Expanders with superquadratic growth
Combinatorics
2016-11-17 v1 Number Theory
Abstract
We will prove several expanders with exponent strictly greater than . For any finite set , we prove the following six-variable expander results: \begin{align*} |(A-A)(A-A)(A-A)| &\gg \frac{|A|^{2+\frac{1}{8}}}{\log^{\frac{17}{16}}|A|}, \\ \left|\frac{A+A}{A+A}+\frac{A}{A}\right| &\gg \frac{|A|^{2+\frac{2}{17}}}{\log^{\frac{16}{17}}|A|}, \\ \left|\frac{AA+AA}{A+A}\right| &\gg \frac{|A|^{2+\frac{1}{8}}}{\log |A|}, \\ \left|\frac{AA+A}{AA+A}\right| &\gg \frac{|A|^{2+\frac{1}{8}}}{\log |A|}. \end{align*}
Cite
@article{arxiv.1611.05251,
title = {Expanders with superquadratic growth},
author = {Antal Balog and Oliver Roche-Newton and Dmitry Zhelezov},
journal= {arXiv preprint arXiv:1611.05251},
year = {2016}
}