An extremal function for contractions of graphs

An extremal function for contractions of graphs
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图收缩的极值函数

DOI:
10.1017/s0305004100061521
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发表时间:
1984
影响因子:
0.8
通讯作者:
A. Thomason
A. Thomason
中科院分区:
数学2区
文献类型:
--
作者:
A. Thomason

文献摘要

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摘要通过>表示收缩的函数C(P)定义为正整数P≥4。最近,Kostochka表明P√(log P)是C(P)的正确顺序。
Abstract The function c(p) is defined for positive integers p ≥ 4 by where > denotes contraction. Random graph examples show In 1968 Mader showed that c(p) ≤ 8(p − 2) [log2 (p − 2)] and more recently Kostochka showed that p√(log p) is the correct order for c(p). We present a simple argument showing c(p) ≤ 2.68p √(log2p)(l + ο(l)).