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» GAC on Conjunctions of Constraints
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PPDP
2010
Springer
13 years 5 months ago
Semantics-preserving translations between linear concurrent constraint programming and constraint handling rules
The Constraint Simplification Rules (CSR) subset of CHR and the flat subset of LCC, where agent nesting is restricted, are very close syntactically and semantically. The first con...
Thierry Martinez
TCS
1998
13 years 7 months ago
Foundations of Aggregation Constraints
We introduce a new constraint domain, aggregation constraints, that is useful in database query languages, and in constraint logic programming languages that incorporate aggregate...
Kenneth A. Ross, Divesh Srivastava, Peter J. Stuck...
LOPSTR
2007
Springer
14 years 1 months ago
Aggregates for CHR through Program Transformation
We propose an extension of Constraint Handling Rules (CHR) with aggregates such as sum, count, findall, and min. This new feature significantly improves the conciseness and expres...
Peter Van Weert, Jon Sneyers, Bart Demoen
CPAIOR
2006
Springer
13 years 11 months ago
Open Constraints in a Closed World
We study domain filtering algorithms for open constraints, i.e., constraints that are not a priori defined on specific sets of variables. We present an efficient filtering algorith...
Willem Jan van Hoeve, Jean-Charles Régin
CP
2005
Springer
14 years 1 months ago
Towards an Optimal CNF Encoding of Boolean Cardinality Constraints
We consider the problem of encoding Boolean cardinality constraints in conjunctive normal form (CNF). Boolean cardinality constraints are formulae expressing that at most (resp. at...
Carsten Sinz