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Equivalence and difference between institutions: simulating Horn Clause Logic with based algebras

Published online by Cambridge University Press:  04 March 2009

Hans-Jörg Kreowski
Affiliation:
Universität Bremen, Fachbereich 3, Postfach 33 04 40, D-28334 Bremen E-mail: kreo@informatik.uni-bremen.de
Till Mossakowski
Affiliation:
Universität Bremen, Fachbereich 3, Postfach 33 04 40, D-28334 Bremen E-mail: till@informatik.uni-bremen.de

Abstract

In this paper, we investigate several logical frameworks whose expressiveness lies between Conditional Equational Logic and Horn Clause Logic. The main result deals with the PART-construction, which interprets total based algebras as partial algebras. This construction can be viewed as a simulation of Horn Clause Theories by means of Conditional Equational Theories. Other constructions in other frameworks are extendable to simulations in a similar way. The notion of categorical retractive simulation captures some essential properties of these, which allows us to measure the equivalence and difference between institutions.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1995

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