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Two small remarks on Nori fundamental group scheme

Hélène Esnault and Phùng Hô Hai

Number 16
Authors Phùng Hô Hai
Hélène Esnault
Year 2009

For X a complete, reduced, geometrically connected scheme over a perfect field of characteristic p > 0, we analyze the decomposition of Nori's fundamental group scheme into its local and étale parts and raise the question of the relation between the geometry and the splitting of the group scheme. We also describe in categorial terms the functor which corresponds to the inclusion of the maximal reduced subgroup scheme.

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