---
title: "Magma V2.26-9 Patch Notes"
canonical: "https://docs.magma-maths.org/patchnotes/2.26-9.html"
source: "https://docs.magma-maths.org/patchnotes/2.26-9.md"
---

<a id="magma-v2-26-9-patch-notes"></a>
# Magma V2.26-9 Patch Notes

## Algebraic Number Fields

- A crash in `MaximalOrder` for number fields where the defining polynomial is either non-monic or non-integral has been fixed. Reported by M. Grassl.

## Arithmetic Geometry

- A problem that occurs when unstable curves are input to intrinsics such as `TernaryFormPotentiallyUnstablePrimes` and  `MinimizeReduce` which call it has been fixed by A.-S. Elsenhans.
- A crash in [`PointSearch`](../AlgebraicGeometry/Schemes/anfs.md#function-pointsearch-sch-fldrat-rngintelt) where the number of minors of the Jacobian matrix is too large has been fixed.  Reported by B. Nasserden.

## Galois Theory

- A small improvement has been made to prime selection when computing the `Subfields` of an algebraic function field represented as an extension of another algebraic function field.

## Group Theory

- A bug in `MaximalSubgroups` applied to groups with a composition factor PSL(3,p^2) has been fixed. Bug reported by P. Mueller as a bug in `IsMaximal` for permutation groups.
- Calculating the order of matrix groups of classical type has been improved by using classical recognition algorithms.

## Hyperelliptic Curves

- A potential infinite loop in [`ReducedMinimalWeierstrassModel`](../ArithmeticGeometry/HyperellipticCurves/creation.md#function-reducedminimalweierstrassmodel-crvhyp) has been fixed.  Reported by A. Sutherland.

## Invariant Theory

- An bug causing an incorrect (non-minimal) result in `FundamentalInvariants` has been fixed.  Reported by U. Thiel.

## Lattices

- A crash in [`CloseVectors`](../LatticesQuadraticForms/Lattices/enumeration.md#function-closevectors-lat-modtuprngelt-rngelt) has been fixed.  Reported by M. Kirschmer.

## Matrices

- A bug in `InvariantFactors` for matrices over small finite fields has been fixed.  Reported by G. Thomas.

## Representation Theory

- Further improvements and bug fixes have been made to `IrreducibleModules(G, RationalField())` for a pc-group $G$.