Complexity of Counting CSP with Complex Weights

Jin-Yi Cai; Xi Chen

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arXiv · 1111.2384

Complexity of Counting CSP with Complex Weights

Jin-Yi Cai·Xi Chen

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Abstract

We give a complexity dichotomy theorem for the counting Constraint Satisfaction Problem (#CSP in short) with complex weights. To this end, we give three conditions for its tractability. Let F be any finite set of complex-valued functions, then we prove that #CSP(F) is solvable in polynomial time if all three conditions are satisfied; and is #P-hard otherwise. Our complexity dichotomy generalizes a long series of important results on counting problems: (a) the problem of counting graph homomorphisms is the special case when there is a single symmetric binary function in F; (b) the problem of counting directed graph homomorphisms is the special case when there is a single not-necessarily-symmetric binary function in F; and (c) the standard form of #CSP is when all functions in F take values in {0,1}.

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BibTeX RIS

Jin-Yi Cai, Xi Chen. 2011-11-10. Complexity of Counting CSP with Complex Weights. https://arxiv.org/abs/1111.2384

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