Per-spectral characterizations of graphs with extremal per-nullity
Per-spectral characterizations of graphs with extremal per-nullity
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具有极值零值的图的每光谱特征
DOI:
10.1016/j.laa.2015.06.018
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发表时间:
2015-11
影响因子:
1.1
通讯作者:
Zhang Heping
中科院分区:
文献类型:
--
作者:
Wu Tingzeng;Zhang Heping
A graph G is said to be determined by its permanental spectrum if any graph having the same permanental spectrum as G is isomorphic to G. In this paper, we introduce the permanental nullity of a graph, the multiplicity of the number zero in the permanental spectrum of a graph, to study graphs determined by their permanental spectra. First, we determine all graphs of order n whose permanental nullities are n− 2, n− 3, n− 4 and n− 5, respectively. Then, we show that all graphs with the permanental nullity n− 2, n− 3, or n− 5, and all non-bipartite graphs with the permanental nullity n− 4 are determined by their permanental spectra. In particular, we prove that the complete bipartite graphs are determined by their permanental spectra.
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影响因子:
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