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DTSTART;TZID=Europe/Sofia:20220513T130000
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DTSTAMP:20220506T154341Z
CREATED:20220506T154341Z
LAST-MODIFIED:20220506T154341Z
UID:12331-1652446800-1652452200@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 13 май 2022 г. (петък) от 13:00 ч. ще се проведе дистанционно заседание на семинара по „Алгебра и логика”. \nДоклад на тема: \nA counterexample to the modular isomorphism problem\n\nще изнесе Diego García-Lucas (Universidad de Murcia\, Spain). \n\nАбстракт. The modular isomorphism problem asks whether the isomorphism type of the modular group algebra of a p-group G over a field of characteristic p determines the isomorphism type of G. It was explicitly mentioned in a survey by Richard Brauer in 1963\, and was the only classical version of the isomorphism problem for group rings which had resisted a solution\, though it received considerable attention. Several partial positive solutions were obtained imposing very strong conditions on the group G\, for instance the one of being metacyclic. \nIn a joint work with Leo Margolis and Ángel del Río\, we solve the modular isomorphism problem in the negative by exhibiting a series of pairs of non-isomorphic 2-groups with isomorphic modular group algebras over every field of characteristic 2. These groups are two-generated with cyclic derived subgroup. We will also discuss the (lack of) possibility of obtaining\, in a naive way\, analogues to the counterexamples for p > 2 verifying this condition.\n\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: May 13\, 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%b0-78/
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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BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20220520T160000
DTEND;TZID=Europe/Sofia:20220520T173000
DTSTAMP:20220516T084953Z
CREATED:20220516T084953Z
LAST-MODIFIED:20220516T084953Z
UID:12365-1653062400-1653067800@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 20 май 2022 г. (петък) от 16:00 ч. ще се проведе дистанционно заседание на семинара по „Алгебра и логика”. \nДоклад на тема: \nBootstrap percolation: merging operations for polytopes\n\nще изнесе Ivailo Hartarsky (Université Paris-Dauhpine\, PSL\, France\,\nvisiting scholar at Instituto de Matemática Pura e Aplicada\, Rio de Janeiro\, Brazil). \n\nАбстракт. Bootstrap percolation is a group of statistical physics models intensively studied since the 1970s in mathematics\, physics\, computer science\, as well as social sciences. They are cellular automata generalising the following paradigmatic example. Arbitrarily declare some sites of Z^2 initially infected. Iteratively\, at each discrete-time round\, additionally infect each site with at least 2 infected neighbours. \nThe last decade has seen the accomplishment of a full classification of all such models into `universality classes’\, depending on their behavior when few sites are initially infected. In this talk\, we will overview universality results\, mostly in two dimensions. We will focus particularly on a key aspect of the proof of the lower bounds for the `critical’ class. Thаt is a natural polygon merging procedure to be discussed in detail. \nNo prerequisites (particularly in probability) are required\, as we will exclusively focus on the combinatorial side of the subject\, which is completely elementary. \n\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: May 20\, 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%b0-79/
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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