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On a stratification of the moduli of K3 surfaces

Gerard van der GeerT. Katsura — 2000

Journal of the European Mathematical Society

In this paper we give a characterization of the height of K3 surfaces in characteristic p > 0 . This enables us to calculate the cycle classes in families of K3 surfaces of the loci where the height is at least h . The formulas for such loci can be seen as generalizations of the famous formula of Deuring for the number of supersingular elliptic curves in characteristic p . In order to describe the tangent spaces to these loci we study the first cohomology of higher closed forms.

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