English

Effective results for discriminant equations over finitely generated domains

Number Theory 2023-09-19 v1

Abstract

Let AA be an integral domain with quotient field KK of characteristic 00 that is finitely generated as a Z\mathbb{Z}-algebra. Denote by D(F)D(F) the discriminant of a polynomial FA[X]F\in A[X]. Further, given a finite etale algebra Ω\Omega, we denote by DΩ/K(α)D_{\Omega/K}(\alpha ) the discriminant of α\alpha over KK. For non-zero δA\delta\in A, we consider equations D(F)=δ D(F)=\delta to be solved in monic polynomials FA[X]F\in A[X] of given degree n2n\geq 2 having their zeros in a given finite extension field GG of KK, and DΩ/K(α)=δ\mboxinαO, D_{\Omega/K}(\alpha)=\delta\,\,\mbox{ in } \alpha\in O, where OO is an AA-order of Ω\Omega, i.e., a subring of the integral closure of AA in Ω\Omega that contains AA as well as a KK-basis of Ω\Omega. In our book ``Discriminant Equations in Diophantine Number Theory, which will be published by Cambridge University Press we proved that if AA is effectively given in a well-defined sense and integrally closed, then up to natural notions of equivalence the above equations have only finitely many solutions, and that moreover, a full system of representatives for the equivalence classes can be determined effectively. In the present paper, we extend these results to integral domains AA that are not necessarily integrally closed.

Keywords

Cite

@article{arxiv.1602.04730,
  title  = {Effective results for discriminant equations over finitely generated domains},
  author = {Jan-Hendrik Evertse and Kálmán Györy},
  journal= {arXiv preprint arXiv:1602.04730},
  year   = {2023}
}

Comments

20 pages

R2 v1 2026-06-22T12:50:31.183Z