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On the homotopy exact sequence for Nori's fundamental group

Hélène Esnault, Phùng Hô Hai and Eckart Viehweg

Number 38
Authors Phùng Hô Hai
Eckart Viehweg
Hélène Esnault
Year 2009

Unlike Grothendieck's étale fundamental group, Nori's fundamental group does not ful ll the homotopy exact sequence in general. We give necessary and sufficient conditions which force exactness of the sequence.

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