The motivic fundamental groupoid at tangential basepoints

Quand : 28 mai 2026 à 14:00

Où : UMPA

Organisé par : Institut Henri Poincaré

If U s a smooth scheme over a subfield of the field of complex numbers, it is known from the work of Pierre Deligne and Alexander Goncharov that the prounipotent completion of the fundamental group of U based at any point has a motivic incarnation. More precisely, its coordinate ring arises as the degree-zero homology of the Betti realization of a Hopf algebra object in Voevodsky's triangulated ca