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Finite type Polish groups Hiroshi Ando

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Finite type Polish groups Hiroshi Ando

Abstract: Popa introduced a class of finite type Polish group. A Polish group is called of finite type if is embeddable into the unitary group of some II1 factor.

These groups are the target groups of his famous cocycle superrigidity theorem.

Popa posed a following question: if a Polish group G has a two-sided invariant metric and is embeddable into the unitary group of a Hilbert space, isGnecessarily of finite type? In this talk I present partial positive answers to the question.

The introductory talk by Federico Berlai.

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