Carvalho, C. and Dalmau, V. and Krokhin, A. (2008) 'Caterpillar duality for constraint satisfaction problems.', in Logic in computer science : 23rd Annual IEEE Symposium, LICS 2008, 24-27 June 2008, Pittsburgh, PA ; proceedings. Washington D.C.: IEEE, 307 -316 .
The study of constraint satisfaction problems definable in various fragments of Datalog has recently gained considerable importance. We consider constraint satisfaction problems that are definable in the smallest natural recursive fragment of Datalog - monadic linear Datalog with at most one EDB per rule. We give combinatorial and algebraic characterisations of such problems, in terms of caterpillar dualities and lattice operations, respectively. We then apply our results to study graph H-colouring problems.
|Item Type:||Book chapter|
|Keywords:||Constraint satisfaction problem, Homomorphism, Duality, Caterpillar structures, Datalog.|
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|Publisher Web site:||http://dx.doi.org/10.1109/LICS.2008.19|
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|Record Created:||29 Mar 2010 15:20|
|Last Modified:||08 Nov 2010 09:49|
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