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4 votes

Is there a least-fixed-point formulation of inaccessible cardinals?

A different sort of answer is possible if one works in type theory, rather than in set theory. In type theory, the corresponding notion to a "least fixed point" is an inductively defined type. For i …
Mike Shulman's user avatar
  • 66.8k
22 votes

Reflection principle vs universes

I'd like to mention something that I think hasn't been pointed out yet. The original question began with In set-theoretic language, one fixes some strongly inaccessible cardinal $\kappa$... This imp …
Mike Shulman's user avatar
  • 66.8k
37 votes
Accepted

Reasons to believe Vopenka's principle/huge cardinals are consistent

Most of the arguments previously presented take a set-theoretic/logical point of view and apply to large cardinal axioms in general. There's a lot of good stuff there, but I think there are additiona …
Mike Shulman's user avatar
  • 66.8k