Interval cyclic edge-colorings of graphs

TL;DR

This paper studies a special type of edge-coloring called interval cyclic coloring, exploring its properties, bounds for specific graph classes, and methods to construct graphs that do not admit such colorings.

Contribution

It introduces and analyzes the concept of interval cyclic edge-colorings, providing bounds for the coloring parameters and methods to construct non-colorable graphs.

Findings

For triangle-free graphs, $W_c(G) \

bounds on $w_c(G)$ and $W_c(G)$ for various graph classes

Abstract

A proper edge-coloring of a graph $G$ with colors $1,\ldots,t$ is called an \emph{interval cyclic $t$-coloring} if all colors are used, and the edges incident to each vertex $v\in V(G)$ are colored by $d_{G}(v)$ consecutive colors modulo $t$, where $d_{G}(v)$ is the degree of a vertex $v$ in $G$. A graph $G$ is \emph{interval cyclically colorable} if it has an interval cyclic $t$-coloring for some positive integer $t$. The set of all interval cyclically colorable graphs is denoted by $\mathfrak{N}_{c}$. For a graph $G\in \mathfrak{N}_{c}$, the least and the greatest values of $t$ for which it has an interval cyclic $t$-coloring are denoted by $w_{c}(G)$ and $W_{c}(G)$, respectively. In this paper we investigate some properties of interval cyclic colorings. In particular, we prove that if $G$ is a triangle-free graph with at least two vertices and $G\in \mathfrak{N}_{c}$, then $W_{c}(G)\leq \vert V(G)\vert +\Delta(G)-2$. We also obtain bounds on $w_{c}(G)$ and $W_{c}(G)$ for various classes of graphs. Finally, we give some methods for constructing of interval cyclically non-colorable graphs.