代数幾何学セミナー


2017/12/8(Fri)

14:40--15:40 E404/406/408(時間と場所がいつもと異なることにご注意下さい)

Fabio Tonini

Freie University Berlin

Representations of the Nori fundamental groups

Abstract: The Nori fundamental group scheme of a scheme X with a rational point x is a profinite group scheme that "controls" torsors over X under finite group schemes with a trivialization on x. Via Tannaka's duality affine group schemes are completely determined by their category of representations. In the talk I will give a description of the category of representations of the Nori fundamental group by considering vector bundles with extra structure.