Further Progress towards the List and Odd Versions of Hadwiger's Conjecture

Abstract

In 1943, Hadwiger conjectured that every graph with no $K_t$ minor is $(t-1)$-colorable for every $t\ge 1$. In the 1980s, Kostochka and Thomason independently proved that every graph with no $K_t$ minor has average degree $O(t\sqrt{\log t})$ and hence is $O(t\sqrt{\log t})$-colorable. Recently, Norin, Song and the author showed that every graph with no $K_t$ minor is $O(t(\log t{)}^{\beta })$-colorable for every $\beta >1/4$, making the first improvement on the order of magnitude of the $O(t\sqrt{\log t})$ bound. Building on that work, we previously showed that every graph with no $K_t$ minor is $O(t(\log t{)}^{\beta })$-colorable for every $\beta >0$. More specifically, they are $O(t\cdot (\log \log t{)}^6)$-colorable. In this paper, we extend that work to the list and odd generalizations of Hadwiger's conjecture.

28 pages

References in corpus (6)

• Breaking the degeneracy barrier for coloring graphs with no $K_t$ minor
• An even better Density Increment Theorem and its application to Hadwiger's Conjecture
• Further progress towards Hadwiger's conjecture
• Halfway to Hadwiger's Conjecture
• A new upper bound on the chromatic number of graphs with no odd $K_t$ minor
• Connectivity and choosability of graphs with no $K_t$ minor