Ruzsa's sumset conjecture for finite sets of squares

From papers

For a finite set EE of squares, write E+E={x+y:x,yE}E+E=\{x+y:x,y\in E\}. Ruzsa's conjecture. For every ϵ>0\epsilon>0,

E+EE2ϵ.|E+E|\gg |E|^{2-\epsilon}.

The source states that Chang's conjecture implies this one, while the Bombieri--Lang conjecture yields only weaker bounds; its general validity remains open.

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Sources & referencesView supporting material

Primary source

Javier Cilleruelo and Andrew Granville, “Lattice points on circles, squares in arithmetic progressions and sumsets of squares”, arXiv:math/0608109 (2006).

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