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SUMMARY:Takahiro Oba
DTSTART:20211102T100000Z
DTEND:20211102T110000Z
DTSTAMP:20260423T053016Z
UID:Freemath/60
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Freemath/60/
 ">A four-dimensional mapping class group relation</a>\nby Takahiro Oba as 
 part of Free Mathematics Seminar\n\n\nAbstract\nRelations between Dehn twi
 sts on mapping class groups of surfaces play an important role in the stud
 y of symplectic manifolds via Lefschetz fibrations. In higher dimensions\,
  as little is known about symplectic mapping class groups\, fibration-like
  structures are not so powerful yet. In this talk\, I will give a relation
  between 4-dimensional Dehn twists on a Weinstein domain. One of the key i
 ngredients in the construction is a solution to the symplectic isotopy pro
 blem for symplectic surfaces in a Del Pezzo surface.\n
LOCATION:https://researchseminars.org/talk/Freemath/60/
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