---
title: "Magma V2.17-5 Patch Notes"
canonical: "https://docs.magma-maths.org/patchnotes/2.17-5.html"
source: "https://docs.magma-maths.org/patchnotes/2.17-5.md"
---

<a id="magma-v2-17-5-patch-notes"></a>
# Magma V2.17-5 Patch Notes

## Coding Theory

- A bug that could cause crashes when creating a quantum code with the `ExtendedFormat` parameter set has been fixed. Reported by M. Grassl.

## Groups

- A bug in permutation group base and strong generating sets has been fixed. The bug was noticed as a crash while computing Galois groups of degree 170+ polynomials over the rationals.
- The function `FactoredClassicalGroupOrder` has been added at the request of E. O’Brien.
- A crash in `PermutationRepresentation` of an automorphism group has been fixed. Bug reportd by D. Howden.
- A crash caused by giving the `Evaluate` command a null sequence of images has been trapped to give a runtime error. Bug reportd by D. Howden.
- An occasional crash when reading transitive groups from the database has been fixed.
- The speed of access when reading transitive groups from the database has been improved.

## Hyperelliptic Curves

- The LSeries of a hyperelliptic curve now first transforms the curve into a MinimalWeierstrassModel (rather than a ReducedModel). This will give solve some problems at p=2, though others still remain.
- A bug with an identification of “hyperelliptic” curves of genus \< 2 has been fixed.

## Local Fields

- A signature [`PrincipalUnitGroupGenerators`](../LocalFields/PAdicRingsAndTheirExtensions/class-fields.md#function-principalunitgroupgenerators-rngpad) for `RngPadRes` has been added which fixes [`UnitGroupGenerators`](../LocalFields/PAdicRingsAndTheirExtensions/class-fields.md#function-unitgroupgenerators-rngpad) for `RngPadRes`.
- A coercion into an extension field from a base field has been improved avoiding a low precision intermediate calculation. Reported by Tim Dokchitser.

## Number Fields

- A failed inversion in a quotient of some order would cause some printing on the screen. Reported by M. Kirschmer.
- Computations of class groups and class numbers of number fields defined by pure polynomials could result in internal errors.
- Some computations of `MaximalOrder`s of Kummer extensions have been fixed. This fix applies to function fields which are Kummer extensions also. Reported by E. Th{ó}me.

## Polynomial Rings

- A slowdown in bivariate factorization in characteristic 2 has been fixed.

## Primality Proving

- A bug for 96-bit inputs to ECPP on 32-bit computers has been fixed.

## Special Functions

- The signature for JBessel has been restricted to require that the first argument is integral. This is the only implemented case in any event.

## Symmetric Function Algebras

- Coercion of a (multivariate) polynomial into a symmetric function algebra over its polynomial ring now works. Reported by A. Kasprzyk.