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Note on tautological classes of moduli of K3 surfaces
Gerard van der Geer, Toshiyuki Katsura
We prove some cycle relations on moduli of K3 surfaces
An invariant for varieties in positive characteristic
G. van der Geer, T. Katsura
We introduce an invariant of varieties in positive characteristic which generalizes the a-number of an abelian variety. We calculate it in some examples and discuss its meaning for…
Formal Brauer groups and the moduli of abelian surfaces
G. van der Geer, T. Katsura
In this paper we consider the stratification on the moduli space of principally polarized abelian surfaces in characteristic defined by the height of the formal group associa…
On a Stratification of the Moduli of K3 Surfaces
G. van der Geer, T. Katsura
In this paper we give a characterization of the height of K3 surfaces in positive characteristic. This enables us to calculate the cycle classes of the loci in families of K3 surfa…