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X-ORIGINAL-URL:https://dimag.ibs.re.kr
X-WR-CALDESC:Events for Discrete Mathematics Group
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TZID:Asia/Seoul
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TZOFFSETFROM:+0900
TZOFFSETTO:+0900
TZNAME:KST
DTSTART:20220101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230406T100000
DTEND;TZID=Asia/Seoul:20230406T110000
DTSTAMP:20260418T120935
CREATED:20230118T233830Z
LAST-MODIFIED:20240707T073746Z
UID:6691-1680775200-1680778800@dimag.ibs.re.kr
SUMMARY:Jie Han\, Spanning trees in expanders
DESCRIPTION:We consider the spanning tree embedding problem in dense graphs without bipartite holes and sparse graphs. In 2005\, Alon\, Krivelevich and Sudakov asked for determining the best possible spectral gap forcing an $(n\,d\,\lambda)$-graph to be $T(n\, \Delta)$-universal. In this talk\, we introduce our recent work on this conjecture.
URL:https://dimag.ibs.re.kr/event/2023-04-06/
LOCATION:Zoom ID: 224 221 2686 (ibsecopro)
CATEGORIES:Virtual Discrete Math Colloquium
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230419T163000
DTEND;TZID=Asia/Seoul:20230419T173000
DTSTAMP:20260418T120935
CREATED:20230301T064147Z
LAST-MODIFIED:20240705T165047Z
UID:6852-1681921800-1681925400@dimag.ibs.re.kr
SUMMARY:Shin-ichiro Seki\, On the extension of the Green-Tao theorem to number fields
DESCRIPTION:In 2006\, Tao established the Gaussian counterpart of the celebrated Green-Tao theorem on arithmetic progressions of primes. In this talk\, I will explain the extension of Tao’s theorem and the Green-Tao theorem to the case of general number fields. Our combinatorial tool is the relative hypergraph removal lemma by Conlon-Fox-Zhao. I will discuss the difficulties that arise in the case of general number fields and an application of our results to prime representations by binary quadratic forms. This is based on joint work with Wataru Kai\, Masato Mimura\, Akihiro Munemasa\, and Kiyoto Yoshino.
URL:https://dimag.ibs.re.kr/event/2023-04-19/
LOCATION:Zoom ID: 897 6822 0619 (ibsecopro) [04/19 only]
CATEGORIES:Virtual Discrete Math Colloquium
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