The nullity of a graph is defined to be the multiplicity of the eigen-value zero in the spectrum of the adjacency matrix of the graph. In this paper, we obtain the nullity set of bipartite graphs of order n, and characterize the bipartite graphs with nullity n - 4 and the regular bipartite graphs with nullity n - 6. (C) 2009 Elsevier Inc. All rights reserved.
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Xinjiang Normal Univ, Dept Math, Urumqi 830054, Xinjiang, Peoples R China
Jiangsu Teachers Univ Technol, Dept Math, Changzhou 213001, Jiangsu, Peoples R ChinaXinjiang Normal Univ, Dept Math, Urumqi 830054, Xinjiang, Peoples R China
Wang, Guoping
Zhu, Fei
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Xinjiang Normal Univ, Dept Math, Urumqi 830054, Xinjiang, Peoples R ChinaXinjiang Normal Univ, Dept Math, Urumqi 830054, Xinjiang, Peoples R China
Zhu, Fei
Bian, Hong
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Xinjiang Normal Univ, Dept Math, Urumqi 830054, Xinjiang, Peoples R ChinaXinjiang Normal Univ, Dept Math, Urumqi 830054, Xinjiang, Peoples R China