This paper discusses decidability and existence of principal types in type assignment systems for λ-terms in which types are considered modulo an equivalence relation induced by a set of type equations. There are two interesting ways of defining such equivalence, an initial and a final one. A suitable transformation will allow to treat both in an uniform way.
CITATION STYLE
Coppo, M. (2001). Type inference with recursive type equations. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 2030, pp. 184–198). Springer Verlag. https://doi.org/10.1007/3-540-45315-6_12
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