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Solubility of a resultant equation and applications

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arxiv 2411.09264 v2 pith:VX6LFL64 submitted 2024-11-14 math.NT

Solubility of a resultant equation and applications

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

The large sieve is used to estimate the density of integral quadratic polynomials $Q$, such that there exists an odd degree integral polynomial which has resultant $\pm 1$ with $Q$. Given a monic integral polynomial $R$ of odd degree, this is used to show that for almost all integral quadratic polynomials $Q$, there exists a prime $p$ such that $Q$ and $R$ share a common root in the algebraic closure of the finite field with $p$ elements. Using recent work of Landesman, an application to the average size of the odd part of the class group of quadratic number fields is also given.

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