arXiv subjects

Bor-Liang Chen

Publications and source records attributed to Bor-Liang Chen.

3 recordsLinked to original sources

arXiv2014

Equitable Coloring of Graphs with Intermediate Maximum Degree

If the vertices of a graph $G$ are colored with $k$ colors such that no adjacent vertices receive the same color and the sizes of any two color classes differ by at most one, then $G$ is said to be equitably $k$-colorable. Let $|G|$ denote the number of vertices of $G$ and $Δ=Δ(G)$ the maximum degree of a vertex in $G$. We prove that a graph $G$ of order at least 6 is equitably $Δ$-colorable if $G$ satisfies $(|G|+1)/3 \leq Δ< |G|/2$ and none of its components is a $K_{Δ+1}$.

math.CO↗

arXiv2013

A Common Generalization of the Theorems of Erdős-Ko-Rado and Hilton-Milner

Let $m$, $n$, and $k$ be integers satisfying $0 < k \leq n < 2k \leq m$. A family of sets $\mathcal{F}$ is called an $(m,n,k)$-intersecting family if $\binom{[n]}{k} \subseteq \mathcal{F} \subseteq \binom{[m]}{k}$ and any pair of members of $\mathcal{F}$ have nonempty intersection. Maximum $(m,k,k)$- and $(m,k+1,k)$-intersecting families are determined by the theorems of Erdős-Ko-Rado and Hilton-Milner, respectively. We determine the maximum families for the cases $n = 2k-1, 2k-2, 2k-3$, and $m$ sufficiently large.

math.CO↗

arXiv2009

Equitable coloring of interval graphs and products of graphs

We confirm the equitable $Δ$-coloring conjecture for interval graphs and establish the monotonicity of equitable colorability for them. We further obtain results on equitable colorability about square (or Cartesian) and cross (or direct) products of graphs.

math.CO↗