Signed analogs of bipartite graphs

被引:21
|
作者
Zaslavsky, T [1 ]
机构
[1] SUNY Binghamton, Dept Math Sci, Binghamton, NY 13902 USA
基金
美国国家科学基金会;
关键词
D O I
10.1016/S0012-365X(96)00386-X
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
We characterize the edge-signed graphs in which every 'significant' positive closed walk (or combination of walks) has even length, under seven different criteria for significance, and also those edge-signed graphs whose double covering graph is bipartite. If the property of even length is generalized to positivity in a second edge signing, the characterizations generalize as well. We also characterize the edge-signed graphs with the smallest nontrivial chromatic numbers.
引用
收藏
页码:205 / 216
页数:12
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