BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Institute of Mathematics and Informatics - ECPv6.0.8//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Institute of Mathematics and Informatics
X-ORIGINAL-URL:https://math.bas.bg/?lang=en
X-WR-CALDESC:Events for Institute of Mathematics and Informatics
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Europe/Sofia
BEGIN:DAYLIGHT
TZOFFSETFROM:+0200
TZOFFSETTO:+0300
TZNAME:EEST
DTSTART:20250330T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0300
TZOFFSETTO:+0200
TZNAME:EET
DTSTART:20251026T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0200
TZOFFSETTO:+0300
TZNAME:EEST
DTSTART:20260329T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0300
TZOFFSETTO:+0200
TZNAME:EET
DTSTART:20261025T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20260421T140000
DTEND;TZID=Europe/Sofia:20260421T153000
DTSTAMP:20260421T174211
CREATED:20260313T181017Z
LAST-MODIFIED:20260414T192821Z
UID:18987-1776780000-1776785400@math.bas.bg
SUMMARY:National Seminar on Probability and Statistics
DESCRIPTION:The next meeting of the \nNational Seminar on Probability and Statistics\n \nwill be held on April 21\, 2026\, at 2:00 p.m. in Room 503 of the Institute of Mathematics and Informatics. \nA talk on: \nHow long does it take to train an Elephant Random Walk\nwill be delivered by \nZheng Fang (University of Zurich). \nAbstract: We study how conditioning on the first \(k\) steps\, which we think of as training\, affects the long-term behavior of the Elephant Random Walk. When the elephant is conditioned to be at position \(k\) at time \(k\)\, the first return time to the origin scales as \(k^{(4−4p)⁄(3−4p)}\) in the diffusive regime\, and grows exponentially in the critical regime. We loosely interpret this as a measurement of the rate at which the elephant forgets its training. \nMore information about the talk can be found on the seminar website:\nhttp://www.math.bas.bg/~statlab/NSPS/
URL:https://math.bas.bg/event/national-seminar-on-probability-and-statistics-41/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Regular Seminar
ORGANIZER;CN="Institute%20of%20Mathematics%20and%20Informatics%2C%20BAS":MAILTO:office@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20260415T140000
DTEND;TZID=Europe/Sofia:20260415T153000
DTSTAMP:20260421T174211
CREATED:20260414T191905Z
LAST-MODIFIED:20260414T192154Z
UID:19099-1776261600-1776267000@math.bas.bg
SUMMARY:ICMS Geometry Seminar
DESCRIPTION:A talk on\nPhase Tropical hypersurfaces and their cousins\nwill be delivered by\n\nIlia Zharkov (KSU)\n\non Wednesday\, April 15\, 14:00 in room 403\, and via Zoom.\n\n\nMore details can be found on the website:\nhttps://icms.bg/phase-tropical-hypersurfaces-and-their-cousins-geometry-seminar-talk-by-ilia-zharkov/\n\nZoom link: \nhttps://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1
URL:https://math.bas.bg/event/copy-icms-geometry-seminar-2/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Regular Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20260406T141500
DTEND;TZID=Europe/Sofia:20260406T153000
DTSTAMP:20260421T174211
CREATED:20260404T110836Z
LAST-MODIFIED:20260404T110836Z
UID:19095-1775484900-1775489400@math.bas.bg
SUMMARY:Optimization Seminar
DESCRIPTION:On April 6\, 2026 (Monday) at 2:15 p.m. in Room 478 of IMI-BAS\, a joint meeting of \nThe Seminar on Optimization (PMI) and the Seminar on Operations Research (IMI) will be held. \nA talk on \nHausdorff characterizations of first countable T1 spaces via fixed point theorems\nwill be delivered by Detelina Kamburova. \nEverybody is invited.
URL:https://math.bas.bg/event/optimization-seminar/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Regular Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20260403T130000
DTEND;TZID=Europe/Sofia:20260403T143000
DTSTAMP:20260421T174211
CREATED:20260330T115722Z
LAST-MODIFIED:20260330T120830Z
UID:19025-1775221200-1775226600@math.bas.bg
SUMMARY:Algebra and Logic Seminar
DESCRIPTION:The next meeting of the Algebra and Logic Seminar will take place on April 3\, 2026 (Friday) at 1:00 pm (UTC+3) in online format via Zoom. \nA talk on: \nOn Pairs of Non-commuting Hermitian Operators on the Unitary Plane which are Permutable Measurements\nwill be delivered by \nValentin Iliev (IMI-BAS).\nAbstract. In this presentation we study observables with spectre {-1\,1} on quantum systems with the unitary plane as a space of states. Examples of such quantum systems are spin-1/2 particles. We find necessary and sufficient conditions for two non-commuting observables to be permutable measurements\, that is\, the probability of obtaining a particular pair of results does not depend on the order of taking these measurements. Several examples are presented. \nLink to the zoom meeting:\nhttps://us02web.zoom.us/j/88300991142?pwd=wGYl7VaD9RZKEm99sKzHMzl3bYCv3J.1\nEverybody is invited. \nAlgebra and Logic Department\, IMI – BAS\nhttp://www.math.bas.bg/algebra/seminarAiL/\n============================== =====================
URL:https://math.bas.bg/event/algebra-and-logic-seminar-120/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Regular Seminar
ORGANIZER;CN="Department%20of%20Algebra%20and%20Logic":MAILTO:algebra_logic_seminar@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20260331T140000
DTEND;TZID=Europe/Sofia:20260331T153000
DTSTAMP:20260421T174211
CREATED:20260326T210831Z
LAST-MODIFIED:20260326T210831Z
UID:19020-1774965600-1774971000@math.bas.bg
SUMMARY:Seminar of the SofTIS Department
DESCRIPTION:You are welcome to join the  Scientific seminar of the Dept. Software Technologies and Information Systems on  31st March 2026\, Tuesday\, from 14.00 (UTC+02). The seminar will be in hybrid format: in 278 hall in the building of IMI-BAS and via  ZOOM.  Assist.  Ventsislav Polimenov will give a talk\, entitled: “ANNSIA – Adaptive Neural Network for Satellite Image Analysis“. The talk will show an innovative approach to leaf area index estimation using a multi-sensor deep neural network that combines Sentinel-2 and Landsat 8/9 data. The study addresses two primary challenges\, namely the absence of in-situ data for training and the substantial differences in spatial and spectral characteristics between the sensors. The model employs a Multi-Sensor U-Net with Conditional Batch Normalisation\, enabling unified processing of heterogeneous sensor inputs and the learning of sensor-agnostic vegetation representations. Training is conducted through a VI-ensemble approach that generates pseudo-LAI labels without requiring field measurements. Data balancing strategies and spatial block validation ensure reliable assessment of model accuracy and generalisation capacity. The results are presented in lecturer`s PhD thesis (to be defended) and demonstrate improved model performance when leveraging information from both satellites\, as well as successful transfer to new geographic regions and time periods. This constitutes a contribution to the still underexplored field of multi-sensor remote sensing and establishes a foundation for future extensions to other biophysical variables and the integration of additional satellite data sources.
URL:https://math.bas.bg/event/seminar-of-the-softis-department-10/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Workshop
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20260326T140000
DTEND;TZID=Europe/Sofia:20260326T150000
DTSTAMP:20260421T174211
CREATED:20260321T092731Z
LAST-MODIFIED:20260321T092747Z
UID:19012-1774533600-1774537200@math.bas.bg
SUMMARY:Sofia One Board Seminar
DESCRIPTION:Next talk: How playing a game gives you the largest collection of numbers (Hackenbush) \nDate: Thursday\, 26 March 2026\, 2:00 – 3:00 pm. \nRoom: 278 \nSpeaker: Aldayr de Jesús Silva Contreras \nAbstract: John H. Conway was one of the most free-spirited mathematicians of all time. A testament to this can be seen throughout his works and through some funny anecdotes about him told by his peers and students. In particular\, this can be felt by going through his collection of books titled Winning Ways for your mathematical plays. \nIn this one board seminar\, I will discuss one particular game described in the first volume of this collection of books and how this led him to the discovery of the largest collection of numbers\, and I will also share some remarks on this fascinating construction. \n  \nOrganizers: \n\nChristelle Kozaily\nHiginio Serrano Garcia\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nFor more information: https://sites.google.com/view/one-board-seminar-sofia/inicio\,  oneseminarinsofia@gmail.com\, https://icms.bg/category/one-board/ \nThis seminar is organized for early-career researchers from IMI\, ICMS and the faculty. This would be a great opportunity for young researchers to meet and exchange ideas in an informal and interactive setting. \nWe meet every Thursday at 2:00 pm in room 478. 
URL:https://math.bas.bg/event/sofia-one-board-seminar-2/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Workshop
ORGANIZER;CN="Christelle%20Kozaily%20and%20Higinio%20Serrano%20Garcia":MAILTO:hserrano@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20260325T140000
DTEND;TZID=Europe/Sofia:20260325T153000
DTSTAMP:20260421T174211
CREATED:20260320T114625Z
LAST-MODIFIED:20260320T115505Z
UID:19003-1774447200-1774452600@math.bas.bg
SUMMARY:ICMS Geometry Seminar
DESCRIPTION:The second talk by\n\nTurgay Akyar (IMI-BAS)\n\nwho will continue speaking about\n\nAlgebraic Curves and Brill–Noether Theory.\n\nwill be delivered on Wednesday\, March 25\, 14:00 in room 578\, and via Zoom.\n\n\nMore details can be found on the website:\n\n\nAlgebraic Curves and Brill–Noether Theory\, Geometry seminar talk by Turgay Akyar \n\nZoom link: \nhttps://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1
URL:https://math.bas.bg/event/icms-geometry-seminar-13/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Regular Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20260323T143000
DTEND;TZID=Europe/Sofia:20260323T153000
DTSTAMP:20260421T174211
CREATED:20260319T161702Z
LAST-MODIFIED:20260319T161836Z
UID:18998-1774276200-1774279800@math.bas.bg
SUMMARY:Didactical Modeling Seminar
DESCRIPTION:The next meeting of the seminar \nDidactical Modeling\nwill be held on March 23\, 2026\, at 2:30 pm in Room 278 of IMI – BAS. \nA talk on: \nAnalysis of the results of the Regional Round of the National Mathematical Olympiad of 4th – 7th Grae in 2026\nwill be delivered by \nNevena Sabeva and Boyanka Savova.
URL:https://math.bas.bg/event/didactical-modeling-seminar-43/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Regular Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20260319T140000
DTEND;TZID=Europe/Sofia:20260319T150000
DTSTAMP:20260421T174211
CREATED:20260317T090114Z
LAST-MODIFIED:20260317T090114Z
UID:18996-1773928800-1773932400@math.bas.bg
SUMMARY:Sofia One Board Seminar
DESCRIPTION:Next talk: Frieze Patterns \nDate: Thursday\, 19 March 2026\, 2:00 – 3:00 pm. \nRoom: 478 \nSpeaker: Deepanshu Prasad \nAbstract: Frieze patterns\, introduced by H. S. M. Coxeter and John Conway\, are arrays of numbers satisfying a simple local determinant rule. Despite their elementary definition\, they have deep connections with combinatorics\, cluster algebras\, and representation theory. In this talk\, I will briefly review classical frieze patterns and then discuss infinite friezes. I will describe their basic properties and illustrate how they arise naturally in combinatorial and representation-theoretic settings. \nOrganizers: \n\nChristelle Kozaily\nHiginio Serrano Garcia\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nFor more information: https://sites.google.com/view/one-board-seminar-sofia/inicio\,  oneseminarinsofia@gmail.com \nThis seminar is organized for early-career researchers from IMI\, ICMS and the faculty. This would be a great opportunity for young researchers to meet and exchange ideas in an informal and interactive setting. \nWe meet every Thursday at 2:00 pm in room 478. 
URL:https://math.bas.bg/event/sofia-one-board-seminar/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Workshop
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20260318T140000
DTEND;TZID=Europe/Sofia:20260318T153000
DTSTAMP:20260421T174211
CREATED:20260313T180211Z
LAST-MODIFIED:20260313T180423Z
UID:18982-1773842400-1773847800@math.bas.bg
SUMMARY:ICMS Geometry Seminar
DESCRIPTION:Next session of the Geometry Seminar of ICMS is scheduled for the next Wednesday\, March 18\, 14:00\, room 403 (and via Zoom). \nSneha Chaubey (Indraprastha Institute of Information Technology) \nwill give a talk titled \nDistribution and Correlation of Polynomial Farey Fractions\n\n\nMore details can be found here: \n\nDistribution and Correlation of Polynomial Farey Fractions\, Geometry seminar talk by Sneha Chaubey \n\nhttps://icms.bg/distribution-and-correlation-of-polynomial-farey-fractions-geometry-seminar-talk-by-sneha-chaubey/ \nZoom link: \nhttps://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1
URL:https://math.bas.bg/event/icms-geometry-seminar-12/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Regular Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20260317T130000
DTEND;TZID=Europe/Sofia:20260317T143000
DTSTAMP:20260421T174211
CREATED:20260308T223545Z
LAST-MODIFIED:20260308T223545Z
UID:18965-1773752400-1773757800@math.bas.bg
SUMMARY:ICMS Seminar
DESCRIPTION:Two lectures by Milen Yakimov\,\nchair of the group on Cluster Algebras and Quantum Groups at the ICMS\, IMI-BAS.\n\nTuesday\, March 10\, at 13:00 in room 403\, IMI-BAS.\nCluster structures on quantum groups and the full Berenstein-Zelevinsky conjecture\n\nTuesday\, March 17\, at 13:00 in room 403\, IMI-BAS.\nReflective centres of module categories and quantum K-matrices\n\nAbstracts:\nMarch 10: Cluster Algebras were invented by Fomin and Zelevinsky in the early 2000s and quickly turned into an indispensable tool in many areas of mathematics. In this talk\, we will provide a gentle introduction to the subject. From the early days of the theory of cluster algebras\, one of the desired constructions was to turn the quantized coordinate rings of complex simple Lie groups into quantum cluster algebras. This remained elusive. We will present a resolution of this conjecture and of the Berenstein-Zelevinsky conjecture on cluster structures on quantum double Bruhat cells. This is a joint work with Fan Qin and Hironori Oya.\n\nMarch 17: Braided monoidal categories have applications in various situations. In particular\, their universal R-matrices give solutions of the quantum Yang-Baxter equation and representations of braid groups of type A. There are powerful methods for constructing them: Drinfeld doubles of Hopf algebras and Drinfeld centres of monoidal categories. On the other hand\, universal K-matrices\, leading to solutions of the reflection equation and representations of braid groups of type B are much less well understood and there are no general constructions for them. We will describe a construction of reflective centers of module categories. It gives rise to a quantum double construction for universal K-matrices\, which can be viewed as a type B analog of Drinfeld’s double construction. This is a joint work with Robert Laugwitz and Chelsea Walton.\n\nMore information can be found on the seminar’s web-page:\nhttps://icms.bg/category/icms-seminar/
URL:https://math.bas.bg/event/icms-seminar-44/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Regular Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20260311T140000
DTEND;TZID=Europe/Sofia:20260311T153000
DTSTAMP:20260421T174211
CREATED:20260308T222721Z
LAST-MODIFIED:20260308T223140Z
UID:18957-1773237600-1773243000@math.bas.bg
SUMMARY:ICMS Geometry Seminar
DESCRIPTION:The talk entitled\nAlgebraic Curves and Brill–Noether Theory\nby\nTurgay Akyar (IMI-BAS)\nwill be delivered at the Geometry Seminar of ICMS on\nWednesday (11th of March) at 2:00 pm (GMT+2)\nin room 278 and via zoom.\n\nMore details can be found here:\n\nAlgebraic Curves and Brill–Noether Theory\, Geometry seminar talk by Turgay Akyar \n\nZoom link:\nhttps://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1
URL:https://math.bas.bg/event/copy-icms-geometry-seminar/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Regular Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20260310T130000
DTEND;TZID=Europe/Sofia:20260310T143000
DTSTAMP:20260421T174211
CREATED:20260308T223413Z
LAST-MODIFIED:20260308T223453Z
UID:18962-1773147600-1773153000@math.bas.bg
SUMMARY:ICMS Seminar
DESCRIPTION:Two lectures by Milen Yakimov\,\nchair of the group on Cluster Algebras and Quantum Groups at the ICMS\, IMI-BAS.\n\nTuesday\, March 10\, at 13:00 in room 403\, IMI-BAS.\nCluster structures on quantum groups and the full Berenstein-Zelevinsky conjecture\n\nTuesday\, March 17\, at 13:00 in room 403\, IMI-BAS.\nReflective centres of module categories and quantum K-matrices\n\nAbstracts:\nMarch 10: Cluster Algebras were invented by Fomin and Zelevinsky in the early 2000s and quickly turned into an indispensable tool in many areas of mathematics. In this talk\, we will provide a gentle introduction to the subject. From the early days of the theory of cluster algebras\, one of the desired constructions was to turn the quantized coordinate rings of complex simple Lie groups into quantum cluster algebras. This remained elusive. We will present a resolution of this conjecture and of the Berenstein-Zelevinsky conjecture on cluster structures on quantum double Bruhat cells. This is a joint work with Fan Qin and Hironori Oya.\n\nMarch 17: Braided monoidal categories have applications in various situations. In particular\, their universal R-matrices give solutions of the quantum Yang-Baxter equation and representations of braid groups of type A. There are powerful methods for constructing them: Drinfeld doubles of Hopf algebras and Drinfeld centres of monoidal categories. On the other hand\, universal K-matrices\, leading to solutions of the reflection equation and representations of braid groups of type B are much less well understood and there are no general constructions for them. We will describe a construction of reflective centers of module categories. It gives rise to a quantum double construction for universal K-matrices\, which can be viewed as a type B analog of Drinfeld’s double construction. This is a joint work with Robert Laugwitz and Chelsea Walton.\n\nMore information can be found on the seminar’s web-page:\nhttps://icms.bg/category/icms-seminar/
URL:https://math.bas.bg/event/icms-seminar-43/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Regular Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20260225T140000
DTEND;TZID=Europe/Sofia:20260225T153000
DTSTAMP:20260421T174211
CREATED:20260130T143214Z
LAST-MODIFIED:20260218T093953Z
UID:18832-1772028000-1772033400@math.bas.bg
SUMMARY:ICMS Geometry Seminar
DESCRIPTION:The postponed talk entitled\nTropical curves with applications\nby\nPeter Petrov (IMI-BAS)\nwill be delivered at the Geometry Seminar of ICMS on\nWednesday (25th of February) at 2:00 pm (GMT+2)\nin room 403 and via zoom.\n\nMore details can be found here:\n\nTropical curves with applications\, Geometry seminar talk by Petar Petrov \n\nZoom link:\nhttps://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1
URL:https://math.bas.bg/event/icms-geometry-seminar-11/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Regular Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20260127T130000
DTEND;TZID=Europe/Sofia:20260127T143000
DTSTAMP:20260421T174211
CREATED:20260127T141628Z
LAST-MODIFIED:20260127T141757Z
UID:18827-1769518800-1769524200@math.bas.bg
SUMMARY:ICMS Seminar
DESCRIPTION:Time and place: Tuesday\, January 27th\, 2026\, 1:00 pm\, room 403 IMI-BAS. \nLecturer: Jean-Pierre Gazeau (Université Paris Cité\, CNRS\, and University of Białystok) \nTitle: Spectral and angular variables for open qudit dynamics \nAbstract:  In this talk\, I introduce a parametrization of finite-dimensional quantum states that is particularly adapted to the study of open qudit dynamics. Any generic density matrix in Cn can be described by separating spectral variables\, which encode the eigenvalue content\, from angular variables associated with the unitary degrees of freedom. These angular variables naturally live on the coset space SU(n)/T\, in the spirit of the Tilma–Sudarshan construction.\nA key outcome of this parametrization is a partial decoupling of the GKLS evolution: while the angular variables are driven by both the Hamiltonian and the dissipative contributions\, the spectral variables evolve under the dissipative part only. This separation provides a transparent geometric picture of decoherence and dissipation. Simple examples for qubits and qutrits are discussed\, together with an alternative\, geometrically motivated notion of purity expressed solely in terms of the spectral variables in a linear way. \nMore information can be found on the seminar’s web-page:\nhttps://icms.bg/category/icms-seminar/
URL:https://math.bas.bg/event/icms-seminar-42/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Regular Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20260120T130000
DTEND;TZID=Europe/Sofia:20260120T143000
DTSTAMP:20260421T174211
CREATED:20260115T144514Z
LAST-MODIFIED:20260115T144514Z
UID:18783-1768914000-1768919400@math.bas.bg
SUMMARY:ICMS Seminar
DESCRIPTION:Time and place: Tuesday\, January 20th\, 2026\, 1:00 pm\, room 403 IMI-BAS. \nLecturer: Bogdan Đorđević (Serbian Academy of Arts and Sciences) \nTitle: Applications of Banach algebras and Banach modules to some contemporary analysis problems \nAbstract:\nIn recent years applied mathematics has experienced a historical progress\, blurring the lines between the previously clear research paths and directions. Accordingly\, contemporary mathematical analysis is at the verge of unifying seemingly different research areas and topics. With this in mind\, I’d like to talk about my humble contribution to this cause: my lecture will concern how Banach algebras and modules\, combined with spectral theory\, functional calculus\, and generalized inverses\, help in various problems that emerge in applied mathematics in general: from solving operator and matrix equations\, to evaluating sums of some Banach-space-valued series\, to analyzing some unstable abstract Cauchy problems\, and finally to approximating solutions to functional stochastic differential equations. \nMore information can be found on the seminar’s web-page:\nhttps://icms.bg/category/icms-seminar/
URL:https://math.bas.bg/event/icms-seminar-41/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Regular Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20260112T140000
DTEND;TZID=Europe/Sofia:20260112T163000
DTSTAMP:20260421T174211
CREATED:20260111T123322Z
LAST-MODIFIED:20260111T123322Z
UID:18742-1768226400-1768235400@math.bas.bg
SUMMARY:Singularities Seminar
DESCRIPTION:Time and place: January 12\, 2026\, Monday\, at 2:00 pm\, in Room 578\, Institute of Mathematics and Informatics – Bulgarian Academy of Sciences\nLecturer:  Valdemar Tsanov (IMI-BAS)\nTitle: Geometry of Milnor fibrations of equivariant plane curves\nAbstract: The local knot of an irreducible C*-equivariant complex plane curve singularity is a torus knot\, and the Milnor fiber is a Seifert surface for this knot. I will describe an explicit universal cover of the Milnor fiber by the hyperbolic plane\, using automorphic forms for triangle groups. The characteristic morphism of the Milnor fibration can also be recovered\, and used to construct geometric structures by universal covers on the knot complement in the 3-sphere\, as well as on the complement of the singular curve in the complex plane.
URL:https://math.bas.bg/event/singularities-seminar-3/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Regular Seminar
ORGANIZER;CN="Institute%20of%20Mathematics%20and%20Informatics%2C%20BAS":MAILTO:office@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20251216T140000
DTEND;TZID=Europe/Sofia:20251216T170000
DTSTAMP:20260421T174211
CREATED:20251209T142710Z
LAST-MODIFIED:20251209T142710Z
UID:18673-1765893600-1765904400@math.bas.bg
SUMMARY:Annual Scientific Session of the Analysis\, Geometry and Topology Department
DESCRIPTION:The Annual Scientific Section of the Department of \nAnalysis\, Geometry and Topology \nwill be held on December 16\, 2025\, at 2:00 pm in Room 478 of IMI – BAS. \nPROGRAMME
URL:https://math.bas.bg/event/annual-scientific-session-of-the-analysis-geometry-and-topology-department-3/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Workshop
ORGANIZER;CN="Department%20of%20Analysis%2C%20Geometry%20and%20Topology":MAILTO:vmil@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20251216T093000
DTEND;TZID=Europe/Sofia:20251216T120000
DTSTAMP:20260421T174211
CREATED:20251211T152334Z
LAST-MODIFIED:20251211T152334Z
UID:18705-1765877400-1765886400@math.bas.bg
SUMMARY:Annual Scientific Session of the Department of Operations Research\, Probability and Statistics
DESCRIPTION:TheAnnual Scientific Session of the Department of \nOperation Research\, Probability and Statistics\nwill be held on December 16\, 2025 (Tuesday) at 09:30 am in room 503 of IMI-BAS. \nPROGRAMME
URL:https://math.bas.bg/event/annual-scientific-session-of-the-department-of-operations-research-probability-and-statistics-3/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Workshop
ORGANIZER;CN="Department%20of%20Operations%20Research%2C%20Probability%20and%20Statistics":MAILTO:jeni@math.bas.bg;
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20251215T110000
DTEND;TZID=Europe/Sofia:20251215T143000
DTSTAMP:20260421T174211
CREATED:20251211T105649Z
LAST-MODIFIED:20251211T105649Z
UID:18700-1765796400-1765809000@math.bas.bg
SUMMARY:Annual Scientific Session of the Department of Mathematical Modeling and Numerical Analysis
DESCRIPTION:The annual scientific session of the Department of  \nMathematical Modeling and Numerical Analysis\nwill be held on Monday\, December 15\, 2025\, at 11:00 a.m. in room 503 of IMI-BAS. \nPROGRAMME
URL:https://math.bas.bg/event/annual-scientific-session-of-the-department-of-mathematical-modeling-and-numerical-analysis/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Workshop
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20251215
DTEND;VALUE=DATE:20251220
DTSTAMP:20260421T174211
CREATED:20251210T102758Z
LAST-MODIFIED:20251210T102758Z
UID:18695-1765756800-1766188799@math.bas.bg
SUMMARY:International Conference on Quantum Groups and Cluster Algebras
DESCRIPTION:The International Center for Mathematical Sciences – Sofia (ICMS-Sofia) hosts an international conference on \nQuantum Groups and Cluster Algebras \nbetween 15-19 December 2025 at the Institute of Mathematics and Informatics\, Bulgarian Academy of Sciences. \nThe aim of this conference is to bring together researchers to share recent advances\, promote further developments in the theory of Quantum Groups and Cluster Algebras\, and to investigate their interactions and applications across mathematics and physics. Quantum groups and cluster algebras both provide frameworks for encoding algebraic and geometric structures arising in representation theory\, geometry\, and mathematical physics. Quantum groups\, as deformations of universal enveloping algebras\, capture generalized symmetries with rich categorical and representation-theoretic properties. On the other hand\, Cluster algebras\, introduced by Fomin and Zelevinsky\, appear as important algebraic varieties and reveal properties of them through combinatorial rules. Cluster algebras are essential in the study of canonical bases in diverse settings. \nTo see the Programme and for further information please visit:\nhttps://icms.bg/international-conference-quantum-groups-and-cluster-algebras-2025/
URL:https://math.bas.bg/event/international-conference-on-quantum-groups-and-cluster-algebras/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Conference
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20251212T094500
DTEND;TZID=Europe/Sofia:20251212T174500
DTSTAMP:20260421T174211
CREATED:20251205T081620Z
LAST-MODIFIED:20251205T081620Z
UID:18659-1765532700-1765561500@math.bas.bg
SUMMARY:Annual Scientific Session of the Algebra and Logic Department
DESCRIPTION:The annual Scientific Session of the Department of Algebra and Logic will be held on December 12th (Friday) at 9:45 am in Room 578 of IMI – BAS.\n\n\nProgramme\n9:45 – 10:00 Opening\n\n10:00 – 10:20 Vesselin Drensky: Dihedral invariants of the free associative algebra of rank two\n(joint results with Silvia Boumova and Şehmus Fındık).\n10:20 – 10:50 Tatiana Gateva-Ivanova: Finite idempotent braided sets and their quadratic algebras\n\n10:50 – 11:00 Break\n\n11:00 – 11:20 Emil Kolev: Covering problems\n11:20 – 11:40 Ivan Chipchakov: Application of primary tensor product decompositions to the normality question for locally finite-dimensional central division algebras\n\n11:40 – 11:50 Break\n\n11:50 – 12:10 Veselin Filev: Holographic flavour and neural networks\n12:10 – 12:30 Elitza Hristova: Tensor products of Lie nilpotent associative algebras\n\n12:30 – 13:30 Lunch Break\n\n13:30 – 13:50 Jörg Koppitz: On Semigroups of Order-Preserving Transformations with the Same Fix Set\n13:50 – 14:10 Dimitrinka Vladeva: Why we study semicentral idempotent matrices?\n\n14:10 – 14:20 Break\n\n14:20 – 14:50 Hristo Iliev: On decomposable Tschirnhausen structures and their applications to smooth and non-reduced components of Hilbert schemes of curves\n14:50 – 15:20 Ali Raad: Constructing Cartan subalgebras in non-classifiable C*-algebras\n\n15:20 – 15:30 Break\n\n15:30 – 15:50 Petar Iliev: Intuitionistic formulae with equivalence are exponentially more succinct\n15:50 – 16:10 Tatyana Ivanova: The fragment of elementary plane Euclidean geometry\, based on perpendicularity alone – decidability and complexity (joint with T. Tinchev)\n\n16:10 – 16:20 Break\n\n16:20 – 16:40 Vilislav Boutchaktchiev: On the Estimation Error of the Expected Inferred Loss Rate\n16:40 – 17:10 Marin Genov: Some algebraic aspects of analysis over finite-dimensional commutative algebras\n\n17:10 – 17:15 Break\n17:15 – 17:35 Yacine Barhoumi-Andreani: The Tracy-Widom process\n\n\nПоканват се всички желаещи да присъстват.\n\nОт секция “Алгебра и логика”\nhttps://www.math.bas.bg/algebra/seminarAiL/
URL:https://math.bas.bg/event/annual-scientific-session-of-the-algebra-and-logic-department-2/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Workshop
ORGANIZER;CN="Department%20of%20Algebra%20and%20Logic":MAILTO:algebra_logic_seminar@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20251212
DTEND;VALUE=DATE:20251214
DTSTAMP:20260421T174211
CREATED:20251209T133734Z
LAST-MODIFIED:20251209T133734Z
UID:18667-1765497600-1765670399@math.bas.bg
SUMMARY:International Conference “Early Career Mathematicians in the Balkans” 2025
DESCRIPTION:International Conference “Early Career Mathematicians in the Balkans”\nDecember 12 – 13\, 2025\, Sofia \n\n\n\n\n\nThe conference is hosted by the International Center for Mathematical Science at IMI-BAS\, Sofia\, as a forum for early carrier researchers working across the Balkan region. \nThe aim is to provide an opportunity for outstanding young researchers to share knowledge on modern mathematics\, with the hope of fostering the creation of lasting research networks in the region\, and strengthening the relations between the academic communities. \nSupported by the Scientific Programme “Enhancing the Research Capacity in Mathematical Sciences (PIKOM)”\, No. DO1-67/05.05.2022. \n\n\n\n\n\nPROGRAMME \nFor further information: https://icms.bg/international-conference-early-career-mathematicians-in-the-balkans-2025/
URL:https://math.bas.bg/event/international-conference-early-career-mathematicians-in-the-balkans-2025/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Conference
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20251210T150000
DTEND;TZID=Europe/Sofia:20251210T163000
DTSTAMP:20260421T174211
CREATED:20251205T143322Z
LAST-MODIFIED:20251205T143322Z
UID:18663-1765378800-1765384200@math.bas.bg
SUMMARY:Applied Mathematics Seminar
DESCRIPTION:The next meeting of the Applied Mathematics Seminar will be held on December 10 (Wednesday) at 3:00 PM in room 503 of IMI-BAS. \nLecturer: Giuseppe D’Onofrio (Politecnico di Torino\, Италия) \nTitle: ADDITIVE SUBORDINATION OF MULTIPARAMETER MARKOV PROCESSES \nAbstract: In this talk\, we consider multiparameter multidimensional Markov processes that are time-changed by an independent additive subordinator\, obtained from a Lévy process by relaxing the condition of stationary increments. By extending Phillips theorem\, we show that the resulting process is a Feller evolution and we characterize its generator. We further derive its pseudo-differential representation and show that its symbol admits a Lévy-Khintchine representation. As an application\, we consider a factor-based specification for the Ornstein-Uhlenbeck process subordinated by a Sato process. The constructive nature of this process is inspired by applications in finance which will be briefly discussed.
URL:https://math.bas.bg/event/applied-mathematics-seminar-17/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Regular Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20251210T143000
DTEND;TZID=Europe/Sofia:20251210T180000
DTSTAMP:20260421T174211
CREATED:20251204T133047Z
LAST-MODIFIED:20251204T133047Z
UID:18656-1765377000-1765389600@math.bas.bg
SUMMARY:Annual Scientific Session of Mathematical Linguistics Department
DESCRIPTION:The annual scientific session of the Department of \nMathematical Linguistics \n will be held on December 10\, 2025\, at 2:30 pm in Room 278. \nPROGRAMME
URL:https://math.bas.bg/event/annual-scientific-session-of-mathematical-linguistics-department/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Workshop
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20251209T141500
DTEND;TZID=Europe/Sofia:20251209T153000
DTSTAMP:20260421T174211
CREATED:20251204T102243Z
LAST-MODIFIED:20251204T103211Z
UID:18648-1765289700-1765294200@math.bas.bg
SUMMARY:Seminar in Operations Research\, Probability and Statistics
DESCRIPTION:On December 09\, 2025 (Tuesday) at 14:15 in room 503 of IMI-BAS and online via Zoom Dr. Sebastian Tapia Garcia\, research unit Variational Analysis\, Dynamics and Operations Research\, Vienna University of Technology\nwill give a talk at the Operations Research\, Probability and Statistics Seminar on: \nDifferentiable functions with surjective generalized Jacobians.\nAbstract: In this talk we start with a brief discussion about the possible values that the limiting and Clarke Jacobians can take in the class of differentiable locally Lipschitz functions (defined on finite dimensional spaces). Then\, we construct a differentiable locally Lipschitz function \(f:R^n\to R^m\) such that\, for any nonempty compact connected \(C \subset R^{n х m}\)\, we can find a point \(x\) in \(R^n\) such that \(C\) coincides with the limiting Jacobian of \(f\) at \(x\). In particular\, the Clarke Jacobian of \(f\) ranges all its possible values. \nThis work has been done in collaboration with Aris Daniilidis and Robert Deville. \nThe Zoom link is\nhttps://us02web.zoom.us/j/82516739771?pwd=bwANwCbtbc7nRDAOjo0HuoyarUauAS.1 \nEveryone interested in the topic is cordially invited to participate.
URL:https://math.bas.bg/event/seminar-in-operations-research-probability-and-statistics-3/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Regular Seminar
ORGANIZER;CN="Department%20of%20Operations%20Research%2C%20Probability%20and%20Statistics":MAILTO:jeni@math.bas.bg;
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20251205T130000
DTEND;TZID=Europe/Sofia:20251205T143000
DTSTAMP:20260421T174211
CREATED:20251202T111458Z
LAST-MODIFIED:20251202T111625Z
UID:18632-1764939600-1764945000@math.bas.bg
SUMMARY:Algebra and Logic Seminar
DESCRIPTION:The next meeting of the Algebra and Logic Seminar will take place in hybrid form on December 5\, 2025 (Friday) at 1:00 pm (UTC+3) in Room 578 of IMI-BAS and online via Zoom. \nA talk on: \nClassical Results in ITL with the Neighbourhood Modalities and Their Short Proofs Using Separation\nwill be delivered by \nDimitar Guelev (IMI-BAS).\nLink to the zoom meeting:\nHttps://us02web.zoom.us/j/85137375021?pwd=RE5QczdFTE1xL1R6MnI2b1lkcGczQT09\nEverybody is invited. \nAlgebra and Logic Department\, IMI – BAS\nhttp://www.math.bas.bg/algebra/seminarAiL/\n============================== =====================
URL:https://math.bas.bg/event/algebra-and-logic-seminar-119/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Regular Seminar
ORGANIZER;CN="Department%20of%20Algebra%20and%20Logic":MAILTO:algebra_logic_seminar@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20251205
DTEND;VALUE=DATE:20251213
DTSTAMP:20260421T174211
CREATED:20251210T101728Z
LAST-MODIFIED:20251210T102236Z
UID:18690-1764892800-1765583999@math.bas.bg
SUMMARY:International Conference on Recent Developments in Modern Hodge Theory
DESCRIPTION:Workshop on Recent Developments in Modern Hodge Theory \nDecember 5 – 12\, 2025\, Room 403 of IMI – BAS \n\n\n\n\n\n\n\n\n\n\nThis conference will survey some new results in modern Hodge theory and related topics. \nThe conference is organized by ICMS Sofia\, IMSA Miami and supported by Simons foundation. \n\n\n\n\n\nFor the Programme and further information please visit:\nhttps://icms.bg/workshop-recent-developments-in-modern-hodge-theory/ \nOn December 10th and 11th the workshop sessions will be held in Room 256 (Conference Room of IMI – BAS).
URL:https://math.bas.bg/event/workshop-on-recent-developments-in-modern-hodge-theory/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Conference
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20251204
DTEND;VALUE=DATE:20251208
DTSTAMP:20260421T174211
CREATED:20250917T135115Z
LAST-MODIFIED:20251202T112517Z
UID:18211-1764806400-1765151999@math.bas.bg
SUMMARY:National Coding Theory workshop "Professor Stefan Dodunekov"
DESCRIPTION:The National Coding Theory workshop with international participation “Profesor Stefan Dodunekov” will be held from 4th to 7th December 2025 in St. Ekaterina Garden Hotel in the village of Ribaritsa. \nThe scientific program will be held on December 5th and 6th and will include short talks (up to 20 minutes)\, thesis presentations (up to 40 minutes) and discussions. \nTo participate in the scientific program\, please send a title and a short abstract (up to one page) to Peter Boyvalenkov\, peter@math.bas.bg\, and to Tsonka Baicheva\, tsonka@math.bas.bg\, before 23.11.2025. \nThe workshop includes the annual reports session of the Mathematical Foundations of Informatics Department\, IMI-BAS\, too. \nPROGRAMME
URL:https://math.bas.bg/event/national-coding-theory-workshop-professor-stefan-dodunekov-2/?lang=en
LOCATION:St. Ekaterina Garden Hotel\, Bulgaria
CATEGORIES:Conference,Workshop
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20251203T140000
DTEND;TZID=Europe/Sofia:20251203T153000
DTSTAMP:20260421T174211
CREATED:20251202T105237Z
LAST-MODIFIED:20251202T105355Z
UID:18620-1764770400-1764775800@math.bas.bg
SUMMARY:ICMS Geometry Seminar
DESCRIPTION:It is a great pleasure to announce a talk entitled\nSL2 tropicalizations through valuation algebra\nby\nAndrei Benguş-Lasnier (IMI-BAS)\nwho will speak at the Geometry Seminar of ICMS on\nnext Wednesday (3rd of December) at 14:00\nin room 403 and via zoom.\n\nMore details can be found here:\nhttps://icms.bg/sl2-tropicalizations-through-valuation-algebra-geometry-seminar-talk-by-andrei-bengus-lasnier/\n\nZoom link:\nhttps://us02web.zoom.us/j/86186281353?pwd=6CARUygJaA3HiTNAt3norZQRFt8fIL.1
URL:https://math.bas.bg/event/icms-geometry-seminar-10/?lang=en
LOCATION:Institute of Mathematics and Informatics\, BAS\, Akad.G.Bonchev St\, bl. 8\, 1113\, Sofia\, Bulgaria
CATEGORIES:Regular Seminar
END:VEVENT
END:VCALENDAR