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DTSTART;TZID=Europe/Sofia:20220701T130000
DTEND;TZID=Europe/Sofia:20220701T143000
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CREATED:20220628T173544Z
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UID:12586-1656680400-1656685800@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 1 юли 2022 г. (петък) от 13:00 ч. ще се проведе дистанционно заседание на семинара по „Алгебра и логика”. \nДоклад на тема: \nOn the parity of the coefficients of minimal polynomial of Kloosterman sums over Fp\nще изнесе Любомир Борисов. \n\nАбстракт. Kloosterman sums over finite fields play an important role in “Algebraic Coding Theory” and “Cryptography”. E.g.\, they are related to some families of algebraic codes (Melas\, Kloosterman) and (hyper-)bent functions. Particularly\, the divisibility properties of some quantities connected with the Kloosterman sums\, e.g.\, of minimal polynomial coefficients and power moments\, were also investigated (see\, e.g.\, [1]; [2]). \nIn this talk I shall present some results about the divisibility by 2 of the coefficients of minimal polynomials of the Kloosterman sums.\n\n[1] M. Moisio\, “On certain values of Kloosterman sums”\, IEEE IT\, vol. 55.8 (2009)\, 3563-3564.\n[2] Choi H. T.\, R. Evans\, “Congruences for Sums of Powers of Kloosterman Sums”\, International Journal of Number Theory\, vol. 3(1): 105-117\, 2007.\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: July 1\, 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%b0-82/
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:20220729T130000
DTEND;TZID=Europe/Sofia:20220729T143000
DTSTAMP:20220722T183455Z
CREATED:20220722T183455Z
LAST-MODIFIED:20220722T183455Z
UID:12721-1659099600-1659105000@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 29 юли 2022 г. (петък) от 13:00 ч. ще се проведе дистанционно заседание на семинара по „Алгебра и логика”. \nДоклад на тема: \nModal Descriptive Complexity\nще изнесе Петър Илиев (ИФС-БАН и ИМИ-БАН). \n\nАбстракт. The study of the descriptive complexity of a class of structures S relative to a class of formulae F from a logic L revolves around the question: what can we say about the definability of S with formulae from F? For example\, we might want to know whether there is a formula from F defining S or\, if not\, whether there is a countably infinite sequence of F-formulae such that each formula from the sequence defines a subset of S and the union of all these subsets is the whole S. If we have the former situation\, it is natural to ask about the minimal number of variables in any F-formula defining S\, or its minimal length\, or the minimal number of operators like quantifiers\, disjunctions and conjunctions\, and the minimal depth of their nesting. In the latter situation\, we might want to know how (some of) these measures scale with the index of individual formulae. \nIn my talk\, I am going to survey several recent results\, in some of which I have been involved\, coming from the area of the descriptive complexity of classes of Kripke frames (directed graphs) and classes of Kripke models (edge-and vertex-coloured directed graphs) relative to some well-known modal logics. \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: July 29\, 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%b0-83/
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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