The Picard group of a K3K3 surface and its reduction modulo pp

preprint2010arXivOpen access

Abstract

We present a method to compute the geometric Picard rank of a K3K3 surface over $\bbQ$. Contrary to a widely held belief, we show it is possible to verify Picard rank 11 using reduction only at a single prime. Our method is based on deformation theory for invertible sheaves.

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