New York Journal of Mathematics
Volume 4 (1998) 127-136


Alan Koch

Lifting Witt Subgroups to Characteristic Zero

Published: August 31, 1998
Keywords: Group Schemes, Dieudonné Modules, Witt Vectors
Subject: 14L

Let k be a perfect field of characteristic p>0. Using Dieudonné modules, we describe the exact conditions under which a Witt subgroup, i.e., a finite subgroup scheme of Wn, lifts to the ring of Witt Vectors W(k).

Author information

Department of Mathematics, Hope College, P.O. Box 9000, Holland, MI 49424-9000
Current Address: Department of Mathematics, St. Edward's University, 3001 S. Congress Ave., Austin, TX 78704-6489