---
title: "Magma V2.27-7 Patch Notes"
canonical: "https://docs.magma-maths.org/patchnotes/2.27-7.html"
source: "https://docs.magma-maths.org/patchnotes/2.27-7.md"
---

<a id="magma-v2-27-7-patch-notes"></a>
# Magma V2.27-7 Patch Notes

## Algebraic Geometry

- A bug in `Extend` when alternate equations become undefined has been fixed.  Reported by T. Keller.
- Bugs in [`Genus4GonalMap`](../AlgebraicGeometry/AlgebraicCurves/arith-2.md#function-genus4gonalmap-crv) and [`Genus5GonalMap`](../AlgebraicGeometry/AlgebraicCurves/arith-2.md#function-genus5gonalmap-crv) have been fixed. Reported by D. Roe.

## Algebraic Number Fields

- The handling of empty sequences on the RHS of the `ideal<|>` constructor has been improved. Reported by M. Kirschmer.

## Arithmetic Geometry

- A bug in [`HeightConstant`](../ArithmeticGeometry/HyperellipticCurves/jacobians-number-fields.md#function-heightconstant-jachyp) for Jacobians of hyperelliptic curves. Fix provided by M. Stoll.
- A hang in `Chabauty` has been fixed.  Reported by N. Bruin and fix provided by M. Stoll.
- A crash in [`HyperellipticCurveFromIgusaClebsch`](../ArithmeticGeometry/HyperellipticCurves/invariants-isomorphisms.md#function-hyperellipticcurvefromigusaclebsch-seqenum) for certain types of input has been fixed.  Reported by E. Costa.

## Complex Field

- A crash in complex root finding (arising from [`ReducedMinimalWeierstrassModel`](../ArithmeticGeometry/HyperellipticCurves/creation.md#function-reducedminimalweierstrassmodel-crvhyp)) has been fixed.  Reported by E. Costa.

## Elliptic Curves

- A crash in [`IsogenousCurves`](../ArithmeticGeometry/EllipticCurvesOverQAndNumberFields/intro-2.md#function-isogenouscurves-crvell-fldrat) for certain types of input has been fixed. Reported by M. Voznyy.

## Galois Groups

- A crash in the computation of `Subfields` and `GaloisGroup` of a relative extension of function fields has been fixed. Reported by D. Karagueuzian.

## Group Theory

- A crash in `CharacterTable` applied to soluble groups with very large number of classes has been fixed.  Reported by D. Roe.

## Lattices

- An error in `GenusRepresentatives` has been fixed. Reported by R. Scharlau.

## Local Rings

- Enumerating the elements of an extension of a $p$-adic ring with precision 1 has been fixed to ensure there are no duplicates in the enumeration. Reported by C. Putz.

## Matrix Algebras

- A case in the function in [`PrimitiveIdempotents`](../Algebras/MatrixAlgebras/presentations.md#function-primitiveidempotents-algmat) where the result did not contain normal matrices has been fixed. Reported by J. Maglione.