A fixed point theorem of Bader, Gelander and Monod
Stuart White (U. Glasgow)
Tuesday 21st December, 2010 16:00-17:00 204
Two weeks ago, Bader, Gelander and Monod arXived a fixed point theorem for groups acting on $L^1$-spaces (arXiv:1012.1488). This is quite surprising, at least to me, as it produces fixed points outside convex sets, and it seems to be widely applicable: Haagerup's weak amenability of all nuclear C*-algebras and Losert's solution to the derivation problem for L^1(G) are both easy deductions. I hope to give a self-contained talk explaining this result.