BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Institute of Mathematics and Informatics - ECPv6.16.5.1//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:20200329T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0300
TZOFFSETTO:+0200
TZNAME:EET
DTSTART:20201025T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0200
TZOFFSETTO:+0300
TZNAME:EEST
DTSTART:20210328T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0300
TZOFFSETTO:+0200
TZNAME:EET
DTSTART:20211031T010000
END:STANDARD
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:20210604T130000
DTEND;TZID=Europe/Sofia:20210604T143000
DTSTAMP:20210530T130306Z
CREATED:20210530T130306Z
LAST-MODIFIED:20210530T130306Z
UID:10700-1622811600-1622817000@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 4 юни 2021 г. (петък) от 13:00 часа ще се проведе дистанционно заседание на семинара “Алгебра и логика”. \nДоклад на тема \nSchur’s exponent conjecture\nще изнесе Michael Vaughan-Lee (Oxford University Mathematical Institute\, United Kingdom). \nРезюме. If G is a finite group and we write G = F/R where F is a free group\, then the Schur multiplier M(G) is (R \cap F’)/[R\, F]. \nThere is a long-standing conjecture attributed to I. Schur that the exponent of M(G) divides the exponent of G. It is easy to show that this is true for groups G of exponent 2 or exponent 3\, but it has been known since 1974 that the conjecture fails for exponent 4. However the truth or otherwise of this conjecture has remained open up till now for groups of odd exponent.\n\nIn my talk I describe counterexamples to the conjecture of exponent 5 and exponent 9.\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: June 04\, 2021 01:00 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%b0-53/
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:20210611T130000
DTEND;TZID=Europe/Sofia:20210611T143000
DTSTAMP:20210607T145727Z
CREATED:20210607T145727Z
LAST-MODIFIED:20210607T145727Z
UID:10710-1623416400-1623421800@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 11 юни 2021 г. (петък) от 13:00 часа ще се проведе дистанционно заседание на семинара “Алгебра и логика”. \nДоклад на тема \nDistinctness of the “lifted” Kloosterman sums over the prime field F_p\nще изнесе Любомир Борисов. \nРезюме  \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: June 11\, 2021 01:00 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%b0-54/
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:20210618T130000
DTEND;TZID=Europe/Sofia:20210618T143000
DTSTAMP:20210611T154058Z
CREATED:20210611T153200Z
LAST-MODIFIED:20210611T154058Z
UID:10732-1624021200-1624026600@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 18 юни 2021 г. (петък) от 13:00 часа ще се проведе дистанционно заседание на семинара “Алгебра и логика”. \nДоклад на тема \nPrimary decompositions of unital locally matrix algebras and Steinitz numbers\nще изнесе Bogdana Oliynik (National University of Kyiv-Mohyla Academy\, Kyiv\, Ukraine). \nРезюме. Let F be a ground field. An F-algebra A with unit 1 is said to be a locally matrix algebra if an arbitrary finite collection of elements a1\, . . . \, as from A lies in a subalgebra B with 1 of the algebra A\, and B is isomorphic to a matrix algebra Mn(F)\, n ≥. We assign a Steinitz number n(A) to an arbitrary unital locally matrix algebra A. In this talk\, we outline the construction of a unital locally matrix algebra of uncountable dimension that does not admit a primary de-composition. It gives negative answers to the question posed in V. M. Kurochkin\, On the theory of locally simple and locally normal algebras (Russian)\, Mat. Sb.\, Nov. Ser. 22(64) (1948)\, no. 3\, 443–454. We also show that for an arbitrary infinite Steinitz number s there exists a unital locally matrix algebra A having the Steinitz number s and being not isomorphic to a tensor product of finite dimensional matrix algebras. \nThis talk is based on the joint works with Oksana Bezushchak. \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: June 18\, 2021 01:00 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%b0-55/
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:20210625T110000
DTEND;TZID=Europe/Sofia:20210625T123000
DTSTAMP:20210622T110357Z
CREATED:20210622T110357Z
LAST-MODIFIED:20210622T110357Z
UID:10789-1624618800-1624624200@math.bas.bg
SUMMARY:Семинар "Алгебра и логика"
DESCRIPTION:На 25 юни 2021 г. (петък) от 11:00 часа ще се проведе дистанционно заседание на семинара по „Алгебра и логика”. \nДоклад на тема \nFraming in secret sharing \nще изнесе Arkadii Slinko (The University of Auckland\, New Zealand). \nАбстракт. Secret sharing\, a well-known cryptographic technique\, introduced 40 years ago as a private and reliable variant of classical storage\, has now become a major cryptographic primitive with numerous real-world applications. \nIn this paper we consider the digital forensics aspects of secret sharing. We investigate the problem of framing which occurs when a coalition of participants is able to calculate the share of a participant who does not belong to it. In the extreme case one authorized coalition can calculate shares of another authorized coalition\, obtain the secret and use it in some way blaming another authorized coalition for their action. Our work shows that in an ideal secret sharing scheme an authorized coalition cannot frame participants who are less senior than all members of the coalition and is able to frame a participant who is more senior than at least one member of the coalition. \nThis is a joint paper with Yvo Desmedt and Songbao Mo. It has just been published in \nDesmedt\, Y.\, Mo\, S.\, & Slinko\, A. M. (2021). Framing in Secret Sharing. IEEE Transactions on Information Forensics and Security\, 16\, 2836-2842. \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: June 25\, 2021 11:00 AM SofiaЍ\nMeeting ID: 851 3737 5021\nPasscode: 035647 \n\nОт секция „Алгебра и логика” на ИМИ – БАН\nhttp://www.math.bas.bg/algebra/seminarAiL/
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%b0-56/
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
END:VCALENDAR