The conjecture on the least exponent for double almost squares

Let g(θ)g(\theta) be the least exponent such that, for some c1,c2>0c_1,c_2>0, every interval of the form

[xc1xg(θ),x+c1xg(θ)][x-c_1x^{g(\theta)},x+c_1x^{g(\theta)}]

contains an integer n=a1b1=a2b2n=a_1b_1=a_2b_2, where

a1<a2b2<b1a_1<a_2\leq b_2<b_1

and all four integers lie in

[x1/2c2xθ,x1/2+c2xθ][x^{1/2}-c_2x^\theta,x^{1/2}+c_2x^\theta]

and 0θ<1/20\leq\theta<1/2; the constants c1c_1 and c2c_2 may depend on θ\theta. The double almost-square exponent conjecture. For 1/4θ<1/21/4\leq\theta<1/2,

g(θ)=12θ.g(\theta)=1-2\theta.

The conjecture is motivated by the proved lower bound g(θ)12θg(\theta)\geq1-2\theta and the upper bound g(θ)1θg(\theta)\leq1-\theta for 1/4θ1/31/4\leq\theta\leq1/3; no resolution is supplied here.

Sources & referencesView supporting material

Primary source

Tsz Ho Chan, “Finding Almost Squares II”, arXiv:math/0503438 (2005).

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