Independence Polynomials of Bipartite Graphs
Independence Polynomials of Bipartite Graphs
复制标题
二部图的独立多项式
DOI:
10.1007/s40840-022-01326-9
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发表时间:
2022-06
期刊:
影响因子:
--
通讯作者:
Xia Hong
中科院分区:
文献类型:
--
作者:
Huihui Zhang;Xia Hong
Given a connected graphGwith vertex set, a subsetIofis called independent if there are no edges between any two vertices fromI. Letbe the number of independent sets with cardinalitykofGand let. The independence polynomial ofGis defined as, whereis called the Merrifield–Simmons index ofG. In this paper, some extremal problems on the coefficients of the independence polynomial of bipartite graphs are considered. Firstly, the second largestamong all bipartite graphs is determined, and the graph which simultaneously minimizes all coefficients ofI(G;x) among all bipartite graphs is characterized. Secondly, the largestamong all bipartite graphs with at least one cycle is determined, and the unique graph which minimizes all coefficients ofI(G;x) among all bipartite graphs with given matching number (resp. diameter at most four, connectivity) is characterized as well.
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DOI:
10.37236/7280
发表时间:
2018-02
期刊:
Electron. J. Comb.
影响因子:
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2005
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J. Comb. Theory A
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