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Electronic Journal of Combinatorics
Article . 2018 . Peer-reviewed
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Bipartite Ramsey Numbers for Graphs of Small Bandwidth

Bipartite Ramsey numbers for graphs of small bandwidth
Authors: Lili Shen; Qizhong Lin; Qinghai Liu;

Bipartite Ramsey Numbers for Graphs of Small Bandwidth

Abstract

A graph $H=(W,E_H)$ is said to have bandwidth at most $b$ if there exists a labeling of $W$ as $w_1,w_2,\dots,w_n$ such that $|i-j|\leq b$ for every edge $w_iw_j\in E_H$, and a bipartite balanced $(\beta,\Delta)$-graph $H$ is a bipartite graph with bandwidth at most $\beta |W|$ and maximum degree at most $\Delta$, and furthermore it has a proper 2-coloring $\chi :W\rightarrow[2]$ such that $||\chi^{-1}(1)|-|\chi^{-1}(2)||\leq\beta|\chi^{-1}(2)|$. We prove that for any fixed $0<\gamma<1$ and integer $\Delta\ge1$, there exist a constant $\beta=\beta(\gamma,\Delta)>0$ and a natural number $n_0$ such that for every balanced $(\beta,\Delta)$-graph $H$ on $n\geq n_0$ vertices the bipartite Ramsey number $br(H,H)$ is at most $(1+\gamma)n$. In particular, $br(C_{2n},C_{2n})=(2+o(1))n$.

Related Organizations
Keywords

Graph labelling (graceful graphs, bandwidth, etc.), bipartite Ramsey number, regularity lemma, balanced \((\beta,\Delta)\)-graph, Generalized Ramsey theory

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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!
7
Top 10%
Average
Average
gold