Subtle Invariants of F-crystals
Xiao, Xiao
Original · EN
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 nₘ of M and expected that in fact one always has nₘ = ℓₘ. In this paper, we prove that this equality holds.
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