Journal of Symbolic Logic

The Church-Rosser property in dual combinatory logic

Katalin Bimbó

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Dual combinators emerge from the aim of assigning formulas containing $\leftarrow$ as types to combinators. This paper investigates formally some of the properties of combinatory systems that include both combinators and dual combinators. Although the addition of dual combinators to a combinatory system does not affect the unique decomposition of terms, it turns out that some terms might be redexes in two ways (with a combinator as its head, and with a dual combinator as its head). We prove a general theorem stating that no dual combinatory system possesses the Church-Rosser property. Although the lack of confluence might be problematic in some cases, it is not a problem per se. In particular, we show that no damage is inflicted upon the structurally free logics, the system in which dual combinators first appeared.

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J. Symbolic Logic, Volume 68, Issue 1 (2003), 132-152.

First available in Project Euclid: 21 February 2003

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Bimbó, Katalin. The Church-Rosser property in dual combinatory logic. J. Symbolic Logic 68 (2003), no. 1, 132--152. doi:10.2178/jsl/1045861508.

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