Logic of Combinatory Logic

12/13/2022
by   Simona Kašterović, et al.
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We develop a classical propositional logic for reasoning about combinatory logic. We define its syntax, axiomatic system and semantics. The syntax and axiomatic system are presented based on classical propositional logic, with typed combinatory terms as basic propositions, along with the semantics based on applicative structures extended with special elements corresponding to primitive combinators. Both the equational theory of untyped combinatory logic and the proposed axiomatic system are proved to be sound and complete w.r.t. the given semantics. In addition, we prove that combinatory logic is sound and complete w.r.t. the given semantics.

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