BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Institute of Mathematics and Informatics - ECPv6.0.8//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-ORIGINAL-URL:https://math.bas.bg
X-WR-CALDESC:Събития за 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:20220327T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0300
TZOFFSETTO:+0200
TZNAME:EET
DTSTART:20221030T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20220311T140000
DTEND;TZID=Europe/Sofia:20220311T153000
DTSTAMP:20260626T043953
CREATED:20220306T110044Z
LAST-MODIFIED:20220306T112140Z
UID:12007-1647007200-1647012600@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 11 март 2022 г. (петък) от 14:00 ч. ще се проведе дистанционно заседание на семинара по „Алгебра и логика”. \nДоклад на тема: \nMulti-summation in difference rings and applications\nще изнесе Carsten Schneider (Research Institute for Symbolic Computation\, Johannes Kepler University\, Linz\, Austria). \nРезюме. Symbolic summation in difference fields started with Karr’s summation algorithm (1981) which can be considered as the discrete version of Risch’s indefinite integration algorithm in differential fields. In the last 20 years this approach has been generalized and enhanced to a constructive summation theory of difference rings.\nIn general\, one can represent algorithmically any expression in terms of indefinite nested sums defined over hypergeometric products in such rings. As a crucial by-product one obtains optimal representations where the arising sums and products are algebraically independent among each other. In particular\, difference ring algorithms have been developed that enable one to simplify certain classes of definite multi-sums to expressions in terms of indefinite nested sums defined over hypergeometric products.\nWithin this machinery one can apply Zeilberger’s creative telescoping paradigm in order to compute linear recurrences for definite multi-sums and one can find all solutions of linear recurrences that can be expressed in terms of indefinite nested sums and products. In this talk we will present this algorithmic difference ring theory for symbolic summation implemented in the summation package Sigma and will illustrate its potential by non-trivial applications coming\, e.g.\, from combinatorics and elementary particle physics.\n  \nСеминарът ще се проведе посредством платформата Zoom и всеки желаещ може да се присъедини като последва линка: \nhttps://us02web.zoom.us/j/85137375021?pwd=RE5QczdFTE1xL1R6MnI2b1lkcGczQT09 \nTopic: Онлайн семинар на секция “Алгебра и логика”\nTime: Mar 11\, 2022 02:00 PM Sofia\nMeeting ID: 851 3737 5021\nPasscode: 035647 \nОт секция „Алгебра и логика” на ИМИ – БАН\nhttp://www.math.bas.bg/algebra/seminarAiL/\n============================== =====================
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%b0%d0%bb%d0%b3%d0%b5%d0%b1%d1%80%d0%b0-%d0%b8-%d0%bb%d0%be%d0%b3%d0%b8%d0%ba%d0%b0-72/
LOCATION:Zoom
CATEGORIES:Редовен семинар
ORGANIZER;CN="%D0%A1%D0%B5%D0%BA%D1%86%D0%B8%D1%8F%20%D0%90%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0%20%D0%B8%20%D0%BB%D0%BE%D0%B3%D0%B8%D0%BA%D0%B0":MAILTO:algebra_logic_seminar@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20220314T143000
DTEND;TZID=Europe/Sofia:20220314T160000
DTSTAMP:20260626T043953
CREATED:20220309T151945Z
LAST-MODIFIED:20220309T151945Z
UID:12036-1647268200-1647273600@math.bas.bg
SUMMARY:Семинар "Дидактическо моделиране"
DESCRIPTION:Поредната сбирка на семинара \nДидактическо моделиране\nще се проведе на 14.03.2022 г. от 14:30 ч. присъствено в зала 278 на ИМИ и дистанционно в Zoom \nна \nhttps://us02web.zoom.us/j/84999372384?pwd=b2dGNHpDMVV2eHZEMjhOY3VMRDIyUT09 \nMeeting ID: 849 9937 2384    Passcode: 489610 \nДоклад на тема \nЕдна малко позната страна на афинните преобразования\n\nще изнесе \nдоц. Бойко Банчев.
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%b4%d0%b8%d0%b4%d0%b0%d0%ba%d1%82%d0%b8%d1%87%d0%b5%d1%81%d0%ba%d0%be-%d0%bc%d0%be%d0%b4%d0%b5%d0%bb%d0%b8%d1%80%d0%b0%d0%bd%d0%b5-18/
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:20220318T160000
DTEND;TZID=Europe/Sofia:20220318T173000
DTSTAMP:20260626T043953
CREATED:20220314T203522Z
LAST-MODIFIED:20220314T203752Z
UID:12050-1647619200-1647624600@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 18 март 2022 г. (петък) от 16:00 ч. ще се проведе дистанционно заседание на семинара по „Алгебра и логика”. \nДоклад на тема: \nAbsorbing ideal structures of commutative rings\nще изнесе Ece Yetkin Celikel (Hasan Kalyoncu University\, Turkey). \nРезюме. Let R be a commutative ring with nonzero identity. As generalizations of prime ideals\, the absorbing ideals were first defined and studied by A. Badawi in 2007. A proper ideal I of R is said to be 2-absorbing if whenever a\, b\, c ∈ R with abc ∈ I\, then either ab ∈ I or ac ∈ I or bc ∈ I. After this date\, many researches have been done to introduce various extensions of this concept.\nIn this talk\, we present some absorbing ideals of this class of ideals in general aspect with a number of examples\, and also we give many characterizations for some particular rings such as quasi-local rings\, Dedekind domains\, fields in terms of absorbing ideals.\n  \nСеминарът ще се проведе посредством платформата Zoom и всеки желаещ може да се присъедини като последва линка: \nhttps://us02web.zoom.us/j/85137375021?pwd=RE5QczdFTE1xL1R6MnI2b1lkcGczQT09 \nTopic: Онлайн семинар на секция “Алгебра и логика”\nTime: Mar 18\, 2022 04:00 PM Sofia\nMeeting ID: 851 3737 5021\nPasscode: 035647 \nОт секция „Алгебра и логика” на ИМИ – БАН\nhttp://www.math.bas.bg/algebra/seminarAiL/\n============================== =====================
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%b0%d0%bb%d0%b3%d0%b5%d0%b1%d1%80%d0%b0-%d0%b8-%d0%bb%d0%be%d0%b3%d0%b8%d0%ba%d0%b0-73/
LOCATION:Zoom
CATEGORIES:Редовен семинар
ORGANIZER;CN="%D0%A1%D0%B5%D0%BA%D1%86%D0%B8%D1%8F%20%D0%90%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0%20%D0%B8%20%D0%BB%D0%BE%D0%B3%D0%B8%D0%BA%D0%B0":MAILTO:algebra_logic_seminar@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20220324T140000
DTEND;TZID=Europe/Sofia:20220324T153000
DTSTAMP:20260626T043953
CREATED:20220319T184701Z
LAST-MODIFIED:20220320T122816Z
UID:12057-1648130400-1648135800@math.bas.bg
SUMMARY:Семинар на секция "Математическо моделиране и числен анализ"
DESCRIPTION:На 24 март 2022 г. (четвъртък) от 14:00 часа ще се проведе семинар на секция “Математическо моделиране и числен анализ” в приложението Zoom. \nDr. habil. Clemens Hofreither ще представи доклад на тема \nA Newton’s method for best uniform rational approximation\nАбстракт. We present a novel algorithm\, inspired by the recent BRASIL algorithm\, for best uniform rational approximation based on a formulation of the problem as a nonlinear system of equations and barycentric interpolation. We derive a closed form for the Jacobian of the system of equations and formulate a Newton’s method for its solution. The resulting method for best uniform rational approximation can handle singularities and arbitrary degrees for numerator and denominator. It typically converges globally and exhibits superlinear convergence in a neighborhood of the solution.\nInteresting auxiliary results include formulae for the derivatives of barycentric rational interpolants with respect to the interpolation nodes\, and for the derivative of the nullspace of a full-rank matrix.\nThis talk is based on joint work with Irina Georgieva.\n\nTopic: семинар на секция “Математическо моделиране и числен анализ”\, Clemens Hofreither\nTime: Mar 24\, 2022 02:00 PM Sofia\n\nThe privacy policy\, terms of use\, and assistance can be found at\nhttps://help.jku.at/im/en/it-systeme/videokonferenz-mit-zoom\n\nJoin Zoom Meeting\nhttps://jku.zoom.us/j/94207785088?pwd=V05hV05Dd1lVZm9XM2dGZFA1bmRLZz09\nMeeting-ID: 942 0778 5088\nPassword: 729368\n  \n  \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-%d1%81%d0%b5%d0%ba%d1%86%d0%b8%d1%8f-%d0%bc%d0%b0%d1%82%d0%b5%d0%bc%d0%b0%d1%82%d0%b8%d1%87%d0%b5%d1%81%d0%ba%d0%be-%d0%bc%d0%be%d0%b4%d0%b5-12/
LOCATION:Zoom
CATEGORIES:Редовен семинар
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20220325T130000
DTEND;TZID=Europe/Sofia:20220325T143000
DTSTAMP:20260626T043953
CREATED:20220321T225239Z
LAST-MODIFIED:20220321T225239Z
UID:12068-1648213200-1648218600@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 25 март 2022 г. (петък) от 13:00 ч. ще се проведе дистанционно заседание на семинара по „Алгебра и логика”. \nДоклад на тема: \nAn Application of Separation in Discrete Time Interval Temporal Logic to Branching Time\nще изнесе Димитър Гелев (ИМИ – БАН). \nРезюме. In this talk we make an application of our separation theorem for discrete time Interval Temporal Logic (ITL) to the study of Interval-based Computation Tree Logic (ICTL*). We prove that the expressibility of the expanding modalities and\, most importantly\, propositional quantification\, carry over from linear time ITL to the branching time system of ICTL*. The relevance of this follows from the fact that point-based propositionally quantified CTL* (QCTL*) is the established intermediate language for temporal logics of agency as propositional quantification enables expressing the existence of strategies with given temporal properties. By moving to ITL we move a step further\, using the expressibility of propositional quantification in the logic\, which is markedly more expressive than point-based CTL* and facilitates the compositionality of specifications.\n  \nСеминарът ще се проведе посредством платформата Zoom и всеки желаещ може да се присъедини като последва линка: \nhttps://us02web.zoom.us/j/85137375021?pwd=RE5QczdFTE1xL1R6MnI2b1lkcGczQT09 \nTopic: Онлайн семинар на секция “Алгебра и логика”\nTime: Mar 25\, 2022 01:00 PM Sofia\nMeeting ID: 851 3737 5021\nPasscode: 035647 \nОт секция „Алгебра и логика” на ИМИ – БАН\nhttp://www.math.bas.bg/algebra/seminarAiL/\n============================== =====================
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%b0%d0%bb%d0%b3%d0%b5%d0%b1%d1%80%d0%b0-%d0%b8-%d0%bb%d0%be%d0%b3%d0%b8%d0%ba%d0%b0-74/
LOCATION:Zoom
CATEGORIES:Редовен семинар
ORGANIZER;CN="%D0%A1%D0%B5%D0%BA%D1%86%D0%B8%D1%8F%20%D0%90%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0%20%D0%B8%20%D0%BB%D0%BE%D0%B3%D0%B8%D0%BA%D0%B0":MAILTO:algebra_logic_seminar@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20220328T143000
DTEND;TZID=Europe/Sofia:20220328T160000
DTSTAMP:20260626T043953
CREATED:20220320T085910Z
LAST-MODIFIED:20220320T085910Z
UID:12062-1648477800-1648483200@math.bas.bg
SUMMARY:Семинар "Дидактическо моделиране"
DESCRIPTION:Поредната сбирка на семинара \nДидактическо моделиране\nще се проведе на 28.03.2022 г. от 14:30 ч. присъствено в зала 478 на ИМИ и дистанционно в Zoom. \nДоклад на тема \nЗа мястото на ученическото творчество в часовете по математика в 4. клас\nще изнесе \nас. Невена Събева. \nTime: Mar 28\, 2022 14:00 Sofia\nJoin Zoom Meeting\nhttps://us02web.zoom.us/j/87086998237?pwd=QmRNN1hRZU0rNlg2aGozbnhRNVgxQT09\nMeeting ID: 870 8699 8237  Passcode: 711085
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%b4%d0%b8%d0%b4%d0%b0%d0%ba%d1%82%d0%b8%d1%87%d0%b5%d1%81%d0%ba%d0%be-%d0%bc%d0%be%d0%b4%d0%b5%d0%bb%d0%b8%d1%80%d0%b0%d0%bd%d0%b5-19/
LOCATION:Zoom
CATEGORIES:Редовен семинар
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20220329T133000
DTEND;TZID=Europe/Sofia:20220329T150000
DTSTAMP:20260626T043953
CREATED:20220323T040444Z
LAST-MODIFIED:20220323T141131Z
UID:12074-1648560600-1648566000@math.bas.bg
SUMMARY:Общ семинар на секция "Анализ\, геометрия и топология"
DESCRIPTION:Поредното заседание на Общия семинар на секция “Анализ\, геометрия и топология” ще се проведе\nна 29 март 2022 г. от 13:30 часа в зала 478 на ИМИ – БАН.\nДоклад на тема: \nOn Squeezing Function for Planar Domains\n\nще изнесе Ahmed Yekta Ökten\, Institut de Mathématiques de Toulouse\, France. \nПоканват се всички интересуващи се. \nРезюме. Let Ω be a domain in ℂ𝑛 such that the set 𝐸(Ω\, 𝐵𝑛) of injective holomorphic maps from Ω into the unit ball 𝐵𝑛 ⊂ ℂ𝑛 is non-empty. The squeezing function of Ω\, denoted by 𝑆Ω is defined as \n𝑆Ω(𝑧) = sup{𝑟 ∈ (0\, 1): 𝑟𝐵𝑛 ⊂ 𝑓(Ω)\,      𝑓 ∈ 𝐸(Ω\, 𝐵𝑛)\,      𝑓 (𝑧) = 0}. \nIt follows from the definition that the squeezing function is biholomorphically invariant and roughly speaking\, it measures how much a domain looks like the unit ball looking at a fixed point. As expected\, the study of the squeezing function leads to nice results about the properties of the invariant metrics on complex domains. The behaviour of the squeezing function is well studied however very few non-trivial explicit formulas of squeezing functions have been found. \nIn this talk we will establish the explicit formulas of squeezing functions on doubly connected planar domains in an elementary way. With the same method we will also provide bounds to squeezing functions of higher connected domains. Finally\, we will conclude by mentioning other results and further questions about explicit formulas of squeezing functions on planar domains. \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%b8-11/
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:20220330T161500
DTEND;TZID=Europe/Sofia:20220330T173000
DTSTAMP:20260626T043953
CREATED:20220317T174844Z
LAST-MODIFIED:20220320T085453Z
UID:12054-1648656900-1648661400@math.bas.bg
SUMMARY:Национален колоквиум по математика
DESCRIPTION:СЪЮЗ НА МАТЕМАТИЦИТЕ В БЪЛГАРИЯ \nИНСТИТУТ ПО МАТЕМАТИКА И ИНФОРМАТИКА – БАН \n\nНАЦИОНАЛЕН КОЛОКВИУМ ПО МАТЕМАТИКА\nПоредната сбирка на Колоквиума ще се състои \nна 30 март 2022 г. (сряда) от 16:15 часа онлайн в Zoom: \nhttps://us02web.zoom.us/j/89769897829?pwd=MUEyOG9BbytSYjA3bCt6UEM5MlZ5Zz09 \nMeeting ID: 897 6989 7829               Passcode: 466950 \nДоклад на тема: \nАсимптотика на дисипативни собствени значения и приложения в проблеми на разсейване\nще изнесе проф. Веселин Петков\,\nИнститут по математика\, Университет на Бордо.\n \nАбстракт \n  \nПоканват са всички интересуващи се.
URL:https://math.bas.bg/event/%d0%bd%d0%b0%d1%86%d0%b8%d0%be%d0%bd%d0%b0%d0%bb%d0%b5%d0%bd-%d0%ba%d0%be%d0%bb%d0%be%d0%ba%d0%b2%d0%b8%d1%83%d0%bc-%d0%bf%d0%be-%d0%bc%d0%b0%d1%82%d0%b5%d0%bc%d0%b0%d1%82%d0%b8%d0%ba%d0%b0-22/
LOCATION:Zoom
CATEGORIES:Редовен семинар
ORGANIZER;CN="%D0%A1%D1%8A%D1%8E%D0%B7%20%D0%BD%D0%B0%20%D0%BC%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D1%86%D0%B8%D1%82%D0%B5%20%D0%B2%20%D0%91%D1%8A%D0%BB%D0%B3%D0%B0%D1%80%D0%B8%D1%8F":MAILTO:smb.sofia@gmail.com
END:VEVENT
END:VCALENDAR