Relationship between the rank and the matching number of a graph

Relationship between the rank and the matching number of a graph
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图的排名与匹配数之间的关系

DOI:
10.1016/j.amc.2019.02.055
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发表时间:
2019-08
影响因子:
4
通讯作者:
Luo Xiaobing
Luo Xiaobing
中科院分区:
数学2区
文献类型:
--
作者:
Feng Zhimin;Huang Jing;Li Shuchao;Luo Xiaobing

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给定一个简单图G,设A(G)是它的邻接矩阵,α′(G)是它的匹配数. G的秩,记作r(G),是指A(G)的秩。本文研究了图的秩与匹配数之间的一些关系。首先证明了− 2 d(G)<$r(G)− 2 α′(G)<$No,其中d(G)和No分别是G的圈空间维数和奇圈数.其次,确定了r(G)− α′(G)和r(G)/α′(G)的精确下界.所有相应的极图的特征,分别。
Given a simple graph G, let A (G) be its adjacency matrix and α′(G) be its matching number. The rank of G, written as r (G), refers to the rank of A (G). In this paper, some relations between the rank and the matching number of a graph are studied. Firstly, it is proved that− 2 d (G)⩽ r (G)− 2 α′(G)⩽ N o, where d (G) and N o are, respectively, the dimension of cycle space and the number of odd cycles of G. Secondly, sharp lower bounds on both r (G)− α′(G) and r (G)/α′(G) are determined. All the corresponding extremal graphs are characterized, respectively.
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