Contractibility and Contractible Approximations of Soft Global Constraints

Author Michael J. Maher



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Michael J. Maher

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Michael J. Maher. Contractibility and Contractible Approximations of Soft Global Constraints. In Technical Communications of the 26th International Conference on Logic Programming. Leibniz International Proceedings in Informatics (LIPIcs), Volume 7, pp. 114-123, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2010)
https://doi.org/10.4230/LIPIcs.ICLP.2010.114

Abstract

We study contractibility and its approximation for two very general classes of soft global constraints. We introduce a general formulation of decomposition-based soft constraints and provide a sufficient condition for contractibility and an approach to approximation. For edit-based soft constraints, we establish that the tightest contractible approximation cannot be expressed in edit-based terms, in general.
Keywords
  • Constraint logic programming
  • global constraints
  • open constraints
  • soft constraints

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