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DTSTART:20070311T020000
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BEGIN:VEVENT
DTSTAMP:20261113T221701
DTSTART;TZID=America/Detroit:20261118T160000
DTEND;TZID=America/Detroit:20261118T172000
SUMMARY:Workshop / Seminar:RTG GEOMETRY\, TOPOLOGY\, DYNAMICS    On isomorphism classes of (topological) Lefschetz pencils on ruled surfaces
DESCRIPTION:Lefschetz pencils\, originally discovered by Lefschetz in the context of algebraic varieties\, were later shown to be intimately related to symplectic manifolds by work of Donaldson and Gompf. In fact\, we have a correspondence: Every symplectic 4-manifold admits a Lefschetz pencil and the total space of every such pencil is symplectic. Nonetheless\, this correspondence is not canonical. A natural question is then the following: Given a fixed symplectic manifold\, does it admit more than one (inequivalent) Lefschetz pencil of fixed genus? How about infinitely many? In this talk we will discuss these questions in the context of Ruled surfaces. In particular\, we will show that for any ruled surface of negative euler characteristic the answer to both questions is Yes. This is joint work with Seraphina Lee.
UID:154823-21918390@events.umich.edu
URL:https://events.umich.edu/event/154823
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - EH 3866
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20261019T095302
DTSTART;TZID=America/Detroit:20261202T160000
DTEND;TZID=America/Detroit:20261202T170000
SUMMARY:Workshop / Seminar:Geometry-Topology RTG Seminar: TBA
DESCRIPTION:Abstract: TBA
UID:153805-21916374@events.umich.edu
URL:https://events.umich.edu/event/153805
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 3866
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261111T203951
DTSTART;TZID=America/Detroit:20261209T160000
DTEND;TZID=America/Detroit:20261209T170000
SUMMARY:Workshop / Seminar:Geometry-Topology RTG Seminar: TBA
DESCRIPTION:Abstract: TBA
UID:154832-21918397@events.umich.edu
URL:https://events.umich.edu/event/154832
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 3866
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260805T221806
DTSTART;TZID=America/Detroit:20270210T160000
DTEND;TZID=America/Detroit:20270210T172000
SUMMARY:Workshop / Seminar:RTG GEOMETRY\, TOPOLOGY\, DYNAMICS   TBA
DESCRIPTION:TBA
UID:149946-21907414@events.umich.edu
URL:https://events.umich.edu/event/149946
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 3866
CONTACT:
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