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제      목   l  ASARC Colloquium(Actions of finite groups on power series rings) 3월3일 PM 4:00
날      짜   l  2009-03-25 14:19:32
조 회  수   l  2239
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Ted Chinburg (University of Pennsylvania)

March 3, 4:00 PM

Title: Actions of finite groups on power series rings.

Abstract: It is an old problem to describe explicitly the ways in which a given finite group can act via ring automorphisms on a power series ring k[[t]] over a field k of characteristic p >0. I will focus in this talk on actions of finite cyclic p-groups. This is related to the algebraic geometry of Katz-Gabber covers of curves in characteristic p. The main result is a classification of Katz-Gabber covers with ``extra" automorphisms.