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ON THE UNIQUENESS OF β δ-NORMAL FORM OF TYPEDλ-TERMSFOR THE CANONICAL NOTION OF δ-REDUCTION

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Abstract

In this paper we consider a substitution and inheritance property, which isthe necessary and sufficient condition for the uniqueness of β δ-normal formof typed λ-terms, for canonical notion of δ-reduction. Typed λ-terms usevariables of any order and constants of order ≤1, where the constants of order1 are strongly computable, monotonic functions with indeterminate values ofarguments. The canonical notion ofδ-reduction is the notion ofδ-reductionthat is used in the implementation of functional programming languages.

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