The inclusion of the second-order constructible universe in the first-order constructible universe
The inclusion of the second-order constructible universe in the first-order constructible universe
Let and denote the inner models defined in the paper, with the model generated using the relevant class of structures and the second-order constructible universe. Inclusion conjecture. Assuming appropriate large cardinals, we have
This is a proposed relationship between the two inner models. The surrounding text gives related positive results under a proper class of Woodin cardinals and under for reals and subsets of , but does not resolve the full inclusion.
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Sources & referencesView supporting material
Primary source
Menachem Magidor and Jouko Väänänen, “New inner models from second order logics”, arXiv:2508.17672 (2025).
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