WU Tingzeng, FENG Lihua, MA Haicheng. On the characteristic polynomials of graphs with nullity n-4[J]. Acta Scientiarum Naturalium Universitatis SunYatseni, 2016,55(6):57-63.
WU Tingzeng, FENG Lihua, MA Haicheng. On the characteristic polynomials of graphs with nullity n-4[J]. Acta Scientiarum Naturalium Universitatis SunYatseni, 2016,55(6):57-63.DOI:
n 个顶点的图G的零度等于 n 减去其邻接矩阵的秩。计算了零度为 n-4 的所有图的特征多项式。特别地
证明了许多零度为 n-4 的图是谱唯一确定的
并构造了许多对零度为 n-4 的同谱图。
Abstract
The nullity of a graph is the multiplicity of zeroes in its adjacency spectrum. And the nullity of a graph G with n vertices equals to n minus the rank of adjacency matrix of G. The characteristic polynomials of graphs with nullity n-4 is computed. In particular
it is shown that some graphs with nullity n-4 are determined by their spectra. And some pairs of cospectral graphs with nullity n-4 are presented.