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BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20250513T151500
DTEND;TZID=Europe/Sofia:20250513T163000
DTSTAMP:20260612T182641
CREATED:20250507T203646Z
LAST-MODIFIED:20250512T114647Z
UID:17728-1747149300-1747153800@math.bas.bg
SUMMARY:Встъпителна лекция на доц. Михаил Школников
DESCRIPTION:Встъпителната лекция на доцент Михаил Школников в секция Анализ\, геометрия и топология на ИМИ-БАН ще се проведе на 13.05.2025 г. (вторник) от 15:15 ч. в зала 403 на ИМИ – БАН. \nДокладчик: Михаил Школников (ИМИ – БАН) \nДоклад: Introduction to amoebas and tropicalization \nРезюме: We will start by reviewing the most classical aspects of the theory of amoebas deeply rooted in complex analysis and geometry. Next\, we will pass to the notion of a tropical limit of amoebas\, and will see how restoring the phase allows to recover topology and deduce intersection-theoretic results. After that\, we will discuss some results (and their limitations) obtained with Grigory Mikhalkin in the context of non-commutative versions of amoebas of surfaces and tropical limits of curves inside the special matrix group SL(2\,C). I will conclude by sketching a proof of the complete description of possible tropicalizations of families of analytic surfaces in SL(2\,C) recently obtained with Peter Petrov\, in particular\, motivating our ongoing project on the non-commutative phase tropicalization\, a few words about which will be said if time permits. \n  \n 
URL:https://math.bas.bg/event/%d0%b2%d1%81%d1%82%d1%8a%d0%bf%d0%b8%d1%82%d0%b5%d0%bb%d0%bd%d0%b0-%d0%bb%d0%b5%d0%ba%d1%86%d0%b8%d1%8f-%d0%bd%d0%b0-%d0%b4%d0%be%d1%86-%d1%88%d0%ba%d0%be%d0%bb%d0%bd%d0%b8%d0%ba%d0%be%d0%b2-%d0%b8/
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:20250715T130000
DTEND;TZID=Europe/Sofia:20250715T143000
DTSTAMP:20260612T182641
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:20260612T182641
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:20260612T182641
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:20250729T130000
DTEND;TZID=Europe/Sofia:20250729T143000
DTSTAMP:20260612T182641
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:20251202T130000
DTEND;TZID=Europe/Sofia:20251202T160000
DTSTAMP:20260612T182641
CREATED:20251202T105711Z
LAST-MODIFIED:20251202T105711Z
UID:18623-1764680400-1764691200@math.bas.bg
SUMMARY:Семинар на МЦМН и съвместно заседание със семинара АГТ
DESCRIPTION:Следващото заседание на семинара на МЦМН ще се състои във вторник\, 2 декември 2025 г. Доклади ще изнесат Рой Маген от МЦМН и Ливиу Орнеа от Букурещския университет\, като вторият доклад е в рамките на съвместно заседание със семинара на секция “Анализ\, Геометрия и Топология”. Програмата е следната.\n\nICMS Seminar and AGT Seminar\n\nTuesday\, December 2nd\, room 403 IMI-BAS. \n\n\n13:00 — Roy Magen (ICMS\, IMI-BAS) \n\n Flavours of homotopy theory \n\n\n14:00 — Liviu Ornea (University of Bucarest) \n\n Distinguished non-Kähler metrics on compact complex manifolds \n\nAbstract (Magen): \n   In this talk we will consider different flavours of homotopy theory for different types of geometric contexts. First we will recall the usual definitions of the homotopy category\, and equivariant homotopy categories\, and we will show how we can think of these in terms of (equivariant) smooth manifolds. This will give us a suitable framework with which to adapt the notion of homotopy theory to different geometries.\nWe first use this framework to give a brief overview of the story in algebraic geometry\, which produces motivic homotopy theory. Next\, we will use our framework to discuss notions of homotopy theories parametrized by a geometric object\, and discuss some consequences.\nDepending on time constraints and interest\, we will end either by discussing work relating this homotopical framework to 6-functor formalisms\, by going over a version of this story in the complex analytic setting\, or by introducing C∞-schemes and discussing possibilities for an extension of the story for manifolds to this setting. \nAbstract (Ornea):\n\n   I shall review the definitions of LCK\, pluriclosed and balanced metrics and discuss their incompatibility on the same compact complex manifold.
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-%d0%b8-%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/
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:20260602T130000
DTEND;TZID=Europe/Sofia:20260602T143000
DTSTAMP:20260612T182641
CREATED:20260527T072127Z
LAST-MODIFIED:20260527T072127Z
UID:19431-1780405200-1780410600@math.bas.bg
SUMMARY:Съвместен семинар на МЦМН и секция АГТ
DESCRIPTION:Date and time: Tuesday\, June 2-nd\, 2026\, 13:00\, room 403 IMI-BAS \nLecturer: Bogdan Djordjevic\, (Serbian Academy of Arts and Sciences\, visitor at ICMS\, IMI-BAS) \nTitle: Application of the Laplace transform for evaluating sums of hyperharmonic-like series in Banach algebras and modules \nAbstract: In this talk it will be shown how the Laplace transform (in respective Banach spaces) can be utilized for evaluating sums of Banach-space-valued series. We demonstrate the technique on various abstract generalizations of the numerical hyperharmonic series\, including noncommutative setting and non-invertible setting. As an application\, we obtain new necessary consistency condition for the Sylvester equation \(\)ax-xb=c[\latex].
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-%d0%bc%d1%86%d0%bc%d0%bd-%d0%b8-%d1%81%d0%b5%d0%ba%d1%86%d0%b8%d1%8f-%d0%b0%d0%b3%d1%82-3/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
END:VEVENT
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