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A packing $k$-coloring of a graph $G$ is a partition of $V(G)$ into $k$ disjoint non-empty classes $V_1, \dots, V_k$, such that if $u,v \in V_i$, $i\in [k]$, $u\ne v$, then the distance between $u$ and $v$ is greater than $i$. The packing…

Combinatorics · Mathematics 2025-05-12 Zahra Hamed-Labbafian , Mostafa Tavakoli , Mojgan Afkhami , Sandi Klavžar

The curling number of a graph G is defined as the number of times an element in the degree sequence of G appears the maximum. Graph colouring is an assignment of colours, labels or weights to the vertices or edges of a graph. A colouring…

General Mathematics · Mathematics 2018-04-06 C. Susanth , N. K. Sudev , S. J. Kalayathankal

A proper vertex coloring of a graph is said to be locally identifying if the sets of colors in the closed neighborhood of any two adjacent non-twin vertices are distinct. The lid-chromatic number of a graph is the minimum number of colors…

Combinatorics · Mathematics 2013-07-11 Daniel Gonçalves , Aline Parreau , Alexandre Pinlou

Hadwiger and Haj\'{o}s conjectured that for every positive integer $t$, $K_{t+1}$-minor free graphs and $K_{t+1}$-topological minor free graphs are properly $t$-colorable, respectively. Clustered coloring version of these two conjectures…

Combinatorics · Mathematics 2022-12-06 Chun-Hung Liu

Esperet and Joret proved that planar graphs with bounded maximum degree are 3-colorable with bounded clustering. Liu and Wood asked whether the conclusion holds with the assumption of the bounded maximum degree replaced by assuming that no…

Combinatorics · Mathematics 2023-06-19 Zdeněk Dvořák

Recent results show that several important graph classes can be embedded as subgraphs of strong products of simpler graphs classes (paths, small cliques, or graphs of bounded treewidth). This paper develops general techniques to bound the…

Combinatorics · Mathematics 2024-09-13 Louis Esperet , David R. Wood

A packing $k$-coloring of a graph $G$ is a partition of $V(G)$ into sets $V_1,\ldots,V_k$ such that for each $1\leq i\leq k$ the distance between any two distinct $x,y\in V_i$ is at least $i+1$. The packing chromatic number, $\chi_p(G)$, of…

Combinatorics · Mathematics 2018-10-09 József Balogh , Alexandr Kostochka , Xujun Liu

The smallest integer $k$ needed for the assignment of colors to the elements so that the coloring is proper (vertices and edges) is called the total chromatic number of a graph. Vizing and Behzed conjectured that the total coloring can be…

Combinatorics · Mathematics 2018-12-17 Geetha Jayabalan , Narayanan N , K Somasundaram

The dichromatic number of a digraph is the minimum integer $k$ such that it admits a $k$-dicolouring, i.e. a partition of its vertices into $k$ acyclic subdigraphs. We say that a digraph $D$ is a super-orientation of an undirected graph $G$…

Combinatorics · Mathematics 2025-02-27 Stéphane Bessy , Frédéric Havet , Lucas Picasarri-Arrieta

For a colour cluster $\C =(\mathcal{C}_1,\mathcal{C}_2, \mathcal{C}_3,\dots,\mathcal{C}_\ell)$, $\mathcal{C}_i$ is a colour class, and $|\mathcal{C}_i|=r_i \geq 1$, we investigate a simple connected graph structure $G^{\C}$, which…

General Mathematics · Mathematics 2017-02-08 Johan Kok , Naduvath Sudev , Muhammad Kamran Jamil

We show that the strong odd chromatic number on any proper minor-closed graph class is bounded by a constant. We almost determine the smallest such constant for outerplanar graphs.

Combinatorics · Mathematics 2025-05-06 Miriam Goetze , Fabian Klute , Kolja Knauer , Irene Parada , Juan Pablo Peña , Torsten Ueckerdt

We systematically determine circular chromatic index of small graphs and multigraphs with maximum degree $4$, $5$, $6$ (and also their number for a given small order). We construct several infinite families of such graphs with circular…

Combinatorics · Mathematics 2026-03-11 Ján Mazák , Filip Zrubák

The packing chromatic number $\chi$ $\rho$ (G) of a graph G is the smallest integer k such that its set of vertices V (G) can be partitioned into k disjoint subsets V 1 ,. .. , V k , in such a way that every two distinct vertices in V i are…

Discrete Mathematics · Computer Science 2018-08-15 Daouya Laïche , Eric Sopena

A b-coloring of a graph is a proper coloring of its vertices such that each color class contains a vertex adjacent to at least one vertex of every other color class. The b-chromatic number of a graph is the largest integer k such that the…

Combinatorics · Mathematics 2019-04-04 Renata Del-Vecchio , Mekkia Kouider

Given any integer d >= 3, let k be the smallest integer such that d < 2k log k. We prove that with high probability the chromatic number of a random d-regular graph is k, k+1, or k+2, and that if (2k-1) \log k < d < 2k \log k then the…

Disordered Systems and Neural Networks · Physics 2007-05-23 Dimitris Achlioptas , Cristopher Moore

By a finite type-graph we mean a graph whose set of vertices is the set of all $k$-subsets of $[n]=\{1,2,\ldots, n\}$ for some integers $n\ge k\ge 1$, and in which two such sets are adjacent if and only if they realise a certain order type…

Combinatorics · Mathematics 2017-09-12 Christian Avart , Bill Kay , Christian Reiher , Vojtěch Rödl

The distinguishing chromatic number of a graph $G$, denoted $\chi_D(G)$, is the minimum number of colours in a proper vertex colouring of $G$ that is preserved by the identity automorphism only. Collins and Trenk proved that $\chi_D(G)\le…

Combinatorics · Mathematics 2025-05-26 Christoph Brause , Rafał Kalinowski , Monika Pilśniak , Ingo Schiemeyer

We prove that the list chromatic index of a graph of maximum degree $\Delta$ and treewidth $\leq \sqrt{2\Delta} -3$ is $\Delta$; and that the total chromatic number of a graph of maximum degree $\Delta$ and treewidth $\leq \Delta/3 +1$ is…

Combinatorics · Mathematics 2013-11-14 Henning Bruhn , Richard Lang , Maya Stein

The clique chromatic number of a graph is the smallest number of colors in a vertex coloring so that no maximal clique is monochromatic. In this paper, we determine the order of magnitude of the clique chromatic number of the random graph…

Combinatorics · Mathematics 2025-06-04 Manuel Fernandez , Lutz Warnke

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