scale learning environment.

Algebra and Logic Seminar

Zoom

An online session of the Algebra and Logic Seminar will be held on July 29, 2022 (Friday) at 1:00 pm (UTC+3). A talk on: Modal Descriptive Complexity will be delivered by Petar Iliev (IPS-BAS and IMI-BAS, Bulgaria). Abstract.  The study of the descriptive complexity of a class of structures S relative to a class of formulae F from a logic L revolves around the question: what can we say about the definability of S with formulae from F? For example, we might want to know whether there is a formula from F defining S or, if not, whether there is a countably infinite sequence of F-formulae such that each formula from the sequence defines a subset of S and the union of all these [...]

Algebra and Logic Seminar

Zoom

An online session of the Algebra and Logic Seminar will be held on August 19, 2022 (Friday) at 1:00 pm (UTC+3). A talk on: Examples of non-reduced components of the Hilbert Scheme of smooth projective curves using ruled surfaces will be delivered by Hristo Iliev (American University in Bulgaria and IMI-BAS, Bulgaria). Abstract. Let Id,g,r be the union of irreducible components of the Hilbert scheme whose general points represent smooth irreducible non-degenerate curves of degree d and genus g in Pr. Using a family of curves found on ruled surfaces over smooth curves of genus γ, we show that for γ ≥ 7 and g ≥ 6γ+5 the scheme I2g−4γ+1,g,g−3γ+1 acquires a non-reduced component D′ such that dim T[X′]D′ = dimD′ + 1 for [...]

Tenth International Conference on Numerical Methods and Applications

Borovets, Bulgaria Borovets

The 10th International Conference onNumerical Methods and Applications NM&A'22 August 22 - 26, 2022, Borovets, Bulgaria is organized by Institute of Mathematics and Informatics, Bulgarian Academy of Sciences, in cooperation with Institute of Information and Communication Technologies, Bulgarian Academy of Sciences, Faculty of Mathematics and Informatics, Sofia University "St. Kliment Ohridski", Bulgarian Section of the Society for Industrial and Applied Mathematics (BGSIAM) For detailed information please visit the conference website: http://www.math.bas.bg/~nummeth/nma22/index.html

Algebra and Logic Seminar

Zoom

An online session of the Algebra and Logic Seminar will be held on September 9, 2022 (Friday) at 1:00 pm (UTC+3). A talk on: Timing delays in cyber-physical systems will be delivered by Naijun Zhan (Institute of Software Chinese Academy of Sciences ISCAS, China). Abstract. With the rapid development of feedback control, sensor techniques and computer control, time delay has become an essential feature of cyber-physical systems (CPSs), underlying both the continuous evolution of physical plants and the discrete transition of computer programs, which may well annihilate the stability/safety certificate and control performance of CPSs. In the safety-critical context, automatic verification and synthesis methods addressing time-delay in CPSs should therefore abound. However, surprisingly, they do not, although time-delay has been extensively studied in the [...]

Algebra and Logic Seminar

Zoom

An online session of the Algebra and Logic Seminar will be held on September 16, 2022 (Friday) at 2:00 pm (UTC+3). A talk on: Almost Prime Ideal and Almost Prime Radical will be delivered by Alaa Abouhalaka (Çukurova University, Adana, Turkey). Abstract. In this talk, we introduce the concept of almost prime (right) ideals in noncommutative rings and provide some equivalent definitions and new results. Also we introduce the concept of almost prime radical of an ideal. References: [1] M.S. Bhatwadekar, P. K. Sharma, Unique factorization and birth of almost primes, Comm. Algebra, 33(1), 43-49, (2005). [2] W.D. Blair, H. Tsutsui, Fully prime rings, Comm. Algebra, 22(13), 5389-5400, (1994).   Join Zoom meeting: https://us02web.zoom.us/j/85137375021?pwd=RE5QczdFTE1xL1R6MnI2b1lkcGczQT09 Topic: Онлайн семинар на секция "Алгебра и логика" Time: Sep 16, [...]

Defense of the PhD thesis of Pascal Piperkov

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 September 19, 2022, at 10:00 a.m., an open meeting of the Scientific Board will be held at IMI - BAS for the defense of the doctoral dissertation on: Discrete transformations and their application in coding theory and combinatorics of Pascal Nikolaev Piperkov Higher Education Field 4. Science, Mathematics and Informatics, Professional field 4.5. Mathematics, PhD program “Algebra and number theory” Research Advisor: Prof. Iliya Buyukliev, D.Sc. Chairman of the Scientific Board: Prof. Peter Boyvalenkov, D.Sc. Members of the Scientific Board: Prof. Nikolay Yankov, D.Sc. Prof. Iliya Buyukliev, D.Sc. Prof. Maya Stoyanova, PhD Assoc. Prof. Slavcho Shtrakov, D.Sc. The documents related to the [...]

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 September 19, 2022, at 2 p.m. (UTC+2) in the Conference Room of the Institute of Mathematics and Informatics. A talk on On the minimal sum of edges in a signed edge-dominated graph will be delivered by Danila Cherkashin. Abstract Everybody is invited.  

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 September 23, 2022 (Friday) at 1:00 pm (UTC+2) in Room 578 of IMI - BAS. A talk on: Geometry and logic in quantum computations will be delivered by Nikolay M. Nikolov (INRNE - BAS). Abstract. In 1936, Garrett Birkhoff and John Von Neumann published one of the most general axiomatic foundations of Quantum Theory, which has become known to this day as "Quantum Logic" (Annals of Mathematics, vol. 37 (1936) 823-843). In this work, they start from an ortho-modular lattice that serves as a model of the partially ordered set of all quantum events. They also found a connection with Projective Geometry. The main case of geometries is on complex numbers, but [...]

Twelfth International Conference on Digital Presentation and Preservation of Cultural and Scientific Heritage—DiPP2022

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

The Twelfth International Conference on Digital Presentation and Preservation of Cultural and Scientific Heritage—DiPP2022 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.

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 September 27, 2022, at 2 p.m. (UTC+2) in the Conference Room of the Institute of Mathematics and Informatics. A talk on Tightening the Generalized Levenshtein Bound (GLB) on Aperiodic Correlation of Quasi-Complementary Sequence Sets will be delivered by Dr Zilong Liu from the University of Essex. Dr. Liu's visit is carried out under the PIKOM program. The report will also be available via zoom, at the link https://us02web.zoom.us/j/82208909334?pwd=VkxhSzdNYmpWdGdjNnZySFpQSUxTZz09 Abstract: Levenshtein improved the aperiodic Welch bound by using the key idea that the weighted mean square aperiodic correlation of any sequence subsets over the complex roots of unity is equal to or greater than that of the set comprised of all sequences [...]

ICMS Seminar

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

The next meeting of the Seminar of the International Center for Mathematical Sciences (IMCS) will be held on September 27, 2022, at 4 pm (UTC+2) in Room 403 of IMI - BAS. A talk on: Singularities: Resolutions and Valuations will be delivered by Dr. Andrei Benguş-Lasnier (Paris). For more information please visit https://icms.bg/singularities-resolutions-and-valuations-talk-by-andrei-bengus-lasnier/.

Digital Culture Seminar

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

A meeting of the Digital Culture Seminar (organized by the Mathematical Linguistics Department) will be held on September 28, 2022, in the Conference Room of IMI - BAS, at which Assoc. Prof. Dr. Ivan Georgiev will deliver a talk and will present results regarding KLADA-BG: Ivan Georgiev, Hristina Klecherova, Georgi Vasilev. 3D digitization and presentation of digital content Everybody is invited. Topic: Семинар “Дигитална култура” Time: Sep 28, 2022 13:45 Sofia Join Zoom Meeting https://us02web.zoom.us/j/84786030076?pwd=bHQ0L1hxdjlFTjdqNEoyc3FMS0dvZz09 Meeting ID: 847 8603 0076 Passcode: 138166  

Mathematical Modelling and Numerial Analysis Seminar

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

The next meeting of the seminar of the Department of Mathematical Modeling and Numerical Analysis will be held on October 3, 2022, at 2:00 pm (UTC+2) in Room 403 of the Institute of Mathematics and Informatics. A talk on: Mathematical modeling and computer simulations of Physics and Josephson Contact problems will be delivered by Dr. Stefani Panayotova, Plovdiv University.  

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 10, 2022, at 2:30 p.m. in Room 278 of IMI - BAS. A talk on Recurrent sequences and applications to probability problems - the teaching experience at the American College of Sofia will be delivered by Dr. Borislava Videnova.

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 October 14, 2022 (Friday) at 1:00 pm (UTC+2) in Room 578 of IMI - BAS and online in Zoom. A talk on: Families of triple coverings of algebraic curves will be delivered by Hristo Iliev (American University in Bulgaria and IMI - BAS). Abstract. The talk is a continuation of my previous talk "Examples of non-reduced components of the Hilbert scheme of smooth projective curves using ruled surfaces" that I gave on August 19, 2022. In the present talk we consider curves that are triple covers of smooth projective curves of genus γ ≥ 0. We obtain families of curves on smooth surface scrolls which, under suitable numerical assumptions, yield components of [...]

Preliminary defense of Detelina Kamburova

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

On October 18, 2022 (Tuesday) at 2 p.m. in room 503 of IMI-BAS, the pre-defense will be held of the dissertation of Detelina Kirilova Kamburova, full-time doctoral student at the Operation Research, Probability and Statistics Department of IMI-BAS, with academic supervisor Acad. Julian Revalski, for obtaining the educational and scientific degree "Doctor" in the PhD program Operations Research. The materials for the dissertation are available in the IMI library.

Algebra and Logic Seminar

Zoom

The next meeting of the Algebra and Logic Seminar will be held on October 21, 2022 (Friday) at 1:00 pm (UTC+2) online in Zoom. A talk on: Ranks and Presentations for Order-Preserving Transformations with One Fixed Point will be delivered by Jörg Koppitz (joint work with S. Worawiset). Abstract. We consider the semigroup (no monoid) of all order-preserving full transformations α on an n-element chain Xn = {1 < 2 …< n}, where p is the only fixed point in α, for some given p ∈Xn, denoted by On,p. This semigroup is nilpotent. In particular, the semigroup On,1 (i.e. p = 1) is already well studied, since it is the maximal nilpotent subsemigroup of the Catalan monoid. But the semigroup On,p is still not well [...]

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 24, 2022, at 2:30 p.m. in Room 278 of IMI - BAS. A talk on Problem development sessions during the WFNMC Congress will be delivered by Assoc. Prof. Ivaylo Kortezov.

Seminar of the Operations Research, Probability and Statistics Department

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

The next meeting of the seminar of the Department of Operations Research, Probability and Statistics will be held on October 25th, 2022, at 2:00 p.m. (UTC+3). Dragomir Nedelchev, a doctoral student, will deliver a talk on: Value-at-Risk, Expected Shortfall, and expectile-based risk measure. Abstract. The financial markets dynamics entails challenges for measuring the market risk. Hence, the agenda of both the market makers and regulators (like the Basel Committee on Bank Supervision) includes challenging and upgrading the market risk measure. Stakeholders have to reach a common understanding on the pros / cons of the available risk measures, and if necessary - design new measures.   Traditionally, the market risk is measured via the Value-at-Risk (VaR). Although marked with substantial advantages, the VaR does not [...]

Seminar on Applications of Differential Applications in Sciences

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

The seminar on Applications of Differential Equations in Sciences will be held on October 26, 2022 at 2:00 p.m. in Room 478 of IMI - BAS. Acad. Petar Popivanov will deliver a talk on AN APPLICATION OF MICROLOCAL ANALYSIS IN THE RELATIVITY THEORY ОТНОСИТЕЛНОСТТА (BLACK HOLES) Everybody is invited.

Algebra and Logic Seminar

Zoom

The next meeting of the Algebra and Logic Seminar will be held on October 21, 2022 (Friday) at 1:00 pm (UTC+2) online in Zoom. A talk on: Gabbay Separation for the Duration Calculus will be delivered by Dimitar Guelev (IMI - BAS). Abstract.  Gabbay's separation theorem about linear temporal logic (LTL) with past has proved to be one of the most useful theoretical results in temporal logic. Is expressive power ultimately affected, if past constructs are not allowed in the scope of future ones, or vice versa? Separation implies that it does not, and also provides a technically convenient normal form for temporal conditions. Interval Temporal Logic (ITL) and the Duration Calculus (DC) are interval-based logics. Unlike LTL, they are based on modalities which [...]

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 160th meeting of the National Mathematics Colloquium will be held on November 2, 2022 (Wednesday) at 4:15 pm EET (UTC +2) in the Conference Room of IMI - BAS. A talk on: Polyharmonic operators, boundary value problems and some applications in mathematical physics will be delivered by Acad. Peter Popivanov, Institute of Mathematics and Informatics, Bulgarian Academy of Sciences. The talk is dedicated to the International Year of Basic Sciences for Sustainable Development. Abstract Everybody is invited.

Mathematical Modelling and Numerial Analysis Seminar

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

The next meeting of the Department of Mathematical Modelling and Numerical Analysis will be held on November 7, 2022 (Monday) at 2:00 pm in Room 403 of the Institute of Mathematics and Informatics. A talk on: Mathematical modeling of bioprocesses with the use of fractional order derivatives will be delivered by Vladimira Suvandzhieva (doctoral student at the MMNA Department), in which she will present the results of her graduation thesis. Abstract: This work brings together two recently discussed topics: mathematical modeling of a bioreactor and working with derivatives of non-integer order. Generally, it turns out that it is reasonable to replace the integer order derivatives in some of the already well known mathematical models describing bioprocesses with fractional order ones. However, the specific structure [...]

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 7, 2022, at 2:30 pm in Room 278 of IMI - BAS. A talk on: Proofs using vectors in school mathematics will be delivered by Boyanka Savova.

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 November 8, 2022 at 1:30 pm (UTC+3)  in Room 478 of IMI. A talk on: Surfaces Associated with Pascal and Catalan Triangles  will be delivered by Leonard DAUS1, Marilena JIANU1 and Adela MIHAI1,2 1 Technical University of Civil Engineering Bucharest, Romania 2 Transilvania University of Brasov, Romania. Everybody is invited. Abstract. An open problem in reliability theory is that of finding all the coefficients of the reliability polynomial associated with particular networks. Because reliability polynomials can be expressed in Bernstein form (hence linked to binomial coefficients), it is clear that an extension of the classical discrete Pascal’s triangle (comprising all the binomial coefficients) to a continuous version [...]

Applied Mathematics Seminar

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

The first meeting of the newly established Applied Mathematics Seminar, which is part of the PICOM program, will be held on November 8, 2022, at 3:00 pm in Room 503 of IMI - BAS. A talk on: Solving optimization problems with quantum annealers will be delivered by Prof. Hristo Djidjev (IICT - BAS). 

National Seminar on Coding Theory “Acad. Stefan Dodunekov”

Парк-хотел "Севастократор, с. Арбанаси

The National Seminar on Coding Theory was founded in the 80s of the 20th century by Academician Stefan Dodunekov and since then has been held annually. Since 2014, the seminar has also been named after Academician Dodunekov, who was the director of the Institute of Mathematics and Informatics from 1999 to 2012 and the President of the Union of Mathematicians in Bulgaria from 2001 to 2012.

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 November 15, 2022 at 11:00 am (UTC+3)  in Room 478 of IMI. A talk on: Zener model with General fractional calculus: Thermodynamical Restrictions  will be delivered by Teodor M. Atanackovic and Stevan Pilipovic, Serbian Academy of Sciences and Arts and University of Novi Sad, Serbia. Everybody is invited. Abstract. We study a Zener type model of viscoelastic body within the context of general fractional calculus and derive restrictions on coefficients that follow from the dissipation inequality that is, the entropy inequality under isothermal conditions. We show, for a stress relaxation and a wave propagation, that the restrictions that follow from the entropy inequality are sufficient to guarantee the existence [...]

Defence of the D.Sc. dissertation of Emilia Bazhlekova

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 Doctor of Science scientific degree hereby announce that on November 15, 2022, at 2:00 p.m., an open meeting of the Scientific Board will be held in hybrid form at IMI – BAS, room 478, and in Zoom, for the defense of the dissertation on: Subordination principle for generalized fractional evolution equations of Emilia Grigorova Bazhlekova Higher education area 4. Natural sciences, mathematics and informatics, professional field 4.5. Mathematics, scientific specialty “Mathematical analysis” Chair of the Scientific Board: Prof. Jordanka Paneva-Konovska, D.Sc. Members of the Scientific Board: Prof. Virginia Kiryakova, D.Sc. Prof. Tsviatko Rangelov, D.Sc. Prof. Maria Datcheva, PhD Prof. Miglena Koleva, D.Sc. Prof. Georgi Venkov, PhD Prof. Krasimira [...]

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 160th meeting of the National Mathematics Colloquium will be held on November 16, 2022 (Wednesday) at 4:15 pm EET (UTC +2) in the Conference Room of IMI - BAS. A talk on: Counterexamples, paradoxes and surprises in mathematics will be delivered by Jordan Stoyanov, Institute of Mathematics and Informatics, Bulgarian Academy of Sciences, and Shandong University, Jinan, P. R. China. Everybody is invited. Join Zoom Meeting https://us02web.zoom.us/j/81214695960?pwd=cml0Yi9sYmRacUhERXdnQVhCWC9Tdz09 Meeting ID: 812 1469 5960 Passcode: 187153

Defense of the PhD thesis of Nektarios Moumoutzis

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 21, 2022, at 2:00 p.m., an open meeting of the Scientific Board will be held at IMI - BAS for the defense of the doctoral dissertation on: Operational Conceptual Modeling in Building and Sustaining Virtual Communities of Nektarios Moumoutzis Higher Education Field 4. Science, Mathematics and Informatics, Professional field 4.6. Informatics and Computer Science, PhD program “Informatics” Research Advisor: Prof. Radoslav Pavlov, PhD Chairman of the Scientific Board: Assoc. Prof. Detelin Luchev, PhD Members of the Scientific Board: Prof. Daniela Borisova, D.Sc. Prof. Maria Nisheva-Pavlova, PhD Prof. Krassen Stefanov, PhD Prof. Vladimir Monov, PhD The documents related to the defense are [...]

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 21, 2022, at 2:30 pm in Room 278 of IMI - BAS. A talk on: Vector calculations, proofs, constructions and a dynamic geometry variant will be delivered by Assoc. Prof. Boyko Banchev.

ICMS course in Algebraic Geometry

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

Dr. Andrey Bengus-Lasnier will deliver a series of lectures organized by ICMS (about 8 lectures) on: Introduction to Resolution of Singularities The course topic is fundamental to algebraic geometry. The course is accessible to mathematics students with a background in commutative algebra. The first lecture is on November 22 at 1:30 p.m. in room 403 of IMI-BAN. Course annotation You can see the first two lectures of Dr. Bengus-Lasnier here: https://www.youtube.com/playlist?list=PLeJfYzSLUQsBkZ9st_ZJ8OjT4deTeysQB https://youtu.be/h6TnwOY_qEM  

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 25 - 26, 2022. The program will be announced additionally. Registration deadline: November 13, 2022. Registration Form For more information please visit : http://www.math.bas.bg/omi/nso/

Mathematical Modeling and Numerial Analysis Seminar

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

The next meeting of the seminar of the Department of Mathematical Modeling and Numerical Analysis will be held on November 28, 2022, Monday, at 2:00 pm, in Room 403 of the Institute of Mathematics and Informatics. A talk on: Numerical solution of the two dimensional stationary Boussinesq Paradigm Equation will be delivered by Krasimir Angelov, in which he will present the results of his dissertation.  

Algebra and Logic Seminar

Zoom

The next meeting of the Algebra and Logic Seminar will be held on December 2, 2022 (Friday) at 1:00 pm (UTC+2) online in Zoom. A talk on: Derivations of upper triangular matrix rings vs Derivations of upper triangular matrix semirings will be delivered by Dimitrinka Vladeva (IMI - BAS). Abstract. The motivation for this talk is the problem how to represent a derivation of a matrix ring and of an additively idempotent matrix semiring as a sum of well-known derivations. The results of two of my articles, published in 2022, will be compared and we will draw conclusions about the advantages and disadvantages of these results. We begin by considering the nature of derivations of triangular matrices over an additively idempotent semiring R generated [...]

ICMS course in Algebraic Geometry

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

The third lecture in the course will be delivered on December 6, 2022, at 1:30 pm in Room 403 of IMI - BAS.   Dr. Andrey Bengus-Lasnier will deliver a series of lectures organized by ICMS (about 8 lectures) on: Introduction to Resolution of Singularities The course topic is fundamental to algebraic geometry. The course is accessible to mathematics students with a background in commutative algebra. Course annotation You can see the first two lectures of Dr. Bengus-Lasnier here: https://www.youtube.com/playlist?list=PLeJfYzSLUQsBkZ9st_ZJ8OjT4deTeysQB   https://youtu.be/h6TnwOY_qEM  

Applied Mathematics Seminar

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

The second meeting of the newly established Applied Mathematics Seminar, which is part of the PICOM program, will be held on December 7, 2022, at 3:00 pm in the Conference Room of IMI - BAS. A talk on: Introduction to Steiner Trees will be delivered by Dr. Danila Cherkashin, post-doctoral fellow at IMI - BAS.  Facebook page of the seminar: Семинар по Приложна математика

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

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

The initiative Women in Mathematics of South-Eastern Europe, aiming at promoting the role of female mathematicians, started in Dec 2020, when the inaugural conference took place. We intend to make these conferences annual.

Algebra and Logic Seminar, Lecture 3

Zoom

The next meeting of the Algebra and Logic Seminar will be held on December 9, 2022 (Friday) online in Zoom where two talks will be delivered. From 1:00 pm to 2:00 pm (UTC+2) a talk on: AdS/CFT Correspondence, Metropolis-Hastings algorithm and Generative Adversarial Networks will be delivered by Veselin Filev (IMI - BAS). Abstract. I will report on a recent publication on the construction of a backreacted D0/D4 background. I will discuss the relevance of this study in the AdS/CFT correspondence and the simulation of the Berkooz-Douglas matrix model. In the second part of the talk, I will review the Metropolis-Hastings algorithm and report on possible applications of the Generative Adversarial Networks (GANs) in the simulation of computationally expensive matrix models. From 2:00 pm [...]

Annual scientific session of the Mathematical Modeling and Numerical Analysis Department

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

The Annual Scientific Session of the Department of Mathematical Modeling and Numerical Analysis will be held on December 12, 2022, at 9:30 am in Room 403 of IMI - BAS. Program 9:30-9:50 Kamen Ivanov, The problem for Downward Continuation 9:50-10:10 Iliya Iliev, The limit cycles in a generalized Rayleigh-Liénard oscillator 10:10-10:30 Evgenija Popova, Regularity radius for matrices with rank-one interval parameters 10:30-10:45 Coffee break 10:45-11:05 Maya Mincheva, Delay stability of reaction networks 11:05-11:25 Peter Rashkov,  An optimal rapid action task in a vector-borne disease epidemic model with control constraints 11:25-11:45 Milen Borisov, Svetoslav Markov, The Exponential Decay and Outbreak Functions: Analysis and Numerical Simulation 11:45-12:00 Break 12:00-12:20 Ivan Bazhlekov, Generalized fractional bioreaction model and numerical approach. 12:20-12:40 Mihail Krastanov, On the Euler equation. 12:40-13:00 [...]

Workshop on the Horizon Europe Framework Programme

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

On December 5th and 12th (Monday) from 13:00 to 17:00 in Room 503, IMI-BAS will hold two-part workshop on the Horizon Europe framework programme with a specific focus on the calls of high importance for the institute. 05.12.2022 General Policies and Principles of the EU in Research and Innovation 12.12.2022 Horizon Europe and Successful Project Proposal Writing Lecturer will be Karina Angelieva, former deputy minister for education and science and former expert in the Bulgarian Permanent Representation in Brussels. Work language – English The workshop is organized under the K-TRIO project.

Annual Scientific Session of the International Center of Mathematical Sciences

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

The Annual Scientific Session of the International Center of Mathematical Sciences (ICMS) will be held on December 12, 2022, at 2:00 pm in Room 403 of IMI - BAS. Program 14:00-14:20 Oleg Mushkarov, ICMS activities in 2022 14:20-14:40 Rodolfo Aguilar, The nilpotent quotients of quasi-Kähler manifolds with proper quasi-albanese map 14:40-15:00 Антони Рангачев, Fujita-type theorem for the local volume of a line bundle 15:00 -15:10 Break 15:10 -15:30 Andrei Bengus-Lasnier, Geometric and combinatorial interpretations for valuations 15:30 - 15:50 Marin Genov, On the Jacobian conjecture in characteristic 0 for certain polynomial maps of degree 2 and 3 15:50 - 16:00 Break 16:00 - 16:20 Sebastien Torres, Semiorthogonal decompositions on moduli spaces 16:20 - 16:40 Danila Cherkashin, On stability of the spanning trees enumerator 16:40 - 17:00 Dimitar Kodjabachev, Picard [...]

Annual Scientific Session of the Information Modeling Department

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

The Annual Scientific Session of the Information Modeling Department will be held on December 13, 2022, Tuesday, at 9:00 am in Room 503 of IMI - BAS. PROGRAM Join Zoom Meeting https://us02web.zoom.us/j/86405941298?pwd=NEQreG9jc1BrOVRHeCsvVzZ3MHZkUT09 Meeting ID: 864 0594 1298 Passcode: 222430

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 department of Software Technology and Information Systems will be held on December 13, 2022, at 10:00 am in Room 278 of IMI - BAS. The session will be streamed (Zoom ID: 824 0371 8724, Passcode: 252058) and everybody is invited. PROGRAM

ICMS course in Algebraic Geometry, Lecture 4

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

The fourth lecture in the course will be delivered on December 13, 2022, at 1:30 pm in Room 403 of IMI - BAS.   Dr. Andrey Bengus-Lasnier will deliver a series of lectures organized by ICMS (about 8 lectures) on: Introduction to Resolution of Singularities The course topic is fundamental to algebraic geometry. The course is accessible to mathematics students with a background in commutative algebra. Course annotation You can see the first two lectures of Dr. Bengus-Lasnier here: https://www.youtube.com/playlist?list=PLeJfYzSLUQsBkZ9st_ZJ8OjT4deTeysQB   https://youtu.be/h6TnwOY_qEM  

Annual scientific session of the Algebra and Logic Department

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

The annual scientific session of the department of Algebra and Logic for 2022 will be held in hybrid format in Room 578 of IMI-BAS and in Zoom on December 16, 2022, at 9:55 am. PROGRAM Link to Zoom: https://us02web.zoom.us/j/85137375021?pwd=RE5QczdFTE1xL1R6MnI2b1lkcGczQT09  ================================== Everybody is invited. Algebra and Logic Department of IMI – BAS http://www.math.bas.bg/algebra/seminarAiL/

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 Department of Mathematical Modeling and Numerical Analysis will be held on December 19, 2022, Monday, at 2:00 pm in Room 403 of the Institute of Mathematics and Informatics, with the following program: 14:00-14:45 Krasimir Angelov, Numerical solution of the 2D unsteady Boussinesq Paradigm Equation 15:00-15:45 Galina Lyutskanova-Zhekova, Motion of long bubbles in gravity- and pressure-driven flow through cylindrical capillaries up to moderate capillary numbers.

Annual scientific session of the Mathematical Linguistics Department

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

The annual scientific session of the Department of Mathematical Linguistic will be held on December 20, 2022, Tuesday, at 1:00 pm in Room 278 of IMI - BAS. PROGRAM

Annual Scientific Session of the Department of Differential Equations and Mathematical Physics

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

The annual scientific session of the Department of Differential Equations and Mathematical Physics will be held on December 21, 2022, at 1:00 pm, in Room 478 of IMI.  Everybody is invited. PROGRAM   Join Zoom Meeting https://us02web.zoom.us/j/85112407201?pwd=RHZocFk0NjV2R003UWJEZzVxMXdGUT09 Meeting ID: 851 1240 7201 Passcode: 783002

Joint Seminar of the MMNA and MFI Departments

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

A joint seminar of the departments of Mathematical Modeling and Numerical Analysis and Mathematical Foundations of Informatics will be held on January 5th, 2023 (Thursday), at 3:00 pm in Room 403 of IMI - BAS. A talk on  Universal extrema of potentials of certain classes of spherical designs will be delivered by Prof. Sergiy Borodachov, Towson University. Abstract: We will discuss known results and our work on locations of absolute minima and maxima of the total potential of N points located on a higher-dimensional sphere that form a spherical design of the highest (in some sense) strength. The potential is a completely monotone function of the Euclidean distance squared. These results apply to a quite extensive list of particular spherical configurations. For power-law potentials [...]

Seminar on Applications of Differential Applications in Sciences

Zoom

The seminar on Applications of Differential Equations in Sciences will be held online on January 11, 2023 at 2:00 p.m. Acad. Petar Popivanov will deliver a talk on EXPLICIT FORMULAS AND GRAPHICAL PRESENTATIONS OF THE SOLUTIONS OF FIRST-ORDER ODE CLASSES IN THE VICINITY OF A SINGULAR POINT. DAVIDOV'S THEOREM Join Zoom Meeting: https://us02web.zoom.us/j/2013612941?pwd=cGFvdWJJTTAvRmJzRWtzMHlZWEIvUT09 Meeting ID: 201 361 2941 Passcode: 6VeNEq Everybody is invited.

Algebra and Logic Seminar

Zoom

The next meeting of the Algebra and Logic Seminar will be held on January 13, 2023 (Friday) online in Zoom. A talk on: Artificial Intelligence - Definition, Implementation and Consequences will be delivered by Dimitar Dobrev (IMI - BAS).   The seminar will be held online. Join the Zoom link: https://us02web.zoom.us/j/85137375021?pwd=RE5QczdFTE1xL1R6MnI2b1lkcGczQT09 Topic: Онлайн семинар на секция "Алгебра и логика" Time: Jan 13, 2023 01:00 PM Sofia Meeting ID: 851 3737 5021 Passcode: 035647 Algebra and Logic Department, IMI - BAS http://www.math.bas.bg/algebra/seminarAiL/ ============================== =====================

Defense of the PhD thesis of Galina Lyutskanova-Zhekova

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 January 16, 2023, at 2:00 p.m., an open meeting of the Scientific Board will be held at IMI - BAS for the defense of the doctoral dissertation on: Numerical modelling of nonlinear boundary value problems of second and fourth order: application in physicochemistry and biology of Galina Stoyanova Lyutskanova–Zhekova Higher Education Field 4. Science, Mathematics and Informatics, Professional field 4.5. Mathematics, PhD program “Mathematical Modelling and Application of Mathematics” Research Advisors: Prof. Krasimir Danov, D.Sc. Assoc. Prof. Ivan Bazhlekov, PhD Chairman of the Scientific Board: Assoc. Prof. Peter Rashkov, PhD Members of the Scientific Board: Prof. Krasimir Danov, D.Sc. Prof. Michail Todorov, [...]

Didactical Modeling Seminar

The next meeting of the seminar Didactical Modeling will be held on January 23, 2023, at 2:30 pm in Room 278 of IMI – BAS. A talk on: The Bulgarian experience in preparation and participation in international mathematical competitions will be delivered by Prof. Stanislav Harizanov.

Joint seminar of the ICMS and the MFI Department

A joint seminar of the International Center for Mathematical Sciences and the Department of Mathematical Foundations of Informatics will be held on Tuesday, January 24, 2023, at 3:00 pm. Speaker: Maryam Bajalan Title: Linear and Cyclic Codes over Rings Abstract: The study of codes over the rings (ring-linear codes) attracted great interest after the work of Calderbank, Hammons, Kumar, Sloane, and Sole in the early 1990s. In this seminar, the basic theory of linear codes over finite commutative rings will be presented including the importance of codes over rings, various kinds of rings for ring-linear coding theory, the weight functions on finite rings, MacWilliams equivalence theorem and the connection between these codes and codes over fields via the Gray maps. Moreover, the cyclic codes over finite [...]

Seminar of the SofTIS Department

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

On January 31, 2023, at 2:00 pm, in Room 278 of IMI and online the net meeting of the restored seminar of the SofTIS Department will be held. Dr. Todor Branzov will deliver a lecture on Value Based Healthcare (VBHC) - problems in the field of informatics. Everybody is invited. http://meet.jit.si/

Joint seminar of the ICMS and the MFI Department

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

A joint seminar of the International Center for Mathematical Sciences and the Department of Mathematical Foundations of Informatics will be held on Tuesday, January 31, 2023, at 3:00 pm, in Room 403 of IMI - BAS. Speaker: Prof. Nikolaj Glazunov, IMI - BAS, Institute of Cybernetics, Kiev. Title: On optimal packing of Minkowski balls and applications Abstract: We investigate lattice packings of Minkowski balls and domains. By results of the proof of Minkowski conjecture about the critical determinant we divide the balls and domains on 3 classes: Minkowski, Davis and Chebyshev-Cohn. The optimal lattice packings of the balls and domains are obtained. The minimum areas of hexagons inscribed in the balls and domains and circumscribed around them are given. These results lead to algebro-geometric [...]

Joint seminar of the Bulgarian Statistical Society and the National Seminar on Probability and Statistics

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

The Bulgarian Statistical Society (BSS) and the National Seminar on Probability and Statistics will hold a joint seminar on February 1, 2023, at 3:00 pm, in Room 503 of IMI - BAS. When: Wednsday, February 1, 2023, 3:00 pm Where: Room 503 of IMI – BAS, or Join Zoom Meeting https://us02web.zoom.us/j/89261668021?pwd=OStXRmpFOVNTaEJvOThpRXUvOUpBQT09 Lecturer: Jordan M. Stoyanov (IMI - BAS, Shandong University, China) Topic:  Probability and Statistics in Bulgaria in the last 50 years  

ICMS course in Algebraic Geometry

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

The next lecture of the Course in Algebraic Geometry at the ICMS will be delivered, exceptionally, on February 6, 2023, at 12:15 pm in Room 403 of IMI - BAS.

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 February 6, 2023, at 2:30 pm in Room 278 of IMI – BAS. A talk on: The online competition VIVA Mathematics with Computer will be delivered by Acad. Petar Kenderov, Prof. Toni Chehlarova and Chief Assist. Prof. Georgi Gachev.

Seminar of the SofTIS Department

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

The next meeting of the seminar of the SofTIS Department will be held on February 7, 2023, at 2:00 pm, in Room 278 of IMI and online at https://meet.jit.si/IMI-SofTIS. A talk on Style Accessory Occlusion using CGAN with Paired Data. will be delivered by Assoc. Prof. Alexander Iliev. Everybody is invited.

Algebra and Logic Seminar

Zoom

The next meeting of the Algebra and Logic Seminar will be held on February 10, 2023 (Friday) online in Zoom. A talk on: A New Approach to the Characteristic Polynomial of a Random Unitary Matrix will be delivered by Yacine Barhoumi-Andréani (Ruhr-Universität Bochum, Germany). Abstract. The characteristic polynomial of a random (Haar-distributed) unitary matrix is considered as an interesting toy model for the probabilistic study of the Riemann Zeta function. We will recall the history of the topic starting with the Montgommery-Dyson correspondance, the Keating-Snaith moments conjecture and some recent developments on other functionals. We will then give a conceptual comparison of some of the techniques used in the field and a zoo of results one can achieve, with a particular focus on a [...]

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 11, 2023 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 such as GeoGebra, GEONExT, Elica, Scratch, Comenius Logo, etc .; devices and systems for dynamic presentation of mathematical facts; [...]

Defense of the PhD thesis of Detelina Kamburova

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 14, 2023, at 2:00 p.m. in Room 503 of IMI-BAS, an open meeting of the Scientific Board will be held at IMI - BAS for the defense of the doctoral dissertation on: Variational principles for supinfproblems with constraint and equilibrium in non-cooperative games of Detelina Kirilova Kamburova Higher Education Field 4. Science, Mathematics and Informatics, Professional field 4.5. Mathematics, PhD program “Operations Research” Research Advisors: Acad. Julian Revalski Chairman of the Scientific Board: Prof. Tsvetomir Tsachev, PhD Members of the Scientific Board: Acad. Julian Revalski Prof. Nadia Zlateva D.Sc. Prof. Boyan Zlatanov, D.Sc. Assoc. Prof. Diana Nedelcheva, PhD The documents related [...]

Joint seminar of the ICMS and the AGT Department

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

A joint seminar of the International Center for Mathematical Sciences and the Department of Analysis, Geometry and Topology will be held on Tuesday, February 14, 2023, at 3:00 pm, in Room 403 of IMI - BAS. Speaker: Assoc. Prof. Todor Popov, INRNE, Bulgarian Academy of Sciences & AUBG. Title: Jordan algebra conformal toolbox Abstract

Applied Mathematics Seminar

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

A New Walk on Equations Monte Carlo Method for Linear Algebraic Problems Lecturer: Prof. Ivan Dimov Time: 4:00 pm Date: February 14, 2023 Place: Room 503 of IMI - BAS Abstract: A new Walk on Equations (WE) Monte Carlo algorithm for Linear Algebra (LA) problem, namely, functionals of the solution, eigenvalue problems, etc., is proposed and studied. This algorithm relies on a non-discounted sum of an absorbed random walk. It can be applied for either real or complex matrices. Several techniques like simultaneous scoring or the sequential Monte Carlo method are applied to improve the basic algorithm. Numerical tests are performed on examples with matrices of different size and on systems coming from various important applications. Comparisons with standard deterministic, including unimprovable Conjugate Gradient [...]

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 February 15, 2023, at 2:00 p.m. (UTC +2) in Room 403 of the Institute of Mathematics and Informatics. A talk on: The Disorder Problem. A POMDP approach will be delivered by Doncho Donchev (FMI - SU). Abstract: We revisit the discrete time disorder problem. The classical approach to it is based on optimal stopping rules and martingale techniques. We include it into the framework of Partially Observable Markov Decision Processes which improves the quality of detection, and allows, in some cases, to find solutions to Bellman's equation.  

National Mathematics Colloquium

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 February 15, 2023 (Wednesday) at 4:15 pm EET (UTC +2) in the Conference Room of IMI - BAS. A talk on: GOLDBERG CONJECTURE will be delivered by Acad. Oleg Mushkarov, Institute of Mathematics and Informatics, Bulgarian Academy of Sciences. The meeting is dedicated to: The 50th anniversary of the National Mathematics Colloquium The 125th anniversary of the Union of Bulgarian Mathematicians The International Year of Basic Sciences for Sustainable Development 2022/2023 Abstract. In 1969, S. Goldberg conjectured that every Einstein symplectic structure on a compact manifold is Kähler-Einstein. This conjecture has not yet been proven and [...]

Defense of the PhD thesis of Miroslav Dimitrov

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 17, 2023, at 1:00 p.m., an open meeting of the Scientific Board will be held at IMI - BAS for the defense of the doctoral dissertation on: Designing Boolean Functions and Digital Sequences for Cryptology and Communications of Miroslav Marinov Dimitrov Higher Education Field 4. Science, Mathematics and Informatics, Professional field 4.6. Informatics and Computer Science, PhD program “Informatics” Research Advisor: Prof. Tsonka Baicheva, D.Sc. Chairman of the Scientific Board: Prof. Ivan Landzhev, D.Sc. Members of the Scientific Board: Prof. Nikolay Yankov, D.Sc. Prof. Tsonka Baicheva, D.Sc. Prof. Maya Stoyanova, PhD Assoc. Prof. Zlatko Varbanov, PhD The documents related to the [...]

Algebra and Logic Seminar

Zoom

The next meeting of the Algebra and Logic Seminar will be held on February 17, 2023 (Friday) online in Zoom. A talk on: Invariant theory for reductive subgroups of reductive groups will be delivered by Valdemar Tsanov (IMI-BAS). Abstract.Let H ⸦ G be an embedding of connected complex reductive linear algebraic groups. A classical question with several important interpretations is: which irreducible G-modules contain nonzero H-invariant vectors? An approach based on the Geometric Invariant Theory of Hilbert-Mumford was developed in works of Heckman, Berenstein-Sjamaar, Belkale-Kumar and Ressayre, culminating in a description of the generalized Littlewood-Richadson cone - the convex hull of set of the highest weights of the G-modules containing H-invariants. The discrepancy between the convex hull and the actual set of weights presents [...]

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 February 20, 2023, at 2:30 pm in Room 278 of IMI – BAS. A talk on: Problem selection for 4th - 7th grade for the National Mathematics Olympiad  will be delivered by Nevena Sabeva-Koleva.

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