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BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20210702T130000
DTEND;TZID=Europe/Sofia:20210702T143000
DTSTAMP:20210629T081650Z
CREATED:20210629T081650Z
LAST-MODIFIED:20210629T081650Z
UID:10825-1625230800-1625236200@math.bas.bg
SUMMARY:Семинар „Алгебра и логика”
DESCRIPTION:На 2 юли 2021 г. (петък) от 13:00 часа ще се проведе дистанционно заседание на семинара по „Алгебра и логика”. \nДоклад на тема \nNoncommutative Poisson structures\, Hochschild type complexes and Gröbner bases theory\nще изнесе Natalia Iyudu (Lancaster University\, UK). \n\nАбстракт: I will discuss Calabi-Yau type conditions\, such as pre-Calabi-Yau and exact Calabi-Yau. We show that pre-Calabi-Yau structures give rise to double Pois son brackets of Van den Bergh. The homological formulation of pre-Calabi-Yau structure can be dealt with using Gröbner bases theory to prove purity in case of free graph path algebras. \nThis technique is common for our study of such exact Calabi-Yau algebras as 3-Sklyanin. Here we are able\, for example\, to improve the statement in Artin-Schelter classical paper\, based on arguments of topological nature\, that there is a finite group action on Sklyanin algebras S_{p\,q}\, for which the orbits are exactly isomorphism classes. We can say that this group is SL_2(Z_3). \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: July 02\, 2021 13:00 PM Sofia\nMeeting ID: 851 3737 5021\nPasscode: 035647 \n\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%b0-57/
LOCATION:Zoom
CATEGORIES:Редовен семинар
ORGANIZER;CN="%D0%A1%D0%B5%D0%BA%D1%86%D0%B8%D1%8F %D0%90%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":MAILTO:algebra_logic_seminar@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20210709T130000
DTEND;TZID=Europe/Sofia:20210709T143000
DTSTAMP:20210705T214809Z
CREATED:20210705T214809Z
LAST-MODIFIED:20210705T214809Z
UID:10839-1625835600-1625841000@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 9 юли 2021 г. (петък) от 13:00 часа ще се проведе дистанционно заседание на семинара по „Алгебра и логика”. \nДоклад на тема \nThe mysterious Kronecker coefficients of the Symmetric group\nще изнесе Greta Panova (University of Southern California\, USA). \nАбстракт. Algebraic Combinatorics is a field of mathematics which studies discrete objects often originating in Representation Theory\, Algebra\, Algebraic Geometry\, Number Theory via combinatorial methods. One of its oldest problems concerns the Kronecker coefficients of the Symmetric Group. They are originally defined by Murnaghan more than 80 years ago as the multiplicities of the irreducible modules in the factorization of the tensor product of two other irreducible modules. They actually generalize the Littlewood-Richardson coefficients in the analogous problem for the general linear group. Despite their algebraic nature as nonnegative integers\, no combinatorial formula or interpretation is known. Kronecker coefficients have recently played a role in Computational Complexity Theory both as a problem and as a solution. \nIn this talk I will give a brief overview of the developments over the past 10 years. I will show how despite our very limited knowledge we can still use the Kronecker coefficients to solve other\, seemingly unrelated problems\, related to enumeration of integer partitions (Sylvester’s unimodality theorem). I will also discuss some of their computational complexity aspects. \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: July 09\, 2021 13:00 PM Sofia\nMeeting ID: 851 3737 5021\nPasscode: 035647 \n\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%b0-58/
LOCATION:Zoom
CATEGORIES:Редовен семинар
ORGANIZER;CN="%D0%A1%D0%B5%D0%BA%D1%86%D0%B8%D1%8F %D0%90%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":MAILTO:algebra_logic_seminar@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20210716T130000
DTEND;TZID=Europe/Sofia:20210716T143000
DTSTAMP:20210709T130952Z
CREATED:20210709T130952Z
LAST-MODIFIED:20210709T130952Z
UID:10856-1626440400-1626445800@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 16 юли 2021 г. (петък) от 13:00 часа ще се проведе дистанционно заседание на семинара по „Алгебра и логика”. \nДоклад на тема \nProof Complexity of Resolution over linear inequalities\nще изнесе Stefan Dantchev (Durham University\, United Kingdom). \nАбстракт. I will start by giving a brief and non-comprehensive introduction to the general research area\, Propositional Proof Complexity. \nI will then focus on a specific proof system that operates on linear inequalities with integral coefficients\, called Stabbing Planes (SP). Next\, a general method for proving depth lower bounds in SP will be introduced\, which allows us to prove logarithmic depth lower bounds for several well-studied propositional contradictions\, such as the Pigeon-Hole Principle and the Ordering Principle. Finally\, possible extensions and generalisations of SP will be discussed\, plus some open questions. \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: July 16\, 2021 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%b0-59/
LOCATION:Zoom
CATEGORIES:Редовен семинар
ORGANIZER;CN="%D0%A1%D0%B5%D0%BA%D1%86%D0%B8%D1%8F %D0%90%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":MAILTO:algebra_logic_seminar@math.bas.bg
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