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Graphs and Combinatorics
Article . 1997 . Peer-reviewed
License: Springer TDM
Data sources: Crossref
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zbMATH Open
Article . 1997
Data sources: zbMATH Open
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Article . 2020
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Constructive Bounds for a Ramsey-Type Problem

Constructive bounds for a Ramsey-type problem
Authors: Noga Alon; Michael Krivelevich;

Constructive Bounds for a Ramsey-Type Problem

Abstract

Many important bounds for the Ramsey function \(R(s,t)\) are proved using probabilistic techniques. Some additional constructive ideas have been developed in recent years, but they usually give weaker bounds. The authors consider a more general Ramsey type function, and give constructive bounds for this function. In particular, given integers \(r\) and \(s\) with \(2 \leq r < s\), they construct a graph \(H = H_{r,s,n}\) of order \(n\) such that for some \(\varepsilon = \varepsilon(r,s)\), \(H\) contains no clique of order \(s\) and every subset with at least \(n^{1 - \varepsilon}\) vertices contains a clique of size \(r\). These constructions use properties of finite geometries and geometric expanders.

Related Organizations
Keywords

Ramsey numbers, Extremal problems in graph theory, Generalized Ramsey theory, Combinatorial aspects of finite geometries, finite geometries

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    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
36
Top 10%
Top 10%
Average
bronze