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X-WR-CALDESC:Събития за Institute of Mathematics and Informatics
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DTSTART:20240331T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240312T140000
DTEND;TZID=Europe/Sofia:20240312T153000
DTSTAMP:20260501T094710
CREATED:20240310T220549Z
LAST-MODIFIED:20240311T083549Z
UID:15998-1710252000-1710257400@math.bas.bg
SUMMARY:Предзащита на дисертация на Данила Черкашин за присъждане на научна степен “доктор на науките”
DESCRIPTION:На 12 март 2024 г. (вторник) от 14:00 ч. в Заседателната зала на ИМИ-БАН \nще се състои предварителна защита на проекта на дисертация на \nДанила Дмитриевич Черкашин \nна тема \nExtremal problems in Euclidean Combinatorial Geometry\nза присъждане на  научната степен “доктор на науките“. \n\nПоканват се всички интересуващи се. \nПроектът на дисертацията е на разположение в библиотеката на ИМИ – БАН. \nПредзащитата може да бъде проследена и на  https://meet.jit.si/IMI-MOI-14400 \n\n\n 
URL:https://math.bas.bg/event/%d0%bf%d1%80%d0%b5%d0%b4%d0%b7%d0%b0%d1%89%d0%b8%d1%82%d0%b0-%d0%bd%d0%b0-%d0%b4%d0%b8%d1%81%d0%b5%d1%80%d1%82%d0%b0%d1%86%d0%b8%d1%8f-%d0%bd%d0%b0-%d0%b4%d0%b0%d0%bd%d0%b8%d0%bb%d0%b0-%d1%87%d0%b5/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Защита
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240312T140000
DTEND;TZID=Europe/Sofia:20240312T153000
DTSTAMP:20260501T094710
CREATED:20240311T225834Z
LAST-MODIFIED:20240311T225834Z
UID:16009-1710252000-1710257400@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Дата: 12.03.2024 г.\, 14:00 ч. \nМясто: Зала 403\, ИМИ – БАН \nДокладчик: Morgan Brown  (University of Miami) \nДоклад: The Cox ring perspective on birational geometry \nДопълнителна информация: https://icms.bg/the-cox-ring-perspective-in-birational-geometry-talk-by-morgan-brown/ \nРезюме. The Mori program for birational classification of algebraic varieties attempts to classify algebraic varieties by producing canonical models\, polarized by the canonical class. This is accomplished through a series of algebraic surgery operations\, such as flips\, flops\, and divisorial contractions. A complementary viewpoint is that of the total coordinate ring or Cox ring. Here birational maps are understood by looking at the totality of all linear series on the variety\, endowed with a ring structure directly analogous to that of the homogeneous coordinate ring of a projective variety. I will give an overview of how Cox rings can help clarify many phenomena in birational geometry.
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%bd%d0%b0-%d0%bc%d1%86%d0%bc%d0%bd-21/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240314T140000
DTEND;TZID=Europe/Sofia:20240314T153000
DTSTAMP:20260501T094710
CREATED:20240311T230335Z
LAST-MODIFIED:20240311T230335Z
UID:16014-1710424800-1710430200@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Дата: 14.03.2024 г.\, 14:00 ч. \nМясто: Зала 403\, ИМИ – БАН \nДокладчик: Morgan Brown  (University of Miami) \nДоклад: Cox rings and characterization of toric varieties \nДопълнителна информация: https://icms.bg/the-cox-ring-perspective-in-birational-geometry-talk-by-morgan-brown/ \nРезюме. Recently Moraga and Svaldi proved a conjecture of Shokoruv\, characterizing in the relative case toroidal morphisms as those which admit divisors with many components relative to the Picard rank. I will discuss the global version\, proved in previous joint work with McKernan\, Svaldi and Zong. The proof relies on characterizing the singularity type of the Cox ring\, giving another example of the use of these invariants in birational geometry.
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%bd%d0%b0-%d0%bc%d1%86%d0%bc%d0%bd-22/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240318T163000
DTEND;TZID=Europe/Sofia:20240318T180000
DTSTAMP:20260501T094710
CREATED:20240315T074444Z
LAST-MODIFIED:20240315T074848Z
UID:16051-1710779400-1710784800@math.bas.bg
SUMMARY:Семинар "Математически основи на информатиката" във Велико Търново
DESCRIPTION:Сбирка на семинара “Математически основи на информатиката” ще се проведе във Велико Търново на 18 март (понеделник) от 16:30 часа в зала 401 на корпус 4 на ВТУ. \nДоклад на тема \nLCD Codes over Mixed Alphabets\nще изнесе Maryam Bajalan\, ИМИ – БАН. \nРезюме: In this presentation\, we describe the structural properties of (Galois) linear complementary dual codes over mixed alphabets arising from finite chain rings. Our focus centres on providing a comprehensive characterization\, outlining the conditions under which a given code falls into this category and it is Galois invariant. This leads to the study of the Gray image of FpFp[θ]-linear codes\, where p ∈ {2\,3} and θ ≠ θ2 = 0 \, that provides Fp-linear complementary dual codes. \nJoin Zoom Meeting\nhttps://us05web.zoom.us/j/87139062405?pwd=OytyS4AVwUy9U0Ok9hbW9tivGfFauR.1 \nMeeting ID: 871 3906 2405\nPasscode: 9BiJtF
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%bc%d0%b0%d1%82%d0%b5%d0%bc%d0%b0%d1%82%d0%b8%d1%87%d0%b5%d1%81%d0%ba%d0%b8-%d0%be%d1%81%d0%bd%d0%be%d0%b2%d0%b8-%d0%bd%d0%b0-%d0%b8%d0%bd%d1%84%d0%be-3/
LOCATION:Великотърновски университет\, ул. "Теодосий Търновски" № 2\, Велико Търново\, 5005\, Bulgaria
CATEGORIES:Редовен семинар
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240319T160000
DTEND;TZID=Europe/Sofia:20240319T173000
DTSTAMP:20260501T094710
CREATED:20240315T081347Z
LAST-MODIFIED:20240315T082053Z
UID:16060-1710864000-1710869400@math.bas.bg
SUMMARY:Колоквиум на МЦМН
DESCRIPTION:Дата и час: 19.03.2024 г.\, сряда\, 16:00 ч. \nМясто: изцяло в Zoom \nЛектор: Веселин Петков (Université Bordeaux) \nДоклад: Dynamical zeta function for billiard flow \nАбстракт: 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 singularities of \(u(t)\) yield the dynamical zeta functions \(\eta_{\mathrm N}(s)\,\: \eta_{\mathrm D}(s)\) for Neumann and Dirichlet boundary conditions\, respectively. These zeta functions play a crucial role in the analysis of the distribution of the resonances. In this talk we discuss two results. (1) Under a non-eclipse condition\, we show that \(\eta_{\mathrm N}\) and \(\eta_\mathrm D\) admit a <em>meromorphic continuation</em> in the whole complex plane with simple poles and integer residues. (2) In the case when the boundary \(\partial D\) is real analytic\, we prove that the function \(\eta_\mathrm{D}\) cannot be entire and the modified Lax Phillips conjecture (MLPC) holds. This conjecture introduced in 1990 says that there exists of a strip \(\{z \in C: \: 0 < \Im z \leqslant\alpha\}\) containing an infinite number of resonances \(\mu_j\) for the Dirichlet problem. The above results are obtained in a joint work with Yann Chaubet.
URL:https://math.bas.bg/event/%d0%ba%d0%be%d0%bb%d0%be%d0%ba%d0%b2%d0%b8%d1%83%d0%bc-%d0%bd%d0%b0-%d0%bc%d1%86%d0%bc%d0%bd-2/
LOCATION:Zoom
CATEGORIES:Редовен семинар
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240320T160000
DTEND;TZID=Europe/Sofia:20240320T173000
DTSTAMP:20260501T094710
CREATED:20240315T080032Z
LAST-MODIFIED:20240315T080032Z
UID:16056-1710950400-1710955800@math.bas.bg
SUMMARY:Семинар по геометрия на МЦМН
DESCRIPTION:Следващата сбирка на Семинара по геометрия на МЦМН\nще се проведе в сряда\, 20 март 2024 г. от 16:00 ч. в зала 403: \nДоклад на тема \nEllipsoid superpotentials: obstructing symplectic embeddings by singular algebraic curves\n\nще изнесе Григори Михалкин\, Женевски университет. \n\n\nAbstract: 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 into a ball\, with the answer given by the spectacular Fibonacci staircase of McDuff and Schlenk. The aspect ratio a>1 of the ellipsoid can be viewed as a real parameter for a certain enumerative superpotential function\, which is mostly locally constant\, but jumps at certain specific rational values (responsible for the aspects of cusp singularities). Based on joint work with Kyler Siegel.\n\nТова заседание на семинара няма да се излъчва в Zoom.
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%bf%d0%be-%d0%b3%d0%b5%d0%be%d0%bc%d0%b5%d1%82%d1%80%d0%b8%d1%8f-%d0%bd%d0%b0-%d0%bc%d1%86%d0%bc%d0%bd-11/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
ORGANIZER;CN="%D0%98%D0%BD%D1%81%D1%82%D0%B8%D1%82%D1%83%D1%82%20%D0%BF%D0%BE%20%D0%BC%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0%20%D0%B8%20%D0%B8%D0%BD%D1%84%D0%BE%D1%80%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0%20-%20%D0%91%D0%90%D0%9D":MAILTO:office@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240322T110000
DTEND;TZID=Europe/Sofia:20240322T123000
DTSTAMP:20260501T094710
CREATED:20240320T124728Z
LAST-MODIFIED:20240320T124728Z
UID:16087-1711105200-1711110600@math.bas.bg
SUMMARY:Предзащита на дисертационен труд на Димитър Добрев за получаване на образователна и научна степен "доктор"
DESCRIPTION:На 22 март (петък) от 11 часа в зала 503 на ИМИ-БАН ще се проведе предзащита на проекта на дисертация на\n\nДимитър Димитров Добрев\n\nна тема\n\nИзкуствен интелект — дефиниция\, реализация и последствия\n\nза получаване на научната степен “доктор” в област на висше образование 4. Природни науки\, математика и информатика\,\nпрофесионално направление 4.5 Математика\, научна специалност “Математическа логика”.\n\nПроектът на дисертацията е на разположение в библиотеката на ИМИ-БАН и онлайн на следните адреси:\nhttps://dobrev.com/AI/Dobrev_PhD_v3.pdf  (основен текст)\nhttps://dobrev.com/AI/Dobrev_PhD_avtoref.pdf  (автореферат)\nhttps://dobrev.com/AI/Dobrev_PhD_abstract.pdf  (автореферат на английски език).\n\n\nПредзащитата ще се предава и по ZOOM на следния линк:\nhttps://us02web.zoom.us/j/85137375021?pwd=RE5QczdFTE1xL1R6MnI2b1lkcGczQT09\n\nПоканват се всички желаещи да присъстват.\n\nОт секция “Алгебра и логика” на ИМИ-БАН\nhttp://www.math.bas.bg/algebra/seminarAiL/
URL:https://math.bas.bg/event/%d0%bf%d1%80%d0%b5%d0%b4%d0%b7%d0%b0%d1%89%d0%b8%d1%82%d0%b0-%d0%bd%d0%b0-%d0%b4%d0%b8%d1%81%d0%b5%d1%80%d1%82%d0%b0%d1%86%d0%b8%d0%be%d0%bd%d0%b5%d0%bd-%d1%82%d1%80%d1%83%d0%b4-%d0%bd%d0%b0-%d0%b4/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Защита
ORGANIZER;CN="%D0%A1%D0%B5%D0%BA%D1%86%D0%B8%D1%8F%20%D0%90%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0%20%D0%B8%20%D0%BB%D0%BE%D0%B3%D0%B8%D0%BA%D0%B0":MAILTO:algebra_logic_seminar@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240322T130000
DTEND;TZID=Europe/Sofia:20240322T143000
DTSTAMP:20260501T094710
CREATED:20240315T082836Z
LAST-MODIFIED:20240315T082836Z
UID:16071-1711112400-1711117800@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 22 март 2024 г. (петък) от 13:00 часа ще се проведе дистанционно заседание на семинара по „Алгебра и логика”. \nДоклад на тема: \nOn the uniqueness of maximal solvable extensions of nilpotent Lie algebras\nще изнесе \nBakhrom A. Omirov (Harbin Institute of Technologies\, Harbin\, China and Romanovskiy Institute of Mathematics\, Uzbekistan Academy of Sciences\, Uzbekistan). \nАбстракт. 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. \nЛинк към Zoom-стаята на семинара:\nhttps://us02web.zoom.us/j/85137375021?pwd=RE5QczdFTE1xL1R6MnI2b1lkcGczQT09 \n\n\n\nОт секция „Алгебра и логика” на ИМИ – БАН\nhttp://www.math.bas.bg/algebra/seminarAiL/\n============================== =====================
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%b0%d0%bb%d0%b3%d0%b5%d0%b1%d1%80%d0%b0-%d0%b8-%d0%bb%d0%be%d0%b3%d0%b8%d0%ba%d0%b0-111/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
ORGANIZER;CN="%D0%A1%D0%B5%D0%BA%D1%86%D0%B8%D1%8F%20%D0%90%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0%20%D0%B8%20%D0%BB%D0%BE%D0%B3%D0%B8%D0%BA%D0%B0":MAILTO:algebra_logic_seminar@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240327T160000
DTEND;TZID=Europe/Sofia:20240327T173000
DTSTAMP:20260501T094710
CREATED:20240325T222412Z
LAST-MODIFIED:20240325T222412Z
UID:16094-1711555200-1711560600@math.bas.bg
SUMMARY:Семинар по Приложна математика
DESCRIPTION:On constructions of spherical codes\nДокладчик: д-р Константин Воробьов\, ИМИ – БАН\nДата: 27.03.2024 г.\nЧас: 16:00 ч.\nМясто: зала 503 \nРезюме: 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. \n 
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%bf%d0%be-%d0%bf%d1%80%d0%b8%d0%bb%d0%be%d0%b6%d0%bd%d0%b0-%d0%bc%d0%b0%d1%82%d0%b5%d0%bc%d0%b0%d1%82%d0%b8%d0%ba%d0%b0-9/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
ORGANIZER;CN="%D0%98%D0%BD%D1%81%D1%82%D0%B8%D1%82%D1%83%D1%82%20%D0%BF%D0%BE%20%D0%BC%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0%20%D0%B8%20%D0%B8%D0%BD%D1%84%D0%BE%D1%80%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0%20-%20%D0%91%D0%90%D0%9D":MAILTO:office@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240327T160000
DTEND;TZID=Europe/Sofia:20240327T173000
DTSTAMP:20260501T094710
CREATED:20240326T081032Z
LAST-MODIFIED:20240326T081032Z
UID:16111-1711555200-1711560600@math.bas.bg
SUMMARY:Семинар по геометрия на МЦМН
DESCRIPTION:Следващата сбирка на Семинара по геометрия на МЦМН\nще се проведе в сряда\, 27 март 2024 г. от 16:00 ч. в зала 403: \nДоклад на тема \nReading seminar of geometric Lubin-Tate theory\n\nще изнесе Jiachang Xu\, ИМИ – БАН. \n\n\nAbstract: 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.\n\nZoom link:\nhttps://us02web.zoom.us/j/83740034721?pwd=VnBtcVpGUktscHQ4a09jZkNZTURyZz09
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%bf%d0%be-%d0%b3%d0%b5%d0%be%d0%bc%d0%b5%d1%82%d1%80%d0%b8%d1%8f-%d0%bd%d0%b0-%d0%bc%d1%86%d0%bc%d0%bd-12/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
ORGANIZER;CN="%D0%98%D0%BD%D1%81%D1%82%D0%B8%D1%82%D1%83%D1%82%20%D0%BF%D0%BE%20%D0%BC%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0%20%D0%B8%20%D0%B8%D0%BD%D1%84%D0%BE%D1%80%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0%20-%20%D0%91%D0%90%D0%9D":MAILTO:office@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240329T130000
DTEND;TZID=Europe/Sofia:20240329T143000
DTSTAMP:20260501T094710
CREATED:20240326T074049Z
LAST-MODIFIED:20240326T074049Z
UID:16107-1711717200-1711722600@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 29 март 2024 г. (петък) от 13:00 часа ще се проведе дистанционно заседание на семинара по „Алгебра и логика”. \nДоклад на тема: \nGeneralized Definability of Discrete Time Interval-based Temporal Connectives\nще изнесе \nДимитър Гелев\, ИМИ – БАН. \nАбстракт. 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 a first-order definition\, a star-free ITLNL defining formula for #(A1\,…\,Am) can be produced that is built from the past\, future and introspective formulas appearing in some separated equivalents of the operands A1\,…\,Am. The proof is based in an interval-based analogue of Gabbay’s separation theorem about PLTL that was previously established about ITLNL by the neighbourhood modalities by me and Moszkowski and have now used to prove the expressive completeness of ITLNL. As a side result I have come upon new proofs of expressive completeness and temporal separation for ITLNL’s star-free subset that I will briefly discuss too. \nЛинк към Zoom-стаята на семинара:\nhttps://us02web.zoom.us/j/85137375021?pwd=RE5QczdFTE1xL1R6MnI2b1lkcGczQT09 \n\n\n\nОт секция „Алгебра и логика” на ИМИ – БАН\nhttp://www.math.bas.bg/algebra/seminarAiL/\n============================== =====================
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%b0%d0%bb%d0%b3%d0%b5%d0%b1%d1%80%d0%b0-%d0%b8-%d0%bb%d0%be%d0%b3%d0%b8%d0%ba%d0%b0-112/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
ORGANIZER;CN="%D0%A1%D0%B5%D0%BA%D1%86%D0%B8%D1%8F%20%D0%90%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0%20%D0%B8%20%D0%BB%D0%BE%D0%B3%D0%B8%D0%BA%D0%B0":MAILTO:algebra_logic_seminar@math.bas.bg
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