Abstract

A mixed graph is obtained by orienting some edges of a simple graph. The positive inertia index of a mixed graph is defined as the number of positive eigenvalues of its Hermitian adjacency matrix, including multiplicities. In this paper, we study the positive inertia indices of mixed graphs. Our main results provide a characterization of mixed graphs with positive inertia index 1. As an application, some classes of mixed graphs determined by their H-spectra are fixed.

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