QI Wu

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20212026

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math.CO2021

The rank of a signed graph in terms of girth

Yong Lu, Qi Wu

Let $Γ = (G, σ)$ be a signed graph and $A (G, σ)$ be its adjacency matrix. Denote by $g r (G)$ the girth of $G$ , which is the length of the shortest cycle in $G$ . Let $r (G, σ)$ be the rank…

math.CO2021

Inertia indices of a complex unit gain graph in terms of matching number

Yong Lu, Qi Wu

A complex unit gain graph is a triple $φ = (G, T, φ)$ (or $G^{φ}$ for short) consisting of a simple graph $G$ , as the underlying graph of $G^{φ}$ , the set of unit complex number…