Tweaking the constant in the Linear Hadwiger Theorem

Source abstract

Norin and Steiner recently proved the Linear Hadwiger Conjecture. That is, there is an absolute constant $C$ such that every graph $G$ satisfies $χ(G)\leqslant C\,\text{had}(G)$, where $χ(G)$ is the chromatic number and $\text{had}(G)$ is the Hadwiger number of $G$. Their proof gives a non-optimised constant $C$ of order $10^{100}$. This paper uses extensive AI-based optimisation to show that every graph $G$ satisfies $χ(G) \leqslant 19{,}885{,}160\,\text{had}(G)$.