Year: 2026
Type: preprint
Abstract: We prove the following two upper bounds for ordered Ramsey numbers: (1) Every ordered forest $F$ on $n$ vertices satisfies $R_{<}(F,F)=O(n^{1+\lceil\logχ_{<}(F)\rceil})$. This in particular answers a question of Geneson, Holmes, Liu, Neidinger, Pehova and Wass. (2) There is a function $f$ such that, for every fixed ordered graph $H$ with maximum degree at most $Δ$ and interval chromatic number at most $k$, it holds that $R_{<}(H,K_n)=O_H(n^{f(Δ,k)})$.
Source: arXiv (Cornell University)
Authors: Gishboliner, Lior, Li, Xiangyu
Institution: University of Toronto
Language: English
Subfield: Discrete Mathematics and Combinatorics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7215061599