arXiv · 0905.1991
Let $A$ be a finite set of positive real numbers. We present a sum-division estimate: |A+A|^2|A/A|\geq\frac{|A|^4}{4}.
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Liangpan Li, Jian Shen. 2009-05-16. A sum-division estimate of reals. https://arxiv.org/abs/0905.1991
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