# Proper actions of wreath products

Algebra/Geometry/Topology Seminar

#### by Yves de Cornulier

Institution: Rennes
Date: Mon 7th December 2009
Time: 1:00 PM
Location: Sisalkraft Theatre, Architecture

Abstract: If two groups have a proper action on a Hilbert space (Haagerup's Property), then so does the wreath product of the two groups. The proof uses a characterization of the Haagerup Property in terms of spaces with measured walls.