Patch Notes

Magma V2.27-9 Patch Notes

Patch release for Magma V2.27-9. Updated areas: Algebraic Number Fields, Commutative Algebra, Galois Groups, Lattices, Matrices and 3 more.

08 May 2023 8 areas

Algebraic Number Fields ¶

RelativeField(F, F) now returns a linear extension of F as documented. Reported by J. Schleucher.

Commutative Algebra ¶

A bug in Kernel for matrices defined over a field of fractions of an affine algebra has been fixed. Reported by M. Cuntz.
A crash in PrimaryDecomposition over rational function fields in higher characteristic (arising from computing divisors of points on schemes) has been fixed. Reported by M. Houben.

Galois Groups ¶

IsEasySnAn has been fixed when the input polynomial has non trivial denominators. Reported by N. Katz.

Lattices ¶

The function Orthonormalize has been improved so that it is more stable and gives a correct informative error message if there are precision problems. Issue reported by A. Budroni.

Matrices ¶

A bug in FrobeniusFormAlternating where the result did not satisfy the divisibility condition has been fixed. Reported by S. Hashimoto.

Representation Theory ¶

A bug in CompositionSeries for a QG-module when its irreducibity attribute was already set has been fixed. Reported by J. Feuerpfeil.

Sparse Matrices ¶

A crash in SetEntry when dynamically extending a sparse matrix while setting an entry to zero has been fixed. Reported by H. Yau.

Strings ¶

The versions of Position and index that take a starting offset have been moved into the kernel and are now substantially faster and more memory friendly.