## Proper isometric actions of wreath products.

#### Alain ValetteUniversité de NeuchâtelMathematics

We prove that, if $G,H$ are countable groups admitting a proper isometric action (resp. a uniform metric embedding) on Hilbert space, then so does the wreath product $H\wr G$. This is joint work with Y. de Cornulier and Y. Stalder.

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