Asymptotics of trees with a prescribed degree sequence and applications
Asymptotics of trees with a prescribed degree sequence and applications
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具有规定度数序列的树的渐近性及其应用
DOI:
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发表时间:
2011
期刊:
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通讯作者:
M. Hannington
中科院分区:
文献类型:
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作者:
K. Poulsen;M. Hannington
Let t be a rooted tree and nbi(t) the number of nodes in t having i children. The degree sequence (ni(t),i≥0) of t satisfies ∑i≥0ni(t)=1+∑i≥0ini(t)=|t| , where |t| denotes the number of nodes in t. In this paper, we consider trees sampled uniformly among all plane trees having the same degree sequence s ; we write ℙs for the corresponding distribution. Let s(κ)=(ni(κ),i≥0) be a list of degree sequences indexed by κ corresponding to trees with size nκ→+∞ . We show that under some simple and natural hypotheses on (s(κ),κ>0) the trees sampled under ℙs(κ) converge to the Brownian continuum random tree after normalisation by nκ1/2 . Some applications concerning Galton–Watson trees and coalescence processes are provided.Copyright © 2012 Wiley Periodicals, Inc. Random Struct. Alg., 44, 290‐316, 2014