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TZID:Asia/Seoul
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TZOFFSETFROM:+0900
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DTSTART:20250101T000000
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DTSTART;TZID=Asia/Seoul:20260904T163000
DTEND;TZID=Asia/Seoul:20260904T173000
DTSTAMP:20260807T054718Z
CREATED:20260807T054718Z
LAST-MODIFIED:20260807T054718Z
UID:4675-1788539400-1788543000@ccg.ibs.re.kr
SUMMARY:Models for elliptic surfaces with a bisection
DESCRIPTION:    Speaker\n\n\nSönke Rollenske\nMarburg University\n\n\n\n\n\n\nIn the study of (relatively minimal) elliptic surfaces $f\colon S \to C$ with a section\, the Weierstrass model plays an important role. We discuss two different models for elliptic surfaces with a bisection (or more generally an $f$-nef divisor which has degree two on the fibres): a birational model induced by the involution on the general fibre and a relative determinantal model coming from the relative section ring. The presence of multiple fibres gives rise to new phenomena\, which will be illustrated for Enriques surfaces or rational elliptic surfaces. (joint work with Anna Ulivi and Aline Zanardini)
URL:https://ccg.ibs.re.kr/event/models-for-elliptic-surfaces-with-a-bisection/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
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