On isomorphisms of intersection types

On isomorphisms of intersection types,10.1145/1805950.1805955,ACM Transactions on Computational Logic,Mariangiola Dezani-Ciancaglini,Roberto Di Cosmo,

On isomorphisms of intersection types  
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The study of type isomorphisms for different λ-calculi started over twenty years ago, and a very wide body of knowledge has been established, both in terms of results and in terms of techniques. A notable missing piece of the puzzle was the characterization of type isomorphisms in the presence of intersection types. While, at first thought, this may seem to be a simple exercise, it turns out that not only finding the right characterization is not simple, but that the very notion of isomorphism in intersection types is an unexpectedly original element in the previously known landscape, breaking most of the known properties of isomorphisms of the typed λ-calculus. In particular, isomorphism is not a congruence and types that are equal in the standard models of intersection types may be nonisomorphic.
Journal: ACM Transactions on Computational Logic - TOCL , vol. 11, no. 4, pp. 1-24, 2010
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