A LOWER BOUND ON COCHROMATIC NUMBER FOR LINE GRAPHS OF A KIND OF GRAPHS

被引:0
作者
Liu Xinsheng~1 Chen Xiang’en~1 Ou Lifeng~2 1 College of Mathematics and Information Science
机构
关键词
cochromatic number; edge cochromatic number; matching; star;
D O I
暂无
中图分类号
O157.5 [图论];
学科分类号
070104 ;
摘要
Erds,Gimbel and Straight (1990) conjectured that ifω(G)<5 and z(G)>3,then z(G)≥x(G)-2.But by using the concept of edge cochromatic number it is proved that if G is the line graph of a connected triangle-free graph withω(G)<5 and G≠K;,then z(G)≥x(G)- 2.
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页码:357 / 360
页数:4
相关论文
共 4 条
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  • [2] Graph Cocoloring and The Probabilistic Method. Michael M,,Bruce R. . 2002
  • [3] Chromatic number versus cochromatic number in graphs with bounded clique size. Erds P,,Gimbel J,Straight H J. European Journal of Combinatorics . 1990
  • [4] The cochromatic number of a graph. Lesniak L,,Straight H J. Ars Combinatoria . 1977