Extremal elliptic surfaces & Infinitesimal Torelli

We describe in terms of the j-invariant all elliptic surfaces pi: X -> C with a section, such that h^{1,1}(X)=rank NS(X) and the Mordell-Weil group of pi is finite. We use this to give a complete solution to infinitesimal Torelli for elliptic surfaces with a section over P^1.Comment: 16 pages; 3rd version; small changes to the third and fourth sectio

Modular forms for GL(3) and Galois representations

A description and an example are given of numerical experiments which look for a relation between modular forms for certain congruence subgroups of SL(3, Z) and Galois representations

Modular forms for GL(3) and Galois representations

Abstract. A description and an example are given of numerical experiments which look for a relation between modular forms for certain congruence subgroups of SL(3, ZZ) and Galois representations.