Weige Xi

activity

20162026

most citedMerging the A- and Q-spectral theories for digraphs

3 citations · 4 across the 14 of their papers we have counts for

collaborators

Showing 2025Show all

3 papers · 1 filter

math.CO2025

Spectral extremal problems for $(a, b, k)$ -critical and fractional $(a, b, k)$ -critical graphs

Zengzhao Xu, Ligong Wang, Weige Xi

A factor of a graph is essentially a specific type spanning subgraph. The study of characterizing the existence of $[a, b]$ -factors based on eigenvalue conditions can be traced bac…

math.CO2025

Spectral radius and size conditions for fractional $(a, b, m)$ -covered graphs

Zengzhao Xu, Ligong Wang, Weige Xi

A fractional $(a, b, m)$ -covered graph is a generalization of the concept of a fractional $[a, b]$ -covered graph. For any $H \subseteq G$ with edge set $∣ E (H) ∣ = m$ , if there exists a…

math.CO2025

Ordering digraphs with maximum outdegrees by their $A_{α}$ spectral radius

Zengzhao Xu, Weige Xi, Ligong Wang

Let $G$ be a strongly connected digraph with $n$ vertices and $m$ arcs. For any real $α \in [0, 1]$ , the $A_{α}$ matrix of a digraph $G$ is defined as $A_{α} (G) = α D (G) + (1 - α) A (G),$ where…

Spectral extremal problems for (a,b,k)-critical and fractional (a,b,k)-critical graphs

Spectral radius and size conditions for fractional (a,b,m)-covered graphs

Ordering digraphs with maximum outdegrees by their Aα​ spectral radius

Spectral extremal problems for $(a, b, k)$ -critical and fractional $(a, b, k)$ -critical graphs

Spectral radius and size conditions for fractional $(a, b, m)$ -covered graphs

Ordering digraphs with maximum outdegrees by their $A_{α}$ spectral radius