A categorical unification algorithm
Proceedings of a tutorial and workshop on Category theory and computer programming
The Z notation: a reference manual
The Z notation: a reference manual
ACM Transactions on Computational Logic (TOCL)
Goguen Categories: A Categorical Approach to L-fuzzy Relations
Goguen Categories: A Categorical Approach to L-fuzzy Relations
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We present two different relational generalisations of substitutions, show that they both produce locally ordered categories with domain, and then develop the single-morphism "determiniser" concept that relies only on this framework, while still corresponding to conventional two-morphism unification in both examples. Central to this development is the determinacy concept of "characterisation by domain" introduced by Desharnais and Möller for Kleene algebras with domain; this is here applied in the weakest possible setting.