Automated deduction in von Neumann-Bernays-Go¨del set theory
Journal of Automated Reasoning
Set theory for verification. I: from foundations to functions
Journal of Automated Reasoning
On Computer-Assisted Proofs in Ordinal Number Theory
Journal of Automated Reasoning
A Compendium of Continuous Lattices in MIZAR
Journal of Automated Reasoning
The Reflection Theorem: A Study in Meta-theoretic Reasoning
CADE-18 Proceedings of the 18th International Conference on Automated Deduction
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Gödel [3] published a monograph in 1940 proving a highly significant theorem, namely that the axiom of choice (AC) and the generalized continuum hypothesis (GCH) are consistent with respect to the other axioms of set theory. This theorem addresses the first of Hilbert's famous list of unsolved problems in mathematics. I have mechanized this work [8] using Isabelle/ZF [5,6]. Obviously, the theorem's significance makes it a tempting challenge; the proof also has numerous interesting features. It is not a single formal assertion, as most theorems are. Gödel [3, p. 33] states it as follows, using Σto denote the axioms for set theory:What we shall prove is that, if a contradiction from the axiom of choice and the generalized continuum hypothesis were derived in Σ, it could be transformed into a contradiction obtained from the axioms of Σalone.Gödel presents no other statement of this theorem. Neither does he introduce a theory of syntax suitable for reasoning about transformations on proofs, surely because he considers it to be unnecessary