By Brahim Hnich, Mats Carlsson, Francois Fages, Francesca Rossi
This ebook constitutes the completely refereed and prolonged post-proceedings of the Joint ERCIM/CoLogNet overseas Workshop on Constraint fixing and Constraint good judgment Programming, CSCLP 2005, held in Uppsala, Sweden in June 2005.
Besides papers taken from the workshop, others are submitted according to an open demand papers after the workshop.
The 12 revised complete papers offered have been rigorously reviewed and chosen for inclusion within the booklet. The papers are equipped in topical sections on international constraints, seek and heuristics, language and implementation concerns, and modeling.
Read or Download Recent Advances in Constraints: Joint ERCIM/CoLogNET International Workshop on Constraint Solving and Constraint Logic Programming, CSCLP 2005, Uppsala, PDF
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Extra info for Recent Advances in Constraints: Joint ERCIM/CoLogNET International Workshop on Constraint Solving and Constraint Logic Programming, CSCLP 2005, Uppsala,
The remaining constant-factor slow-down observed in the implementation experiments is the price one currently has to pay for using a very high-level language as CHR in contrast to a low-level hard-wired implementation. Since the run-time increase is by a constant factor only, we can hope that compiler optimization will further close the performance gap. g. using it in chains or with a summation constraint, or simplifying lex constraints for symmetry breaking. As for the instantiations of the generic constraint solver to speciﬁc built-in constraint systems, several issues are open: To show that the ﬁnite domain instance maintains generalized arc consistency, to use other underlying built-in constraint systems such as linear polynomials or temporal constraints, and to give an implementation that does not rely on built-in constraints for inequality, but rather uses existing CHR solvers.
Professional Book Center. 7. M. K. 1999. Increasing Constraint Propagation by Redundant Modeling: an Experience Report. Constraints 4(2): 167–192. 8. -C. 1994. A ﬁltering algorithm for constraints of diﬀerence in CSPs. In Proc. of AAAI 1994, 362–367. AAAI Press. 9. -C. 1996. Generalized arc consistency for global cardinality constraints. In Proc. of AAAI 1996, 209–215. AAAI Press / The MIT Press. 10. , and Gervet, C. 2001. Global reasoning on sets. In Proc. of Workshop on Modelling and Problem Formulation (FORMUL’01).
The last result is somewhat surprising, since the Disjoint constraint is related to (and weaker than) the AllDifferent constraint. When we demonstrate the intractability of a constraint like Disjoint, we also present a polynomial method to propagate the constraint. Finally, we consider Among, Common and Disjoint constraints over set variables rather than integer variables. We show that most of the results on integer variables hold for set variables with the exception that the Disjoint constraint now becomes tractable.
Recent Advances in Constraints: Joint ERCIM/CoLogNET International Workshop on Constraint Solving and Constraint Logic Programming, CSCLP 2005, Uppsala, by Brahim Hnich, Mats Carlsson, Francois Fages, Francesca Rossi