QI Wu

collaborators

3 papers

math.CO2025

Improved bounds on the $H$ -rank of a mixed graph in terms of the matching number and fractional matching number

Qi Wu, Yong Lu

A mixed graph $G$ is obtained by orienting some edges of a graph $G$ , where $G$ is the underlying graph of $G$ . Let $r (G)$ be the $H$ -rank of $\…

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…

Improved bounds on the H-rank of a mixed graph in terms of the matching number and fractional matching number

The rank of a signed graph in terms of girth

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

Improved bounds on the $H$ -rank of a mixed graph in terms of the matching number and fractional matching number