Factors in random graphs

  • Authors:
  • Anders Johansson;Jeff Kahn;Van Vu

  • Affiliations:
  • Department of Mathematics, Natural and Computer Sciences, University of Gävle, Sweden;Department of Mathematics, Rutgers University, Piscataway, New Jersey 08854;Department of Mathematics, Rutgers University, Piscataway, New Jersey 08854

  • Venue:
  • Random Structures & Algorithms
  • Year:
  • 2008

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Abstract

Let H be a fixed graph on v vertices. For ann-vertex graph G with n divisible by v,an H-factor of G is a collection of n-vcopies of H whose vertex sets partition V(G).In this work, we consider the thresholdthH(n) of the property thatan Erdõs-Rényi random graph (on n points)contains an H-factor. Our results determinethH(n) for all strictlybalanced H.The method here extends with no difficulty to hypergraphs. As acorollary, we obtain the threshold for a perfect matching in randomk-uniform hypergraph, solving the well-known "Shamir'sproblem." © 2008 Wiley Periodicals, Inc. Random Struct. Alg.,2008