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PRODID:-//Discrete Mathematics Group - ECPv6.18.1//NONSGML v1.0//EN
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METHOD:PUBLISH
X-ORIGINAL-URL:https://dimag.ibs.re.kr
X-WR-CALDESC:Events for Discrete Mathematics Group
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X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Asia/Seoul
BEGIN:STANDARD
TZOFFSETFROM:+0900
TZOFFSETTO:+0900
TZNAME:KST
DTSTART:20250101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20261103T163000
DTEND;TZID=Asia/Seoul:20261103T173000
DTSTAMP:20261014T053147Z
CREATED:20261014T053147Z
LAST-MODIFIED:20261014T053147Z
UID:13624-1793723400-1793727000@dimag.ibs.re.kr
SUMMARY:Hikaru Yokoi\, TBA
DESCRIPTION:TBA
URL:https://dimag.ibs.re.kr/event/2026-11-03/
LOCATION:Room B332\, IBS (기초과학연구원)
CATEGORIES:Discrete Math Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20261117T163000
DTEND;TZID=Asia/Seoul:20261117T173000
DTSTAMP:20261012T112738Z
CREATED:20261012T112738Z
LAST-MODIFIED:20261012T112738Z
UID:13607-1794933000-1794936600@dimag.ibs.re.kr
SUMMARY:Joonkyung Lee (이준경)\, TBA
DESCRIPTION:TBA
URL:https://dimag.ibs.re.kr/event/2026-11-17/
LOCATION:Room B332\, IBS (기초과학연구원)
CATEGORIES:Discrete Math Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20261201T163000
DTEND;TZID=Asia/Seoul:20261201T173000
DTSTAMP:20261012T113621Z
CREATED:20261012T113621Z
LAST-MODIFIED:20261012T113621Z
UID:13611-1796142600-1796146200@dimag.ibs.re.kr
SUMMARY:William J. Wesley\, An elementary solution to the 2-color Pythagorean triples problem
DESCRIPTION:In the 1980s\, Ron Graham asked whether every red/blue coloring of the positive integers contains a monochromatic Pythagorean triple and offered a $100 prize for the answer. The bounty was claimed in 2016 by Heule\, Kullmann\, and Marek\, who showed that every such coloring of [1\,7825] has a monochromatic triple. Their proof used SAT solvers and took over 50\,000 CPU hours to produce and verify. In this talk we will present an elementary solution to Graham’s problem that requires neither deep analytic arguments nor extensive computation.
URL:https://dimag.ibs.re.kr/event/2026-12-01/
LOCATION:Room B332\, IBS (기초과학연구원)
CATEGORIES:Discrete Math Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20261208T163000
DTEND;TZID=Asia/Seoul:20261208T173000
DTSTAMP:20261014T024439Z
CREATED:20261014T024439Z
LAST-MODIFIED:20261014T024439Z
UID:13619-1796747400-1796751000@dimag.ibs.re.kr
SUMMARY:Mingyuan Rong\, The codegree Turán density of tight cycles
DESCRIPTION:The codegree Turán density γ(F) of a k-uniform hypergraph F is the smallest γ ≥ 0 with the following property: if every set of k−1 vertices in an n-vertex k-uniform hypergraph H lies in at least (γ+o(1))n edges\, then H contains a copy of F for all sufficiently large n. Piga\, Sanhueza-Matamala\, and Schacht proved that this density is 1/3 for all sufficiently long 3-uniform tight cycles whose lengths are not divisible by 3. In this talk\, I will discuss extensions of this result to higher uniformities\, where we determine the codegree Turán density of tight cycles for a broad range of cycle lengths. I will explain the structural characterization underlying the upper bounds and the constructions used for the lower bounds. This is joint work with Jie Ma.
URL:https://dimag.ibs.re.kr/event/2026-12-08/
LOCATION:Room B332\, IBS (기초과학연구원)
CATEGORIES:Discrete Math Seminar
END:VEVENT
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