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The mean chromatic number of paths and cycles

✍ Scribed by Martin Anthony; Norman Biggs


Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
245 KB
Volume
120
Category
Article
ISSN
0012-365X

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✦ Synopsis


The mean chromatic number of a graph is defined. This is a measure of the expected performance of the greedy vertex-colouring algorithm when each ordering of the vertices is equally likely. In this note, we analyse the asymptotic behaviour of the mean chromatic number for the paths and even cycles, using generating function techniques.


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We prove that, for any pair of integers k, l 1, there exists an integer N(k, l ) such that every graph with chromatic number at least N(k, l ) contains either K k or an induced odd cycle of length at least 5 or an induced cycle of length at least l.

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The mean chromatic number of a graph is a measure of the expected performance of the greedy vertex-colouring algorithm when each ordering of the vertices is equally likely. Some results on the value of the mean chromatic number and its asymptotic behaviour are presented.

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## Abstract In 1966 ErdΓΆs and Hajnal proved that the chromatic number of graphs whose odd cycles have lengths at most __l__ is at most __l__+1. Similarly, in 1992 GyΓ‘rfΓ‘s proved that the chromatic number of graphs which have at most __k__ odd cycle lengths is at most 2__k__+2 which was originally c