Isoperimetric inequalities in CAT(0) spacesGeometric Group Theory Oberseminar

by Cornelia Drutu

Wednesday Feb 4, 2026, 11:00 AM → 12:00 PM Europe/Berlin

Endenicher Allee 60/0-008 (Mathezentrum)

In this talk, I shall explain the existence, in non-positively curved spaces, of a 2-dimensional isoperimetric gap, similar to the one in dimension 1, i.e. for the filling of loops by discs. The argument is based on the thinness of a particular type of tetrahedra, the minimal tetrahedra. This is joint work with Urs Lang, Panos Papasoglu and Stephan Stadler.