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Fritz Henglein, Hans Lei\ss. Quasi-Monadic Semi-Unification Is Decidable. In Proc. Workshop on Unification (UNIF), Leeds, England, July 1990.


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Semi-unification is a generalization of both unification and matching with applications in proof theory, term rewriting systems, polymorphic type inference, and natural language processing. It is the problem of solving a set of term inequalities M1 ≤ N1, . . . , Mk ≤ Nk , where ≤ is interpreted as the subsumption preordering on (first-order) terms. The general problem has been shown to be undecidable. As one of several special classes left-linear semi-unification, a generalization of monadic semi-unification has been shown to be efficiently decidable, though. In this paper we extend the decidability result for monadic semi-unification by permitting polyadic terms that are restricted, however, to contain occurrences of at most one variable. This is a generalization of monadic semi-unification that is essentially orthogonal to the left-linearity extension


Fritz Henglein
Hans Lei\ss

BibTex Reference

   Author = {Henglein, Fritz and Lei\ss, Hans},
   Title = {Quasi-Monadic Semi-Unification Is Decidable},
   BookTitle = {Proc. Workshop on Unification (UNIF)},
   Address = {Leeds, England},
   Month = {July},
   Year = {1990}

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