2 citations · 4 across the 6 of their papers we have counts for
Showing 1999Show all
3 papers · 1 filter
math.AG1999
The Moduli Space of Abelian Varieties and the Singularities of the Theta Divisor
Ciro Ciliberto, Gerard van der Geer
In this paper we give a lower bound for the codimension of the Andreotti-Mayer loci in the moduli space of principally polarized complex abelian varieties. We also present a conjec…
math.AG1999
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…
math.AG1999
Kummer Covers with Many Points
Gerard van der Geer, Marcel van der Vlugt
We give a method for constructing Kummer covers with many points over finite fields.