---
title: "Magma V2.12-15 Patch Notes"
canonical: "https://docs.magma-maths.org/patchnotes/2.12-15.html"
source: "https://docs.magma-maths.org/patchnotes/2.12-15.md"
---

<a id="magma-v2-12-15-patch-notes"></a>
# Magma V2.12-15 Patch Notes

## Class Fields of Number Fields

- `IsNormal` and `IsAbelian` would cause an infinite recursion if called with parameters `All` or `Over` and if the conductor of the extensions is not invariant under the automorphisms provided.

## Codes

- A bug in testing isomorphism of two codes has been fixed. Bug reported by Gabriele Nebe.

## Function Fields

- A bug involving the zero divisor and representations of divisors as a linear combination of places has been fixed.

## Groups

- Incorrect generators for 3D4, 2E6, 2A returned by [`ChevalleyGroup`](../FiniteGroups/AlmostSimpleGroups/standard.md#function-chevalleygroup-monstgelt-rngintelt-fldfin) when $q\gt 2^{20}$ have been fixed. Bug reported by Henrik Baarnhielm.
- The primitive groups database was badly constructed at degrees 3 and 4 and this has been fixed. In particular, the number of groups at these degrees has been corrected to 2, where 4 had been claimed but not supplied.
- `RandomProcess` caused an internal error when called on a group where no generators are known (e.g. matrix groups over non-standard rings).

## Lattices

- A bug in testing isometry of two lattices has been fixed. Bug reported by Ivan Middleton.

## Local Rings and Fields

- `AutomorphismGroup` now works properly on trivial extensions.
- A runtime error when powering zero elements in low-precision rings has been fixed.
- The fact that `UnitGroup` of infinite precision rings is not supported is now asserted with a proper error message. Furthermore a technical problem with UnitGroup (the use of a non-existing function) has been fixed.
- A problem when computing `Log``(1)` in a variable precision ring has been fixed.
- A bug involving the computation of characteristic polynomials of local ring elements relative to their parent has been fixed.
- A problem concerning the computation of the minimal polynomial of 0 has been solved.

## Number Fields

- `InfinitePlaces` would generate incorrect answers in relative extensions with real embeddings.
- Several memory leaks have been fixed. This affects, in particular, the computation of class groups, all computations involving real or complex conjugates of algebraic numbers and the computation of conductors.
- A bug that caused the splitting of small primes in large composite extensions to loop for ever has been fixed.

## Polynomial Rings

- A bug in factorization of polynomials over function fields has been fixed. Bug reported by Kwankyu Lee.

## Quaternion Algebras

- `Norm` now gives correct output for scalar entries.

## RModules

- `HasComplement` would return only one value on trivial input instead of the required two.

## Real Field

- `IsIntegral` is now working.
- Some memory leaks have been fixed. The leaks affected large parts of the number fields, the NFS and almost all real valued functions.

## Schemes

- Some memory management bugs in arithmetic of divisors of curves have been fixed.