Follow

Tensor products of graphs can require fewer colors than their factors: arxiv.org/abs/1905.02167

This short new preprint by Yaroslav Shitov gives counterexamples to Hedetniemi’s conjecture (en.wikipedia.org/wiki/Hedetnie) from 1966. In a new blog post (gilkalai.wordpress.com/2019/05) Gil Kalai explains the construction.

Sign in to participate in the conversation
Mathstodon

The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!