Connected equitably $\Delta$-colorable realizations with $k$-factors
Abstract
A graph is said to be equitably -colorable if its vertices can be partitioned into independent sets that pairwise differ in size by at most one. Chen, Lih, and Wu conjectured that every connected graph with maximum degree has an equitable coloring with colors, except when is complete, an odd cycle, or a balanced bipartite graph with odd sized partitions. Suppose is a connected graph with a -factor (a regular spanning subgraph) such that is not complete, a -factor, nor an odd cycle. When we demonstrate that there is a connected edge-connected equitably -colorable graph with a -factor such that . If we drop the requirement that , then we can say more. Considering the non-increasing degree sequence of where for all vertices of , we call the strong index of . For , we can show that for every we can find a connected edge-connected equitably -colorable realization of that has a -factor. In a third theorem we show that if , then some realization of has a -factor. Together, these three theorems allow us to prove that for all , there is a connected equitably -colorable realization of with a -factor. Thus, giving support to the validity of the Chen-Lih-Wu Conjecture.
Cite
@article{arxiv.2503.00222,
title = {Connected equitably $\Delta$-colorable realizations with $k$-factors},
author = {James M. Shook},
journal= {arXiv preprint arXiv:2503.00222},
year = {2025}
}