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Authors
Affiliations
1 Mathematics Department, Utica College, 1600 Burrstone Road, Utica, NY 13502, US
Source
Journal of the Ramanujan Mathematical Society, Vol 29, No 4 (2014), Pagination: 413–458
Abstract
Vasiu proved that the level torsion ιM 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 nM of M and expected that in fact one always has nM = ιM. In this paper, we prove that this equality holds.