A Proof of the Schr\"oder-Bernstein Theorem in ACL2
Abstract
The Schr\"oder-Bernstein theorem states that, for any two sets P and Q, if there exists an injection from P to Q and an injection from Q to P, then there must exist a bijection between the two sets. Classically, it follows that the ordering of the cardinal numbers is antisymmetric. We describe a formulation and verification of the Schr\"oder-Bernstein theorem in ACL2 following a well-known proof, introducing a theory of chains to define a non-computable witness.
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