2 papers
math.CO2014
The spectral radius of the square of graphs
Yi-Zheng Fan, Long Wang
The square of a connected graph is obtained from by adding an edge between every pair of vertices at distance . In this paper we give some upper or lower bounds for the…
math.CO2013
The triangle-free graphs with rank 6
Long Wang, Yi-Zheng Fan, Yi Wang
The rank of a graph G is defined to be the rank of its adjacency matrix A(G). In this paper we characterize all connected triangle-free graphs with rank 6.