A lower bound for set-coloring Ramsey numbers.
Random Struct Algorithms
; 64(2): 157-169, 2024 Mar.
Article
em En
| MEDLINE
| ID: mdl-38516561
ABSTRACT
The set-coloring Ramsey number Rr,s(k) is defined to be the minimum n such that if each edge of the complete graph Kn is assigned a set of s colors from {1,
,r}, then one of the colors contains a monochromatic clique of size k. The case s=1 is the usual r-color Ramsey number, and the case s=r-1 was studied by Erdos, Hajnal and Rado in 1965, and by Erdos and Szemerédi in 1972. The first significant results for general s were obtained only recently, by Conlon, Fox, He, Mubayi, Suk and Verstraëte, who showed that Rr,s(k)=2Θ(kr) if s/r is bounded away from 0 and 1. In the range s=r-o(r), however, their upper and lower bounds diverge significantly. In this note we introduce a new (random) coloring, and use it to determine Rr,s(k) up to polylogarithmic factors in the exponent for essentially all r, s, and k.
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01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Random Struct Algorithms
Ano de publicação:
2024
Tipo de documento:
Article