By M. Alpuente, M. Falaschi, G. Moreno, G. Vidal (auth.), Michael Hanus, Jan Heering, Karl Meinke (eds.)
This booklet constitutes the refereed lawsuits of the sixth foreign convention on Algebraic and good judgment Programming, ALP '97 and the third foreign Workshop on Higher-Order Algebra, common sense and time period Rewriting, HOA '97, held together in Southampton, united kingdom, in September 1997.
The 18 revised complete papers offered within the ebook have been chosen from 31 submissions. the quantity is split in sections on practical and good judgment programming, higher-order equipment, time period rewriting, forms, lambda-calculus, and theorem proving methods.
Read Online or Download Algebraic and Logic Programming: 6th International Joint Conference ALP '97 — HOA '97 Southampton, UK, September 3–5, 1997 Proceedings PDF
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Extra resources for Algebraic and Logic Programming: 6th International Joint Conference ALP '97 — HOA '97 Southampton, UK, September 3–5, 1997 Proceedings
TAPSOFT'91, volume 494 of Lecture Notes in Computer Science, pages 153-180. Springer-Verlag, Berlin, 1991. 45 3. M. Codish and B. Demoen. Analysing logic programs using "prop'-ositional logic programs and a magic wand. The Journal of Logic Programming, 25(3):249-274, December 1995. 4. M. Codish, M. Falaschi, and K. Marriott. Suspension analyses for concurrent logic programs. A CM Transactions on Programming Languages and Systems, 16(3):649686, May 1994. 5. A. Cortesi, G. Fil~, and W. Winsborough.
By contrast, we have adopted an er~uation-time choice. Intuitively, the first freezes at the time of a call the non-deterministic choices that will be made to evaluate the arguments of the call, whereas the second does not. Both approaches are plausible and defensible and we defer any decision on their appropriateness to another arena. However, we observe that evaluation-time choice is more natural when semantics are based on rewriting. The call-time choice approach is sound only if some rewrite steps, legal according to the rewrite semantics, are actually prohibited.
We refer the reader to  for more details regarding to the following definition. 35 D e f i n i t i o n 6. /(P) = tf~(Te) Exanaple 1 The following table illustrates a program P (on the left) with its (finite) set of binary unfoldings (on the right): p(X, Y) *-q(X), r(Y), p(X, Y). p(X, Y) r(X), r(Y). q(a). ,-(b). p(A,B)~-q(A). p(a,A)+--r(A). p(a,b)+-q(a). p(a,b)~-r(b). q(a)+-true. p(b,b)+-true. p(A, B) *-- r(A). p(a, b) ~- p(a, b). p(a, b) ~- r(a). p(b, A) *-- r(A). r(b) ~ true. Figure 1 illustrates a simple Prolog interpreter which computes the binary unfoldings of a program P, if there are finitely many of them.