By Gianfranco Rossi (auth.), Agostino Dovier, Enrico Pontelli (eds.)
This e-book celebratesthe twenty fifth anniversaryof GULP—the Italian Associationfor LogicProgramming.Authored through Italian researchersat the forefront in their ?elds, it provides an updated survey of a huge number of subject matters in common sense programming, making it an invaluable reference for either researchers and scholars. in the course of its 25-year life, GULP has organised quite a lot of nationwide and foreign actions, together with either meetings and summer time colleges. it's been in particular lively in aiding and inspiring younger researchers, through supplying scholarships for GULP occasions and awarding exclusive disser- tions. WeintheinternationallogicprogrammingcommunitylookuponGULPwith a mix of envy, admiration and gratitude. we're happy to wait its meetings and summer season colleges, the place we will be able to find out about scienti?c advances, meet up with outdated pals and meet younger scholars. it's an honour for me to recognize our appreciation to GULP for its extraordinary contributions to our ?eld and to precise our greatest needs for its carrying on with prosperity sooner or later. March 2010 Robert Kowalski Imperial collage London Preface On June 18, 1985, a gaggle of pioneering researchers, together with representatives from undefined, nationwide examine labs, and academia, attended the constituent meeting of the crowd of researchers and clients of common sense Programming (GULP) organization. That used to be the start line of a protracted experience in technological know-how, that 1 we're nonetheless experiencing 25 years later. This quantity celebrates this significant event.
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Extra resources for A 25-Year Perspective on Logic Programming: Achievements of the Italian Association for Logic Programming, GULP
Springer, Heidelberg (1997) 16. : Abstract diagnosis. Journal of Logic Programming 39(1-3), 43–93 (1999) 17. : Abstract debugging of logic program. , Turini, F. ) LOPSTR 1994 and META 1994. LNCS, vol. 883, pp. 440–450. Springer, Heidelberg (1994) 18. : Program analysis: the abstract interpretation perspective. ACM Computing Surveys 28(4es), 165 (1996) 19. : Abstract interpretation: A unified lattice model for static analysis of programs by construction or approximation of fixpoints. In: POPL, pp.
This 32 A. C. Meo leads to a more flexible classification of the observables, where it is possible reason about properties such as OR-compositionality and existence of abstract transition systems. Using abstract interpretation techniques to model abstraction allows us to state very simple conditions on the observables which guarantee the validity of several general theorems. The idea is to define the denotational semantics and the transition system for SLDderivations in terms of four semantic operators, directly related to the syntactic structure of the language.
Of idempotent mgu’s such that G = G0 and, for i ≥ 1, each Gi is derived from Gi−1 and ci by using ϑi . An SLD-refutation of P ∪ G is a finite SLD-derivation of P ∪ G which has the empty clause ✷ as the last goal in the derivation. Following , a selection rule R is a function which when applied to a “history” containing all the clauses and the mgu’s used in the derivation G0 , G1 , . . , Gi , returns an atom in Gi (the selected atom in Gi ). Given a selection rule R, an SLD-derivation is called via R if all the selections of atoms in the resolvents are performed according to R.