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CONSTRAINTS
2010

Lexicographically-ordered constraint satisfaction problems

9 years 12 months ago
Lexicographically-ordered constraint satisfaction problems
Abstract. We describe a simple CSP formalism for handling multi-attribute preference problems with hard constraints, one that combines hard constraints and preferences so the two are easily distinguished conceptually and for purposes of problem solving. Preferences are represented as a lexicographic order over complete assignments based on variable importance and rankings of values in each domain. Feasibility constraints are treated in the usual manner. Since the preference representation is ordinal in character, these problems can be solved with algorithms that do not require evaluations to be represented explicitly. This includes ordinary CSP algorithms, although these cannot stop searching until all solutions have been checked, with the important exception of heuristics that follow the preference order (lexical variable and value ordering). We describe relations between lexicographic CSPs and more general soft constraint formalisms and show how a full lexicographic ordering can be e...
Eugene C. Freuder, Robert Heffernan, Richard J. Wa
Added 09 Dec 2010
Updated 09 Dec 2010
Type Journal
Year 2010
Where CONSTRAINTS
Authors Eugene C. Freuder, Robert Heffernan, Richard J. Wallace, Nic Wilson
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