Download A 25-Year Perspective on Logic Programming: Achievements of by Gianfranco Rossi (auth.), Agostino Dovier, Enrico Pontelli PDF

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

This booklet celebratesthe twenty fifth anniversaryof GULP—the Italian Associationfor LogicProgramming.Authored via Italian researchersat the vanguard in their ?elds, it offers an up to date survey of a extensive choice of issues 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 season colleges. it's been specifically energetic in helping and inspiring younger researchers, by way of offering scholarships for GULP occasions and awarding special 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wait its meetings and summer season colleges, the place we will be able to know about scienti?c advances, meet up with outdated buddies and meet younger scholars. it's an honour for me to recognize our appreciation to GULP for its remarkable 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 bunch of pioneering researchers, together with representatives from undefined, nationwide examine labs, and academia, attended the constituent meeting of the gang of researchers and clients of good judgment Programming (GULP) organization. That was once the start line of a protracted experience in technology, that 1 we're nonetheless experiencing 25 years later. This quantity celebrates this crucial event.

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

Example text

We can then use to define the equivalence ≈(Ω,ca) . Moreover, since ∪Ω allows us to compose programs which share predicate symbols in Ω only, we only need the information given by clauses in C Ω , where C Ω denotes the set of clauses H :−A such that Pred (A) ⊆ Ω. Definition 9. Let I, J ⊆ C. We define I J iff for any c ∈ I there exists c ∈ J such that c ≤c c and vice versa. Moreover I ∼(Ω,ca) J iff I ∩ C Ω J ∩ C Ω . It can be shown that ∼(Ω,ca) is finer than (and hence correct wrt) ≈(Ω,ca) . ∼(Ω,ca) is a congruence wrt infinite unions and wrt the Γ operator and therefore, we obtain automatically from the scheme for any program P , I(Ω,ca) , T (Ω,ca) , O(Ω,ca) and F(Ω,ca) by using ∼(Ω,ca) as ∼.

269–282 (1979) 21. : Independence in constraint logic programs. In: ILPS, pp. 130–146 (1993) 22. : Formal bases for dataflow analysis of logic programs, pp. 115–182 (1994) 23. : The semantics of predicate logic as a programming language. Journal of the ACM 23(4), 733–742 (1976) 24. : Transformations of clp modules. Theor. Comput. Sci. 166(1&2), 101–146 (1996) 25. : Finite failures and partial computations in concurrent logic languages. Theor. Comput. Sci. 75(1&2), 45–66 (1990) Theoretical Foundations and Semantics of Logic Programming 35 26.

Therefore, in the case partial answers and call patterns, we introduce the independence in the definition by considering any selection rule. Definition 2. Let P be a program, R be a selection rule and let G be a goal such that γ there exists a derivation G P,R∗ B. 1. ϑ is a R-partial answer for G in P iff ϑ = γ|G , 2. ϑ is a correct R-partial answer for G in P iff ϑ = γ|G and B has a refutation in P, 3. A is a R-call pattern for G in P iff A is the atom selected by R in B, 4. A is a correct R-call pattern for G in P iff A is the atom selected by R in B and B has a refutation in P .

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