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X-WR-CALNAME:Institute of Mathematics and Informatics
X-ORIGINAL-URL:https://math.bas.bg
X-WR-CALDESC:Събития за Institute of Mathematics and Informatics
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TZID:Europe/Sofia
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TZOFFSETFROM:+0200
TZOFFSETTO:+0300
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DTSTART:20250330T010000
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DTSTART;TZID=Europe/Sofia:20250327T140000
DTEND;TZID=Europe/Sofia:20250327T153000
DTSTAMP:20260405T133439
CREATED:20250325T195400Z
LAST-MODIFIED:20250325T195400Z
UID:17514-1743084000-1743089400@math.bas.bg
SUMMARY:Семинар по Приложна математика
DESCRIPTION:About m-ary Gray codes\nДокладчик: д-р Мария Пашинска\, ИМИ – БАН\nДата: 27.03.2025 г.\nЧас: 14:00 ч.\nМясто: зала 503 \nРезюме: We present several systemized implementations of the Gray code over an alphabet with m ≥ 2 elements. Gray codes are widely used in digital communications and effective generation of combinatorial objects. We consider two variants – reflected and modular m-ary Gray codes. We present algorithms for their generation and other important functions such as ranking and unranking and functions for generation of a maximal set of non-proportional vectors of length n over the given alphabet. Some applications of the m-ary Gray codes are also considered. \nThis talk is based on joined work with Stefka Bouyuklieva \, Iliya Bouyukliev and Valentin Bakoev. \n 
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%bf%d0%be-%d0%bf%d1%80%d0%b8%d0%bb%d0%be%d0%b6%d0%bd%d0%b0-%d0%bc%d0%b0%d1%82%d0%b5%d0%bc%d0%b0%d1%82%d0%b8%d0%ba%d0%b0-13/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
ORGANIZER;CN="%D0%98%D0%BD%D1%81%D1%82%D0%B8%D1%82%D1%83%D1%82%20%D0%BF%D0%BE%20%D0%BC%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0%20%D0%B8%20%D0%B8%D0%BD%D1%84%D0%BE%D1%80%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0%20-%20%D0%91%D0%90%D0%9D":MAILTO:office@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20250603T150000
DTEND;TZID=Europe/Sofia:20250603T163000
DTSTAMP:20260405T133439
CREATED:20250530T121702Z
LAST-MODIFIED:20250530T121702Z
UID:17846-1748962800-1748968200@math.bas.bg
SUMMARY:Семинар по Приложна математика
DESCRIPTION:Следващата сбирка на Семинара по приложна математика ще се проведе на 03.06.2025 г. от 15:00 в онлайн среда:\nJoin Zoom Meeting\nhttps://us02web.zoom.us/j/87588684853?pwd=4xPgBSVfxBwjV4P8hrsHn2rN9gWQGB.1\nMeeting ID: 875 8868 4853\nPasscode: 711528\nA generalization of Meijer’s G function motivated by probability\nДокладчик: Dmitrii Karp \nРезюме: Meijer’s G function appeared in probability in 1930-ies even before Meijer’s work as the density of the product of independent beta variables and as the density of the likelihood ratio test for samples drawn from many classical probability distributions. It is defined by a contour integral of the appropriate ratio of gamma products (sometimes reducible to the inverse Mellin transform). Replacing the Euler gamma function by the Barnes double gamma function in this contour integral\, we introduce a new family of special functions which we call Mellin-Barnes’ K function. It is a quite general family which contains Meijer’s G function (thus also all classical hypergeometric functions pFq)\, as well as several new functions that appeared recently in the study of random processes and the fractional fenomena. For example\, the running supremum of an alpha-stable Levy process has density expressible by K function as well as does the exponential functionals of the hypergeometric process. In the talk\, we will discuss the definition of the new function\, its basic analytic and transformation properties and relations to the functions found in the literature. We further define a generalization of the Kilbas-Saigo function introduced earlier to solve in closed form certain classes of integral and differential equations of fractional order and observe that both the original and the generalized Kilbas-Saigo functions are special cases of our new function. \nThe talk is based on a joint work with Alexey Kuznetsov (York University\, Toronto\, Canada). \n 
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%bf%d0%be-%d0%bf%d1%80%d0%b8%d0%bb%d0%be%d0%b6%d0%bd%d0%b0-%d0%bc%d0%b0%d1%82%d0%b5%d0%bc%d0%b0%d1%82%d0%b8%d0%ba%d0%b0-14/
LOCATION:Zoom
CATEGORIES:Редовен семинар
ORGANIZER;CN="%D0%98%D0%BD%D1%81%D1%82%D0%B8%D1%82%D1%83%D1%82%20%D0%BF%D0%BE%20%D0%BC%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0%20%D0%B8%20%D0%B8%D0%BD%D1%84%D0%BE%D1%80%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0%20-%20%D0%91%D0%90%D0%9D":MAILTO:office@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20251210T150000
DTEND;TZID=Europe/Sofia:20251210T163000
DTSTAMP:20260405T133439
CREATED:20251205T143322Z
LAST-MODIFIED:20251205T143322Z
UID:18661-1765378800-1765384200@math.bas.bg
SUMMARY:Семинар по приложна математика
DESCRIPTION:Следващата сбирка на Семинара по приложна математика ще се проведе на 10 декември (сряда) от 15:00 в зала 503 на ИМИ-БАН. \nДокладчик: Giuseppe D’Onofrio (Politecnico di Torino\, Италия) \nЗаглавие: ADDITIVE SUBORDINATION OF MULTIPARAMETER MARKOV PROCESSES \nРезюме: In this talk\, we consider multiparameter multidimensional Markov processes that are time-changed by an independent additive subordinator\, obtained from a Lévy process by relaxing the condition of stationary increments. By extending Phillips theorem\, we show that the resulting process is a Feller evolution and we characterize its generator. We further derive its pseudo-differential representation and show that its symbol admits a Lévy-Khintchine representation. As an application\, we consider a factor-based specification for the Ornstein-Uhlenbeck process subordinated by a Sato process. The constructive nature of this process is inspired by applications in finance which will be briefly discussed.
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%bf%d0%be-%d0%bf%d1%80%d0%b8%d0%bb%d0%be%d0%b6%d0%bd%d0%b0-%d0%bc%d0%b0%d1%82%d0%b5%d0%bc%d0%b0%d1%82%d0%b8%d0%ba%d0%b0-17/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
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