Yang Yu

collaborators

2 papers

math.CO2023

A spectral radius condition for a graph to have $(a, b)$ -parity factors

Junjie Wang, Yang Yu, Jianbiao Hu +1

Let $a, b$ be two positive integers such that $a \leq b$ and $a \equiv b$ (mod $2$ ). We say that a graph $G$ has an $(a, b)$ -parity factor if $G$ has a spanning subgraph $F$ such that…

math.CO2022

Sharp Bounds and Precise Values for the $N_{i}$ -Chromatic Number of Graphs

Yangfan Yu, Yuefang Sun

Let $G$ be a connected undirected graph.~A vertex coloring $f$ of $G$ is an $N_{i}$ -vertex coloring if for each vertex $x$ in $G$ , the number of different colors assigned to $N_{G} (x)$ …

A spectral radius condition for a graph to have (a,b)-parity factors

Sharp Bounds and Precise Values for the Ni​-Chromatic Number of Graphs

A spectral radius condition for a graph to have $(a, b)$ -parity factors

Sharp Bounds and Precise Values for the $N_{i}$ -Chromatic Number of Graphs