Categorical completeness results for the simply-typed lambda-calculus
Simpson, Alex
We investigate, in a categorical setting, some completeness properties of beta-eta conversion between closed terms of the simply-typed lambda calculus. A cartesian-closed category is said to be ...complete if, for any two unconvertible terms, there is some interpretation of the calculus in the category that distinguishes them. It is said to have a complete interpretation if there is some interpretation that equates only interconvertible terms. We give simple necessary and sufficient conditions on the category for each of the two forms of completeness to hold. The classic completeness results of, e.g., Friedman and Plotkin are immediate consequences. As another application, we derive a syntactic theorem of Statman characterizing beta-eta conversion as a maximum consistent congruence relation satisfying a property known as typical ambiguity.
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