On the maximum satisfiability of random formulas

  • Authors:
  • Dimitris Achlioptas;Assaf Naor;Yuval Peres

  • Affiliations:
  • U.C. Santa Cruz, Santa Cruz, CA;Courant Institute, NYU;U.C. Berkeley and Microsoft Research

  • Venue:
  • Journal of the ACM (JACM)
  • Year:
  • 2007

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Abstract

Say that a k-CNF a formula is p-satisfiable if there exists a truth assignment satisfying a fraction 1 − 2−k +p 2−k of its clauses (note that every k-CNF formula is 0-satisfiable). Let Fk(n, m) denote a random k-CNF formula on n variables with m clauses. For every k≥2 and every r0 we determine p and δ=δ(k)=O(k2−k/2) such that with probability tending to 1 as n→∞, a random k-CNF formula Fk(n, rn) is p-satisfiable but not (p+δ)-satisfiable.