31 citations · 230 across the 65 of their papers we have counts for
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math.AG2008
Abelianisation of orthogonal groups and the fundamental group of modular varieties
V. Gritsenko, K. Hulek, G. K. Sankaran
We study the commutator subgroup of integral orthogonal groups belonging to indefinite quadratic forms. We show that the index of this commutator is 2 for many groups that occur in…
math.AG2008
Cohomology of the toroidal compactification of A_3
Klaus Hulek, Orsola Tommasi
We prove that the cohomology groups with rational coefficients of the Voronoi compactification of the moduli space of abelian threefolds coincide with the Chow groups of that space…
math.AG2008★ 31 cited
Calculating the Mordell-Weil rank of elliptic threefolds and the cohomology of singular hypersurfaces
Klaus Hulek, Remke Kloosterman
In this paper we give a method for calculating the rank of a general elliptic curve over the field of rational functions in two variables. We reduce this problem to calculating the…