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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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DTSTART:20250330T010000
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DTSTART;TZID=Europe/Sofia:20251104T130000
DTEND;TZID=Europe/Sofia:20251104T143000
DTSTAMP:20260429T002032
CREATED:20251031T130526Z
LAST-MODIFIED:20251031T131026Z
UID:18421-1762261200-1762266600@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Семинар на МЦМН \nВторник\, 4.11.2025\, 13:00 ч.\, Зала 403\, ИМИ – БАН \nЛектор: Leonardo Cavenaghi (МЦМН\, ИМИ – БАН) \nТема на доклада: Exotic phenomena in topology and geometry \n  \nРезюме: This talk\, aimed at a general audience of mathematicians\, discusses very geometric models of exotic spheres. \nExotic spheres are manifolds homeomorphic to classical spheres but not diffeomorphic to them. We will outline some constructions via group actions and discuss their admissible geometries. For instance\, until this day\, it is not known whether an exotic sphere admits a metric of positive sectional curvature\, but some do not even admit positive scalar curvature. \nIn this talk\, we also outline how one can indirectly study their geometries\, aiming to gain a better understanding of their admissible geometries\, for example\, regarding the existence of Lorentzian metrics and the spectral problem. \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-38/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
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DTSTART;TZID=Europe/Sofia:20251118T130000
DTEND;TZID=Europe/Sofia:20251118T153000
DTSTAMP:20260429T002032
CREATED:20251118T095857Z
LAST-MODIFIED:20251118T095857Z
UID:18584-1763470800-1763479800@math.bas.bg
SUMMARY:Съвместно заседание на Семинара по особености и Семинара на МЦМН
DESCRIPTION:Joint meeting of the Seminar on Singularities and the ICMS Seminar\, with a lecture by Pablo Cuadrado. The program is as follows.\n\nTuesday\, November 18\, room 403\, IMI-BAS.\n\n13:00 — Giovane Galindo (ICMS\, IMI-BAS)\nBundle-type sub-Riemannian structures on holonomy bundles\n\n14:00 — Pablo Portilla Cuadrado (Universidad Politécnica de Madrid)\nThe medial axis of the Milnor fiber\n\nAbstract (Galindo): In this talk we present the notion of Gromov-Hausdorff distance\, a novel field of study that aims to understand the topology of the moduli space of Riemannian metrics on a given manifold. We will then present new results on the subject concerning the collapse of principal bundles onto reductive homogeneous spaces.\n\nAbstract (Cuadrado): Let f(x\,y) define an isolated singularity at the origin. In this talk we explore a new flat metric induced on the Milnor fiber of f by the associated complex Hamiltonian vector field. With the help of this metric we can define a spine on each Milnor fiber via the classical method of the medial axis. This spine depends on the choice of boundary for the Milnor fiber. It is subanalytic and comes equipped with a retraction from the boundary onto it. We hope to understand the geometry of the versal unfolding space via these spines. This ongoing joint work with Norbert A’Campo.
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%bf%d0%be-%d0%be%d1%81/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
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BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20251125T130000
DTEND;TZID=Europe/Sofia:20251125T143000
DTSTAMP:20260429T002032
CREATED:20251121T194854Z
LAST-MODIFIED:20251121T195038Z
UID:18595-1764075600-1764081000@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Вторник\, 25 ноември 2025 г.\, 13:00\, room 403\, IMI-BAS.\n\nDeepanshu Prasad (МЦМН\, ИМИ – БАН)\nAn Extension of Sato-Kimura Theorem for Semi-invariant rings\n\nРезюме: We give an analog of a result of Sato-Kimura in the context of a semi-invariant  ring for a finite dimensional algebra over an algebraically closed field K of characteristics 0. Then\, we examine the case of finite dimensional hereditary algebras over K. This is joint work with Charles Paquette and David Wehlau. \n\nAn Extension of Sato-Kimura Theorem for Semi-invariant rings\, ICMS seminar talk by Deepanshu Prasad
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-39/
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:20251126T160000
DTEND;TZID=Europe/Sofia:20251126T173000
DTSTAMP:20260429T002032
CREATED:20251121T195900Z
LAST-MODIFIED:20251126T094131Z
UID:18602-1764172800-1764178200@math.bas.bg
SUMMARY:Съвместно заседание на семинара на МЦМН и семинара на секция МОИ
DESCRIPTION:26 ноември 2025 г.\, сряда\, от 16:00 ч. в Зала 403 на ИМИ – БАН. \nСъвместно заседание на Семинара на МЦМН и Семинара на секция Математически основи на информатиката \nFrank Vallentin (Universität zu Köln) \nLeast distortion Euclidean embeddings of flat tori\nРезюме: In the emerging field of bi-Lipschitz invariant theory\, one studies embeddings of orbit spaces H/G (H a Hilbert space\, G a subgroup of its automorphisms) into simpler Hilbert spaces via distance-preserving maps up to a constant factor. \n\nIn this talk\, I present an infinite-dimensional semidefinite program that computes least-distortion embeddings of flat tori Rn/L\, where L is an n-dimensional lattice\, into Hilbert spaces. Using symmetry reduction techniques\, this infinite-dimensional semidefinite program reduces to an infinite-dimensional linear program. \nEven with this simplification\, solving the program remains challenging. By combining this approach with the linear programming bound for spherical designs\, combined with brute-force methods\, we finally are able to determine the least-distortion embeddings of Rn/Zn\, R2/A2\, and R8/E8. \n(Based on joint work with Arne Heimendahl\, Moritz Lücke\, Philippe Moustrou\, and Marc Christian Zimmermann) \n\nLeast distortion Euclidean embeddings of flat tori\, ICMS seminar talk by Frank Vallentin
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%bd%d0%b0-%d0%bc%d1%86/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
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