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BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20241127T160000
DTEND;TZID=Europe/Sofia:20241127T173000
DTSTAMP:20260405T054558
CREATED:20241122T093719Z
LAST-MODIFIED:20241122T093719Z
UID:16962-1732723200-1732728600@math.bas.bg
SUMMARY:Семинар по геометрия на МЦМН
DESCRIPTION:Следващата сбирка на Семинара по геометрия на МЦМН\nще се проведе в сряда\, 27 ноември 2024 г. от 16:00 ч. в зала 403 и онлайн в Zoom: \nДоклад на тема \nTropical compactifications of moduli spaces\n\nще изнесе Лайънъл Ланг\, Международен център по математически науки (МЦМН – София). \n\n\n\nAbstract: In this talk I will describe various tropical compactifications of the moduli spaces of curves. I will discuss some motivations and applications coming from tropical geometry (joint with M. Melo\, J. Rau and F. Viviani). \n\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-14/
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:20241204T160000
DTEND;TZID=Europe/Sofia:20241204T173000
DTSTAMP:20260405T054558
CREATED:20241204T154928Z
LAST-MODIFIED:20241204T155031Z
UID:17057-1733328000-1733333400@math.bas.bg
SUMMARY:Семинар по геометрия на МЦМН
DESCRIPTION:Следващата сбирка на Семинара по геометрия на МЦМН\nще се проведе в сряда\, 4 ДЕКЕМВРИ 2024 г. от 16:00 ч. в зала 403 и онлайн в Zoom: \nДоклад на тема \nTropical compactifications of moduli spaces – Part 2\n\nще изнесе Лайънъл Ланг\, Международен център по математически науки (МЦМН – София). \n\n\n\nAbstract: In this talk I will describe various tropical compactifications of the moduli spaces of curves. I will discuss some motivations and applications coming from tropical geometry (joint with M. Melo\, J. Rau and F. Viviani). \n\n\nZoom link:\nhttps://us02web.zoom.us/j/83740034721?pwd=VnBtcVpGUktscHQ4a09jZkNZTURyZz09
URL:https://math.bas.bg/event/copy-%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-2/
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:20241209T130000
DTEND;TZID=Europe/Sofia:20241209T160000
DTSTAMP:20260405T054558
CREATED:20241209T102947Z
LAST-MODIFIED:20241209T102947Z
UID:17068-1733749200-1733760000@math.bas.bg
SUMMARY:Годишна отчетна сесия на изследователите към МЦМН
DESCRIPTION:На 9 декември 2024 г. (понеделник)\nот 13:00 часа в зала 403 на ИМИ-БАН\nще се проведе отчетна сесия на изследователите към МЦМН.\nПРОГРАМА
URL:https://math.bas.bg/event/%d0%b3%d0%be%d0%b4%d0%b8%d1%88%d0%bd%d0%b0-%d0%be%d1%82%d1%87%d0%b5%d1%82%d0%bd%d0%b0-%d1%81%d0%b5%d1%81%d0%b8%d1%8f-%d0%bd%d0%b0-%d0%b8%d0%b7%d1%81%d0%bb%d0%b5%d0%b4%d0%be%d0%b2%d0%b0%d1%82%d0%b5/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Работен семинар
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20250114T140000
DTEND;TZID=Europe/Sofia:20250114T153000
DTSTAMP:20260405T054558
CREATED:20250113T165353Z
LAST-MODIFIED:20250113T165353Z
UID:17234-1736863200-1736868600@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Дата: 14.01.2025 г.\, 14:00 ч. \nМясто: Зала 403\, ИМИ – БАН \nДокладчик: Jean-Pierre Gazeau от Université Paris-Cité \nДоклад: Regularized Quantum Motion in a Bounded Set: Hilbertian Aspects \nДопълнителна информация: https://icms.bg/regularized-quantum-motion-in-a-bounded-set-hilbertian-aspects-talk-by-jean-pierre-gazeau/ \nРезюме. It is well known that the momentum operator canonically conjugated to the position operator for a particle confined within a bounded interval of the line (with Dirichlet boundary conditions) is not essentially self-adjoint\, as it possesses a continuum of self-adjoint extensions. In this talk\, we demonstrate that essential self-adjointness can be restored by symmetrically weighting the momentum operator with a positive bounded function that approximates the indicator function of the given interval. This weighted momentum operator arises naturally from a similarly weighted classical momentum through the Weyl-Heisenberg covariant integral quantization of functions or distributions. \nReference:\nF. Bagarello\, J.-P. Gazeau\, C. Trapani\, J. Math. Anal. Appl. 540 (2024) 128631
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-25/
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:20250204T140000
DTEND;TZID=Europe/Sofia:20250204T153000
DTSTAMP:20260405T054558
CREATED:20250130T174422Z
LAST-MODIFIED:20250130T174422Z
UID:17270-1738677600-1738683000@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Дата: 04.02.2025 г.\, 14:00 ч. \nМясто: Зала 403\, ИМИ – БАН \nДокладчик: Мирослав Георгиев\, Институт по математика и информатика\, Българска академия на науките \nДоклад: Yukawa regulators in electrodynamics: Exact approach to the self-energy and anomalous g-factor \nДопълнителна информация: https://icms.bg/yukawa-regulators-in-electrodynamics-exact-approach-to-the-self-energy-and-anomalous-g-factor-icms-seminar-talk-by-miroslav-georgiev/ \nРезюме.  In the present talk\, we will discuss the prospect of electrodynamics in quantifying the self-interaction of a non-composite charged particle. We will demonstrate that under the consideration of unique to the particle Yukawa cut-offs the radial singularity in corresponding electromagnetic field potentials’ is removed allowing the classical theory to admit exact solutions for the particle’s self-energy and anomalous g-factor. Highly accurate results for the electron’s and muon’s anomalous g-factor will be presented\, with calculated values matching the most recent measurements reported in the literature to 0.59 ppt and 60 ppt\, respectively.
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-26/
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:20250211T140000
DTEND;TZID=Europe/Sofia:20250211T153000
DTSTAMP:20260405T054558
CREATED:20250130T175635Z
LAST-MODIFIED:20250130T175930Z
UID:17274-1739282400-1739287800@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Дата: 11.02.2025 г.\, 14:00 ч. \nМясто: Зала 403\, ИМИ – БАН \nДокладчик: Sergey Favorov\, Department of Pure Mathematics\, Kharkov National University\, Ukraine \nДоклад: Fourier quasicrystals and their generalizations\, zeros of Dirichlet series\, other almost periodic objects \nДопълнителна информация: https://icms.bg/fourier-quasicrystals-and-their-generalizations-zeros-of-dirichlet-series-other-almost-periodic-objects-icms-seminar-talk-by-sergey-favorov/ \nРезюме. A complex measure \(\mu\) on a \(d\)-dimensional Euclidean space is a crystalline measure (CM) if it is the temperate distribution\, its distributional Fourier transform \(\hat\mu\) is also a measure\, and supports of \(\mu\) and \(\hat\mu\) are discrete (locally finite); \(\mu\) is a Fourier quasicrystal (FQ) if\, in addition\, \(|\mu|\) and \(|\hat\mu|\) are also temperate distributions. For example\, if \(\mu_0\) is the sum of the unit masses at all points with integer coordinates\, then by Poisson’s formula \(\hat\mu_0=\mu_0\). Hence\, \(\mu_0\) is FQ. \nWe show a theorem of Lev-Olevskii on a sufficient condition for trivialization of FQ. Then we discuss a simple condition for CM to be FQ and present CM that is not FQ. \nWe recall the notion of an almost periodic function\, introduce the notions of almost periodic measures\, distributions\, sets\, and show their connections with CM. In paricular\, we get various uniqueness theorems for FQ. \nFinally\, we show the description of FQ with unit masses as zeros of exponential polynomials due to Olevskii and Ulanovskii\, and discuss some generalizations to zeros of Dirichlet series and to measures in a horizontal strip of finite width.
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-27/
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:20250325T140000
DTEND;TZID=Europe/Sofia:20250325T153000
DTSTAMP:20260405T054558
CREATED:20250319T152833Z
LAST-MODIFIED:20250319T152833Z
UID:17502-1742911200-1742916600@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Дата: 25.03.2025 г.\, 14:00 ч. \nМясто: Зала 403\, ИМИ – БАН \nДокладчик: Михаил Школников\, ИМИ – БАН \nДоклад: Affine distance function \nДопълнителна информация: https://icms.bg/category/icms-seminar/ \nРезюме. Affine geometry is sometimes described as “what remains of Euclidean geometry when distances are forgotten”. In this talk\, I will report on a very recent discovery of an affine-invariant notion\, which may be viewed as a distance from a point inside a convex domain to its boundary. This new concept stems from a suggestion of Conan Leung\, who proposed to average the canonical tropical series\, a fundamental notion of tropical optics\, over the manifold of all tropical structures of fixed covolume on the given affine space. Very little of what we (Nikita Kalinin\, Ernesto Lupercio and me) currently know\, as well as necessary preliminaries\, some observations and precise conjectures\, will be covered during the talk\, which mainly serves as an invitation to participate in developing this exciting new topic.
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-28/
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:20250327T160000
DTEND;TZID=Europe/Sofia:20250327T173000
DTSTAMP:20260405T054558
CREATED:20250325T192815Z
LAST-MODIFIED:20250326T082005Z
UID:17506-1743091200-1743096600@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Дата: 27.03.2025 г.\, 16:00 ч. \nМясто: Зала 403\, ИМИ – БАН \nДокладчик: Luis Ugarte\, University of Zaragoza\, Spain \nДоклад: Complex structures on Lie algebras and its application to the Hull-Strominger system \nДопълнителна информация: https://icms.bg/category/icms-seminar/ \nРезюме. In this talk we will explain the role that the Lie algebras play in the construction of 6-dimensional compact quotient spaces M=G/Γ\, where Γ is a lattice\, endowed with an invariant complex structure with holomorphically trivial canonical bundle.We will use the approach of stable forms in six dimensions to provide a classification of unimodular Lie algebras admitting a complex structure with non-zero closed (3\,0)-form. Some of these spaces can be equipped with balanced Hermitian metrics and they provide invariant solutions of the Hull-Strominger system\, even with non-flat connection on the tangent bundle satisfying the Hermitian-Yang-Mills condition.
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-29/
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:20250411T160000
DTEND;TZID=Europe/Sofia:20250411T173000
DTSTAMP:20260405T054558
CREATED:20250410T165453Z
LAST-MODIFIED:20250410T165453Z
UID:17619-1744387200-1744392600@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Дата: 11.04.2025 г.\, 16:00 ч. \nМясто: Зала 403\, ИМИ – БАН \nДокладчик: Felipe Espreafico Guelerman\, Sorbonne Université – Paris \nДоклад: On Motivic and Arithmetic Donaldson-Thomas invariants \nДопълнителна информация: https://icms.bg/category/icms-seminar/ \nРезюме. Aiming to understand the relation to other “refined invariants”\, and especially their possible interpretation in quantum theory\, we explain how to obtain a quadratic\, A1-version of Donaldson-Thomas invariants from the motivic refinements first introduced in Kontsevich-Soibelman. Following ideas from Behrend\, Bryan and Szendroi\, we provide predictions for these invariants in a few simple examples\, mainly the computation of DT invariants of A3. Our main goal is to draw relationships with the literature\, including works of Levine\, Denef and Loser\, Azouri\, Pepin-Lehaulleur\, Srinivas among others. We begin with a brief introduction to A1-enumerative geometry and in the end\, we pose some further questions on possible extensions of our definitions. This is joint work with Johannes Walcher. We also comment on joint work in progress with Ran Azouri.
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-30/
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:20250429T140000
DTEND;TZID=Europe/Sofia:20250429T153000
DTSTAMP:20260405T054558
CREATED:20250424T212823Z
LAST-MODIFIED:20250427T075255Z
UID:17670-1745935200-1745940600@math.bas.bg
SUMMARY:Съвместна сбирка на семинара на МЦМН и семинара "Алгебра и Логика"
DESCRIPTION:Съвместна сбирка на семинара на МЦМН и семинара “Алгебра и Логика” в ИМИ\, София\, ще се проведе идния вторник\, с доклад на Георги Томанов\, както следва.\n\nВторник\, 29-ти април\, 14:00 часа\, зала 403 на ИМИ-БАН.\nГеорги Томанов\, Université Claude Bernard\, Lyon 1.\nGroup action on homogeneous spaces and applications in number theory\n\nAbstract: Many longstanding conjectures and problems in number theory can be reformulated in terms of group actions on homogeneous spaces. This reformulation allows them to be tackled using\, alongside deep methods from algebra and algebraic geometry\, powerful tools from ergodic theory and dynamical systems. An example of the effectiveness of this approach is Margulis’s groundbreaking proof of the Oppenheim conjecture (formulated in 1929) concerning the values of quadratic forms at integer points. \nIn this talk\, aimed at a general audience\, we will describe recent results on the characterization of norm forms—a classical object in algebraic number theory—in terms of their values at integer points. These results answer natural questions and are related to still-open conjectures of Littlewood (from 1930) and of Cassels and Swinnerton-Dyer (from 1955). The proofs rely on studying the actions of maximal tori of algebraic groups on homogeneous spaces of arithmetic origin. \n\nПовече информация можете да намерите на страницата на семинара:\nhttps://icms.bg/category/icms-seminar/
URL:https://math.bas.bg/event/%d1%81%d1%8a%d0%b2%d0%bc%d0%b5%d1%81%d1%82%d0%bd%d0%b0-%d1%81%d0%b1%d0%b8%d1%80%d0%ba%d0%b0-%d0%bd%d0%b0-%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80%d0%b0-%d0%bd%d0%b0-%d0%bc%d1%86%d0%bc%d0%bd-%d0%b8/
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:20250430T160000
DTEND;TZID=Europe/Sofia:20250430T173000
DTSTAMP:20260405T054558
CREATED:20250424T092412Z
LAST-MODIFIED:20250424T093036Z
UID:17661-1746028800-1746034200@math.bas.bg
SUMMARY:Семинар по геометрия на МЦМН
DESCRIPTION:Следващата сбирка на Семинара по геометрия на МЦМН\nще се проведе в сряда\, 30 април 2025 г. от 16:00 ч. в зала 403 и онлайн в Zoom: \nДоклад на тема \nBinary Quadratic Forms and Conway’s Topographs (Lecture 1 of 3)\n\nще изнесе Nikita Kalinin\, Guangdong Technion Israel Institute of Technology. \n\nСледващите две лекции ще бъдат на 07.05.2025 и 14.05.2025 от 16:00 ч.\n\nAbstract: Binary quadratic forms are as elementary as they are mysterious—much like prime numbers. In 1997\, John Conway introduced topographs\, a powerful geometric tool that provides a geometric visualization of binary quadratic forms and their values. These lectures will explore how topographs\, combined with telescoping summation techniques\, yield elegant formulas — some with intuitive geometric interpretations. For instance\, consider the following result: \nLet \n\(A = \big\{ (x\, y) \mid  x\,y\in \mathbb{Z}_{\geq 0}^2\, \det(x \ \ y) = 1 \big\}\,\) \nthe set of pairs of lattice vectors in the first quadrant spanning a parallelogram of oriented area 1. Then\, \n\(4 \displaystyle\sum_{(x\,y) \in A} \frac{1}{|x|^2 \cdot |y|^2 \cdot |x+y|^2} = \pi.\) \nLecture Outline \n1. Introduction to Binary Quadratic Forms and Conway’s Topographs\nWe will begin with the basics of binary quadratic forms and their classification\, followed by an introduction to Conway’s topographs—a visual and geometric framework for understanding them. \n2. Class Number Formula and Summation over Topographs\nBuilding on the first lecture\, we will explore the class number formula and how summation identities arise naturally from the structure of topographs. \n3. Evaluation of Lattice Sums via Telescoping over Topographs\nThe final lecture will focus on telescoping techniques\, demonstrating how they can be used to evaluate intricate lattice sums—such as the one above—with geometric meaning. \n\n\nZoom link:\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-15/
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:20250507T160000
DTEND;TZID=Europe/Sofia:20250507T173000
DTSTAMP:20260405T054558
CREATED:20250505T165639Z
LAST-MODIFIED:20250505T170018Z
UID:17708-1746633600-1746639000@math.bas.bg
SUMMARY:Семинар по геометрия на МЦМН
DESCRIPTION:Следващата сбирка на Семинара по геометрия на МЦМН\nще се проведе в сряда\, 7 май 2025 г. от 16:00 ч. в зала 403 и онлайн в Zoom: \nДоклад на тема \nBinary Quadratic Forms and Conway’s Topographs (Lecture 2 of 3)\n\nще изнесе Nikita Kalinin\, Guangdong Technion Israel Institute of Technology. \n\nСледващата лекция ще бъде на 14.05.2025 от 16:00 ч.\n\nAbstract: Binary quadratic forms are as elementary as they are mysterious—much like prime numbers. In 1997\, John Conway introduced topographs\, a powerful geometric tool that provides a geometric visualization of binary quadratic forms and their values. These lectures will explore how topographs\, combined with telescoping summation techniques\, yield elegant formulas — some with intuitive geometric interpretations. For instance\, consider the following result: \nLet \n\(A = \big\{ (x\, y) \mid  x\,y\in \mathbb{Z}_{\geq 0}^2\, \det(x \ \ y) = 1 \big\}\,\) \nthe set of pairs of lattice vectors in the first quadrant spanning a parallelogram of oriented area 1. Then\, \n\(4 \displaystyle\sum_{(x\,y) \in A} \frac{1}{|x|^2 \cdot |y|^2 \cdot |x+y|^2} = \pi.\) \nLecture Outline \n1. Introduction to Binary Quadratic Forms and Conway’s Topographs\nWe will begin with the basics of binary quadratic forms and their classification\, followed by an introduction to Conway’s topographs—a visual and geometric framework for understanding them. \n2. Class Number Formula and Summation over Topographs\nBuilding on the first lecture\, we will explore the class number formula and how summation identities arise naturally from the structure of topographs. \n3. Evaluation of Lattice Sums via Telescoping over Topographs\nThe final lecture will focus on telescoping techniques\, demonstrating how they can be used to evaluate intricate lattice sums—such as the one above—with geometric meaning. \n\n\nZoom link:\nhttps://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1\n\nВидеозапис и презентация на първата лекция:\n\nhttps://youtu.be/z7Pz33JyCuA?si=rQ2L4yXJHMdiDkpe\nhttps://kilin-math.github.io/assets/numbers/telescopic_presentation1.pdf
URL:https://math.bas.bg/event/copy-%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-3/
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:20250513T140000
DTEND;TZID=Europe/Sofia:20250513T151500
DTSTAMP:20260405T054558
CREATED:20250512T114627Z
LAST-MODIFIED:20250512T115322Z
UID:17734-1747144800-1747149300@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Сбирка на семинара на МЦМН ще се проведе на 13.05.2025 г. (вторник) от 14:00 ч. в зала 403 на ИМИ – БАН. \nДокладчик: Milan Zlatanovic (University of Niš) \nДоклад: Non-symmetric gravitational theorys \nРезюме: We will consider a connection with totally skew-symmetric torsion on non-symmetric (semi-) Riemann manifolds that satisfy Einstein’s metric condition (EMC). We proved that an almost Hermitian manifold is a non-symmetric Riemann manifold that satisfies EMC if and only if it is a Nearly Kahler manifold. We will also show what happens in the case of para Hermitian manifold\, contact\, and para-contact manifolds that satisfy EMC. We show that a connection with skew symmetric torsion satisfying EMC exists on an almost contact metric manifolds when it is D-homothetic to a cosymplectic manifold. We proved the structure theorem for the new class of almost contact metric manifold and special attention we have focused on dimension 5. As a natural continuation of this research\, we dealt with the case of Lorentzian manifolds. \nThis is joint work with Stefan Ivanov and Nikola Stanchev.\nДопълнителна информация: https://icms.bg/category/icms-seminar/ \n 
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-31/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20250608
DTEND;VALUE=DATE:20250614
DTSTAMP:20260405T054558
CREATED:20250519T062845Z
LAST-MODIFIED:20250519T062845Z
UID:17752-1749340800-1749859199@math.bas.bg
SUMMARY:Международна конференция ``Singularities in Plovdiv"
DESCRIPTION:От 8 до 13 юни 2025 г.  \nв Пловдив ще се проведе  \nмеждународна конференция “Singularities in Plovdiv”\,\nна която ще изнесат доклади водещи специалисти в теория на особеностите на теми свързани с нискоразмерна топология\, теория на нормиранията\, разрешаване на особености\, теория на деформациите\, динамични системи и др. \nКонференцията се организира от Международния център по математически науки – София с подкрепата на Програма ПИКОМ\, Фондация Саймънс\, Швейцарска национална научна фондация\, Математическия институт \,\,Жусийо” – Париж. \nПовече за конференцията можете да научите тук:\nhttps://icms.bg/singularities-in-plovdiv-2025/
URL:https://math.bas.bg/event/%d0%bc%d0%b5%d0%b6%d0%b4%d1%83%d0%bd%d0%b0%d1%80%d0%be%d0%b4%d0%bd%d0%b0-%d0%ba%d0%be%d0%bd%d1%84%d0%b5%d1%80%d0%b5%d0%bd%d1%86%d0%b8%d1%8f-singularities-in-plovdiv/
LOCATION:Пловдив
CATEGORIES:Конференция
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20250715T130000
DTEND;TZID=Europe/Sofia:20250715T143000
DTSTAMP:20260405T054558
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:20260405T054558
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;VALUE=DATE:20250811
DTEND;VALUE=DATE:20250815
DTSTAMP:20260405T054558
CREATED:20250805T142926Z
LAST-MODIFIED:20250805T142926Z
UID:18104-1754870400-1755215999@math.bas.bg
SUMMARY:МЦМН - Международна конференция Geometry at Large
DESCRIPTION:Международния център за математически науки (ICMS-София) към Института по математика и информатика на Българската академия на науките и\nИнститута за математически науки на Северна и Южна Америка (IMSA) към Университета в Маями \nорганизират \nМеждународна конференция \nGeometry at Large\,\nкоято ще се проведе в Бургас от 11 до 14 август 2025. \nПрограма на конференцията.
URL:https://math.bas.bg/event/%d0%bc%d1%86%d0%bc%d0%bd-%d0%bc%d0%b5%d0%b6%d0%b4%d1%83%d0%bd%d0%b0%d1%80%d0%be%d0%b4%d0%bd%d0%b0-%d0%ba%d0%be%d0%bd%d1%84%d0%b5%d1%80%d0%b5%d0%bd%d1%86%d0%b8%d1%8f-geometry-at-large/
LOCATION:Grand Hotel & SPA Primoretz\, Burgas\, Burgas\, Bulgaria
CATEGORIES:Конференция
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20250923T140000
DTEND;TZID=Europe/Sofia:20250923T170000
DTSTAMP:20260405T054558
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:20260405T054558
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:20260405T054558
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:20251104T150000
DTEND;TZID=Europe/Sofia:20251104T163000
DTSTAMP:20260405T054558
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
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20251205
DTEND;VALUE=DATE:20251213
DTSTAMP:20260405T054558
CREATED:20251210T101728Z
LAST-MODIFIED:20251210T102149Z
UID:18688-1764892800-1765583999@math.bas.bg
SUMMARY:Международна конференция Recent Developments in Modern Hodge Theory
DESCRIPTION:Международна конференция Recent Developments in Modern Hodge Theory \n5 – 12 декември 2025 г.\, зала 403 \n\n\n\n\n\nКонференцията ще разгледа някои нови резултати в съвременната теория на Ходж и свързани с нея теми. \nКонференцията е организирана от Международния център за математически науки към ИМИ – БАН\, IMSA Miami и е подкрепена от фондация Simons. \nПрограма и допълнителна информация можете да откриете на сайта на конференцията:\nhttps://icms.bg/workshop-recent-developments-in-modern-hodge-theory/ \nНа 10 и 11 декември сесиите ще се проведат в Зала 256 (Заседателна зала на ИМИ – БАН).
URL:https://math.bas.bg/event/%d0%bc%d0%b5%d0%b6%d0%b4%d1%83%d0%bd%d0%b0%d1%80%d0%be%d0%b4%d0%bd%d0%b0-%d0%ba%d0%be%d0%bd%d1%84%d0%b5%d1%80%d0%b5%d0%bd%d1%86%d0%b8%d1%8f-recent-developments-in-modern-hodge-theory/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Конференция
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BEGIN:VEVENT
DTSTART;VALUE=DATE:20251215
DTEND;VALUE=DATE:20251220
DTSTAMP:20260405T054558
CREATED:20251210T102758Z
LAST-MODIFIED:20251210T102758Z
UID:18693-1765756800-1766188799@math.bas.bg
SUMMARY:Международна конференция Quantum Groups and Cluster Algebras
DESCRIPTION:Международният център за математически науки – София организира международна конференция на тема \nQuantum Groups and Cluster Algebras \nв периода 15 – 19 декември 2025 г. в Института по математика и информатика към Българската академия на науките. \nЦелта на конференцията е да даде възможност на изследователите да споделят своите последни постижения\, да насърчи по-нататъшното развитие в теорията на квантовите групи и клъстерните алгебри и да изследва техните взаимодействия и приложения в математиката и физиката. \nПрограма и допълнителна информация ще откриете на сайта на конференцията:\nhttps://icms.bg/international-conference-quantum-groups-and-cluster-algebras-2025/
URL:https://math.bas.bg/event/%d0%bc%d0%b5%d0%b6%d0%b4%d1%83%d0%bd%d0%b0%d1%80%d0%be%d0%b4%d0%bd%d0%b0-%d0%ba%d0%be%d0%bd%d1%84%d0%b5%d1%80%d0%b5%d0%bd%d1%86%d0%b8%d1%8f-quantum-groups-and-cluster-algebras/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Конференция
END:VEVENT
END:VCALENDAR