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Asymptotics of trees with a prescribed degree sequence and applications
Authors:Nicolas Broutin  Jean‐François Marckert
Institution:Projet Algorithms, Inria Rocquencourt, Domaine de Voluceau, , 78153 Le Chesnay, FrancePartially supported by ANR Boole (ANR‐09‐BLAN‐0011).
Abstract:Let t be a rooted tree and nbi(t) the number of nodes in t having i children. The degree sequence urn:x-wiley::media:rsa20463:rsa20463-math-0001 of t satisfies urn:x-wiley::media:rsa20463:rsa20463-math-0002, where urn:x-wiley::media:rsa20463:rsa20463-math-0003 denotes the number of nodes in t. In this paper, we consider trees sampled uniformly among all plane trees having the same degree sequence urn:x-wiley::media:rsa20463:rsa20463-math-0004; we write urn:x-wiley::media:rsa20463:rsa20463-math-0005 for the corresponding distribution. Let urn:x-wiley::media:rsa20463:rsa20463-math-0006 be a list of degree sequences indexed by κ corresponding to trees with size urn:x-wiley::media:rsa20463:rsa20463-math-0007. We show that under some simple and natural hypotheses on urn:x-wiley::media:rsa20463:rsa20463-math-0008 the trees sampled under urn:x-wiley::media:rsa20463:rsa20463-math-0009 converge to the Brownian continuum random tree after normalisation by urn:x-wiley::media:rsa20463:rsa20463-math-0010. Some applications concerning Galton–Watson trees and coalescence processes are provided.Copyright © 2012 Wiley Periodicals, Inc. Random Struct. Alg., 44, 290‐316, 2014
Keywords:continuum random tree  Brownian excursion  real tree  invariance principle  coalescence
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