Volume 6: January - December 1996

Issue 4: August 1996

Abstract


Resultant semantics for prolog

  • Resultant semantics for prolog
  • M. Gabrielli1, G. Levi2 and MC. Meo3 Departimento di Informatica, Universita di Pisa, Corso Italia 40, 56125 Pisa, Italy, 1Email: gabbri@di.unip.it, 2Email: levi@di.unipi.it and 3Dipartimento di Matematica Pura ed Applicata, Universita di L'Aquila, Via Vetoio, Localita coppito, 67010 L'Aquila, Italy. Email: meo@univaq.it

    ABSTRACT

    In this paper we study some first-order formulas, called resultants, which can be used to describe in a concise way most of the relevant information associated to SLD-derivations. We first extend to resultants some classical results of logic programming theory. Then we define a fixpoint semantics for Prolog computed resultants, i.e. those formulas which are obtained by considering the leftmost selection rule. Suitable abstractions of such a semantics are then used to model call patterns and partial answers. Finally we show how these results can be generalized to a larger class of selection rules.

    Keywords: Resultants, partial answers, call patterns, fixpoint semantics.

    Pages: 491 - 521

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