---
title: "Magma V2.11-11 Patch Notes"
canonical: "https://docs.magma-maths.org/patchnotes/2.11-11.html"
source: "https://docs.magma-maths.org/patchnotes/2.11-11.md"
---

<a id="magma-v2-11-11-patch-notes"></a>
# Magma V2.11-11 Patch Notes

## Algebraic Geometry

- A bug in the application of maps between schemes with alternative defining equations has been fixed.

## Commutative Algebra

- A bug in primary decomposition of positive-dimensional ideals defined over algebraic function fields has been fixed.
- A bug in evaluation of affine algebra elements has been fixed. Reported by Martijn Stam.

## Function Fields

- A bug in printing elements of function fields in product representation has been fixed.

## Groups

- Arithmetic operations for finitely presented Coxeter groups have been implemented in the C kernel replacing the existing package code, resulting in large speed-ups for computations with Coxeter groups.
- A bug in the construction of direct products of PC-groups that sometime caused crashes, particularly when forming products of a sequence of groups, has been fixed. Bug reported by Kasper Andersen.
- A bug with equality testing in automorphism groups of groups has been fixed. This has also fixed a bug with sets of elements of these groups.

## Integer Ring

- The ECPP primality prover now works in the AMD64 version. Also, `Certificate` has been fixed to work on all 64-bit versions. Other problems with ECPP since 2.11-9 have been fixed.

## Language

- A bug causing cmpeq to crash when applied to extended types has been fixed.
- A bug in the saving and restoring of workspaces has been fixed.
- A bug causing runtime errors in eq during profiling has been fixed.
- Some confusing error messages related to argument checking when calling Magma intrinsics have been fixed.

## Lattices

- A bug in `ShortVectors` running on 64-bit machines has been fixed.

## Number Fields

- Automorphisms of number fields now store attributes corresponding to the following properties: homomorphism, injectiion and surjection.
- Decomposition of index divisors in non-maximal orders is no longer allowed.
- Magma level printing of elements of number fields has been improved.
- A bug which caused computation of maximal orders in relative extensions defined by non-monic polynomials to die while computing maximal orders has been fixed.