On the homotopy exact sequence for Nori's fundamental group
Hélène Esnault, Phùng Hô Hai and Eckart Viehweg
Number | 38 |
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Authors |
Phùng Hô Hai
Eckart Viehweg Hélène Esnault |
Year | 2009 |
Unlike Grothendieck's étale fundamental group, Nori's fundamental group does not fulll the homotopy exact sequence in general. We give necessary and sufficient conditions which force exactness of the sequence.