A Probabilistic Proof of an Asymptotic Formula for the Number of Labelled Regular Graphs

B. Bollobás

Published 1980 in European journal of combinatorics (Print)

ABSTRACT

Let Δ and n be natural numbers such that Δn = 2m is even and Δ ⩽ (2 log n )1/2 - 1. Then as n →, the number of labelled Δ-regular graphs on n vertices is asymptotic to e − λ − λ 2 ( 2 m ) ! m ! 2 m ( Δ ! ) m where λ = (Δ -1)/2. As a consequence of the method we determine the asymptotic distribution of the number of short cycles in graphs with a given degree sequence, and give analogous formulae for hypergraphs.

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