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The average number of integral points on the congruent number curves

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arxiv 2112.01615 v2 pith:I7B2IB7R submitted 2021-12-02 math.NT

The average number of integral points on the congruent number curves

classification math.NT
keywords curvesintegralnumberaveragepointsapplicationbinarycongruent
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

We show that the total number of non-torsion integral points on the elliptic curves $\mathcal{E}_D:y^2=x^3-D^2x$, where $D$ ranges over positive squarefree integers less than $N$, is $O( N(\log N)^{-1/4+\epsilon})$. The proof involves a discriminant-lowering procedure on integral binary quartic forms and an application of Heath-Brown's method on estimating the average size of the $2$-Selmer group of the curves in this family.

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