Functional Pearl: The Distributive λ-Calculus

BENIAMINO ACCATTOLI; ALEJANDRO DÍAZ-CARO

LECTURE NOTES IN COMPUTER SCIENCE

Springer

Año: 2020 vol. 1207 p. 33 - 49

0302-9743

We introduce a simple extension of the λ-calculus with pairs---called the distributive λ-calculus---obtained by adding a computational interpretation of the valid distributivity isomorphism A⇒(B∧C) ≡ (A⇒B)∧(A⇒C) of simple types. We study the calculus both as an untyped and as a simply typed setting. Key features of the untyped calculus are confluence, the absence of clashes of constructs, that is, evaluation never gets stuck, and a leftmost-outermost normalization theorem, obtained with straightforward proofs. With respect to simple types, we show that the new rules satisfy subject reduction if types are considered up to the distributivity isomorphism. The main result is strong normalization for simple types up to distributivity. The proof is a smooth variation over the one for the λ-calculus with pairs and simple types.La publicación es LNCS 12073:33-49 (el formulario no deja poner 5 dígitos para el volume).