Breaking the degeneracy barrier for coloring graphs with no K minor
Breaking the degeneracy barrier for coloring graphs with no K minor
复制标题
打破无 K 小调着色图的简并障碍
DOI:
10.1016/j.aim.2023.109020
复制
发表时间:
2019
影响因子:
1.7
通讯作者:
Zi
中科院分区:
文献类型:
--
作者:
S. Norin;Zi
In 1943, Hadwiger conjectured that every graph with no K t minor is (t− 1)-colorable for every t≥ 1. In the 1980s, Kostochka and Thomason independently proved that every graph with no K t minor has average degree O (t log t) and hence is O (t log t)-colorable. We show that every graph with no K t minor is O (t (log t) β)-colorable for every β> 1/4, making the first improvement on the order of magnitude of the Kostochka-Thomason bound.