Results 21 to 30 of about 248,095 (281)

On two problems in graph Ramsey theory [PDF]

open access: yes, 2010
We study two classical problems in graph Ramsey theory, that of determining the Ramsey number of bounded-degree graphs and that of estimating the induced Ramsey number for a graph with a given number of vertices.
A. Thomason   +36 more
core   +5 more sources

Restricted Size Ramsey Number Involving Matching and Graph of Order Five

open access: yesJournal of Mathematical and Fundamental Sciences, 2020
Harary and Miller (1983) started the research on the (restricted) size Ramsey number for a pair of small graphs. They obtained the values for some pairs of small graphs with order not more than four.
Denny Riama Silaban   +2 more
doaj   +1 more source

Star-Critical Ramsey Numbers for Cycles Versus K4

open access: yesDiscussiones Mathematicae Graph Theory, 2021
Given three graphs G, H and K we write K → (G, H), if in any red/blue coloring of the edges of K there exists a red copy of G or a blue copy of H. The Ramsey number r(G, H) is defined as the smallest natural number n such that Kn → (G, H) and the star ...
Jayawardene Chula J.   +2 more
doaj   +1 more source

On minimal Ramsey graphs and Ramsey equivalence in multiple colours

open access: yes, 2020
For an integer $q\ge 2$, a graph $G$ is called $q$-Ramsey for a graph $H$ if every $q$-colouring of the edges of $G$ contains a monochromatic copy of $H$. If $G$ is $q$-Ramsey for $H$, yet no proper subgraph of $G$ has this property then $G$ is called $q$
Clemens, Dennis   +2 more
core   +1 more source

Another View of Bipartite Ramsey Numbers

open access: yesDiscussiones Mathematicae Graph Theory, 2018
For bipartite graphs F and H and a positive integer s, the s-bipartite Ramsey number BRs(F,H) of F and H is the smallest integer t with t ≥ s such that every red-blue coloring of Ks,t results in a red F or a blue H.
Bi Zhenming, Chartrand Gary, Zhang Ping
doaj   +1 more source

Single Atom and Two Atom Ramsey Interferometry with Quantized Fields [PDF]

open access: yes, 2002
Implications of field quantization on Ramsey interferometry are discussed and general conditions for the occurrence of interference are obtained. Interferences do not occur if the fields in two Ramsey zones have precise number of photons. However in this
A. Rauschenbeutel   +37 more
core   +4 more sources

Generalized Ramsey numbers for paths in 2-chromatic graphs

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 1986
Chung and Liu have defined the d-chromatic Ramsey number as follows. Let 1≤d≤c and let t=(cd). Let 1,2,…,t be the ordered subsets of d colors chosen from c distinct colors. Let G1,G2,…,Gt be graphs. The d-chromatic Ramsey number denoted by rdc(G1,G2,…,Gt)
R. Meenakshi, P. S. Sundararaghavan
doaj   +1 more source

Restricted size Ramsey number for path of order three versus graph of order five

open access: yesElectronic Journal of Graph Theory and Applications, 2017
Let $G$ and $H$ be simple graphs. The Ramsey number for a pair of graph $G$ and $H$ is the smallest number $r$ such that any red-blue coloring of edges of $K_r$ contains a red subgraph $G$ or a blue subgraph $H$.
Denny Riama Silaban   +2 more
doaj   +1 more source

Triangular Ramsey Numbers

open access: yes, 2016
The purpose of this paper is to introduce the idea of triangular Ramsey numbers and provide values as well as upper and lower bounds for them. To do this, the combinatorial game Mines is introduced; after some necessary theorems about triangular sets are proved. This game is easy enough that young children are able to play. The most basic variations of
Chaney, Zachary   +3 more
openaire   +3 more sources

Sidon–Ramsey and $$B_{h}$$-Ramsey numbers

open access: yesBoletín de la Sociedad Matemática Mexicana
AbstractFor a given positive integer k, the Sidon–Ramsey number $${{\,\textrm{SR}\,}}(k)$$ SR ( k ) is defined as the minimum ...
Manuel A. Espinosa-García   +3 more
openaire   +2 more sources

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