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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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TZID:Asia/Seoul
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TZOFFSETFROM:+0900
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DTSTART:20220101T000000
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BEGIN:VEVENT
DTSTART;VALUE=DATE:20230227
DTEND;VALUE=DATE:20230301
DTSTAMP:20260502T233005
CREATED:20230127T105023Z
LAST-MODIFIED:20230213T044029Z
UID:2034-1677456000-1677628799@ccg.ibs.re.kr
SUMMARY:Seminars on Algebraic Surfaces and Related Topics
DESCRIPTION:     Schedule\n\n\nFeb. 27 \n\n\n\n\n\nN-resolutions\nGiancarlo Urzua (UC Chille)\n13:30-14:20 \n\n\nSmooth Projective Surfaces with Pseudo-effective Tangent Bundles\nGuolei Zhong (IBS-CCG)\n14:40-15:30 \n\n\nNodal Surfaces and Cubic Discriminants\nYonghwa Cho (IBS-CCG)\n15:50-16:40 \n\n\nLagrangian Fibration Structure on the Cotangent Bundle of a Del Pezzo Surface of Degree 4\nHosung Kim (IBS-CCG)\n17:00-17:50 \n\n\nDinner\n18:20-20:00\n\n\n\n\n\nFeb. 28 \n\n\n\n\n\nDeformations of Sandwiched Surface Singularities and the Minimal Model Program\nDongsoo Shin (Chungnam National U.)\n10:00-10:50 \n\n\nMori Dream Surfaces of General Type with pg=0\nJongHae Keum (KIAS)\n11:10-12:00 \n\n\nLunch\n12:00-13:00
URL:https://ccg.ibs.re.kr/event/2023-02-27-28/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Conferences and Workshops
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BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20230227T133000
DTEND;TZID=Asia/Seoul:20230227T142000
DTSTAMP:20260502T233005
CREATED:20230212T130036Z
LAST-MODIFIED:20230212T130036Z
UID:2059-1677504600-1677507600@ccg.ibs.re.kr
SUMMARY:Giancarlo Urzua\, N-resolutions
DESCRIPTION:     Speaker\n\n\nGiancarlo Urzua\nUC Chille\n\n\n\n\n\n\n(This is a part of Seminars on Algebraic Surfaces and Related Topics.) \nI will introduce N-resolutions\, which are the negative analog of the Kollár–Shepherd-Barron (1988) P-resolutions of a 2-dimensional cyclic quotient singularity. (We instead work with the corresponding M-resolutions of Benkhe-Christophersen (1994).) I will start by describing an algorithm to find all of them based on the explicit algorithm for P-resolutions in Park-Park-Shin-Urzúa (2018) (that geometrically recovers Christophersen-Stevens’ zero continued fractions correspondence (1991))\, which in turn is based on the explicit MMP described by Hacking-Tevelev-Urzúa (HTU 2017). I will also describe another way to find N-resolutions via antiflips (HTU 2017) starting with an M-resolution\, showing an action of the braid group on all its associated Wahl resolutions. This will bring us to Hacking exceptional collections (2013-2016) on surfaces that are Q-Gorenstein smoothings of particular singular surfaces\, where Karmazyn-Kuznetsov-Shinder (2022) have described their derived categories via derived categories of the Kalck-Karmazyn algebras (2017). This can be put together through Kawamata’s bundles (2018-2022)\, and I will describe our main theorem on semi-orthogonal decompositions defined by these M- and N-resolutions. I will end with applications to all simply-connected Dolgachev surfaces. I will mention open problems. This is on the joint recent work with Jenia Tevelev. This computer program finds all M- and N-resolutions.
URL:https://ccg.ibs.re.kr/event/2023-02-27-1330-1420/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
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