Journal of the
Korean Mathematical Society JKMS

We call the bipartite graph $G$ is normal provided the reduced adjacency matrix $A$ of $G$ is normal. In this paper we give graph representations of normal matrices. In addition we shall have the characterization of signed bipartite normal graphs.

Keywords: normal matrix, bipartite graph, reduced adjacency matrix, co-degree

MSC numbers: Primary 05A15, 65F25