Bounds for the matching number and cyclomatic number of a signed graph in terms of rank

Bounds for the matching number and cyclomatic number of a signed graph in terms of rank
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有符号图的匹配数和圈数的界限

DOI:
10.1016/j.laa.2019.03.012
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发表时间:
2019-07
影响因子:
1.1
通讯作者:
Hong-Jian Lai
Hong-Jian Lai
中科院分区:
数学3区
文献类型:
--
作者:
Shengjie He;Rong-Xia Hao;Hong-Jian Lai

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一个带符号图(G,σ)是一个边带有符号的图,其中G是(G,σ)的基础图.设m(G),c(G)和r(G,σ)分别为(G,σ)的邻接矩阵的匹配数,圈数和秩.研究了符号图的秩、匹配数和圈数之间的关系,证明了2 m(G)− 2 c(G))≤ r(G,σ)≤ 2 m(G)+c(G).此外,符号图达到下界或上界分别进行了表征。
A signed graph (G, σ) is a graph with a sign attached to each of its edges, where G is the underlying graph of (G, σ). Let m (G), c (G) and r (G, σ) be the matching number, the cyclomatic number and the rank of the adjacency matrix of (G, σ), respectively. In this paper, we investigate the relation among the rank, the matching number and the cyclomatic number of a signed graph, and prove that 2 m (G)− 2 c (G))≤ r (G, σ)≤ 2 m (G)+ c (G). Furthermore, signed graphs reaching the lower bound or the upper bound are respectively characterized.
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