Derived Seminar

vendredi 20 févr. 2026, 13:45 → 18:00 Europe/Paris

Amphithéâtre Yvonne Choquet-Bruhat (IHP - Bâtiment Perrin)

Jean-Baptiste Teyssier (IMJ-PRG), Marco Robalo (Sorbonne University), Maria Yakerson (IMJ-PRG)

13:45 → 15:30 TBA

Orateur: Denis-Charles Cisinski (University of Regensbourg)

16:00 → 17:45 Derived Hopf rings and motivic homotopy theory

The Ravenel--Wilson Hopf ring is an algebraic object which describes the homology of the spaces comprising the spectrum MU. It is characterized by a universal property in a 1-category. I will report on joint work with M. Hopkins, in which we (a) show that (a slight variant of) the Ravenel--Wilson Hopf ring satisfies a related universal property in an oo-category, and (2) can be used to described the motivic homology of the spaces comprising MGL.

Orateur: Tom Bachmann (University of Mainz)