Some novel minimax results for perfect matchings of hexagonal systems
Some novel minimax results for perfect matchings of hexagonal systems
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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
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发表时间:
2020-09
影响因子:
1.1
通讯作者:
Heping Zhang
中科院分区:
文献类型:
--
作者:
Xiangqian Zhou;Heping Zhang
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 $H$.
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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:
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发表时间:
1997-02
期刊:
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影响因子:
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作者:
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通讯作者:
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DOI:
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发表时间:
2007
期刊:
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影响因子:
--
作者:
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通讯作者:
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影响因子:
1
作者:
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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