Analytic and Algebraic Geometry 2017
DOI: 10.1007/978-981-10-5648-2_1
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On the Bumpy Fundamental Group Scheme

Abstract: In this short paper we first recall the definition and the construction of the fundamental group scheme of a scheme X in the known cases: when it is defined over a field and when it is defined over a Dedekind scheme. It classifies all the finite (or quasi-finite) fpqc torsors over X. When X is defined over a noetherian regular scheme S of any dimension we do not know if such an object can be constructed. This is why we introduce a new category, containing the fpqc torsors, whose objects are torsors for a new t… Show more

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