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Handbook of Constraint Programming by Toby Walsh, Peter van Beek, Francesca Rossi

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Foundations of Artificial Intelligence, Vol. 2, Suppl. (C), 2006

ISSN: 1574-6526

doi: 10.1016/S1574-6526(06)80014-3

Chapter 10 Symmetry in Constraint Programming

Ian P. Gent, Karen E. Petrie, Jean-François Puget

Symmetry in constraints has always been important but in recent years has become a major research area in its own right. A key problem in constraint programming has long been recognised: search can revisit equivalent states over and over again. In principle this problem has been solved, with a number of different techniques. As we write, research remains very active for two reasons. First, there are many difficulties in the practical application of the techniques that are known for symmetry exclusion, and overcoming these remain ...

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