On elements of order p^s in the plane Cremona group over a field of characteristic p
Abstract
Description
We show that the plane Cremona group over a field of characteristic p > 0 does not contain elements of order of power of p larger than 2 and it does not contain elements of order p^2 unless p =2. Also we describe conjugacy classes of elements of order 4.
10 pages,minor corrections, to appear in Proc. Steklov Inst. of Math., v. 264, 2009, 1--8
10 pages,minor corrections, to appear in Proc. Steklov Inst. of Math., v. 264, 2009, 1--8