The Graham conjecture implies the Erdos-Turan conjecture

Details The Graham conjecture implies the Erdos-Turan conjecture The Graham conjecture implies the Erdos-Turan conjecture

2007-04-04

arxiv.org/abs/0704.0555v1

Mathematics

Number Theory

3 pages

Scientific paper

Erd\"{o}s and Tur\'{a}n once conjectured that any set $A\subset\mathbb{N}$ with $\sum_{a\in A}{1}/{a}=\infty$ should contain infinitely many progressions of arbitrary length $k\geq3$. For the two-dimensional case Graham conjectured that if $B\subset \mathbb{N}\times\mathbb{N}$ satisfies $$\sum\limits_{(x,y)\in B}\frac{1}{x^2+y^2}=\infty,$$ then for any $s\geq2$, $B$ contains an $s\times s$ axes-parallel grid. In this paper it is shown that if the Graham conjecture is true for some $s\geq2$, then the Erd\"{o}s-Tur\'{a}n conjecture is true for $k=2s-1$.

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