Journal of the Ramanujan Mathematical Society
Volume 29, Issue 4, December 2014 pp. 413–458.
Subtle invariants of F-crystals
Authors:
Xiao Xiao
Author institution:Mathematics Department, Utica College, 1600 Burrstone Road, Utica, NY 13502
Summary:
Vasiu proved that the level torsion lM of an
F-crystal M over an algebraically closed field of
characteristic p > 0 is a non-negative integer that is an
effectively computable upper bound of the isomorphism number
n M of M and expected that in fact one
always has nM = l M. In~this paper,
we prove that this equality holds.
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