The probability that a random multigraph is simple

  • Authors:
  • Svante Janson

  • Affiliations:
  • Department of mathematics, uppsala university, po box 480, se-751 06 uppsala, sweden (e-mail: svante.janson@math.uu.se, http://www.math.uu.se/~svante/

  • Venue:
  • Combinatorics, Probability and Computing
  • Year:
  • 2009

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Abstract

Consider a random multigraph G* with given vertex degrees d1,…,dn, constructed by the configuration model. We show that, asymptotically for a sequence of such multigraphs with the number of edges , the probability that the multigraph is simple stays away from 0 if and only if . This was previously known only under extra assumptions on the maximum degree maxidi. We also give an asymptotic formula for this probability, extending previous results by several authors.