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The rank of 2-Selmer group associate to $\theta$-congruent numbers

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arxiv 2210.01678 v1 pith:IQPPXQCZ submitted 2022-10-04 math.NT

classification math.NT
keywords congruentnumbersgrouprankrespselmersomeassociate
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abstract

We study the parity of rank of $2$-${\rm Selmer}$ groups associated to $\pi/3$ and $2\pi/3$-congruent numbers. Our second result gives some positive densities about $\pi/3$ and $2\pi/3$ non-congruent numbers which can support the even part of Goldfeld's conjecture. We give some necessary conditions such that $n$ is non $\pi/3$-congruent number for elliptic curves $E_n$ whose Shafarevich-Tate group is non-trivial. In the last section, we show that for $n=pq\equiv 5(resp. \ 11)\pmod{24}$, the density of non $\pi/3$($resp.$ $2\pi/3$)-congruent numbers is at least 75\%, where $p,q$ are primes.

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  1. The size of $2$-Selmer groups for the $\frac{\pi}{3}$-congruent number problem

    math.NT 2026-02 conditional novelty 6.0 of 10

    For square-free n ≡ 5 or 13 mod 24 with all prime factors ≡ 1 mod 4, the average 2-Selmer size of the pi/3-congruent curve is 9, yielding positive densities of Selmer rank 0/2 and 1/3.

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