Groups with the Haagerup Property: Gromov's a-T-menability
Pierre-Alain Cherix,Michael Cowling,Paul Jolissaint,Pierre Julg,Alain Valette
Groups with the Haagerup Property: Gromov’s a-T-menability
Pierre-Alain Cherix,Michael Cowling,Paul Jolissaint,Pierre Julg,Alain Valette
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A locally compact group has the Haagerup property, or is a-T-menable in the sense of Gromov, if it admits a proper isometric action on some affine Hilbert space. As Gromov’s pun is trying to indicate, this definition is designed as a strong negation to Kazhdan’s property (T), characterized by the fact that every isometric action on some affine Hilbert space has a fixed point. This book is to covers various aspects of the Haagerup property. It gives several new examples.
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