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R. K. Shyamasundar, M. R. K. Krishna Rao, Deepak Kapur's ALPUK92: Proceedings of the 4th UK Conference on Logic PDF

By R. K. Shyamasundar, M. R. K. Krishna Rao, Deepak Kapur (auth.), Krysia Broda BSc, MSc, PhD (eds.)

ISBN-10: 1447134214

ISBN-13: 9781447134213

ISBN-10: 3540197834

ISBN-13: 9783540197836

Since its belief approximately two decades in the past, common sense programming has been built to the purpose the place it now performs a big position in components comparable to database idea, synthetic intelligence and software program engineering. There are, although, nonetheless many extraordinary study matters which must be addressed, and the united kingdom department of the organization for good judgment Programming used to be organize to supply a discussion board the place the flourishing learn neighborhood may well talk about vital concerns which have been usually by means of- handed on the better foreign meetings. This quantity includes the invited papers, refereed papers and tutorials awarded on the 4th ALPUK convention, which aimed to expand the frontiers of good judgment programming via encouraging interplay among it and different comparable disciplines. The papers conceal quite a few technical components, together with concurrent good judgment languages and their semantics, functions of common sense languages to different (non-classical) logical platforms, modules, varieties and error-handling, and the allotted execution of Prolog courses. The vast scope of the papers refelects the breadth of curiosity during this vital sector of desktop technology. ALPUK 92 offers a finished evaluate of present growth being made in good judgment programming examine. it is going to be of curiosity to all staff within the box, specifically researchers, postgraduate scholars, and learn and improvement staff in industry.

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Extra info for ALPUK92: Proceedings of the 4th UK Conference on Logic Programming, London, 30 March – 1 April 1992

Sample text

The notions of term, atom, substitution, ... are defined as usual. The corresponding sets are respectively referred to as Sterm, Satom, Ssubst, .... We do not recall these notions here but rather specify some notions related to contextual logic programming as well as some useful notations. An extension formula is a formula of the form u~ G where u is a unit name and G is a finite conjunction of atomic or extension formulae. A general atom (g-atom) is an atomic or an extension formula. It is typically denoted by the letters A, B, C, ....

Let (Cl): A +- r, B, a and (C2): C +- c) be two clauses such that there exists u, an mgu of Band C; the result of unfolding the atom B with the clause (C2) is the following clause (C3): (A +- r, c) ,a)u. 2 (Folding) Folding consists of replacing an instance of the body of a clause by the corresponding head instance of this clause: Let (Cl): A +- r, a, c) and (C2): B +- A be two clauses and u a substitution such that Au a, the folding of (C2) in (Cl) is the clause (C3): A +- r, Bu, c). 3 (Introduction of a new definition) This consists of the introduction of a new predicate in terms of already existing 44 ones.

This paper deals with the way to discover these properties. First we introduce notions of a well-behaved clause and definite program. We prove that under certain conditions the application of the Unfold/Fold transformations preserves the notion of well-behavedness. We introduce a strategy based on static program analysis for the synthesis of Eureka properties for a class of logic programs called candidate programs. Finally we illustrate this strategy by a complete example. Key Words: logic programs, transformation, correctness, mode inputoutput, strategy, definite program, folding, unfolding, property.

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ALPUK92: Proceedings of the 4th UK Conference on Logic Programming, London, 30 March – 1 April 1992 by R. K. Shyamasundar, M. R. K. Krishna Rao, Deepak Kapur (auth.), Krysia Broda BSc, MSc, PhD (eds.)


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