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PRODID:-//Center for Complex Geometry - ECPv6.15.20//NONSGML v1.0//EN
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METHOD:PUBLISH
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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X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Asia/Seoul
BEGIN:STANDARD
TZOFFSETFROM:+0900
TZOFFSETTO:+0900
TZNAME:KST
DTSTART:20230101T000000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;VALUE=DATE:20241013
DTEND;VALUE=DATE:20241015
DTSTAMP:20260416T000250
CREATED:20240930T082712Z
LAST-MODIFIED:20240930T082712Z
UID:3359-1728777600-1728950399@ccg.ibs.re.kr
SUMMARY:Changho Han (한창호\, Korea University)
DESCRIPTION:Changho Han (한창호) \nVisitor (2024.10.13-2024.10.14) from Korea University \nOffice: –
URL:https://ccg.ibs.re.kr/event/changho-han-241013-241014/
CATEGORIES:Visitors
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20241014T160000
DTEND;TZID=Asia/Seoul:20241014T170000
DTSTAMP:20260416T000250
CREATED:20240930T081445Z
LAST-MODIFIED:20241007T061046Z
UID:3348-1728921600-1728925200@ccg.ibs.re.kr
SUMMARY:Changho Han\, Trigonal Curves and Associated K3 Surfaces
DESCRIPTION:    Speaker\n\n\nChangho Han\nKorea university\n\n\n\n\n\n\nK3 surfaces\, as a generalization of elliptic curves\, have a rich amount of geometric properties. Recalling that elliptic curves are double covers of rational curves branched over 4 distinct points\, there are K3 surfaces that are cyclic triple covers of rational surfaces; Artebani and Sarti classified such generic K3 surfaces depending on lattice invariants. Such K3 surfaces admit Kulikov and KSBA degenerations\, each leading to toroidal and KSBA compactifications of the moduli spaces of such K3 surfaces. As joint works in progress with Valery Alexeev\, Anand Deopurkar\, and Philip Engel\, I will explain how to use trigonal curves (triple covers of rational curves) to obtain aforementioned degenerations\, leading to more explicit understandings of boundaries of those compactifications: such as classifications of generic members and the dimensions.
URL:https://ccg.ibs.re.kr/event/2024-1014/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20241015T140000
DTEND;TZID=Asia/Seoul:20241015T150000
DTSTAMP:20260416T000250
CREATED:20240930T081700Z
LAST-MODIFIED:20241007T061212Z
UID:3350-1729000800-1729004400@ccg.ibs.re.kr
SUMMARY:Justin Lacini\, On Log del Pezzo Surfaces in Positive Characteristic
DESCRIPTION:    Speaker\n\n\nJustin Lacini\nPrinceton university\n\n\n\n\n\n\nA log del Pezzo surface is a normal surface with only Kawamata log terminal singularities and anti-ample canonical class. Over the complex numbers\, Keel and McKernan have classified all but a bounded family of log del Pezzo surfaces of Picard number one. In this talk we will extend their classification to positive characteristic. In particular\, we will prove that for p>3 every log del Pezzo surface of Picard number one admits a log resolution that lifts to characteristic zero over a smooth base. As a consequence\, we will see that Kawamata-Viehweg vanishing holds in this setting. Finally\, we will conclude with some counterexamples in characteristic two\, three and five.
URL:https://ccg.ibs.re.kr/event/2024-1015/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20241022T160000
DTEND;TZID=Asia/Seoul:20241022T170000
DTSTAMP:20260416T000250
CREATED:20241017T051012Z
LAST-MODIFIED:20241017T051012Z
UID:3397-1729612800-1729616400@ccg.ibs.re.kr
SUMMARY:David Sykes\, CR Hypersurfaces\, Studying 2-nondegenerate Structures via Absolute Parallelisms
DESCRIPTION:    Speaker\n\n\nDavid Sykes\nIBS CCG\n\n\n\n\n\n\nThe basic problem of finding (local) biholomorphisms mapping one real hypersurface in a complex space onto another is only well understood for a limited class of hypersurfaces\, and has a fundamental relationship to their induced CR geometries. Following a light historical survey of major results in the area\, this talk will present a solution to the local equivalence problem for 2-nondegenerate CR hypersurfaces\, developed in joint work with Igor Zelenko\, given by canonically encoding the geometries into absolute parallelisms.
URL:https://ccg.ibs.re.kr/event/2024-1022/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Several Complex Variables Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20241026
DTEND;VALUE=DATE:20241030
DTSTAMP:20260416T000250
CREATED:20240930T083008Z
LAST-MODIFIED:20241014T060511Z
UID:3364-1729900800-1730246399@ccg.ibs.re.kr
SUMMARY:Naoto Yotsutani (Kagawa University)
DESCRIPTION:Naoto Yotsutani \nVisitor (2024.10.26-2024.10.29) from Kagawa University \nOffice: –
URL:https://ccg.ibs.re.kr/event/naoto-yotsutani-241026-241029/
CATEGORIES:Visitors
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20241029T160000
DTEND;TZID=Asia/Seoul:20241029T170000
DTSTAMP:20260416T000250
CREATED:20240930T081825Z
LAST-MODIFIED:20241014T060435Z
UID:3353-1730217600-1730221200@ccg.ibs.re.kr
SUMMARY:Naoto Yotsutani\, Bott Manifolds with the Strong Calabi Dream Structure
DESCRIPTION:    Speaker\n\n\nNaoto Yotsutani\nKagawa university\n\n\n\n\n\n\nWe prove that if the Futaki invariant of a polarized Bott manifold (X\, L) for any ample line bundle L vanishes\, then X is isomorphic to the products of the projective lines. This talk is based on a work joint with Kento Fujita (algebro-geometrical approach)\, and another independent work joint with Hajime Ono and Yuji Sano (convex geometrical approach).
URL:https://ccg.ibs.re.kr/event/2024-1029/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
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