Exact Algorithms for Constraint Satisfaction Problems

By (author) Robin Moser

Book cover: Exact Algorithms for Constraint Satisfaction Problems

Extent: 215 pages

Publisher: Logos Verlag Berlin

Subjects: Technical Sciences: Computer Science, Engineering, IT, & Math

Language: English

Paperback (Published)

(March 2013)

ISBN: 9783832533694

5.71 x 8.27 inches

Price: $56.00

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The Boolean satisfiability problem (SAT) and its generalization to variables of higher arities – constraint satisfaction problems (CSP) – can arguably be called the most “natural” of all NP-complete problems. The present work is concerned with their algorithmic treatment. It consists of two parts. The first part investigates CSPs for which satisfiability follows from the famous Lovasz Local Lemma. Since its discovery in 1975 by Paul Erdos and Laszlo Lovasz, it has been known that CSPs without dense spots of interdependent constraints always admit a satisfying assignment. However, an iterative procedure to discover such an assignment was not available. We refine earlier attempts at making the Local Lemma algorithmic and present a polynomial time algorithm which is able to make almost all known applications constructive. In the second part, we leave behind the class of polynomial time tractable problems and instead investigate the randomized exponential time algorithm devised and analyzed by Uwe Schoning in 1999, which solves arbitrary clause satisfaction problems. Besides some new interesting perspectives on the algorithm, the main contribution of this part consists of a refinement of earlier approaches at derandomizing Schoning’s algorithm. We present a deterministic variant which losslessly reaches the performance of the randomized original.

  • By (author) Robin Moser

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