---
title: "Magma V2.11-12 Patch Notes"
canonical: "https://docs.magma-maths.org/patchnotes/2.11-12.html"
source: "https://docs.magma-maths.org/patchnotes/2.11-12.md"
---

<a id="magma-v2-11-12-patch-notes"></a>
# Magma V2.11-12 Patch Notes

## Algebraic Geometry

- Several bugs in the linear systems machinery have been fixed including those in the [`AdjointLinearSystem`](../AlgebraicGeometry/AlgebraicCurves/curves.md#function-adjointlinearsystem-crv) call.
- The `ArithmeticGenus` intrinsic has been extended to work with schemes defined in product or weighted projective ambient spaces.

## Commutative Algebra

- A bug which caused a crash when factoring polynomials over algebraic function fields has been fixed.
- Coercion from rational function field elements back to the base field has been fixed to work more generally.
- Extension has been fixed to handle the empty sequence.

## Fields

- Several bugs in relating to using Roots with polynomials over the p-adics with zero roots have been fixed.
- A bug in the coercion of elements from p-adic fields to the residue class field has been fixed.
- Problems with large towers of number fields mixing simple and non-simple extensions have been fixed. The problems were most likely to cause internal errors in polynomial factorisation.

## Groups

- A bug which caused a crash when constructing a projective unitary group over a field of size greater than $2^{20}$ has been fixed.
- A bug with `FPGroupStrong` for matrix groups, where the presentation found did not necessarily contain a presentation for each basic stabilizer (and so wasn’t a strong presentation) has been fixed.
- A bug when constructing generic abelian groups over an aggregate of integers has been fixed.