Year: 2026
Type: preprint
Abstract: We examine the metamathematical significance of the Levy scheme $Λ$, which asserts, for each natural number $n$, the existence of an $n$-Mahlo cardinal $κ$ such that $V_κ\prec_{Σ_n}V$. Several initially unrelated constructions single out $\mathsf{ZFC}+Λ$: comparisons with the model theory of arithmetic and finite set theory; class theories in which the class of ordinals has the tree property; set theories with a proper class of indiscernibles; and interpretations of ordinary set theory in Cantorian parts of models of the extension \mathsf{NFUA} of Quine--Jensen set theory $\mathsf{NFU}$. Taken together, the results surveyed here provide a precise sense in which $\mathsf{ZFC}+Λ$ is an inevitable extension of $\mathsf{ZFC}$ if one attempts to generalize certain metamathematical results about the microcosm of hereditarily finite sets to the entire macrocosm of sets.
Source: arXiv (Cornell University)
Author: Enayat, Ali
Language: English
Subfield: Geometry and Topology
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7221970280