Read e-book online A 25-Year Perspective on Logic Programming: Achievements of PDF

By Gianfranco Rossi (auth.), Agostino Dovier, Enrico Pontelli (eds.)

ISBN-10: 3642143083

ISBN-13: 9783642143083

This e-book celebratesthe twenty fifth anniversaryof GULP—the Italian Associationfor LogicProgramming.Authored by means of Italian researchersat the vanguard in their ?elds, it offers an updated survey of a extensive number of subject matters in good judgment programming, making it an invaluable reference for either researchers and scholars. in the course of its 25-year lifestyles, GULP has organised quite a lot of nationwide and foreign actions, together with either meetings and summer time colleges. it's been specifically energetic in aiding and inspiring younger researchers, through supplying scholarships for GULP occasions and awarding exceptional disser- tions. WeintheinternationallogicprogrammingcommunitylookuponGULPwith a mixture of envy, admiration and gratitude. we're happy to wait its meetings and summer season faculties, the place we will know about scienti?c advances, meet up with outdated associates and meet younger scholars. it's an honour for me to recognize our appreciation to GULP for its amazing contributions to our ?eld and to specific our greatest needs for its carrying on with prosperity sooner or later. March 2010 Robert Kowalski Imperial university London Preface On June 18, 1985, a gaggle of pioneering researchers, together with representatives from undefined, nationwide study labs, and academia, attended the constituent meeting of the gang of researchers and clients of common sense Programming (GULP) organization. That used to be the start line of an extended experience in technological know-how, that 1 we're nonetheless experiencing 25 years later. This quantity celebrates this significant event.

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Additional info for A 25-Year Perspective on Logic Programming: Achievements of the Italian Association for Logic Programming, GULP

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14] builds upon the idea in [13] of providing an algebraic characterization of the observables. [14] extends the approach, by taking two basic semantics: a denotational semantics and a transition system which define SLD-derivations. In addition, the semantic properties of the observables are expressed as compositionality properties. 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.

Let P be a program. F (P ) = TP ↑ ω ∈ I. e. it contains also the intermediate results of non-terminated (and possibly non-terminating) computations. Indeed, no matter which specific ∼ equivalence is used, the equality of the top-down and the bottom-up constructions holds [30]. This general result simplifies the treatment in specific cases since it is usually easier proving the congruence requirements on ∼ rather than proving the stated equality. Lemma 1 (Equivalence). Let P be a program, ∼ be an equivalence on ℘(C) which is a congruence wrt infinite unions and wrt the Γ operator.

We give two equivalent characterizations. The top-down one has a definition in the style of an operational semantics, while the bottom-up one is based on the fixpoint of a general immediate consequences operator. Let us first define the top-down semantics O(P ). Definition 4 (Operational Semantic Scheme). Let P be a program. O(P ) = [{Φ ∈ C | Φ is a resultant for a goal of the form p(X) in P }] ∈ I. Note that O(P ) is a π-interpretation and it is the (equivalence class of the) set of all the resultants obtained from goals of the form p(X) in P for any possible selection rule.

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A 25-Year Perspective on Logic Programming: Achievements of the Italian Association for Logic Programming, GULP by Gianfranco Rossi (auth.), Agostino Dovier, Enrico Pontelli (eds.)

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