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Description

This repository contains Magma code to verify the statements in the article

Nicolas Mascot, Jeroen Sijsling, and John Voight
A Prym variety with everywhere good reduction over QQ (sqrt (61)) Preprint available at arXiv:1908.00421

The file PariPeriodsOutput.txt and Matrices.m contain the output of the period matrix calculations in Section 2. The files whose names start with FindEquation perform the isolation of the building block in Section 3 and the recovery of a first equation for an algebraic curve in Section 4. The simplification and verification in Section 5 takes place in the places starting with Simplify, Certify (verification of endomorphisms), and Verify (verification of the curve and its modularity). These algorithms also require some very summary routines for invariants of binary quartics binary_quartics.m.

Prerequisites

An installation of Magma and the dependency JRSijsling/curve_reconstruction.

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Code for finding a Prym variety with everywhere good reduction

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