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        CSP duality and trees of bounded pathwidth

        Author
        Carvalho, Catarina
        Dalmau, Víctor
        Krokhin, Andrei
        Attention
        2299/9618
        Abstract
        We study non-uniform constraint satisfaction problems definable in monadic Datalog stratified by the use of non-linearity. We show how such problems can be described in terms of homomorphism dualities involving trees of bounded pathwidth and in algebraic terms. For this, we introduce a new parameter for trees that closely approximates pathwidth and can be characterised via a hypergraph searching game.
        Publication date
        2010
        Published in
        Theoretical Computer Science
        Published version
        https://doi.org/10.1016/j.tcs.2010.05.016
        Other links
        http://hdl.handle.net/2299/9618
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