Matt Foreman: Measure preserving diffeomorphisms of the torus are not classifiable

Friday Set Theory Seminar (HUJI)

We shall meet Friday (December 19) in the Hebrew University math
department building, Room 110, at 10 am.

Speaker: Matt Foreman (UCI)

Title: Measure preserving diffeomorphisms of the torus are not classifiable.

Abstract: In joint work with B Weiss, we show that the isomorphism relation for diffeomorphisms of the torus is complete analytic. Moreover it lies above every S^\infty action in the hierarchy of equivalence relations under Borel reducibility.

See you there!

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