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A graph $G$ is list point $k$-arborable if, whenever we are given a $k$-list assignment $L(v)$ of colors for each vertex $v\in V(G)$, we can choose a color $c(v)\in L(v)$ for each vertex $v$ so that each color class induces an acyclic…

Combinatorics · Mathematics 2014-03-13 Xin Zhang

A proper $k$-coloring of vertices of an $n$-vertex graph is equitable if the size of every color class is $\lfloor n/k\rfloor$ or $\lceil n/k\rceil$. An extension of it to list coloring requires only that the size of every color class is at…

Combinatorics · Mathematics 2026-05-19 H. A. Kierstead , Alexandr Kostochka , Zimu Xiang

In 2003 Kostochka, Pelsmajer, and West introduced a list analogue of equitable coloring called equitable choosability. A $k$-assignment, $L$, for a graph $G$ assigns a list, $L(v)$, of $k$ available colors to each $v \in V(G)$, and an…

Combinatorics · Mathematics 2019-08-06 Jeffrey A. Mudrock , Max Marsh , Tim Wagstrom

For a fixed number of colors, we show that, in node-weighted split graphs, cographs, and graphs of bounded tree-width, one can determine in polynomial time whether a proper list-coloring of the vertices of a graph such that the total weight…

Discrete Mathematics · Computer Science 2017-09-26 Cédric Bentz

An odd coloring of a graph is a proper coloring such that every non-isolated vertex has a color that appears at an odd number of its neighbors. This notion was introduced by Petr\v{s}evski and \v{S}krekovski in 2022. In this paper, we focus…

Combinatorics · Mathematics 2025-04-30 Masaki Kashima , Kenta Ozeki

A graph on $n$ vertices is equitably $k$-colorable if it is $k$-colorable and every color is used either $\left\lfloor n/k \right\rfloor$ or $\left\lceil n/k \right\rceil$ times. Such a problem appears to be considerably harder than vertex…

Discrete Mathematics · Computer Science 2023-06-22 Guilherme de C. M. Gomes , Carlos V. G. C. Lima , Vinícius F. dos Santos

The study of graph vertex colorability from an algebraic perspective has introduced novel techniques and algorithms into the field. For instance, it is known that $k$-colorability of a graph $G$ is equivalent to the condition $1 \in…

Combinatorics · Mathematics 2007-09-24 Christopher J. Hillar , Troels Windfeldt

A proper coloring of vertices of a graph is equitable if the sizes of any two color classes differ by at most 1. Such colorings have many applications and are interesting by themselves. In this paper, we discuss the state of art and…

Combinatorics · Mathematics 2025-04-22 H. A. Kierstead , Alexandr Kostochka , Zimu Xiang

A good deal of research has been done and published on coloring of the vertices of graphs for several years while studying of the excellent work of those maestros, we get inspire to work on the vertex coloring of graphs in case of a…

Discrete Mathematics · Computer Science 2013-09-16 Sabyasachi Mukhopadhyay , Paritosh Bhattacharya , B. B. Ghosh

Xuding Zhu introduced a refined scale of choosability in 2020 and observed that the four color theorem is tight on this scale. We formalize and explore this idea of tightness in what we call strictly colorable graphs. We then characterize…

Combinatorics · Mathematics 2023-07-12 Evan Leonard

We demonstrate that for every positive integer $\Delta$, every K\_4-minor-free graph with maximum degree $\Delta$ admits an equitable coloring with k colors wherek $\ge$ ($\Delta$+3)/2. This bound is tight and confirms a conjecture by Zhang…

Combinatorics · Mathematics 2017-03-08 Rémi De Joannis de Verclos , Jean-Sébastien Sereni

Independently posed by Behzad and Vizing, the Total Coloring Conjecture asserts that the total chromatic number of a simple connected graph $G$ is either $\Delta(G)+1$ or $\Delta(G)+2$, where $\Delta(G)$ is the largest degree of any vertex…

Combinatorics · Mathematics 2026-05-13 I. J. Dejter

A proper vertex coloring of a graph is equitable if the sizes of color classes differ by at most 1. The equitable chromatic number of a graph $G$, denoted by $\chi_=(G)$, is the minimum $k$ such that $G$ is equitably $k$-colorable. The…

Combinatorics · Mathematics 2012-10-02 Zhidan Yan , Wei Wang

Let $H$ be a $k$-uniform hypergraph with $n$ vertices. A {\em strong $r$-coloring} is a partition of the vertices into $r$ parts, such that each edge of $H$ intersects each part. A strong $r$-coloring is called {\em equitable} if the size…

Combinatorics · Mathematics 2007-05-23 Raphael Yuster

In a bounded max-coloring of a vertex/edge weighted graph, each color class is of cardinality at most $b$ and of weight equal to the weight of the heaviest vertex/edge in this class. The bounded max-vertex/edge-coloring problems ask for…

Data Structures and Algorithms · Computer Science 2009-04-13 Evripidis Bampis , Alexander Kononov , Giorgio Lucarelli , Ioannis Milis

A proper vertex coloring of a graph is equitable if the sizes of all color classes differ by at most $1$. For a list assignment $L$ of $k$ colors to each vertex of an $n$-vertex graph $G$, an equitable $L$-coloring of $G$ is a proper…

Combinatorics · Mathematics 2025-12-30 H. A. Kierstead , Alexandr Kostochka , Zimu Xiang

For a simple graph G = (V, E) and a positive integer k greater than or equal to 2, a coloring of vertices of G using exactly k colors such that each vertex has an equal number of neighbors of each color is called neighborhood-balanced…

Combinatorics · Mathematics 2025-09-09 Maurice Genevieva Almeida , Tarkeshwar Singh , Siddharth Gupta , Ravindra Pawar

Let ${\mathcal D}_d$ be the class of $d$-degenerate graphs and let $L$ be a list assignment for a graph $G$. A colouring of $G$ such that every vertex receives a colour from its list and the subgraph induced by vertices coloured with one…

Combinatorics · Mathematics 2020-03-24 E. Drgas-Burchardt , H. Furmańczyk , E. Sidorowicz

Let $r \geqslant 0$ and $k \geqslant 1$ be integers. We say that a graph $G$ has an $r$-equitable $k$-coloring if there exists a proper $k$-coloring of $G$ such that the sizes of any two color classes differ by at most $r$. The least $k$…

Combinatorics · Mathematics 2013-08-09 Chih-Hung Yen

In 2009, Kong, Wang, and Lee introduced the problem of finding the edge-balanced index sets ($EBI$) of complete bipartite graphs $K_{m,n}$, where they examined the cases $n=1$, $2$, $3$, $4$, $5$ and the case $m=n$. Since then the problem…

Combinatorics · Mathematics 2015-09-08 Ha Dao , Hung Hua , Michael Ngo , Christopher Raridan