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X-WR-CALDESC:Events for Center for Complex Geometry
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TZID:Asia/Seoul
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TZOFFSETFROM:+0900
TZOFFSETTO:+0900
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DTSTART:20210101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20220324T150000
DTEND;TZID=Asia/Seoul:20220324T160000
DTSTAMP:20260615T012952
CREATED:20220324T060000Z
LAST-MODIFIED:20220314T062449Z
UID:1200-1648134000-1648137600@ccg.ibs.re.kr
SUMMARY:Yonghwa Cho\, Nodal Sextics and Even Sets of Nodes
DESCRIPTION:     Speaker\n\n\nYonghwa Cho\nIBS CCG\n\n\n\n\n\nIt is a classical question to ask how many nodes may a surface contain. For sextics\, the maximum number of nodes is 65\, and is attained by Barth’s example. We ask further: are all sextics with 65 nodes like Barth’s example? To find an answer\, we study even sets of nodes on sextic surfaces\, and prove that all sextics with 65 nodes share the same structure of even sets. This establishes a resemblance between Barth’s sextic and other sextics with 65 nodes. This talk is based on a joint work with Fabrizio Catanese\, Michael Kiermaier\, and Sascha Kurz.
URL:https://ccg.ibs.re.kr/event/2022-03-24-1500/
LOCATION:B234
CATEGORIES:Complex Geometry Seminar
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BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20220324T162000
DTEND;TZID=Asia/Seoul:20220324T172000
DTSTAMP:20260615T012952
CREATED:20220304T075827Z
LAST-MODIFIED:20220304T075827Z
UID:1197-1648138800-1648142400@ccg.ibs.re.kr
SUMMARY:Hoseob Seo\, On L2 Extension from Singular Hypersurfaces
DESCRIPTION:     Speaker\n\n\nHoseob Seo\nIBS CCG\n\n\n\n\n\nIn L2 extension theorems from an irreducible singular hypersurface in a complex manifold\, important roles are played by certain measures such as the Ohsawa measure\, which determines when a given function can be extended. In this talk\, we show that the singularity of the Ohsawa measure can be identified in terms of algebraic geometry.\nUsing this\, we give an analytic proof of the inversion of adjunction in this setting. These considerations enable us to compare various positive and negative results on L2 extension from singular hypersurfaces. In particular\, we generalize a recent negative result of Guan and Li which places limitations on strengthening such L2 extension by employing a less singular measure in the place of the Ohsawa measure. This is joint work with Dano Kim.
URL:https://ccg.ibs.re.kr/event/2022-03-24-1620/
LOCATION:B234
CATEGORIES:Complex Geometry Seminar
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