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Related papers: Circular chromatic index of small graphs

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The total chromatic number, $\chi''(G)$ is the minimum number of colors which need to be assigned to obtain a total coloring of the graph $G$. The Total Coloring Conjecture (TCC) made independently by Behzad and Vizing that for any graph,…

Combinatorics · Mathematics 2021-11-01 R. Navaneeth , J. Geetha , K. Somasundaram , Hung-Lin Fu

The strong chromatic index of a multigraph is the minimum $k$ such that the edge set can be $k$-colored requiring that each color class induces a matching. We verify a conjecture of Faudree, Gy\'{a}rf\'{a}s, Schelp and Tuza, showing that…

Combinatorics · Mathematics 2015-08-03 A. V. Kostochka , X. Li , W. Ruksasakchai , M. Santana , T. Wang , G. Yu

Reed conjectured that for every epsilon>0 and Delta there exists g such that the fractional total chromatic number of a graph with maximum degree Delta and girth at least g is at most Delta+1+epsilon. We prove the conjecture for Delta=3 and…

Combinatorics · Mathematics 2010-09-30 Tomas Kaiser , Andrew King , Daniel Kral

We study the class of simple graphs $\mathcal{G}^*$ for which every pair of distinct odd cycles intersect in at most one edge. We give a structural characterization of the graphs in $\mathcal{G}^*$ and prove that every $G \in \mathcal{G}^*$…

Combinatorics · Mathematics 2017-11-21 Jessica McDonald , Gregory J. Puleo

A number of famous results about triangle-free graphs determine the maximum chromatic number of graphs of order n with minimum degree greater than n/3. In this note these results are extended to Kr-free graphs.

Combinatorics · Mathematics 2010-01-14 Vladimir Nikiforov

A proper edge coloring of a graph without any bichromatic cycles is said to be an acyclic edge coloring of the graph. The acyclic chromatic index of a graph $G$ denoted by $a'(G)$, is the minimum integer $k$ such that $G$ has an acyclic…

Combinatorics · Mathematics 2026-04-01 Nevil Anto , Manu Basavaraju , Shashanka Kulamarva

A strong edge-coloring of a graph $G$ is an edge-coloring such that any two edges on a path of length three receive distinct colors. We denote the strong chromatic index by $\chi_{s}'(G)$ which is the minimum number of colors that allow a…

Combinatorics · Mathematics 2018-01-23 Baochen Zhang , Yulin Chang , Jie Hu , Meijie Ma , Donglei Yang

An acyclic edge coloring of a graph $G$ is a proper edge coloring such that every cycle is colored with at least three colors. The acyclic chromatic index $\chiup_{a}'(G)$ of a graph $G$ is the least number of colors in an acyclic edge…

Combinatorics · Mathematics 2018-02-20 Tao Wang , Yaqiong Zhang

An acyclic edge coloring of a graph $G$ is a proper edge coloring such that no bichromatic cycles are produced. The acyclic chromatic index $a'(G)$ of $G$ is the smallest integer $k$ such that $G$ has an acyclic edge coloring using $k$…

Combinatorics · Mathematics 2012-06-01 Weifan Wang , Qiaojun Shu , Yiqiao Wang

An $acyclic$ edge coloring of a graph is a proper edge coloring such that there are no bichromatic cycles. The \emph{acyclic chromatic index} of a graph is the minimum number k such that there is an acyclic edge coloring using k colors and…

Discrete Mathematics · Computer Science 2009-08-18 Manu Basavaraju , L. Sunil Chandran

Let $G$ be a simple graph with maximum degree $\Delta(G)$. A subgraph $H$ of $G$ is overfull if $|E(H)|>\Delta(G)\lfloor |V(H)|/2 \rfloor$. Chetwynd and Hilton in 1985 conjectured that a graph $G$ with $\Delta(G)>|V(G)|/3$ has chromatic…

Combinatorics · Mathematics 2021-07-20 Michael J. Plantholt , Songling Shan

A strong edge coloring of a graph is a proper edge coloring in which every color class is an induced matching. The strong chromatic index $\chi_s'(G)$ of a graph $G$ is the minimum number of colors in a strong edge coloring of $G$. Let…

Combinatorics · Mathematics 2018-02-20 Tao Wang , Xiaodan Zhao

A graph is pseudo-outerplanar if each of its blocks has an embedding in the plane so that the vertices lie on a fixed circle and the edges lie inside the disk of this circle with each of them crossing at most one another. In this paper, the…

Combinatorics · Mathematics 2011-08-26 Xin Zhang , Guizhen Liu

An injective colouring of a graph is a colouring in which every two vertices sharing a common neighbour receive a different colour. Chen, Hahn, Raspaud and Wang conjectured that every planar graph of maximum degree $\Delta \ge 3$ admits an…

Combinatorics · Mathematics 2024-12-16 Matias Daneels , Jan Goedgebeur , Jarne Renders

An acyclic edge coloring of a graph $G$ is a proper edge coloring such that no bichromatic cycles are produced. The acyclic chromatic index $a'(G)$ of $G$ is the smallest integer $k$ such that $G$ has an acyclic edge coloring using $k$…

Combinatorics · Mathematics 2012-09-13 Wang Weifan , Shu Qiaojun , Wang Yiqiao

We determine (partly by computer search) the chromatic index (edge-chromatic number) of many strongly regular graphs (SRGs), including the SRGs of degree $k \leq 18$ and their complements, the Latin square graphs and their complements, and…

Combinatorics · Mathematics 2025-11-10 Sebastian M. Cioaba , Krystal Guo , Willem H. Haemers

The "clustered chromatic number" of a class of graphs is the minimum integer $k$ such that for some integer $c$ every graph in the class is $k$-colourable with monochromatic components of size at most $c$. We prove that for every graph $H$,…

Combinatorics · Mathematics 2020-02-17 Sergey Norin , Alex Scott , Paul Seymour , David R. Wood

A strong $k$-edge-coloring of a graph G is an edge-coloring with $k$ colors in which every color class is an induced matching. The strong chromatic index of $G$, denoted by $\chi'_{s}(G)$, is the minimum $k$ for which $G$ has a strong…

Combinatorics · Mathematics 2018-09-11 Tianjiao Dai , Guanghui Wang , Donglei Yang , Gexin Yu

The $\!{}\bmod k$ chromatic index of a graph $G$ is the minimum number of colors needed to color the edges of $G$ in a way that the subgraph spanned by the edges of each color has all degrees congruent to $1\!\!\pmod k$. Recently, the…

Combinatorics · Mathematics 2023-02-28 Fábio Botler , Lucas Colucci , Yoshiharu Kohayakawa

The star chromatic index of a multigraph $G$, denoted $\chi'_{st}(G)$, is the minimum number of colors needed to properly color the edges of $G$ such that no path or cycle of length four is bicolored. We survey the results of determining…

Combinatorics · Mathematics 2020-09-18 Hui Lei , Yongtang Shi