Some novel minimax results for perfect matchings of hexagonal systems

Some novel minimax results for perfect matchings of hexagonal systems
复制标题

六角形系统完美匹配的一些新颖的极小极大结果

DOI:
10.1016/j.dam.2022.06.017
复制
发表时间:
2020-09
影响因子:
1.1
通讯作者:
Heping Zhang
Heping Zhang
中科院分区:
数学3区
文献类型:
--
作者:
Xiangqian Zhou;Heping Zhang

文献摘要

参考文献

相似文献

图G$的完美匹配$M$的反强迫数是G$中删除使得子图具有唯一完美匹配$M$的最小边数,记为$af(G,M)$。当G$是平面二部图时,Lei等人建立了一个极大极小结果:对于G $的任意完美匹配M$,af(G,M)$等于G$的最大M$-交错圈数,其中任意两个圈在M$中不相交或仅在M$中的边相交;对于六角系统,最大反强迫数等于fries数。本文证明了对于六角系统H的每一个最大反强迫数为负1的完美匹配M,af(H,M)等于H的M-交错六边形的个数.进一步证明了六角系统H$有一个苯并菲作为好子图当且仅当$af(H,M)$对于$H$的每一个完美匹配$M$总是等于$H$的$M$-交错六边形的个数。
The anti-forcing number of a perfect matching $M$ of a graph $G$ is the minimum number of edges of $G$ whose deletion results in a subgraph with a unique perfect matching $M$, denoted by $af(G,M)$. When $G$ is a plane bipartite graph, Lei et al. established a minimax result: For any perfect matching $M$ of $G$, $af(G,M)$ equals the maximum number of $M$-alternating cycles of $G$ where any two either are disjoint or intersect only at edges in $M$; For a hexagonal system, the maximum anti-forcing number equals the fries number. In this paper we show that for every perfect matching $M$ of a hexagonal system $H$ with the maximum anti-forcing number or minus one, $af(H,M)$ equals the number of $M$-alternating hexagons of $H$. Further we show that a hexagonal system $H$ has a triphenylene as nice subgraph if and only $af(H,M)$ always equals the number of $M$-alternating hexagons of $H$ for every perfect matching $M$ of $H$.
DOI: 10.1039/ft9928801621
发表时间: 1992-03
期刊: Journal of the Chemical Society, Faraday Transactions
影响因子: --
作者:
P. Hansen;M. Zheng
通讯作者: P. Hansen;M. Zheng
DOI: 10.1016/0166-218x(95)00116-9
发表时间: 1997-02
期刊: Discret. Appl. Math.
影响因子: --
作者:
Xueliang Li
通讯作者: Xueliang Li
DOI: --
发表时间: 2007
期刊: --
影响因子: --
作者:
H. Deng
通讯作者: H. Deng
DOI: 10.1007/s10878-015-9986-3
发表时间: 2017-02
影响因子: 1
作者:
Deng Kai;Zhang Heping
通讯作者: Zhang Heping
DOI: --
发表时间: 2009-03
期刊: Australas. J Comb.
影响因子: --
作者:
P. Afshani;Hamed Hatami;E. Mahmoodian
通讯作者: P. Afshani;Hamed Hatami;E. Mahmoodian