Karen Vogtmann at MSRI - The geometry of spaces of finite labelled trees

<BODY> MSRI Streaming Video Series <BR> Karen Vogtmann - The geometry of spaces of finite labelled trees <BR> Abstract: Spaces of finite trees with k labelled leaves arise in seemingly diverse subjects, including automorphisms of free groups, symplectic Lie algebras, and molecular phylogenetics. These spaces carry natural metrics of non-positive curvature, and we study geodesics in these spaces as well as different notions of centroid and probability measures. </BODY>