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De - Pt| English Dictionary: constraint satisfaction | by the DICT Development Group |
| 1 result for constraint satisfaction | |
| From The Free On-line Dictionary of Computing (15Feb98) [foldoc]: | |
|
constraint satisfaction while meeting certain requirements or "{constraints}". For example, in {graph colouring}, a node is a variable, the colour assigned to it is its value and a link between two nodes represents the constraint that those two nodes must not be assigned the same colour. In {scheduling}, constraints apply to such variables as the starting and ending times for tasks. The {Simplex} method is one well known technique for solving numerical constraints. The search difficulty of constraint satisfaction problems can be determined on average from knowledge of easily computed structural properties of the problems. In fact, hard instances of {NP-complete} problems are concentrated near an abrupt transition between under- and over-constrained problems. This transition is analogous to phase transitions in physical systems and offers a way to estimate the likely difficulty of a constraint problem before attempting to solve it with search. {Phase transitions in search (ftp://parcftp.xerox.com/pub/dynamics/constraints.html)} (Tad Hogg, {XEROX PARC}). (1995-02-15) | |
