---
title: "Magma V2.14-15 Patch Notes"
canonical: "https://docs.magma-maths.org/patchnotes/2.14-15.html"
source: "https://docs.magma-maths.org/patchnotes/2.14-15.md"
---

<a id="magma-v2-14-15-patch-notes"></a>
# Magma V2.14-15 Patch Notes

## Algebraic Geometry

- An internal bug that caused crashes in [`IsHyperelliptic`](../AlgebraicGeometry/AlgebraicCurves/global-curvepl.md#function-crv-ishyp) and `Parametrize` has been fixed.
- Magma level printing of schemes whose Ideal is known has been fixed. Reported by E. O’Brien.

## Algebras

- A crash in creation of representation matricies of elements of orders of matrix (sub)algebras has been fixed. Reported by M. Kirschmer.

## Commutative Algebra

- An incorrect result for `IsPrime` applied to positive-dimensional ideals has been fixed.

## Elliptic Curves

- An error in counting points over finite fields, that sometimes returned the number of points on the quadratic twist, has been fixed. Reported by both M. Naehrig and D. Hankerson.

## Finite Fields

- A crash in enumeration over large finite fields has been fixed. Reported by H. Hubrechts.

## Finite Geometry

- A bug in [`BaerDerivation`](../Geometry/FinitePlanes/translation-planes.md#function-baerderivation-rngintelt) has been fixed. Reported by J. Key.

## Function Fields

- Fix coercion of divisors represented as a linear combination of places and exponents.
- Improve input checking for `Roots` given a polynomial and a divisor to be more flexible.
- Improve checks for selection of random elements in some constant fields when computing 2-element representation of ideals.

## Groups

- The function `MaximalSubgroups`, when applied to $PSp(4,4):4$, returned one class that was not maximal. This class has been eliminated.
- A bug in the construction of centralisers of elements of a general linear group over a finite field has been fixed. Bug reported by Mike Newman.
- A bug in the construction of centralisers of subgroups of PC-groups has been fixed.

## Linear Codes

- A new function `AutomorphismGroupAsMatrixGroup` returns the automorphism group of a linear code overa finite field as a monomial matrix group. New functions named `CodePermutationToMatrix` convert automorphisms and isomorphisms given as permutations to their matrix equivalent.
- A crash in [`PartialWeightDistribution`](../CodingTheory/LinearCodes/structural.md#function-partialweightdistribution-code-rngintelt) has been fixed.
- A leak in the [`Words`](../CodingTheory/AdditiveCodes/structural.md#function-words-code-rngintelt) function has been fixed. Reported by M. Grassl.

## Modules

- A missing test in coercion of maps into homomorphism spaces has been fixed. Reported by R. Bruner.

## Number Fields

- A bug in some multiplications of ideals of orders of number fields in relative representation has been fixed.
- A bug in the residue field mapping of some prime ideals of orders in relative representation has been fixed.

## Polynomial Rings

- A crash in factorization of polynomials over function fields of small characteristic has been fixed. Reported by F. Moeller.

## Power Series

- A leak in series inversion has been fixed. Reported by L. Taelman.

## Series Rings

- A fix to the check for Eisenstein polynomials containing zero coefficients has been made.

## Sparse Matrices

- A crash in sparse matrix addition has been fixed. Reported by M. Grassl.