## Abstract The Ramsey number __R__(3, 8) can be defined as the least number __n__ such that every graph on __n__ vertices contains either a triangle or an independent set of size 8. With the help of a substantial amount of computation, we prove that __R__(3, 8)=28.
The irredundant ramsey number s(3, 7)
β Scribed by Guantao Chen; Cecil C. Rousseau
- Publisher
- John Wiley and Sons
- Year
- 1995
- Tongue
- English
- Weight
- 395 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0364-9024
No coin nor oath required. For personal study only.
β¦ Synopsis
Abstract
The irredundant Ramsey number s(m, n) is the smallest p such that for every graph G with p vertices, either G contains an nβelement irredundant set or its complement G contains an mβelement irredundant set. Cockayne, Hattingh, and Mynhardt have given a computerβassisted proof that s(3, 7) = 18. The purpose of this paper is to give a selfβcontained proof of this result. Β© 1995 John Wiley & Sons, Inc.
π SIMILAR VOLUMES
Chvatal established that r(T,, K,,) = (m -1 ) ( n -1 ) + 1, where T, , , is an arbitrary tree of order m and K, is the complete graph of order n. This result was extended by Chartrand, Gould, and Polimeni who showed K, could be replaced by a graph with clique number n and order n + 5 provided n 2 3
## Abstract Graph __G__ is a (__k__,β__p__)βgraph if __G__ does not contain a complete graph on __k__ vertices __K__~__k__~, nor an independent set of order __p__. Given a (__k__,β__p__)βgraph __G__ and a (__k__,β__q__)βgraph __H__, such that __G__ and __H__ contain an induced subgraph isomorphic t
## Abstract Bounds are determined for the Ramsey number of the union of graphs versus a fixed graph __H__, based on the Ramsey number of the components versus __H__. For certain unions of graphs, the exact Ramsey number is determined. From these formulas, some new Ramsey numbers are indicated. In p
## Abstract Harary stated the conjecture that for any graph __G__ with __n__ edges and without isolated vertices __r__(__K__~3~,__G__) β©½ 2__n__ + 1. ErdΓΆs, Faudree, Rousseau, and Schelp proved that __r__(__K__~3~,__G__) β©½ β8/3__n__β. Here we prove that __r__(__K__~3~,__G__) β©½ β5/2__n__β β1 for __n_