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3
votes
Compatibility of Łośian phenomena in second-order logic
I'm not sure I have a definitive answer, but three nice observations that are too long for comments:
If you relax from ultrafilters to extenders (seen as directed systems of ultrafilters), then there …
3
votes
Accepted
Vopěnka's Principle for non-first-order logics
This is a really late answer, but the answer to your question is "No." As a dual to the Theorem 6 that Thomas Benjamin mentions above (which I believe is a result of Stavi), Janos Makowsky proved tha …