Distance Graphs with Finite Chromatic Number
Distance Graphs with Finite Chromatic Number
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有限色数距离图
DOI:
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发表时间:
2002
期刊:
影响因子:
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通讯作者:
M. Voigt
中科院分区:
文献类型:
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作者:
I. Ruzsa;Z. Tuza;M. Voigt
The distance graph G(D) with distance set D={d1, d2, ?} has the set Z of integers as vertex set, with two vertices i, j?Z adjacent if and only if |i?j|?D. We prove that the chromatic number of G(D) is finite whenever inf{di+1/di}>1 and that every growth speed smaller than this admits a distance set D with infinite-chromatic G(D).