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Phys. Rev. E 78, 040101(R) (2008) [4 pages]

Exhaustive enumeration unveils clustering and freezing in the random 3-satisfiability problem

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John Ardelius1,* and Lenka Zdeborová2,3,†
1Swedish Institute of Computer Science SICS, SE-164 24, Kista, Sweden
2Université Paris-Sud, LPTMS, UMR8626, Université Paris-Sud 91405 Orsay cedex, France
3CNRS, LPTMS, UMR8626, Université Paris-Sud 91405 Orsay cedex, France

Received 4 April 2008; published 2 October 2008

We study geometrical properties of the complete set of solutions of the random 3-satisfiability problem. We show that even for moderate system sizes the number of clusters corresponds surprisingly well with the theoretic asymptotic prediction. We locate the freezing transition in the space of solutions, which has been conjectured to be relevant in explaining the onset of computational hardness in random constraint satisfaction problems.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevE.78.040101
DOI:
10.1103/PhysRevE.78.040101
PACS:
05.40.−a, 89.20.Ff, 75.10.Nr, 89.70.Eg

*john@sics.se

zdeborov@lptms.u-psud.fr