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X-WR-CALNAME:Institute of Mathematics and Informatics
X-ORIGINAL-URL:https://math.bas.bg
X-WR-CALDESC:Събития за Institute of Mathematics and Informatics
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TZID:Europe/Sofia
BEGIN:DAYLIGHT
TZOFFSETFROM:+0200
TZOFFSETTO:+0300
TZNAME:EEST
DTSTART:20250330T010000
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BEGIN:STANDARD
TZOFFSETFROM:+0300
TZOFFSETTO:+0200
TZNAME:EET
DTSTART:20251026T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20250602T143500
DTEND;TZID=Europe/Sofia:20250602T160000
DTSTAMP:20260704T000948
CREATED:20250527T191808Z
LAST-MODIFIED:20250527T191826Z
UID:17818-1748874900-1748880000@math.bas.bg
SUMMARY:Семинар "Дидактическо моделиране"
DESCRIPTION:Поредната сбирка на семинара \nДидактическо моделиране\nще се проведе на 02.06.2025 г. от 14:35 ч. в зала 278 на ИМИ. \nДоклад на тема \nФакториели на полиноми – ученическо изследване с обширна съвкупност от концепции в теория на числата\nще изнесe \nМирослав Маринов.
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%b5-42/
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:20250603T140000
DTEND;TZID=Europe/Sofia:20250603T153000
DTSTAMP:20260704T000948
CREATED:20250530T114116Z
LAST-MODIFIED:20250530T114116Z
UID:17828-1748959200-1748964600@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Семинарът на МЦМН продължава със серия от четири лекции на д-р Петър Далаков\, както следва: \nДати: 3\, 6\, 10\, 13-ти юни\, 14:00 часа \nМясто: стая 403\, ИМИ-БАН \nЛектор: Петър Далаков (ИМИ и АУБГ) \nТема: Special Kaehler Geometry and some applications \nРезюме: In this short sequence of lectures we will discuss the notion of special Kaehler structure and some of its links to complex algebraic geometry\, in particular\, complex Lagrangians\, variations of Hodge structures and algebraic integrable systems. The sequence will conclude with examples related to various moduli spaces of Higgs bundles on curves. \nПовече информация можете да намерите на страницата на семинара:\nhttps://icms.bg/category/icms-seminar/
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-32/
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:20250603T150000
DTEND;TZID=Europe/Sofia:20250603T163000
DTSTAMP:20260704T000948
CREATED:20250530T121702Z
LAST-MODIFIED:20250530T121702Z
UID:17846-1748962800-1748968200@math.bas.bg
SUMMARY:Семинар по Приложна математика
DESCRIPTION:Следващата сбирка на Семинара по приложна математика ще се проведе на 03.06.2025 г. от 15:00 в онлайн среда:\nJoin Zoom Meeting\nhttps://us02web.zoom.us/j/87588684853?pwd=4xPgBSVfxBwjV4P8hrsHn2rN9gWQGB.1\nMeeting ID: 875 8868 4853\nPasscode: 711528\nA generalization of Meijer’s G function motivated by probability\nДокладчик: Dmitrii Karp \nРезюме: Meijer’s G function appeared in probability in 1930-ies even before Meijer’s work as the density of the product of independent beta variables and as the density of the likelihood ratio test for samples drawn from many classical probability distributions. It is defined by a contour integral of the appropriate ratio of gamma products (sometimes reducible to the inverse Mellin transform). Replacing the Euler gamma function by the Barnes double gamma function in this contour integral\, we introduce a new family of special functions which we call Mellin-Barnes’ K function. It is a quite general family which contains Meijer’s G function (thus also all classical hypergeometric functions pFq)\, as well as several new functions that appeared recently in the study of random processes and the fractional fenomena. For example\, the running supremum of an alpha-stable Levy process has density expressible by K function as well as does the exponential functionals of the hypergeometric process. In the talk\, we will discuss the definition of the new function\, its basic analytic and transformation properties and relations to the functions found in the literature. We further define a generalization of the Kilbas-Saigo function introduced earlier to solve in closed form certain classes of integral and differential equations of fractional order and observe that both the original and the generalized Kilbas-Saigo functions are special cases of our new function. \nThe talk is based on a joint work with Alexey Kuznetsov (York University\, Toronto\, Canada). \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%b0-14/
LOCATION:Zoom
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:20250606T123000
DTEND;TZID=Europe/Sofia:20250606T140000
DTSTAMP:20260704T000948
CREATED:20250530T123427Z
LAST-MODIFIED:20250530T123427Z
UID:17850-1749213000-1749218400@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 6 юни 2025 г. (петък) от 12:30 часа в зала 578 на ИМИ\nи онлайн чрез платформата zoom ще се проведе хибридно заседание на семинара по „Алгебра и логика”. \nДоклад на тема: \nHolographic probe branes and artificial neural networks\nще изнесе \nВеселин Филев (ИМИ-БАН).\nРезюме: In holography\, flavour probe branes are used to introduce fundamental matter to the AdS/CFT correspondence. At a technical level\, the probes are described by extremizing the DBI action and solving the Lagrange–Euler equations of motion. I will report on applications of artificial neural networks that allow direct minimization of the regularized DBI action (interpreted as a free energy) without the need to derive and solve the equations of motion. I will consider\, as examples\, magnetic catalysis of chiral symmetry breaking and the meson melting phase transition in the D3/D7 holographic set-up. \n\nЛинк към zoom-стаята на семинара:\nHttps://us02web.zoom.us/j/85137375021?pwd=RE5QczdFTE1xL1R6MnI2b1lkcGczQT09\nПоканват се всички желаещи да присъстват. \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%b0-121/
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:20250606T140000
DTEND;TZID=Europe/Sofia:20250606T153000
DTSTAMP:20260704T000948
CREATED:20250530T115133Z
LAST-MODIFIED:20250530T115133Z
UID:17831-1749218400-1749223800@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Семинарът на МЦМН продължава със серия от четири лекции на д-р Петър Далаков\, както следва: \nДати: 3\, 6\, 10\, 13-ти юни\, 14:00 часа \nМясто: стая 403\, ИМИ-БАН \nЛектор: Петър Далаков (ИМИ и АУБГ) \nТема: Special Kaehler Geometry and some applications \nРезюме: In this short sequence of lectures we will discuss the notion of special Kaehler structure and some of its links to complex algebraic geometry\, in particular\, complex Lagrangians\, variations of Hodge structures and algebraic integrable systems. The sequence will conclude with examples related to various moduli spaces of Higgs bundles on curves. \nПовече информация можете да намерите на страницата на семинара:\nhttps://icms.bg/category/icms-seminar/
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-33/
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:20250606T140000
DTEND;TZID=Europe/Sofia:20250606T170000
DTSTAMP:20260704T000948
CREATED:20250605T152545Z
LAST-MODIFIED:20250605T152545Z
UID:17864-1749218400-1749229200@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:The ICMS Seminar will meet this Friday\, June 6-th\, at 14:00\, with three lectures by\nPeter Dalakov\, Lyudmil Katzarkov and Ernesto Lupercio from IMI-BAS. \nThe schedule is the following. \nJune 6-th. Room 403 IMI-BAS. \n14:00 – 14:50.  Peter Dalakov\nSpecial Kaehler Geometry and some applications (Part II) \n15:00 – 15:50.  Lyudmil Katzarkov\nAtoms and Minimal Model Program \n16:00 – 16:50. Ernesto Lupercio\nElliptic genus and applications \nAbstracts and more information can be found at\nhttps://icms.bg/category/icms-seminar/
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-36/
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:20250610T140000
DTEND;TZID=Europe/Sofia:20250610T153000
DTSTAMP:20260704T000948
CREATED:20250530T115318Z
LAST-MODIFIED:20250530T115318Z
UID:17835-1749564000-1749569400@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Семинарът на МЦМН продължава със серия от четири лекции на д-р Петър Далаков\, както следва: \nДати: 3\, 6\, 10\, 13-ти юни\, 14:00 часа \nМясто: стая 403\, ИМИ-БАН \nЛектор: Петър Далаков (ИМИ и АУБГ) \nТема: Special Kaehler Geometry and some applications \nРезюме: In this short sequence of lectures we will discuss the notion of special Kaehler structure and some of its links to complex algebraic geometry\, in particular\, complex Lagrangians\, variations of Hodge structures and algebraic integrable systems. The sequence will conclude with examples related to various moduli spaces of Higgs bundles on curves. \nПовече информация можете да намерите на страницата на семинара:\nhttps://icms.bg/category/icms-seminar/
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-34/
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:20250613T140000
DTEND;TZID=Europe/Sofia:20250613T170000
DTSTAMP:20260704T000948
CREATED:20250530T115921Z
LAST-MODIFIED:20250612T122953Z
UID:17840-1749823200-1749834000@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Семинарът на МЦМН продължава със серия от четири лекции на д-р Петър Далаков\, както следва: \nДата: 13-ти юни  \nМясто: стая 403\, ИМИ-БАН \n14:00 – 15:30.  Peter Dalakov\nSpecial Kaehler geometry and some applications (Part IV) \n16:00 – 17:00. Ernesto Lupercio\nElliptic genera and the geometry of loop spaces and applications \nРезюмета и допълнителна информация можете да намерите на страницата на семинара:\nhttps://icms.bg/category/icms-seminar/
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-35/
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:20250620T153000
DTEND;TZID=Europe/Sofia:20250620T180000
DTSTAMP:20260704T000948
CREATED:20250616T133106Z
LAST-MODIFIED:20250616T133123Z
UID:17940-1750433400-1750442400@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Следващото заседание на семинара на МЦМН ще се състои в петък\, с доклади на Алексанър Стоколос и Ернесто Луперсио. \nICMS Seminar\nFriday\, June 20-th. Room 403 IMI-BAS. \n15:30 – 16:30.  Alexander Stokolos (Georgia Southern University)\nOn extremal polynomials \nAbstract: I will present known and new polynomials emerging from the extremal problems of geometric complex analysis. \n16:45 – 17:45. Ernesto Lupercio (IMI-BAS and Cinvestav IPN México)\nAnalysis in Loop Spaces and Genera \nAbstract: Analysis on loop spaces\, motivated by ideas from conformal field theory\, leads naturally to the construction of elliptic genera—topological invariants with deep modular and representation-theoretic properties. \nМore information can be found at the seminar’s website\nhttps://icms.bg/category/icms-seminar/
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-37/
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:20250703T143000
DTEND;TZID=Europe/Sofia:20250703T160000
DTSTAMP:20260704T000948
CREATED:20250629T234532Z
LAST-MODIFIED:20250629T234532Z
UID:17976-1751553000-1751558400@math.bas.bg
SUMMARY:Семинар "Математически основи на информатиката"
DESCRIPTION:Семинарът по \nМАТЕМАТИЧЕСКИ ОСНОВИ НА ИНФОРМАТИКАТА \nорганизиран от \nСекция „Математически основи на информатиката“ към ИМИ – БАН и \nФакултет „Математика и информатика“ – ВТУ\, \nВи кани на поредната сбирка на 3 юли 2025 г. от 14:30 часа в зала 508 на учебен корпус 4 на ВТУ\, на която \nСветослава Минкова\nмагистърска програма\n„Математически структури в информационната сигурност“\nФМИ\, Великотърновски университет \nще изнесе доклад на тема: \nWeisfeiler-Leman алгоритъм и инварианти за изоморфизъм на графи
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-5/
LOCATION:Великотърновски университет\, ул. "Теодосий Търновски" № 2\, Велико Търново\, 5005\, Bulgaria
CATEGORIES:Редовен семинар
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20250709T160000
DTEND;TZID=Europe/Sofia:20250709T173000
DTSTAMP:20260704T000948
CREATED:20250707T123438Z
LAST-MODIFIED:20250707T123502Z
UID:18003-1752076800-1752082200@math.bas.bg
SUMMARY:Семинар по геометрия на МЦМН
DESCRIPTION:Следващата сбирка на Семинара по геометрия на МЦМН ще се състои в сряда\, 9 юли\, от 16:00 ч. в зала 403 и онлайн в Zoom:\n\nhttps://icms.bg/around-combinatorial-viros-patchworking-geometry-seminar-talk-by-arthur-renaudineau/\n\n\nZoom link:\nhttps://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1
URL:https://math.bas.bg/event/icms-geometry-seminar/
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:20250715T130000
DTEND;TZID=Europe/Sofia:20250715T143000
DTSTAMP:20260704T000948
CREATED:20250711T123522Z
LAST-MODIFIED:20250711T125611Z
UID:18007-1752584400-1752589800@math.bas.bg
SUMMARY:Общ семинар на секция "Анализ\, геометрия и топология" и МЦМН
DESCRIPTION:На 15 юли 2025 г. от 13:00 часа в зала 403 на ИМИ-БАН ще се проведе съвместно заседание на Общия семинар на секция “Анализ\, геометрия и топология” и Международния център по математически науки (ICMS-Sofia). \nДоклад на тема: \nWeak Metric Structures on Generalized Riemannian Manifolds\nще изнесе Milan Zlatanovic\, University of Niš\, Serbia. \nРезюме. Linear connections with torsion are important in the study of generalized Riemannian manifolds (\(M\)\, \(G=g+F\))\, where the symmetric part \(g\) of \(G\) is a non-degenerate (0\,2)-tensor and \(F\) is the skew-symmetric part. Some space-time models in theoretical physics are based on \((M\, G=g+F)\)\, where \(F\) is defined using a complex structure. In the lecture\, we will show more general models\, where \(F\) has constant rank and is based on weak metric structures (introduced by the V. Rovenski and R. Wolak)\, which generalize almost contact and \(f\)-contact structures. We consider metric connections (i.e.\, preserving \(G\)) with totally skew-symmetric torsion tensor. For \(\mbox{rank}(F)= \mbox{dim} M\) and non-conformal tensor \(A^2\)\, where \(A\) is a skew-symmetric (1\,1)-tensor adjoint to \(F\)\, we apply weak almost Hermitian structures to fundamental results (by S. Ivanov and M. Zlatanovic) on generalized Riemannian manifolds and prove that the manifold is a weighted product of several nearly Kahler manifolds corresponding to eigen-distributions of \(A^2\). For \(\mbox{rank}(F)< \mbox{dim} M\) we apply weak \(f\)-structures and obtain splitting results for generalized Riemannian manifolds.\n(This is joint work with Vladimir Rovenski\, Department of Mathematics\, University of Haifa). \nПосещението на лектора е финансирано по Научна програма “Повишаване на изследователския капацитет в областта на математическите науки (ПИКОМ)”\, № ДО1-67/05.05.2022. \n\n 
URL:https://math.bas.bg/event/%d0%be%d0%b1%d1%89-%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%b0%d0%bd%d0%b0%d0%bb%d0%b8%d0%b7-%d0%b3%d0%b5%d0%be%d0%bc%d0%b5%d1%82%d1%80%d0%b8-24/
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%BD%D0%B0%D0%BB%D0%B8%D0%B7%2C%20%D0%B3%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%8F%20%D0%B8%20%D1%82%D0%BE%D0%BF%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D1%8F":MAILTO:vmil@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20250722T130000
DTEND;TZID=Europe/Sofia:20250722T143000
DTSTAMP:20260704T000948
CREATED:20250717T082026Z
LAST-MODIFIED:20250717T082804Z
UID:18028-1753189200-1753194600@math.bas.bg
SUMMARY:Общ семинар на секция "Анализ\, геометрия и топология" и МЦМН
DESCRIPTION:Съвместна сбирка на семинара на МЦМН и семинара “Анализ\, геометрия и топология” в ИМИ\, София\, ще се проведе идния вторник\, с доклад на Elia Fusi\, както следва.\n\nВторник\, 22-ри юли\, 13:00 часа\, зала 403 на ИМИ-БАН.\nElia Fusi\, University of Torino:\nSpecial metrics in hypercomplex geometry\n\nAbstract:The existence of special hyperHermitian metrics plays an important role in the study of hypercomplex manifolds. In this talk\, after a brief overview of the basic definitions in hypercomplex Geometry\, we will discuss two of the main types of special metrics in the hypercomplex setting: quaternionic Gauduchon and strong HKT metrics. First of all\, we will discuss sufficient and equivalent conditions for a quaternionic Gauduchon metric to exist.  Afterwards\, we will show that strong HKT and balanced hyperHermitian metrics cannot coexist on a compact non-hyperKähler manifold\, proving a particular instance of the Fino-Vezzoni conjecture. Finally\, we will introduce an Einstein condition for hyperHermitian metrics and describe the similarities with the Kähler-Einstein case.\nThis is a joint work with Giovanni Gentili.\n \nПовече информация можете да намерите на страницата на семинара:\nhttps://icms.bg/category/icms-seminar/\n 
URL:https://math.bas.bg/event/%d0%be%d0%b1%d1%89-%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%b0%d0%bd%d0%b0%d0%bb%d0%b8%d0%b7-%d0%b3%d0%b5%d0%be%d0%bc%d0%b5%d1%82%d1%80%d0%b8-25/
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%BD%D0%B0%D0%BB%D0%B8%D0%B7%2C%20%D0%B3%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%8F%20%D0%B8%20%D1%82%D0%BE%D0%BF%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D1%8F":MAILTO:vmil@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20250722T130000
DTEND;TZID=Europe/Sofia:20250722T143000
DTSTAMP:20260704T000948
CREATED:20250728T205435Z
LAST-MODIFIED:20250728T210027Z
UID:18052-1753189200-1753194600@math.bas.bg
SUMMARY:Общ семинар на секция "Анализ\, геометрия и топология"
DESCRIPTION:Семинар “Анализ\, геометрия и топология”\nВторник\, 22 юли 2025 г.\, 13:00 ч.\, зала 403 на ИМИ – БАН.\nElia Fusi\, University of Torino.\nSpecial metrics in hypercomplex geometry\n\nРезюме: The existence of special hyperHermitian metrics plays an important role in the study of hypercomplex manifolds. In this talk\, after a brief overview of the basic definitions in hypercomplex Geometry\, we will discuss two of the main types of special metrics in the hypercomplex setting: quaternionic Gauduchon and strong HKT metrics. First of all\, we will discuss sufficient and equivalent conditions for a quaternionic Gauduchon metric to exist.  Afterwards\, we will show that strong HKT and balanced hyperHermitian metrics cannot coexist on a compact non-hyperKähler manifold\, proving a particular instance of the Fino-Vezzoni conjecture. Finally\, we will introduce an Einstein condition for hyperHermitian metrics and describe the similarities with the Kähler-Einstein case.\nThis is a joint work with Giovanni Gentili.
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%b0%d0%bd%d0%b0%d0%bb%d0%b8%d0%b7-%d0%b3%d0%b5%d0%be%d0%bc%d0%b5%d1%82%d1%80%d0%b8%d1%8f-%d0%b8-%d1%82%d0%be%d0%bf%d0%be%d0%bb%d0%be%d0%b3%d0%b8%d1%8f/
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%BD%D0%B0%D0%BB%D0%B8%D0%B7%2C%20%D0%B3%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%8F%20%D0%B8%20%D1%82%D0%BE%D0%BF%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D1%8F":MAILTO:vmil@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20250724T140000
DTEND;TZID=Europe/Sofia:20250724T153000
DTSTAMP:20260704T000948
CREATED:20250717T081421Z
LAST-MODIFIED:20250717T081421Z
UID:18024-1753365600-1753371000@math.bas.bg
SUMMARY:Семинар "Математически основи на информатиката"
DESCRIPTION:Следващата сбирка на семинара на секция \nМАТЕМАТИЧЕСКИ ОСНОВИ НА ИНФОРМАТИКАТА \nще се състои в сряда\, 24.07.2025\, от 14:00 часа\, в зала 403 на ИМИ\, на която \nпроф. Марк Айуън\nще изнесе доклад на тема: \nSparse Spectral Methods for Solving High-Dimensional and Multiscale Elliptic PDEs\nПроф. Айуън работи в департамента по изчислителна математика в Michigan State University и има широки интереси свързани с обработката на данни и обработката на сигнали. Темата\, която предложи за семинара има някои неочаквани връзки с определени шумозащитни кодове.\nРезюме. In his monograph “Chebyshev and Fourier Spectral Methods”\, John Boyd claimed that\, regarding Fourier spectral methods for solving differential equations\, “[t]he virtues of the Fast Fourier Transform will continue to improve as the relentless march to larger and larger [bandwidths] continues” [1\, pg. 194]. This talk will discuss attempts to further the virtue of the Fast Fourier Transform (FFT) as not only bandwidth is pushed to its limits\, but also the dimension of the problem. Instead of using the traditional FFT however\, we make a key substitution from the sublinear-time compressive sensing literature: a high-dimensional\, sparse Fourier transform (SFT) paired with randomized rank-1 lattice methods. The resulting sparse spectral method rapidly and automatically determines a set of Fourier basis functions whose span is guaranteed to contain an accurate approximation of the solution of a given elliptic PDE. This much smaller\, near-optimal Fourier basis is then used to efficiently solve the given PDE in a runtime which only depends on the PDE’s data/solution compressibility and ellipticity properties\, while breaking the curse of dimensionality and relieving linear dependence on any multiscale structure in the original problem. Theoretical performance of the method is established with convergence analysis in the Sobolev norm for a general class of nonconstant diffusion equations\, as well as pointers to technical extensions of the convergence analysis to more general advection-diffusion-reaction equations. Numerical experiments demonstrate good empirical performance on several multiscale and high-dimensional example problems\, further showcasing the promise of the proposed methods in practice.
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-6/
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:20250725T130000
DTEND;TZID=Europe/Sofia:20250725T143000
DTSTAMP:20260704T000948
CREATED:20250724T082116Z
LAST-MODIFIED:20250724T082116Z
UID:18045-1753448400-1753453800@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 25 юли 2025 г. (петък) от 13:00 часа в зала 578 на ИМИ\nще се проведе присъствено заседание на семинара по „Алгебра и логика”. \nДоклад на тема: \nDistinctness of the “lifted” Kloosterman sums over the prime field Fp\nще изнесе \nЛюбомир Борисов (ИМИ-БАН).\nРезюме \n\nПоканват се всички желаещи да присъстват. \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%b0-122/
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:20250729T130000
DTEND;TZID=Europe/Sofia:20250729T143000
DTSTAMP:20260704T000948
CREATED:20250728T210248Z
LAST-MODIFIED:20250728T210325Z
UID:18057-1753794000-1753799400@math.bas.bg
SUMMARY:Общ семинар на секция "Анализ\, геометрия и топология"
DESCRIPTION:Семинар “Анализ\, геометрия и топология”\nВторник\, 29 юли 2025 г.\, 13:00 ч.\, зала 403 на ИМИ – БАН.\n\nSpeaker: Asia Mainenti\, IMI and ICMS\, Sofia\n\nHodge-Riemann balanced structures on non-Kähler manifolds\n\nРезюме:  A Hodge-Riemann balanced structure on a complex manifold is the datum of a balanced metric whose (n-1)-th power can be decomposed into the wedge product of two differential forms\, satisfying the classical Hodge-Riemann bilinear relations. Such structures were introduced by X. Chen and R. Wentworth\, to generalize the nonabelian Hodge correspondence to non-Kähler Hermitian metrics. However\, there are no known examples of Hodge-Riemann balanced structures on non-Kähler manifolds. The aim of this talk is to address this lack of examples\, highlighting the relation with p-Kähler structures and discuss some obstruction results in the class of solvmanifolds. Lastly\, we will present the first example of such a structure on a non-Kähler\, non-compact complex manifold obtained as the product of the Iwasawa manifold by C. This is joint work with A. Fino.
URL:https://math.bas.bg/event/%d0%be%d0%b1%d1%89-%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%b0%d0%bd%d0%b0%d0%bb%d0%b8%d0%b7-%d0%b3%d0%b5%d0%be%d0%bc%d0%b5%d1%82%d1%80%d0%b8-26/
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%BD%D0%B0%D0%BB%D0%B8%D0%B7%2C%20%D0%B3%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%8F%20%D0%B8%20%D1%82%D0%BE%D0%BF%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D1%8F":MAILTO:vmil@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20250820T160000
DTEND;TZID=Europe/Sofia:20250820T173000
DTSTAMP:20260704T000948
CREATED:20250818T105042Z
LAST-MODIFIED:20250818T105042Z
UID:18161-1755705600-1755711000@math.bas.bg
SUMMARY:Семинар по геометрия на МЦМН
DESCRIPTION:Следващата сбирка на Семинара по геометрия на МЦМН ще се състои в сряда\, 20 август\, от 16:00 ч. в зала 403 и онлайн в Zoom:\n\nFriezes\, Geometry seminar talk by Andrei Zabolotskii \n\nZoom link:\n\nhttps://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1
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-16/
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:20250923T140000
DTEND;TZID=Europe/Sofia:20250923T170000
DTSTAMP:20260704T000948
CREATED:20250920T162124Z
LAST-MODIFIED:20250920T162124Z
UID:18227-1758636000-1758646800@math.bas.bg
SUMMARY:Семинар на МЦМН: Recent Developments on Tropical Sandpiles and Related Subjects
DESCRIPTION:The International Center for Mathematical Sciences – Sofia (ICMS-Sofia) \npresents\nRecent Developments on Tropical Sandpiles\nand Related Subjects\nTuesday\, 23 September and Thursday\, 25 September 2025 \nICMS-Sofia\, Room 403 and via Zoom \n\n\n\nYou may find the details here:\nhttps://icms.bg/recent-developments-on-tropical-sandpiles-and-related-subjects/\n\nIn addition\, we plan to have a “round table” meeting at room 378 on Wednesday\, September 24\, at 14:00\, to openly exchange ideas while enjoying drinks and snacks.
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-recent-developments-on-tropical-sandpiles-and-related-subjects/
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:20250925T140000
DTEND;TZID=Europe/Sofia:20250925T170000
DTSTAMP:20260704T000948
CREATED:20250920T162350Z
LAST-MODIFIED:20250920T162350Z
UID:18230-1758808800-1758819600@math.bas.bg
SUMMARY:Семинар на МЦМН: Recent Developments on Tropical Sandpiles and Related Subjects
DESCRIPTION:The International Center for Mathematical Sciences – Sofia (ICMS-Sofia) \npresents\nRecent Developments on Tropical Sandpiles\nand Related Subjects\nTuesday\, 23 September and Thursday\, 25 September 2025 \nICMS-Sofia\, Room 403 and via Zoom \n\n\n\nYou may find the details here:\nhttps://icms.bg/recent-developments-on-tropical-sandpiles-and-related-subjects/\n\nIn addition\, we plan to have a “round table” meeting at room 378 on Wednesday\, September 24\, at 14:00\, to openly exchange ideas while enjoying drinks and snacks.
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-recent-developments-on-tropical-sandpiles-and-related-subjects-2/
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:20250930T110000
DTEND;TZID=Europe/Sofia:20250930T123000
DTSTAMP:20260704T000948
CREATED:20250924T131241Z
LAST-MODIFIED:20250924T131548Z
UID:18237-1759230000-1759235400@math.bas.bg
SUMMARY:Съвместно заседание на семинарите на секция АГТ и МЦМН
DESCRIPTION:Съвместен семинар на секция “Анализ\, геометрия и топология”\nи Международния център за математически науки – София (МЦМН-София) \nConcircularly Semi-Symmetric Metric Connection\nMiroslav Maksimović \nУниверситет на Прищина в Косовска Митровица\, Косовска Митровица\, Сърбия\, и\nИнститут по математика и информатика\, Българска академия на науките \n30 септември 2025 г.\, 11:00 ч. – Зала 403 \nРезюме. A concircularly semi-symmetric metric connection is a special class of semi-symmetric metric connection when its generator is a concircular vector. In this talk\, we will present results on this connection on pseudo-Riemannian manifolds\, and in particular\, we will observe the application to Lorentzian manifolds and the theory of relativity. We demonstrate that a Lorentzian manifold reduces to a GRW space-time when the generator of the observed connection is a unit timelike vector. At the same time\, the mentioned connection becomes a semi-symmetric metric P-connection. At the end\, we determine the equation of state on a perfect fluid space-time. These are the results of a joint work with prof. Milan Zlatanović published in J. Geom. Phys. 217 (2025). \nThe lecturer is supported by the Scientific Programme “Enhancing the Research Capacity in Mathematical Sciences (PIKOM)”\, No. DO1-67/05.05.2022.
URL:https://math.bas.bg/event/%d1%81%d1%8a%d0%b2%d0%bc%d0%b5%d1%81%d1%82%d0%b5%d0%bd-%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%b0%d0%b3%d1%82-%d0%b8-%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
ORGANIZER;CN="%D0%A1%D0%B5%D0%BA%D1%86%D0%B8%D1%8F%20%D0%90%D0%BD%D0%B0%D0%BB%D0%B8%D0%B7%2C%20%D0%B3%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%8F%20%D0%B8%20%D1%82%D0%BE%D0%BF%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D1%8F":MAILTO:vmil@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20251003T130000
DTEND;TZID=Europe/Sofia:20251003T143000
DTSTAMP:20260704T000948
CREATED:20250930T115707Z
LAST-MODIFIED:20250930T115707Z
UID:18277-1759496400-1759501800@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 3 октомври 2025 г. (петък) от 13:00 часа в зала 578 на ИМИ-БАН и онлайн чрез платформата zoom\nще се проведе хибридно заседание на семинара по „Алгебра и логика”. \nДоклад на тема: \nDecomposition of Tschirnhausen Modules for Coverings on Decomposable P1-Bundles\nще изнесе \nХристо Илиев (Американски университет в България и ИМИ-БАН).\nРезюме \n\nЛинк към zoom-стаята на семинара:\nHttps://us02web.zoom.us/j/85137375021?pwd=RE5QczdFTE1xL1R6MnI2b1lkcGczQT09\n\nПоканват се всички желаещи да присъстват. \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%b0-123/
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:20251010T130000
DTEND;TZID=Europe/Sofia:20251010T143000
DTSTAMP:20260704T000948
CREATED:20251006T201908Z
LAST-MODIFIED:20251006T201908Z
UID:18315-1760101200-1760106600@math.bas.bg
SUMMARY:Съвместно заседание на семинара "Алгебра и логика" и семинара на секция ДУМФ
DESCRIPTION:На 10 октомври 2025 г. (петък) от 13:00 часа в зала 578 на ИМИ-БАН и онлайн чрез платформата zoom ще се проведе съвместно заседание на семинара по Алгебра и логика и на семинара на секция “Диференциални уравнения и математическа физика”. \nДоклад на тема \nOn Z5 reduction of soliton equations related to sl(5) algebra\n ще изнесе \nВладимир Герджиков (ИМИ-БАН)\, \nсъвместна работа с Б. Костадинов (ИМИ-БАН)\, С. Мишев (НБУ) и А. Стефанов (ФМИ-СУ). \nРезюме: Recently a new approach to the integrable systems\, extending and generalizing the ISM was formulated. It is based on an effective parametrization of the Riemann-Hilbert problem\, which allows one to extend the class of Lax pairs and effectively derive only the corresponding NLEE as compatibility condition of two linear problems. This method is based on the possibility to treat the solution of the RHP as a fundamental analytic solution of the Lax pair\, and then to apply the dressing Zakharov-Shabat method for deriving the soliton solutions of the NLEE. The aim of the present paper is to extend Mikhailov Z5 reduction group to the parametrization of the Z5 RHP. The NLEE that we obtained are dispersionless. \n\nPublished in Journal of Physics: Conference Series\, Vol. 3002:(1)\, id. 012014\, 14 pp. \nЛинк към zoom-стаята на семинара:\nHttps://us02web.zoom.us/j/85137375021?pwd=RE5QczdFTE1xL1R6MnI2b1lkcGczQT09 \nПоканват се всички желаещи да присъстват.\n\nОт секция „Алгебра и логика” на ИМИ – БАН\nHttps://www.math.bas.bg/algebra/seminarAiL/
URL:https://math.bas.bg/event/%d1%81%d1%8a%d0%b2%d0%bc%d0%b5%d1%81%d1%82%d0%bd%d0%be-%d0%b7%d0%b0%d1%81%d0%b5%d0%b4%d0%b0%d0%bd%d0%b8%d0%b5-%d0%bd%d0%b0-%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80%d0%b0-%d0%b0%d0%bb%d0%b3%d0%b5/
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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BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20251015T150000
DTEND;TZID=Europe/Sofia:20251015T170000
DTSTAMP:20260704T000948
CREATED:20251006T195108Z
LAST-MODIFIED:20251006T195108Z
UID:18312-1760540400-1760547600@math.bas.bg
SUMMARY:Семинар по приложна математика
DESCRIPTION:Следващата сбирка на Семинара по приложна математика ще се проведе на 15.10 (сряда) от 15:00 в зала 503 на ИМИ-БАН. \nДоклад на тема \nStochastic scattering control of Walsh’s spider diffusion with optimal diffraction probability measure selected from its own local-time\nще изнесе Исаак Охави\, който работи в обалсти като стохастичен контрол\, стохастична оптимизация и частни диференциални уравнения. \nAbstract: In this talk\, we start by giving a short introduction on “classical” stochastic control theory and its connection with second order nonlinear PDE theory. Then\, we present Walsh’s spider diffusions living on a star-shaped network\, and explain how these processes are at the origin of new problems of stochastic scattering control. A main direction is to focus and understand precisely their behavior and local time at the vertex. Thereafter\, we will give the main ideas\, steps and mathematical directions that I have recently undertaken in order to finally be able to prove existence and weak uniqueness of a spider’s motion having a spinning measure depending on its own local time. \nThe stochastic control problem aims to understand how the spider particle is diffracted at the vertex. The key point is to use the new boundary condition at the junction point\, called: nonlinear local-time Kirchhoff’s boundary condition and the recent advances I have obtained in the analysis of nonlinear partial differential equations in the viscosity framework. \nReferences:  \n–Comparison principle for Walsh’s spider HJB equations with non linear local time Kirchhoff’s boundary transmission. Journal of Mathematical Analysis and Applications\, 547 (2)\, 2025. \n-Martingal problem for a Walsh’s spider diffusion with spinning measure selected from its own local time. Accepted January 2025. Electronic Journal of Probability\, Volume 30\, paper\nno 22\, 2025.\n-Well posedness of linear parabolic partial differential equations posed on a star-shaped network with local time Kirchhoff’s boundary condition at the vertex. Journal of Mathematical Analysis and Applications\, 537 (2)\, 2024. \n-Stochastic scattering control of spider diffusion governed by an optimal probability diffraction measure selected from its own local time. Submitted 2025\, Arxiv arXiv:2501.18057
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%b0-15/
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:20251020T140000
DTEND;TZID=Europe/Sofia:20251020T153000
DTSTAMP:20260704T000948
CREATED:20251015T182437Z
LAST-MODIFIED:20251015T182437Z
UID:18339-1760968800-1760974200@math.bas.bg
SUMMARY:Семинар по особености
DESCRIPTION:Дата и час: 20.10.2025 г.\, 14:00 ч.\nМясто: Зала 578\, ИМИ – БАН \nЗаглавие на доклада: \nThe complete intersection discrepancy of curves\nДокладчик: Andrei Bengus-Lasnier (ИМИ – БАН) \nРезюме: In this talk I will introduce an invariant for reduced curves called the complete intersection discrepancy (cid for short). This numerical quantity arose naturally when trying to generalize known formulas for complete intersection curves to general curves. The cid then serves as a correction term in these formulas. \nI will present some of the cid’s basic properties and derive two formulas. The first relates basic invariants such as Milnor number\, its multiplicity and the multiplicity of its Jacobian ideal\, and generalizes a well-known result in singularity theory due to Lê\, Greuel and Teissier. The second formula is a generalization of the genus-degree formula for projective curves.\n\nThis work is in collaboration with Antoni Rangachev and Terence Gaffney.
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%be%d1%81%d0%be%d0%b1%d0%b5%d0%bd%d0%be%d1%81%d1%82%d0%b8/
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:20251027T140000
DTEND;TZID=Europe/Sofia:20251027T153000
DTSTAMP:20260704T000948
CREATED:20251026T081914Z
LAST-MODIFIED:20251026T081914Z
UID:18392-1761573600-1761579000@math.bas.bg
SUMMARY:Семинар по особености
DESCRIPTION:Следващата сбирка на Семинара по особености ще се състои в понеделник (27.10) от 14:00 часа в зала 578. Д-р Ерик Паeмуру (ИМИ-БАН) ще изнесе доклад на тема \,\, Log canonical thresholds of reduced plane curves”. Абстрактът на неговия доклад е приложен по-долу.\n\nSpeaker:  Erik Paemurru (IMI-BAS)\nTitle: Log canonical thresholds of reduced plane curves\nAbstract: I will give an overview of normal forms of plane curve singularities and define the log canonical threshold. I will then compute log canonical thresholds of all reduced plane curve singularities of degree at most five and all reduced plane curve singularities of degree d and multiplicity d-1. This is based on the works https://arxiv.org/abs/2404.18238 and https://arxiv.org/abs/2508.21676
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%be%d1%81%d0%be%d0%b1%d0%b5%d0%bd%d0%be%d1%81%d1%82%d0%b8-2/
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:20251104T140000
DTEND;TZID=Europe/Sofia:20251104T153000
DTSTAMP:20260704T000948
CREATED:20251028T184134Z
LAST-MODIFIED:20251028T184134Z
UID:18396-1762264800-1762270200@math.bas.bg
SUMMARY:Национален семинар по стохастика
DESCRIPTION:Поредната сбирка на \nНационалния семинар по стохастика\nще се проведе на 4 ноември 2025 г. (вторник) от 14:00 часа в зала 503 на ИМИ – БАН. \nДоклад на тема \nОптимално предсказване на екстремални събития\nще изнесе \nСтилян Стоев (University of Michigan). \nАбстракт \n\n 
URL:https://math.bas.bg/event/%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%b0-44/
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
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BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20251104T150000
DTEND;TZID=Europe/Sofia:20251104T163000
DTSTAMP:20260704T000948
CREATED:20251031T131955Z
LAST-MODIFIED:20251031T132014Z
UID:18427-1762268400-1762273800@math.bas.bg
SUMMARY:Семинар на МЦМН: Atom Theory
DESCRIPTION:Seminar Details\n\n\nSpeaker: Ludmil Katzarkov (ICMS\, IMI-BAS\, University of Miami)\n\n\nTitle: Recent Advancements in the Theory of Atoms\n\n\nDate & Time: Tuesday\, November 4\, 2025\, at 3:00 PM\n\n\nPlace (In-Person): Room 403\, IMI-BAS\n\n\nOnline Attendance (Zoom)\n\n\nZoom Link: https://us02web.zoom.us/j/86497450517?pwd=39OtfySJ4SbhKihr1IpaIz32dD7iBp.1\n\n\nMeeting ID: 864 9745 0517\n\n\nPasscode: 181023\n\n\nFor further information\, always keep track of our website:  https://icms.bg/research-groups/theory-of-atoms/
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-atom-theory/
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:20251105T140000
DTEND;TZID=Europe/Sofia:20251105T153000
DTSTAMP:20260704T000948
CREATED:20251031T115558Z
LAST-MODIFIED:20251031T122424Z
UID:18416-1762351200-1762356600@math.bas.bg
SUMMARY:Семинар по геометрия на МЦМН
DESCRIPTION:Следващата сбирка на Семинара по геометрия на МЦМН ще се състои в сряда\, 5 ноември\, от 14:00 ч. в зала 403 и онлайн в Zoom. \nДоклад на тема \nSpecial Linear Systems on Real Algebraic Curves\nще изнесе Turgay Akyar (ИМИ – БАН). \nДопълнителна информация можете да откриете на:\nhttps://icms.bg/special-linear-systems-on-real-algebraic-curves-geometry-seminar-talk-by-turgay-akyar/ \nZoom link:\n\nhttps://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1
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-17/
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:20251111T140000
DTEND;TZID=Europe/Sofia:20251111T153000
DTSTAMP:20260704T000948
CREATED:20251106T173729Z
LAST-MODIFIED:20251106T173729Z
UID:18448-1762869600-1762875000@math.bas.bg
SUMMARY:Семинар по приложна математика
DESCRIPTION:Следващата сбирка на Семинара по приложна математика ще бъде на 11.11. (вторник) от 14:00 в ИМИ-БАН\, Зала 503. \nДокладчик: Хелмут Питърс (Манхайм\, Германия) \nЗаглавие: The number of cycles in a random permutation and the number of segregating sites jointly converge to the Brownian sheet \nРезюме: Consider a random permutation of {1\, …\, ⌊nᵗ²⌋} drawn according to the Ewens measure with parameter t₁\, and let K(n\, t) denote the number of its cycles\, where t ≡ (t₁\, t₂) ∈ [0\, 1]². Next\, consider a sample drawn from a large\, neutral population of haploid individuals subject to mutation under the infinitely many sites model of Kimura\, whose genealogy is governed by Kingman’s coalescent. Let S(n\, t) count the number of segregating sites in a sample of size ⌊nᵗ²⌋ when mutations arrive at rate t₁/2. Our main result comprises two different couplings of the above models for all parameters n ≥ 2 and t ∈ [0\, 1]²\, such that in both couplings one has weak convergence of processes as n → ∞ to a one-dimensional Brownian sheet. This generalizes and unifies a number of well-known results. \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%b0-16/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
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