Yonglei Chen

activity

20222026

collaborators

3 papers

math.CO2026

Decomposing multigraphs into two Class I subgraphs with prescribed maximum degrees

Yonglei Chen, Yan Cao

Let $G$ be a finite loopless multigraph with maximum degree $Δ$ and $χ^{'} (G) = Δ + k$ , where $k \geq 0$ . We prove that for every pair of positive integers $p, q$ satisfying $$p+q=Δ+k\qquad\t…

math.CO2025

Short Brooms in Edge-chromatic Critical Graphs

Yonglei Chen, Yan Cao

This paper studies short brooms in edge-chromatic critical graphs. We prove that for any short broom in a $Δ$ -critical graph, at most one color is missing at more than one vertex.…

math.CO2022

Spectral radius conditions for fractional $[a, b]$ -covered graphs

Junjie Wang, Jiaxin Zheng, Yonglei Chen

A graph $G$ is called fractional $[a, b]$ -covered if for every edge $e$ of $G$ there is a fractional $[a, b]$ -factor with the indicator function $h$ such that $h (e) = 1$ . In this paper…

Decomposing multigraphs into two Class I subgraphs with prescribed maximum degrees

Short Brooms in Edge-chromatic Critical Graphs

Spectral radius conditions for fractional [a,b]-covered graphs

Spectral radius conditions for fractional $[a, b]$ -covered graphs