Directed graphs without rainbow triangles
Abstract
One of the most fundamental results in graph theory is Mantel's theorem which determines the maximum number of edges in a triangle-free graph of order . Recently a colorful variant of this problem has been solved. In such a variant we consider graphs on a common vertex set, thinking of each graph as edges in a distinct color, and want to determine the smallest number of edges in each color which guarantees existence of a rainbow triangle. Here, we solve the analogous problem for directed graphs without rainbow triangles, either directed or transitive, for any number of colors. The constructions and proofs essentially differ for and and the type of the forbidden triangle. Additionally, we also solve the analogous problem in the setting of oriented graphs.
Cite
@article{arxiv.2308.01461,
title = {Directed graphs without rainbow triangles},
author = {Sebastian Babiński and Andrzej Grzesik and Magdalena Prorok},
journal= {arXiv preprint arXiv:2308.01461},
year = {2023}
}
Comments
20 pages