Criterion for surjectivity of localization in Galois cohomology of a reductive group over a number field

Abstract

Let $G$ be a connected reductive group over a number field $F$, and let $S$ be a set (finite or infinite) of places of $F$. We give a necessary and sufficient condition for the surjectivity of the localization map from $H^1(F,G)$ to the "direct sum" of the sets $H^1(F_v,G)$ where $v$ runs over $S$. In the appendices, we give a new construction of the abelian Galois cohomology of a reductive group over a field of arbitrary characteristic.

arXiv commentV.1: 10 pages. V.2: 15 pages, with two new appendices, one by Borovoi and another one by Rosengarten. V.3: 15 pages, final version, to appear in Comptes Rendus Mathematique