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SUMMARY:Tian-Jun Li (University of Minnesota)
DTSTART:20200714T160000Z
DTEND:20200714T170000Z
DTSTAMP:20260423T022627Z
UID:Geolis/9
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Geolis/9/">S
 ymplectic rational G-surfaces and the plane Cremona group</a>\nby Tian-Jun
  Li (University of Minnesota) as part of Geometria em Lisboa (IST)\n\n\nAb
 stract\nWe give characterizations of a finite group $G$ acting symplectica
 lly on a rational surface ($\\mathbb{CP}^2$ blown up at two or more points
 ). In particular\, we obtain a symplectic version of the dichotomy of $G$-
 conic bundles versus $G$-del Pezzo surfaces for the corresponding $G$-rati
 onal surfaces\, analogous to the one in algebraic geometry. The connection
  with the symplectic mapping class group will be mentioned.\n\n\nThis is a
  joint work with Weimin Chen and Weiwei Wu (and partly with Jun Li).\n
LOCATION:https://researchseminars.org/talk/Geolis/9/
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