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Unfold/fold transformations of logic programs

Published online by Cambridge University Press:  04 March 2009

J. C. Shepherdson
J. C. Shepherdson
Affiliation:
Mathematics Department, University of Bristol, Bristol, Uk
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Abstract

Unfold/fold transformations have been used in logic programming for some years to transform programs into more efficient ones. We describe recent work on the extent to which these transformations produce programs which are equivalent to the original one. Various notions of equivalence are considered: same success set; finite failure set; least Herbrand model; completion. This is used to illustrate the rather unsatisfactory relationship between logic programming and logic shown by the wide variety of different declarative semantics proposed for logic programs.

Type
Research Article
Information
Mathematical Structures in Computer Science , Volume 2 , Issue 2 , June 1992 , pp. 143 - 157
Copyright
Copyright © Cambridge University Press 1992

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