%0 Journal Article
%T How to use finite fields for problems concerning infinite fields
%A Jean-Pierre Serre
%J Mathematics
%D 2009
%I arXiv
%X The first part is expository: it explains how finite fields may be used to prove theorems on infinite fields by a reduction mod p process. The second part gives a variant of P.Smith's fixed point theorem which applies in any characteristic.
%U http://arxiv.org/abs/0903.0517v2