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Topic Archive: Chang model

Set theory seminarFriday, October 12, 201212:00 amGC 6417

Nam Trang

Generalized Solovay Measures

University of California at Berkeley

We will introduce some background and recent progress made in solving the following open problem:

Determine the exact consistency strength of the theory T = ZF + DC + $omega_1$ is supercompact.

It’s known that the upper-bound consistency strength for T is a class of Woodin limits of Woodin cardinals which is (surprisingly) much weaker than ZFC + a supercompact. We will discuss how one might go about computing lower-bounds for T. If time allows, we’ll briefly talk about the relationship of T with the Chang model (CM) and its generalization (CM^+).