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!