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A note on certain Tannakian group schemes

Sanjay Amrutiya — 2020

Archivum Mathematicum

In this note, we prove that the F -fundamental group scheme is a birational invariant for smooth projective varieties. We prove that the F -fundamental group scheme is naturally a quotient of the Nori fundamental group scheme. For elliptic curves, it turns out that the F -fundamental group scheme and the Nori fundamental group scheme coincide. We also consider an extension of the Nori fundamental group scheme in positive characteristic using semi-essentially finite vector bundles, and prove that in...

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