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X-WR-CALDESC:Събития за Institute of Mathematics and Informatics
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BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240412T130000
DTEND;TZID=Europe/Sofia:20240412T143000
DTSTAMP:20260407T093919
CREATED:20240409T201342Z
LAST-MODIFIED:20240409T201619Z
UID:16175-1712926800-1712932200@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 12 април 2024 г. (петък) от 13:00 часа ще се проведе дистанционно заседание на семинара по „Алгебра и логика”. \nДоклад на тема: \nOn an Aspect of Second Quantum Revolution\nще изнесе \nВалентин Илиев\, ИМИ – БАН. \nАбстракт. The 2022 Nobel Prize in Physics has been awarded to Alain Aspect\, John Clauser\, and Anton Zeilinger for their work in Quantum Theory. Mass media called this event part of second quantum revolution which includes mainly quantum computing and other super-technologies. Here we discuss Alain Aspect’s version of Einstein-Podolsky-Rosen thought experiment and show that there exists an internal dependence of the simultaneous measurements made by the two pairs of linear polarizers operated in each leg of the apparatus during this experiment. The corresponding Shannon-Kolmogorov information flow (or\, noise?) linking a polarizer from one leg to a polarizer from the other leg is proportional to the absolute value of this function of dependence. It turns out that if Bell’s inequality is violated\, then the experiment performed at one leg is informationally dependent on the experiment at the other leg. \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%b0-113/
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:20240410T141500
DTEND;TZID=Europe/Sofia:20240410T160000
DTSTAMP:20260407T093919
CREATED:20240410T092757Z
LAST-MODIFIED:20240410T092757Z
UID:16184-1712758500-1712764800@math.bas.bg
SUMMARY:Семинар "Диференциални уравнения и математическа физика"
DESCRIPTION:На 10.04.2024 г. от 14:15 в зала 478 на ИМИ\nще се състои поредната сбирка на\nсеминара по Диференциални уравнения и математическа физика.\nДоклад на тема \nCHEMICAL COMPOSITION OF THE SUN DISK AND OF THE STARS’ DISKS. EVOLUTION OF THE STARS. BINARY SYSTEMS. GEOMAGNETIC STORMS. SATELLITES. SOLAR-TERRESTIAL INVESTIGATION AND SOLAR WIND. AIRPLANES AND HELICOPTERS\nще изнесе Емилиан Атанасов. \nВсички интересуващи се са добре дошли
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%b4%d0%b8%d1%84%d0%b5%d1%80%d0%b5%d0%bd%d1%86%d0%b8%d0%b0%d0%bb%d0%bd%d0%b8-%d1%83%d1%80%d0%b0%d0%b2%d0%bd%d0%b5%d0%bd%d0%b8%d1%8f-%d0%b8-%d0%bc%d0%b0-3/
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%94%D0%B8%D1%84%D0%B5%D1%80%D0%B5%D0%BD%D1%86%D0%B8%D0%B0%D0%BB%D0%BD%D0%B8%20%D1%83%D1%80%D0%B0%D0%B2%D0%BD%D0%B5%D0%BD%D0%B8%D1%8F%20%D0%B8%20%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%B0%20%D1%84%D0%B8%D0%B7%D0%B8%D0%BA%D0%B0":MAILTO:seminar_differential_equations@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240329T130000
DTEND;TZID=Europe/Sofia:20240329T143000
DTSTAMP:20260407T093919
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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240327T160000
DTEND;TZID=Europe/Sofia:20240327T173000
DTSTAMP:20260407T093919
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:20240327T160000
DTEND;TZID=Europe/Sofia:20240327T173000
DTSTAMP:20260407T093919
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:20240322T130000
DTEND;TZID=Europe/Sofia:20240322T143000
DTSTAMP:20260407T093919
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:20240322T110000
DTEND;TZID=Europe/Sofia:20240322T123000
DTSTAMP:20260407T093919
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:20240320T160000
DTEND;TZID=Europe/Sofia:20240320T173000
DTSTAMP:20260407T093919
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:20240319T160000
DTEND;TZID=Europe/Sofia:20240319T173000
DTSTAMP:20260407T093919
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:20240318T163000
DTEND;TZID=Europe/Sofia:20240318T180000
DTSTAMP:20260407T093919
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:20240314T140000
DTEND;TZID=Europe/Sofia:20240314T153000
DTSTAMP:20260407T093919
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:20240312T140000
DTEND;TZID=Europe/Sofia:20240312T153000
DTSTAMP:20260407T093919
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:20240312T140000
DTEND;TZID=Europe/Sofia:20240312T153000
DTSTAMP:20260407T093919
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:20240228T160000
DTEND;TZID=Europe/Sofia:20240228T173000
DTSTAMP:20260407T093919
CREATED:20240222T091637Z
LAST-MODIFIED:20240222T091637Z
UID:15979-1709136000-1709141400@math.bas.bg
SUMMARY:Семинар по геометрия на МЦМН
DESCRIPTION:Следващата сбирка на Семинара по геометрия на МЦМН\nще се проведе в сряда\, 28 февруари 2024 г. от 16:00 ч. в зала 403 и онлайн в Zoom: \nДоклад на тема \nLinear embeddings of complex Grassmannians\n\nще изнесе Иван Пенков\, Constructor University Bremen. \n\nZoom link:\n\nhttps://us02web.zoom.us/j/83740034721?pwd=VnBtcVpGUktscHQ4a09jZkNZTURyZz09\n\nAbstract: A linear embedding of Grassmannians\, one of which could possibly be isotropic\, is an embedding which respects the generators of Picard groups. Several years ago A.S. Tikhomirov and I classified such embeddings when both Grassmannians are simultaneously usual Grassmannians or isotropic Grassmannians of the same type(orthogonal or symplectic). In this talk I will discuss also the mixed case. A classification as above has an application to the classification of infinite-dimensional linear ind-Grassmannians\, and I shall  briefly explain this at the end of the talk.
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-10/
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:20240226T160000
DTEND;TZID=Europe/Sofia:20240226T180000
DTSTAMP:20260407T093919
CREATED:20240226T085939Z
LAST-MODIFIED:20240226T092155Z
UID:15987-1708963200-1708970400@math.bas.bg
SUMMARY:Защита на дисертация за присъждане на научната степен „доктор на науките”
DESCRIPTION:Институтът по математика и информатика при БАН и Научното жури за присъждане\nна научната степен „доктор на науките” съобщават\, че \nна 26 февруари 2024 г. от 16:00 часа в хибридна форма (в зала 403 на ИМИ-БАН и в Zoom) ще се проведе открито заседание на Научното жури за защита на дисертационен труд на тема: \nСимплектична топология\, некомутативна геометрия и огледална симетрия\nна \nпроф. д-р Людмил Василев Кацарков\nв област на висше образование: 4. Природни науки\, математика и информатика\nпрофесионално направление: 4.5. Математика\nнаучна специалност Геометрия и топология. \nПредседател на Научното жури:\nчл.-кор. проф. дмн Стефан Петров Иванов (ФМИ-СУ\, ИМИ-БАН) \nЧленове на Научното жури:\nакад. проф. дмн Веселин Стоянов Дренски (ИМИ-БАН);\nчл.-кор. проф. дфн Валентина Борисова Петкова (ИЯИЯЕ-БАН);\nпроф. д-р Азнив Киркор Каспарян (ФМИ-СУ);\nпроф. д-р Гео Владимиров Грънчаров (Florida International University\, USA);\nпроф. д-р Фьодор Богомолов (Courant Institute of Mathematical Sciences\, New York\, USA);\nпроф. д-р Юрий Чинкел (Courant Institute of Mathematical Sciences\, New York\, USA). \nМатериалите по защитата са на разположение в библиотеката на ИМИ-БАН и са публикувани на интернет страницата на ИМИ:\nhttp://www.math.bas.bg/omi/IMIdocs/ZRASRB/degrees_doctor_current.php \nZoom link към заседанието за защитата:\nhttps://us02web.zoom.us/j/87820682286?pwd=akx0RlN0bGRycitnZ1ZyOXVKeWJBdz09
URL:https://math.bas.bg/event/%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%b7%d0%b0-%d0%bf%d1%80%d0%b8%d1%81%d1%8a%d0%b6%d0%b4%d0%b0%d0%bd%d0%b5-%d0%bd%d0%b0/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Защита
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
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BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240223T130000
DTEND;TZID=Europe/Sofia:20240223T143000
DTSTAMP:20260407T093919
CREATED:20240216T131821Z
LAST-MODIFIED:20240216T131821Z
UID:15974-1708693200-1708698600@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 23 февруари 2024 г. (петък) от 13:00 часа ще се проведе дистанционно заседание на семинара по „Алгебра и логика”. \nДоклад на тема: \nInvariant subalgebras of the rational Cherednik algebra\nще изнесе \nNiall Hird (University of Glasgow\, UK). \nАбстракт. The rational Cherednik algebra is a degeneration of the double affine Hecke algebra and an object of interest to many representation theorists\, it also has strong connections to integrable systems. In my talk I will discuss two subalgebras that arise from considering the invariants of the action of reductive subgroups of the special linear group. In particular we will examine the centres of these invariant subalgebras and compare with the algebra of invariants of the centre of the entire rational Cherednik algebra under the same groups. These subalgebras arise naturally in the study of rational Cherednik algebras\, one of which is the Dunkl angular momentum algebra and the other is generated by all degree zero elements. \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%b0-110/
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:20240222T140000
DTEND;TZID=Europe/Sofia:20240222T153000
DTSTAMP:20260407T093919
CREATED:20240222T092925Z
LAST-MODIFIED:20240222T092925Z
UID:15983-1708610400-1708615800@math.bas.bg
SUMMARY:Научен семинар на ВНЗ "Информационно моделиране"
DESCRIPTION:На 22 февруари (четвъртък)\, от 14 ч.\, в зала 503 на ИМИ-БАН\,\nще се проведе научен семинар на ВНЗ “Информационно моделиране”.\nДоклад на тема: \nИнтегриране на релационни данни и неструктурирани големи данни с подобен на SQL функционален език\nще изнесе гл. ас. д-р Боян Колев. \nРезюме: Polystore systems have been proposed to provide integrated access to multiple\, heterogeneous data stores through a single query engine. In particular\, much attention is being paid on the integration of relational data with unstructured big data typically stored in HDFS. One typical legacy solution is to use a relational query engine that allows SQL-like queries to retrieve data from HDFS\, which requires the system to provide a relational view of the unstructured data and hence is not always feasible. This talk presents an approach to overcome such limitations through a functional SQL-like query language that can integrate data retrieved from different data stores and take full advantage of the functionality of the underlying data processing frameworks by allowing the ad hoc usage of user-defined map/filter/reduce operators in combination with traditional SQL statements. Furthermore\, the query language allows for optimization by enabling subquery rewriting so that filter conditions can be pushed inside and executed at the data store as early as possible. The approach is validated with two data stores (an SQL database and the parallel data processing framework Apache Spark that operates on a distributed dataset) and a representative query that demonstrates the usability of the query language and evaluates the benefits from query optimization. \nЗа дистанционно включване: \nJoin Zoom Meeting\nhttps://us02web.zoom.us/j/81054245812?pwd=NDltMlpjbXRnUEZGeTRuZkt2Um9SZz09 \nMeeting ID: 810 5424 5812\nPasscode: 286884
URL:https://math.bas.bg/event/%d0%bd%d0%b0%d1%83%d1%87%d0%b5%d0%bd-%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%bd%d0%b0-%d0%b2%d0%bd%d0%b7-%d0%b8%d0%bd%d1%84%d0%be%d1%80%d0%bc%d0%b0%d1%86%d0%b8%d0%be%d0%bd%d0%bd%d0%be-%d0%bc-2/
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%98%D0%BD%D1%84%D0%BE%D1%80%D0%BC%D0%B0%D1%82%D0%B8%D1%87%D0%BD%D0%BE%20%D0%BC%D0%BE%D0%B4%D0%B5%D0%BB%D0%B8%D1%80%D0%B0%D0%BD%D0%B5%20%28%D0%92%D0%9D%D0%97%29":MAILTO:stoyan@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240217T090000
DTEND;TZID=Europe/Sofia:20240217T170000
DTSTAMP:20260407T093919
CREATED:20240105T123312Z
LAST-MODIFIED:20240105T123312Z
UID:15803-1708160400-1708189200@math.bas.bg
SUMMARY:Панаир на науката и иновациите – Innofair 2024
DESCRIPTION:На 17 февруари 2024 година (събота) ще се проведе ежегодният Панаир на науката и иновациите – Innofair 2024. \nКонкурсът е организиран от Института по математика и информатика в партньорство с Клуб Млади Таланти\, и е част от инициативите\, следващи традициите на Програма „Образование с наука“. \nНаучният панаир цели да открие научни таланти сред младежите на възраст 14-19 години\, да съдейства в бъдещото им развитие и да даде международен форум на идеите\, откритията и иновациите им. \nАвторите на най-добрите до 15 разработки ще бъдат поканени за представяне пред жури и публика на 17 февруари 2024 год. и ще бъдат наградени с грамота за отлично представяне. Представянето ще се проведе в София\, в зона „Ларго“ на Античен културно-комуникационен комплекс „Сердика“ (намира се под площад „Независимост“). \nСрок за подаване на разработките: 2 февруари 2024 г. \nФормуляр за регистрация попълнете тук: https://forms.gle/mXAKtC8MB5UXhUzg6 \nЗа въпроси и контакт с организаторите пишете на: kdelchev@math.bas.bg
URL:https://math.bas.bg/event/%d0%bf%d0%b0%d0%bd%d0%b0%d0%b8%d1%80-%d0%bd%d0%b0-%d0%bd%d0%b0%d1%83%d0%ba%d0%b0%d1%82%d0%b0-%d0%b8-%d0%b8%d0%bd%d0%be%d0%b2%d0%b0%d1%86%d0%b8%d0%b8%d1%82%d0%b5-innofair-2024/
LOCATION:Античен културно-комуникационен комплекс „Сердика“\, пл. Независимост"\, София\, Bulgaria
CATEGORIES:Изложба
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20240217
DTEND;VALUE=DATE:20240218
DTSTAMP:20260407T093919
CREATED:20240205T214200Z
LAST-MODIFIED:20240205T214200Z
UID:15937-1708128000-1708214399@math.bas.bg
SUMMARY:Конференция "Динамична математика в образованието"
DESCRIPTION:Секция “Образование по математика и информатика” на ИМИ-БАН организира еднодневна научно-практическа конференция “Динамична математика в образованието”\, която ще се проведе на 17 февруари 2024 година в ИМИ-БАН. Целта е да се сподели и анализира натрупаният опит от използването на динамични образователни среди в учебния процес (на всички равнища и в разнообразни форми). Участниците ще разполагат с 10 минути за представяне на своя разработка\, свързана с образованието по математика и информационни технологии\, която съдържа някаква динамична форма на представяне на учебно съдържание и/или провеждане на учебен процес. Разработките могат да се представят и като постер. Очакваме: \n\nразработки на основата на компютърни среди като GeoGebra\, GEONExT\, Elica\, Scratch\, Comenius Logo и др.;\nустройства и уреди за динамично представяне на математически факти;\nетюди\, сценки\, танци и други форми на изкуството.\n\nЕдна разработка\, подкрепяща внедряването на изследователския подход в образованието по математика\, ще бъде наградена. \nСрок за регистрация: 5 февруари 2024 г.\n \nПовече информация на сайта на конференцията: http://dmo.cabinet.bg/ \n 
URL:https://math.bas.bg/event/%d0%ba%d0%be%d0%bd%d1%84%d0%b5%d1%80%d0%b5%d0%bd%d1%86%d0%b8%d1%8f-%d0%b4%d0%b8%d0%bd%d0%b0%d0%bc%d0%b8%d1%87%d0%bd%d0%b0-%d0%bc%d0%b0%d1%82%d0%b5%d0%bc%d0%b0%d1%82%d0%b8%d0%ba%d0%b0-%d0%b2-%d0%be-6/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Конференция
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240214T160000
DTEND;TZID=Europe/Sofia:20240214T173000
DTSTAMP:20260407T093919
CREATED:20240212T133658Z
LAST-MODIFIED:20240212T133658Z
UID:15958-1707926400-1707931800@math.bas.bg
SUMMARY:Семинар по геометрия на МЦМН
DESCRIPTION:Следващата сбирка на Семинара по геометрия на МЦМН\nще се проведе в сряда\, 14 февруари 2024 г. от 16:00 ч. в зала 403 и онлайн в Zoom: \nДоклад на тема \nRefined curve counting\n\nще изнесе Михаил Школников\, ИМИ – БАН. \n\nZoom link:\n\nhttps://us02web.zoom.us/j/83740034721?pwd=VnBtcVpGUktscHQ4a09jZkNZTURyZz09\n\nAbstract: Refining an enumerative problem upgrades the numerical solution to a polynomial so that its specialization gives the original number. A prototypical example of such refinement arises in the tropical curve counting from replacing Mikhalkin multiplicities\, corresponding to counting complex curves\, with Block-Goettsche multiplicities. I will speak about the invariance of this count and its various interpretations.
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-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:20240214T140000
DTEND;TZID=Europe/Sofia:20240214T153000
DTSTAMP:20260407T093919
CREATED:20240212T233345Z
LAST-MODIFIED:20240212T234428Z
UID:15964-1707919200-1707924600@math.bas.bg
SUMMARY:Национален семинар по стохастика
DESCRIPTION:Поредната сбирка на \nНационалния семинар по стохастика\nще се проведе на 14 февруари 2024 г. (сряда) от 14:00 часа в зала 503 на ИМИ – БАН. \nДоклад на тема \nComputable inference for generalised Wright-Fisher processes\nще изнесе \nNathan Judd (University of Warwick\, UK). \nАбстракт.In this talk\, we will introduce a class of [0\,1]-valued Markov processes with jumps that\, as signals in hidden Markov models\, admits a computable (exact) filter. By computable filter we mean that each filtering distribution\, i.e.\, the law of the signal at a time t given the data up to time t\, is explicitly and exactly available as a finite mixture of Dirichlet distributions. We exploit the tractability of the Wright-Fisher diffusion\, in particular\, its infinite-sum transition function and its dual process\, as a base to construct a generalised version thereof\, for which we derive the (exact\, predictive and smoothing) filters of the associated hidden Markov model. In addition\, we construct an exact sampling scheme to draw samples from the transition functions of this process. \n\n 
URL:https://math.bas.bg/event/copy-%d0%bd%d0%b0%d1%86%d0%b8%d0%be%d0%bd%d0%b0%d0%bb%d0%b5%d0%bd-%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%bf%d0%be-%d1%81%d1%82%d0%be%d1%85%d0%b0%d1%81%d1%82%d0%b8%d0%ba%d0%b0/
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:20240213T140000
DTEND;TZID=Europe/Sofia:20240213T153000
DTSTAMP:20260407T093919
CREATED:20240209T094253Z
LAST-MODIFIED:20240209T094439Z
UID:15953-1707832800-1707838200@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Дата: 13.02.2024 г.\, 14:00 ч. \nМясто: Зала 403\, ИМИ – БАН \nДокладчик: Jean-Pierre Gazeau (APC\, Université Paris – Cité) \nДоклад: Quantum circuit complexity for light polarisation or complexity with no complex numbers \nДопълнителна информация: https://icms.bg/quantum-circuit-complexity-for-light-polarisation-or-complexity-with-no-complex-number-talk-by-jean-pierre-gazeau/ \nРезюме. I will present a form of quantum circuit complexity that extends to open systems. To illustrate the methodology\, I focus on a basic model where the Hilbert space of states is represented by the Euclidean plane. Specifically\, the investigation is about the dynamics of mixed quantum states as they undergo interactions with a sequence of gates. The approach involves the analysis of sequences of density matrices. Each density matrix evolves within the framework of a Gorini-Kossakowski-Lindblad-Sudarshan (GKLS) process during the time interval between consecutive gates. Notably\, when considering an upper limit for the cost function\, the optimal number of gates follows a power-law relationship.
URL:https://math.bas.bg/event/copy-%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/
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:20240208T150000
DTEND;TZID=Europe/Sofia:20240208T163000
DTSTAMP:20260407T093919
CREATED:20240205T104414Z
LAST-MODIFIED:20240206T152142Z
UID:15904-1707404400-1707409800@math.bas.bg
SUMMARY:Семинар на секция "Математически основи на информатиката"
DESCRIPTION:На 8 февруари 2024 г. (четвъртък) от 15:00 часа в зала 256 на ИМИ-БАН\nще се проведе заседание на семинара на секция\n„Математически основи на информатиката”. \nДоклад на тема \n Extremal problems in Euclidean combinatorial geometry\nще изнесе доц. д-р Данила Черкашин \nАбстракт.  I will talk about several problems in the intersection of extremal combinatorics and Euclidean geometry. Recent results on the Steiner tree problem\, Gilbert-Steiner problem\, and Nelson-Hadwiger problem will be presented. \nСеминарът може да бъде проследен и на https://meet.jit.si/IMI-MOI-14400
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%bd%d0%b0-%d1%81%d0%b5%d0%ba%d1%86%d0%b8%d1%8f-%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-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:20240208T140000
DTEND;TZID=Europe/Sofia:20240208T153000
DTSTAMP:20260407T093919
CREATED:20240205T115818Z
LAST-MODIFIED:20240205T120340Z
UID:15912-1707400800-1707406200@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Дата: 08.02.2024 г.\, 14:00 ч. \nМясто: Зала 403\, ИМИ – БАН \nДокладчик: Paul Horja\, University of Miami\, USA \nДоклад: A categorical view of singularity theory II \nДопълнителна информация: https://icms.bg/a-categorical-view-of-singularity-theory-i-and-ii-talks-by-paul-horja/ \nРезюме. The mirror symmetry phenomenon was discovered by string theorists more than thirty years ago as an equivalence of two physical theories associated with very different geometries. The categorical point of view on this remarkable conjecture was famously introduced by M. Kontsevich in his 1994 ICM talk. As it became clear over time\, homological mirror symmetry provides new approaches to many topics in symplectic and algebraic geometry. In these two talks\, I will present a brief overview of the conjecture as well as some results inspired by mirror symmetry and obtained in joint work with L. Katzarkov about classical problems on discriminants and singularity theory.
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-20/
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:20240207T160000
DTEND;TZID=Europe/Sofia:20240207T173000
DTSTAMP:20260407T093919
CREATED:20240205T211554Z
LAST-MODIFIED:20240205T211820Z
UID:15925-1707321600-1707327000@math.bas.bg
SUMMARY:Семинар по геометрия на МЦМН
DESCRIPTION:Следващата сбирка на Семинара по геометрия на МЦМН\nще се проведе в сряда\, 7 февруари 2024 г. от 16:00 ч. в зала 403 и онлайн в Zoom: \nДоклад на тема \nIntroduction to curve counting\n\nще изнесе Михаил Школников\, ИМИ – БАН. \n\nZoom link:\n\nhttps://us02web.zoom.us/j/83740034721?pwd=VnBtcVpGUktscHQ4a09jZkNZTURyZz09\n\nAbstract: This talk is intended as a very gentle introduction to the classical subject of enumerative geometry concerned with problems of counting algebraic curves with prescribed properties. In the realm of classical planimetry\, we know that there exists a single circle passing through a collection of three points\, provided that these points are generic. Here “generic” simply means that the points are not collinear\, i.e. don’t belong to the same line but could refer to some other open condition in a different context; the number of points is just right for a problem to be well-stated — there are infinitely many circles passing through any two points and a collection of four points lying on a circle is special. A less trivial example\, which will be considered in detail\, is the question “How many rational cubic curves on the plane pass through a generic collection of eight points?”. “Rational” here means that a curve has a parametrization by rational functions\, and “cubic” refers to a curve defined as a zero locus of a degree three polynomial. The number of points is again chosen just right so that one may expect a non-trivial answer. In the case of real algebraic geometry\, the number of cubics may vary depending on the position of the eight generic points\, and a priori it is even not clear if such curves exist for all configurations. On the other hand\, if we state the same problem over complex numbers the answer becomes definite and independent of the position of the generic points. By an elegant\, yet quite elementary\, topological reasoning we will deduce that this answer is 12. Adapting the same argument in the real case\, we will see that real rational cubics should be counted with signs and the result of this new count becomes a definite -8\, proving in particular that for any generic configuration of eight points on the real plane\, there exist at least eight rational real cubics passing through them.
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-8/
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:20240206T140000
DTEND;TZID=Europe/Sofia:20240206T153000
DTSTAMP:20260407T093920
CREATED:20240205T114758Z
LAST-MODIFIED:20240205T120046Z
UID:15908-1707228000-1707233400@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Дата: 06.02.2024 г.\, 14:00 ч. \nМясто: Зала 403\, ИМИ – БАН \nДокладчик: Paul Horja\, University of Miami\, USA \nДоклад: A categorical view of singularity theory I \nДопълнителна информация: https://icms.bg/a-categorical-view-of-singularity-theory-i-and-ii-talks-by-paul-horja/ \nРезюме. The mirror symmetry phenomenon was discovered by string theorists more than thirty years ago as an equivalence of two physical theories associated with very different geometries. The categorical point of view on this remarkable conjecture was famously introduced by M. Kontsevich in his 1994 ICM talk. As it became clear over time\, homological mirror symmetry provides new approaches to many topics in symplectic and algebraic geometry. In these two talks\, I will present a brief overview of the conjecture as well as some results inspired by mirror symmetry and obtained in joint work with L. Katzarkov about classical problems on discriminants and singularity theory.
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-19/
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:20240131T160000
DTEND;TZID=Europe/Sofia:20240131T173000
DTSTAMP:20260407T093920
CREATED:20240130T125552Z
LAST-MODIFIED:20240130T125552Z
UID:15893-1706716800-1706722200@math.bas.bg
SUMMARY:Семинар по геометрия на МЦМН
DESCRIPTION:Следващата сбирка на Семинара по геометрия на МЦМН\nще се проведе в сряда\, 31 януари 2024 г. от 16:00 ч. в зала 403 и онлайн в Zoom: \nДоклад на тема \nDerived Deformation Theory and Formal Moduli Problem\n\nще изнесе Инди Чин\, МЦМН и ИМИ – БАН. \n\nZoom link:\n\nhttps://us02web.zoom.us/j/83740034721?pwd=VnBtcVpGUktscHQ4a09jZkNZTURyZz09\n\nAbstract: Derived deformation theory studies the formal neighborhoods of moduli spaces. The classical work of Kodaira-Spencer on deformation of complex manifolds tells that the dg Lie algebra A^(0\,*)(X\,TX) controls the deformations of the complex manifold. The example illustrates the following general principle: A dg Lie algebra gives rise to a deformation functor by considering the  Maurer-Cartan elements of the dg Lie algebra tensoring with the maximal ideal of an Artin local ring. This idea is explored by many people\, including  Quillen\, Deligne\, Drinfeld\,  Kapranov and Kontesevich. Later\, Lurie and Pridham independently proved that the category of dg Lie algebra is indeed equivalent to the category of Formal Moduli problem. I will state their results and explain the idea of the proof.
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-7/
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:20240131T150000
DTEND;TZID=Europe/Sofia:20240131T163000
DTSTAMP:20260407T093920
CREATED:20240131T143833Z
LAST-MODIFIED:20240131T143833Z
UID:15897-1706713200-1706718600@math.bas.bg
SUMMARY:Семинар по Приложна математика
DESCRIPTION:Temporal networks\, Tensors\, and applications to ML\nДокладчик: проф. Огнян Кунчев\, ИМИ – БАН\nДата: 31.01.2024 г.\nЧас: 15:00 ч.\nМясто: … \nРезюме: Recently\, temporal networks got an increasing interest\, related to their numerous applications in real-life data analysis. The temporal networks (more mathematically\, “graphs depending on time”) are a typical example of a Tensor – the adjacency matrix depends on several parameters and is a tensor (in the mathematical sense of the word). We present some recent results about the structure of the spectrum of the normalized Laplacian in the case of “slowly varying temporal networks”. The detailed structure of the spectrum gives rise of the notion of “constant block Jacobi model”\, which has closed-form solution for the spectrum and the eigenfunctions. This brings a reconsideration of the notion of Fiedler vector for temporal networks. Depending on the time\, some discussion about the recent history of Tensors (mathematical sense) and their application in ML may be presented. \nФейсбук страница на семинара: Семинар по Приложна математика \nСеминарът ще бъде излъчен и по Zoom:\nhttps://us02web.zoom.us/j/85916659659?pwd=dFQxaDdPaWVLbVNhcFcwdUxTZWhoQT09
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%b0-8/
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:20240130T140000
DTEND;TZID=Europe/Sofia:20240130T153000
DTSTAMP:20260407T093920
CREATED:20240126T111458Z
LAST-MODIFIED:20240126T111458Z
UID:15887-1706623200-1706628600@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Дата: 30.01.2024 г.\, 14:00 ч. \nМясто: Зала 403\, ИМИ – БАН \nДокладчик: Владимир Митанкин\, ИМИ – БАН \nДоклад: Density of Hasse failures for diagonal affine cubic surfaces \nДопълнителна информация: https://icms.bg/density-of-hasse-failures-for-diagonal-affine-cubic-surfaces-a-talk-by-vladimir-mitankin/ \nРезюме. А question of Mordell asks which integers are the sum of three cubes provided that there are no local obstructions to that. While Mordell’s question seems out of reach with the current machinery\, it is widely believed that every integer not congruent to 4 or 5 mod 9 is a sum of three integral cubes. If\, instead of the sum of three cubes\, a general ternary cubic is considered\, local conditions no longer suffice for solubility\, i.e. the integral Hasse principle may fail. In this talk we shall apply the integral version of the Brauer-Manin obstruction to construct the first examples of such failures not explained by local conditions in the setting of affine diagonal ternary cubics. We will then explore in three different natural ways how such failures are distributed across the family of affine diagonal ternary cubics. \nThis talk is based on a joint work with Harkaran Uppal and Julian Lyczak.
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-18/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
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BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240129T143000
DTEND;TZID=Europe/Sofia:20240129T160000
DTSTAMP:20260407T093920
CREATED:20240123T102212Z
LAST-MODIFIED:20240123T102212Z
UID:15882-1706538600-1706544000@math.bas.bg
SUMMARY:Семинар "Дидактическо моделиране"
DESCRIPTION:Поредната сбирка на семинара \nДидактическо моделиране\nще се проведе на 29.01.2024 г. от 14:30 ч. в зала 278 на ИМИ. \nДоклад на тема \nЛюбопитно за конструирането на „вечни календари“\nще изнесe \nдоц. Валентин Христов.
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%b4%d0%b8%d0%b4%d0%b0%d0%ba%d1%82%d0%b8%d1%87%d0%b5%d1%81%d0%ba%d0%be-%d0%bc%d0%be%d0%b4%d0%b5%d0%bb%d0%b8%d1%80%d0%b0%d0%bd%d0%b5-36/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
END:VEVENT
END:VCALENDAR