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The equitable coloring problem, introduced by Meyer in 1973, has received considerable attention and research. Recently, Wu, Zhang and Li introduced the concept of equitable $(t,k)$-tree-coloring, which can be regarded as a generalization…

Combinatorics · Mathematics 2016-02-16 Yaping Mao , Zhiwei Guo , Hongjian Lai , Haixing Zhao

An \emph{equitable $(q, r)$-tree-coloring} of a graph $G$ is a $q$-coloring of $G$ such that the subgraph induced by each color class is a forest of maximum degree at most $r$ and the sizes of any two color classes differ by at most $1.$…

A $(q,r)$\emph{-tree-coloring} of a graph $G$ is a $q$-coloring of vertices of $G$ such that the subgraph induced by each color class is a forest of maximum degree at most $r.$ An \emph{equitable $(q, r)$-tree-coloring} of a graph $G$ is a…

Combinatorics · Mathematics 2015-06-15 Keaitsuda Maneeruk Nakprasit , Kittikorn Nakprasit

An equitable tree-$k$-coloring of a graph is a vertex coloring on $k$ colors so that every color class incudes a forest and the sizes of any two color classes differ by at most one.This kind of coloring was first introduced in 2013 and can…

Combinatorics · Mathematics 2019-08-15 Xin Zhang , Bei Niu

The equitable tree-coloring can formulate a structure decomposition problem on the communication network with some security considerations. Namely, an equitable tree-$k$-coloring of a graph is a vertex coloring using $k$ distinct colors…

Combinatorics · Mathematics 2021-04-13 Xin Zhang , Bei Niu , Yan Li , Bi Li

A $(q,t)$\emph{-tree-coloring} of a graph $G$ is a $q$-coloring of vertices of $G$ such that the subgraph induced by each color class is a forest of maximum degree at most $t.$ A $(q,\infty)$\emph{-tree-coloring} of a graph $G$ is a…

Combinatorics · Mathematics 2016-03-31 Keaitsuda Maneeruk Nakprasit , Kittikorn Nakprasit

An equitable tree-$k$-coloring of a graph is a vertex $k$-coloring such that each color class induces a forest and the size of any two color classes differ by at most one. In this work, we show that every interval graph $G$ has an equitable…

Combinatorics · Mathematics 2020-03-10 Bei Niu , Bi Li , Xin Zhang

An equitable $(t,k,d)$-tree-coloring of a graph $G$ is a coloring to vertices of $G$ such that the sizes of any two color classes differ by at most one and the subgraph induced by each color class is a forest of maximum degree at most $k$…

Combinatorics · Mathematics 2012-11-20 Jian-Liang Wu , Xin Zhang , Hailun Li

Equitable list arboricity, introduced by Zhang in 2016, generalizes the notion of equitable list coloring by requiring the subgraph induced by each color class to be acyclic (instead of edgeless) in addition to the usual upper bound on the…

Combinatorics · Mathematics 2021-06-03 Hemanshu Kaul , Jeffrey A. Mudrock , Michael J. Pelsmajer

Let $k \in \mathbb{N}$ and let $G$ be a simple graph with maximum degree $\Delta$. A $k$-colouring $\varphi$ of $G$ is an assignment of colours from $\{1,2,\ldots,k\}$ to the vertices of $G$. We call $\varphi$ proper if adjacent vertices…

Combinatorics · Mathematics 2026-04-16 Yuping Gao , Allan Lo , Songling Shan

The monochromatic tree partition number of an $r$-edge-colored graph $G$, denoted by $t_r(G)$, is the minimum integer $k$ such that whenever the edges of $G$ are colored with $r$ colors, the vertices of $G$ can be covered by at most $k$…

Combinatorics · Mathematics 2008-01-03 Xueliang Li , Fengxia Liu

Let $G$ be a nontrivial connected graph of order $n$ with an edge-coloring $c:E(G)\rightarrow\{1,2,\dots,t\}$,$t\in\mathbb{N}$, where adjacent edges may be colored with the same color. A tree $T$ in $G$ is a \emph{proper tree} if no two…

Combinatorics · Mathematics 2016-12-07 Wenjing Li , Xueliang Li , Jingshu Zhang

An equitable $k$-coloring of a graph is a proper $k$-coloring where the sizes of any two different color classes differ by at most one. In 1973, Meyer conjectured that every connected graph $G$ has an equitable $k$-coloring for some $k\leq…

Combinatorics · Mathematics 2025-11-07 Yangyang Cheng , Zhenyu Li , Wanting Sun , Guanghui Wang

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 2019-01-11 Jeffrey A. Mudrock , Madelynn Chase , Isaac Kadera , Ezekiel Thornburgh , Tim Wagstrom

An equitable partition of a graph $G$ is a partition of the vertex-set of $G$ such that the sizes of any two parts differ by at most one. We show that every graph with an acyclic coloring with at most $k$ colors can be equitably partitioned…

Combinatorics · Mathematics 2015-04-17 Louis Esperet , Laetitia Lemoine , Frédéric Maffray

A graph $G$ is equitably $k$-list arborable if for any $k$-uniform list assignment $L$, there is an equitable $L$-colouring of $G$ whose each colour class induces an acyclic graph. The smallest number $k$ admitting such a coloring is named…

Combinatorics · Mathematics 2021-06-29 Ewa Drgas-Burchardt , Janusz Dybizbański , Hanna Furmańczyk , Elzbieta Sidorowicz

An equitable coloring is a proper coloring of a graph such that the sizes of the color classes differ by at most one. A graph $G$ is equitably $k$-colorable if there exists an equitable coloring of $G$ which uses $k$ colors, each one…

Combinatorics · Mathematics 2018-03-21 Hemanshu Kaul , Jeffrey A. Mudrock , Michael J. Pelsmajer

A graph $G$ is equitably $k$-choosable if, for every $k$-uniform list assignment $L$, $G$ is $L$-colorable and each color appears on at most $\left\lceil |V(G)|/k\right\rceil$ vertices. Equitable list-coloring was introduced by Kostochka,…

Combinatorics · Mathematics 2023-05-24 Kirsten Hogenson , Dan Johnston , Suzanne O'Hara

An equitable coloring of a graph $G=(V,E)$ is a (proper) vertex-coloring of $G$, such that the sizes of any two color classes differ by at most one. In this paper, we consider the equitable coloring problem in block graphs. Recall that the…

Discrete Mathematics · Computer Science 2024-02-14 Hanna Furmańczyk , Vahan Mkrtchyan

A proper vertex coloring of a graph is equitable if the sizes of color classes differ by at most one. 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 2012-07-17 Zhidan Yan , Wei Wang
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