Promises Make Finite (Constraint Satisfaction) Problems Infinitary

Libor Barto

doi:10.1109/lics.2019.8785671

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arXiv · 1909.04878

Promises Make Finite (Constraint Satisfaction) Problems Infinitary

Libor Barto

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Abstract

The fixed template Promise Constraint Satisfaction Problem (PCSP) is a recently proposed significant generalization of the fixed template CSP, which includes approximation variants of satisfiability and graph coloring problems. All the currently known tractable (i.e., solvable in polynomial time) PCSPs over finite templates can be reduced, in a certain natural way, to tractable CSPs. However, such CSPs are often over infinite domains. We show that the infinity is in fact necessary by proving that a specific finite-domain PCSP, namely (1-in-3-SAT, Not-All-Equal-3-SAT), cannot be naturally reduced to a tractable finite-domain CSP, unless P=NP.

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Libor Barto. 2019-09-11. Promises Make Finite (Constraint Satisfaction) Problems Infinitary. https://doi.org/10.1109/lics.2019.8785671

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