中文

打破无 $K_t$ 次要子图图的着色退化壁垒

组合数学 2020-05-28 v2

摘要

1943 年,Hadwiger 猜想:对每个 t1t\geq 1,每个无 KtK_t 次要子图的图都是 (t1)(t-1)-可着色的。在 1980 年代,Kostochka 和 Thomason 各自证明了每个无 KtK_t 次要子图的图的平均度为 O(tlogt)O(t\sqrt{\log t}),因此是 O(tlogt)O(t\sqrt{\log t})-可着色的。我们证明每个无 KtK_t 次要子图的图对任一 β>1/4\beta > 1/4O(t(logt)β)O(t(\log t)^{\beta})-可着色的,这是对 Kostochka-Thomason 界的数量级的首次改进。

关键词

引用

@article{arxiv.1910.09378,
  title  = {Breaking the degeneracy barrier for coloring graphs with no $K_t$ minor},
  author = {Sergey Norin and Luke Postle and Zi-Xia Song},
  journal= {arXiv preprint arXiv:1910.09378},
  year   = {2020}
}

备注

This version adds a new coauthor and significantly strengthens the main result by combining the previous version with arXiv:1911.01491. Several other major changes in content and presentation are made