Buongiorno, Vi ricordo che il prossimo seminario di Geometria e Topologia sarà tenuto da Pietro Capovilla e si terrà Mercoledì 18 Giugno alle ore 14:30 presso l'aula Seminari. Per gli interessati ad andare a pranzo con lo speaker, l'appuntamento è in atrio alle 12:45. Allego titolo e abstract Titolo: Combination theorems for open covers Abstract: The generalized Lusternik-Schnirelmann category of a space is the minimal cardinality of open covers by subsets whose fundamental group is contained in a given family of groups. The goal of this talk is to present a combination theorem for generalized LS-categories of groups G in terms of the stabilizers of contractible CW-complex equipped with an action by G. This fact has applications to the geometric dimensions of groups and to the simplicial volume of manifolds obtained by gluing. A presto, Carlo e Filippo