Classification of von Neumann Algebras - Rothschild Lecture

Explore the dichotomy between amenability and non-amenability in von Neumann algebras during this Rothschild Lecture delivered by Professor Stefaan Vaes from KU Leuven. Delve into the fascinating world of operator algebras, focusing on the classification of von Neumann algebras and their applications. Discover how this dichotomy manifests in various contexts, including the Banach-Tarski paradox in three-dimensional space and its absence in two dimensions. Examine the complete classification of amenable von Neumann algebras by Connes and Haagerup, and contrast it with the rigidity theorems found in non-amenable cases, particularly within Sorin Popa's deformation/rigidity theory. Gain insights into the gap between amenability and non-amenability for von Neumann algebras associated with countable groups, locally compact groups, and group actions on probability spaces.