Date | Titre | Orateur | Description | Notes |
---|---|---|---|---|
23/02 | Asok-Morel I | Niels Feld | $\mathbb A^1$-connectivity, $\mathbb A^1$-chain connectedness ([Asok-Morel], Section 2.1, 2.2) | beamer |
02/03 | Asok-Morel II | Samuel Lerbet | Variants of rationality in birational geometry and comparison with $\mathbb A^1$-connectedness. Étale variant. ([Asok-Morel], sections 2.3 and 2.4) | notes |
16/03 | Asok-Morel III | Guillaume Bressan | h-cobordism and $\mathbb A^1$-classification of rational smooth proper surfaces ([Asok-Morel] Section 3) | notes |
23/03 | Asok-Morel IV | Rakesh Pawar | h-cobordisms and torsors. Classifying spaces, Eilenberg MacLane spaces, [Asok-Morel, Sections 4.1-4.3] | notes |
30/03 | ||||
20/04 | Asok-Morel V | Mattia Cavicchi | Algebraic groups and strong $\mathbb A^1$-invariance ([Asok-Morel, 4.4]). Non triviality of the $\mathbb A^1$-fundamental group of a smooth proper $k$-scheme [Asok-Morel, 5.1]. | notes |
27/04 | Asok-Morel VI | Samuel Lerbet | Computations of $\mathbb A^1$-fundamental groups: projective line and Hirzebruch surfaces. See [Asok-Morel], sections 5.1, 5.2 and 5.3 | notes |
04/05 | Asok-Morel VII | Pierre Martinez | $\mathbb A^1$-homotopical classification of rational surfaces: [Asok-Morel], sections 5.4 and 5.5 | notes |
11/05 | Asok-Morel VIII | Pierre Martinez | Birational $\mathbb A^1$-invariant sheaves and the first $\mathbb A^1$-fundamental group: [Asok-Morel], section 6 | notes |
25/05 | Contre-exemples | Riccardo Pengo | Présentation de la conjecture de A1-connexité de Morel et contre-exemple d'Ayoub en dimension >1. Présentation de la conjecture d'A1-invariance pour le pi_0 et contre-exemple de [Ayoub] | notes, bonus1, bonus2 |
01/06 | $\mathbb{A}^1$-connected components I | François Brunault | [BHS], Pages 336-348 | notes |
15/06 | $\mathbb{A}^1$-connected components II | Santiago Toro | [BHS], Pages 349-354 | notes |
22/06 | BHS $\mathbb{A}^1$-connected | Santiago Toro | [BHS], Fin | notes |
06/07 | Naive homotopies | Riccardo Pengo & Adrien Duobouloz | [BS], Fin | notes |
Références: