---
title: "Magma V2.17-2 Patch Notes"
canonical: "https://docs.magma-maths.org/patchnotes/2.17-2.html"
source: "https://docs.magma-maths.org/patchnotes/2.17-2.md"
---

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# Magma V2.17-2 Patch Notes

## Arithmetic Fields

- Computing maximal orders of Kummer extensions at critical primes has been improved.

## Coding Theory

- The intrinsic [`EvenWeightSubcode`](../CodingTheory/LinearCodes/creation.md#function-evenweightsubcode-code) has been added. Suggested by A. Gulliver, provided by M. Grassl.

## Elliptic Curves

- Fixed a crash when returning the generators of an elliptic curve defined over a finite field.

## Finitely Presented Algebras

- A check has been added for `FreeAlgebra` so the number of variables is limited to 256.  Bug reported by E. Rains.

## Lie Theory

- A crash in `LieAlgebra` given a finitely presented Lie algebra has been fixed.
- A bug in `DirectSum` for toral root data, that caused a bug in ReductiveType for abelian Lie algebras, has been fixed. Reported by R. Zeier.

## Matrix Groups

- A new optional parameter `ExtDegree` has been added for intrinsic [`CongruenceImage`](../FiniteGroups/MatrixGroupsOverInfiniteFields/congruence.md#function-congruenceimage-grpmat). If the matrix group G is defined over a (rational) function field of positive characteristic, the congruence image will be defined over extension of the coefficient field of (at least) this degree.

## Sparse Matrices

- A crash involving some kinds of sparse matrices has been fixed. Also, the functions `TensorProduct`, `Support`, [`DiagonalSparseMatrix`](../MatricesLinearAlgebra/SparseMatrices/creation.md#function-diagonalsparsematrix-rng-rngintelt-rngelt), [`ScalarSparseMatrix`](../MatricesLinearAlgebra/SparseMatrices/creation.md#function-scalarsparsematrix-rngintelt-rngelt), [`IdentitySparseMatrix`](../MatricesLinearAlgebra/SparseMatrices/creation.md#function-identitysparsematrix-rng-rngelt) for sparse matrices have been added. Reported by R. Zeier.