Abstract
A streamlined proof of a theorem of Putnam’s: any satisfiable schema of predicate calculus has a model in which the predicates are interpreted as Boolean combinations of recursively enumerable relations. Related open problems are canvassed.
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Notes
- 1.
I am grateful to Gary Ebbs and Carl G. Jockusch, Jr. for helpful comments.
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Goldfarb, W. (2018). Putnam’s Theorem on the Complexity of Models. In: Hellman, G., Cook, R. (eds) Hilary Putnam on Logic and Mathematics. Outstanding Contributions to Logic, vol 9. Springer, Cham. https://doi.org/10.1007/978-3-319-96274-0_4
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