Asymptotic enumeration of sparse graphs with a minimum degree constraint

  • Authors:
  • Boris Pittel;Nicholas C. Wormald

  • Affiliations:
  • Department of Mathematics, Ohio State University, Columbus, OH;Department of Combinatorics and Optimization, University of Waterloo, Waterloo ON, Canada N2L 3G1 and Department of Mathematics and Statistics, University of Melbourne VIC 3010, Australia

  • Venue:
  • Journal of Combinatorial Theory Series A
  • Year:
  • 2003

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Abstract

We derive an asymptotic formula for the number of graphs with n vertices all of degree at least k, and m edges, with k fixed. This is done by summing the asymptotic formula for the number of graphs with a given degree sequence, all degrees at least k. This approach requires analysis of a set of independent truncated Poisson variables, which approximate the degree sequence of a random graph chosen uniformly at random among all graphs with n vertices, m edges, and a minimum degree at least k. Our main result generalizes a result of Bender, Canfield and McKay and of Korshunov, who treated the case k = 1 using different methods.