## Abstract

We consider the chromatic number of a family of graphs we call box graphs, which arise from a box complex in n-space. It is straightforward to show that any box graph in the plane has an admissible coloring with three colors, and that any box graph in n-space has an admissible coloring with n+1 colors. We show that for box graphs in n-space, if the lengths of the boxes in the corresponding box complex take on no more than two values from the set {1,2,3}, then the box graph is 3-colorable, and for some graphs three colors are required. We also show that box graphs in 3-space which do not have cycles of length four (which we call “string complexes”) are 3-colorable.

Original language | American English |
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Journal | Discrete Mathematics |

Volume | 338 |

DOIs | |

State | Published - Feb 6 2015 |

## Keywords

- Graph coloring
- Box graph
- Chromatic number

## Disciplines

- Mathematics