On the homotopy exact sequence for Nori's fundamental group

Details On the homotopy exact sequence for Nori's fundamental group On the homotopy exact sequence for Nori's fundamental group

2009-08-04

arxiv.org/abs/0908.0498v3

Mathematics

Algebraic Geometry

Lei Zhang found a gap in the proof of Proposition 3.4. We withdraw the article, at least for the time being

Scientific paper

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

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