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Existential quantifiers in abstract data types

M. Broy1, W. Dosch1, H. Partsch1, P. Pepper1 and M. Wirsing1

(1)  Institut für Informatik, Technische Universität München, Postfach 20 24 20, D-8000 München 2
Abstract
Hierarchies of abstract data types are specified by axioms which are positive formulas consisting of universally and existentially quantified disjunctions and conjunctions of equations. Necessary and sufficient conditions for the existence of terminal algebras are investigated. Furthermore, some advantages of disjunctions and existential quantifiers within the laws are discussed and the usefulness of terminal algebras is demonstrated by a few examples.
This research was carried out within the Sonderforschungsbereich 49, Programmiertechnik, Munich.
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