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Every graph with no $\mathcal{K}_9^{-6}$ minor is $8$-colorable
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abstract
For positive integers $t$ and $s$, let $\mathcal{K}_t^{-s}$ denote the family of graphs obtained from the complete graph $K_t$ by removing $s$ edges. A graph $G$ has no $\mathcal{K}_t^{-s}$ minor if it has no $H$ minor for every $H\in \mathcal{K}_t^{-s}$. Motivated by the famous Hadwiger's Conjecture, Jakobsen in 1971 proved that every graph with no $\mathcal{K}_7^{-2}$ minor is $6$-colorable; very recently the present authors proved that every graph with no $\mathcal{K}_8^{-4}$ minor is $7$-colorable. In this paper we continue our work and prove that every graph with no $\mathcal{K}_9^{-6}$ minor is $8$-colorable. Our result implies that $H$-Hadwiger's Conjecture, suggested by Paul Seymour in 2017, is true for all graphs $H$ on nine vertices such that $H$ is a subgraph of every graph in $ \mathcal{K}_9^{-6}$.
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Every graph with no $K_7^{\vee}$-minor is $6$-colorable
Every graph with no K_7^∨-minor (K_7 with two edges sharing an endpoint deleted) is 6-colorable, proved via a new extremal theorem for 4-connected graphs.
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