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math.NT2018
Dimensions of automorphism group schemes of finite level truncations of -cyclic -crystals
Zeyu Ding, Xiao Xiao
Let be an -cyclic -crystal over an algebraically closed field defined by a permutation and a set of prescribed Hodge slopes. We prove comb…
math.NT2015
Minimal -crystals and isomorphism numbers of isosimple -crystals
Xiao Xiao
In this paper we generalize minimal -divisible groups defined by Oort to -crystal over an algebraically closed field of positive characteristic. We prove a structural theorem…
math.NT2013★ 3 cited
Subtle Invariants of -crystals
Xiao Xiao
Vasiu proved that the level torsion of an -crystal over an algebraically closed field of characteristic is a non-negative integer that i…
math.NT2011★ 1 cited
Computing isomorphism numbers of F-crystals by using level torsions
Xiao Xiao
The isomorphism number of an -crystal over an algebraically closed field of positive characteristic is the smallest non-negative integer such that the -th le…