---
title: "Magma V2.28-19 Patch Notes"
canonical: "https://docs.magma-maths.org/patchnotes/2.28-19.html"
source: "https://docs.magma-maths.org/patchnotes/2.28-19.md"
---

<a id="magma-v2-28-19-patch-notes"></a>
# Magma V2.28-19 Patch Notes

## Associative Algebras

- Bug in the choice of representatives in `Neighbors` for quaternion ideals has been corrected.

## Curves

- `UniformizingParameter` for points and places on a curve has been improved to return smaller elements. Reported by Maarten Derickx.

## Finite Fields

- A crash in `Embed` involving a mixture of default and non-default finite fields has been fixed.  Reported by Yusuke Uesato.

## Graphs

- [`OpenGraphFile`](../Combinatorics/Graphs/graph-databases.md#function-opengraphfile-monstgelt-rngintelt-rngintelt) will now raise an error when the file cannot be opened or is otherwise invalid.  Formerly it would print a message and return an unusable `IO` object. Reported by Primo\\v{z} Poto\\v{c}nik.

## Groebner Bases

- Some bad slowdowns in Groebner basis computation over $Z$ or $Q$ (when units are present) have been fixed.  Reported by Raymond van Bommel.

## Group Algebras

- Error checking for `quo<|>` has been increased to ensure that vector representation is being used. Reported by Joseph Baine.

## Groups

- An updated version of [`MinimalDegreePermutationRepresentation`](../FiniteGroups/Groups/category-transfer.md#function-minimaldegreepermutationrepresentation-grp) has been supplied by Derek Holt.
- An error in `NumberingMap` for permutation groups has been fixed. This bug may have caused incorrect answers to be returned when using the `NumberingMap`.  Bug reported by Primoz Potocnik.
- A crash in classical matrix group recognition has been fixed. This was reported as a crash in testing two p-groups for isomorphism by Primoz Potocnik and Eamonn O’Brien.

## Hilbert Modular Forms

- Fixed bug in `InnerProduct`, checking for an unassigned local variable. Reported by Edgar Costa.

## Hyperelliptic Curves

- Extra precision in the computation of `Conductor` has been allowed. Reported by Robin Visser.

## Linear Codes

- A very bad slowdown when creating a large number of linear or additive codes has been fixed.  Reported by Markus Grassl.

## Local Rings

- `SeriesPrinting` for local rings has been improved. Reported by Rob de Jeu.

## Modular Forms

- Fixed bug in creation of spaces of modular forms with character, when the codomain of the character is not minimal. Reported by Lewis Combes.

## System

- A new parameter `ExitSummary` has been added to [`Fork`](../MagmaLanguage/InputOutput/system-calls-2.md#function-fork) (default [`false`](../MagmaLanguage/StatementsAndExpressions/boolean.md#literal-literal-false-false)) so that, if selected, child processes created by [`Fork`](../MagmaLanguage/InputOutput/system-calls-2.md#function-fork) print the exit summary (“Total time…”) when Magma exits; by default that summary is now suppressed.  Also, new intrinsics [`SetExitSummary`](../MagmaLanguage/EnvironmentAndOptions/Set-Get.md#function-setexitsummary-boolelt)/[`GetExitSummary`](../MagmaLanguage/EnvironmentAndOptions/Set-Get.md#function-getexitsummary) allow one to set/get a flag which determines whether Magma prints the exit summary ([`true`](../MagmaLanguage/StatementsAndExpressions/boolean.md#literal-literal-true-true) by default at startup).  Requested by Drew Sutherland.
- An occasional crash in the interpreter when recovering from a runtime error during a try/catch statement has been fixed.