## Abstract

A (k,r)-coloring of a graph G is a proper k-vertex coloring of G such that the neighbors of each vertex of degree d will receive at least min{d,r} different colors. The r-hued chromatic number, denoted by χ_{r}(G), is the smallest integer k for which a graph G has a (k,r)-coloring. This article is intended to survey the recent developments on the studies related to this r-hued colorings. Emphases are on the r-hued colorings of planar graphs, graph families with forbidden minors, and sparse graphs, as well as on the comparison between the r-hued chromatic number and the chromatic number of a graph, and the sensitivity studies of the r-hued chromatic number. It also surveys other related results on r-hued colorings and list r-hued colorings.

Original language | English (US) |
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Pages (from-to) | 24-48 |

Number of pages | 25 |

Journal | Discrete Applied Mathematics |

Volume | 321 |

DOIs | |

State | Published - Nov 15 2022 |

## Keywords

- Distance colorings
- List r-hued chromatic number
- r-hued chromatic number

## ASJC Scopus subject areas

- Discrete Mathematics and Combinatorics
- Applied Mathematics