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Local solubility of a family of ternary conics over a biprojective base I

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arxiv 2409.10688 v2 pith:6CLXDYBJ submitted 2024-09-16 math.NT

classification math.NT
keywords mathbbboundsrationalternarybasebinarybiprojectiveconditions
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abstract

Let $f,g\in\mathbb{Z}[u_1,u_2]$ be binary quadratic forms. We provide upper bounds for the number of rational points $(u,v)\in\mathbb{P}^1(\mathbb{Q})\times\mathbb{P}^1(\mathbb{Q})$ such that the ternary conic \[ X_{(u,v)}: f(u_1,u_2)x^2 + g(v_1,v_2)y^2 = z^2 \] has a rational point. We also give some conditions under which lower bounds exist.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Solubility of a family of conics with polynomial coefficients in many variables

    math.NT 2025-11 reject novelty 6.0 of 10

    An asymptotic for the density of soluble conics with polynomial coefficients is proposed, but the sign decomposition (6.5) that bridges the circle-method counts to the true count is false.

  2. The density of elliptic curves over $\mathbb{Q}_p$ with a rational 3-torsion point or a rational 3-isogeny

    math.NT 2025-02 accept novelty 6.0 of 10

    Random Weierstrass equations over Z_p have Haar-measure densities for admitting a Q_p-rational 3-torsion point or 3-isogeny given by exact rational functions depending on p modulo 3.

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