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X-WR-CALNAME:Center for Complex Geometry
X-ORIGINAL-URL:https://ccg.ibs.re.kr
X-WR-CALDESC:Events for Center for Complex Geometry
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BEGIN:VTIMEZONE
TZID:Asia/Seoul
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TZOFFSETFROM:+0900
TZOFFSETTO:+0900
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DTSTART:20230101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240513T143000
DTEND;TZID=Asia/Seoul:20240513T153000
DTSTAMP:20260416T143214
CREATED:20240308T031601Z
LAST-MODIFIED:20240422T004325Z
UID:3009-1715610600-1715614200@ccg.ibs.re.kr
SUMMARY:Hsueh-Yung Lin\, Motivic Invariants of Birational Automorphisms of Threefolds
DESCRIPTION:    Speaker\n\n\nHsueh-Yung Lin\nNational Taiwan University\n\n\n\n\n\n\nThe motivic invariant c(f) of a birational automorphism f : X – → X measures the difference between the birational types of the exceptional divisors of f and those of the inverse f-1. In general c(f) is nonzero: this is the case when f is some Cremona transformation\, which leads to new explanation as to why Cremona groups are not simple. In the other direction\, which will be the main focus of the talk\, we show that the invariant c(f) always vanishes when X is a complex projective threefold. (joint work in progress with E. Shinder.)
URL:https://ccg.ibs.re.kr/event/2024-0513-1430-1530/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
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BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240513T160000
DTEND;TZID=Asia/Seoul:20240513T170000
DTSTAMP:20260416T143214
CREATED:20240308T031735Z
LAST-MODIFIED:20240420T084747Z
UID:3011-1715616000-1715619600@ccg.ibs.re.kr
SUMMARY:Ching-Jui Lai\, Anticanonical Volume of Singular Fano Threefolds
DESCRIPTION:    Speaker\n\n\nChing-Jui Lai\nNational Cheung Kung University\n\n\n\n\n\n\nThe set of canonical Fano threefolds form a bounded family by results of Kawamata\, Mori-Miyaoka-Kollar-Tagaki\, and in a much more general setting by Birkar. In particular\, the anticaonical volume –KX3 is bounded. An optimal lower bound is 1/330 by the work of Chen-Chen. In this talk\, we discuss the problem of identifying an optimal upper bound of –KX3.
URL:https://ccg.ibs.re.kr/event/2024-0513-1600-1700/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
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