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Vortragende Person/Vortragende Personen:
Philip Welch (University of Bristol)

Welch Talk Abstract: 

We investigate when the predicate " x = Powerset(y)" can be Sigma_1(Card) where Card is a predicate for the cardinal numbers. This has relations to the Härtig quantifier logic which is intermediate between first and second order logic. We discuss Löwenheim-Skolem numbers for such a logic, and, to an extent, analyse the class of its validities.  (This is joint work with Jouko Väänänen.)