Change log for Magma V2.26-9 (Released 26/10/2021)

Algebraic Number Fields

·A crash in MaximalOrder for number fields where the defining polynomial is either non-monic or non-integral has been fixed. Reported by M. Grassl.

Arithmetic Geometry

·A problem that occurs when unstable curves are input to intrinsics such as TernaryFormPotentiallyUnstablePrimes and MinimizeReduce which call it has been fixed by A.-S. Elsenhans.

·A crash in PointSearch where the number of minors of the Jacobian matrix is too large has been fixed. Reported by B. Nasserden.

Galois Theory

·A small improvement has been made to prime selection when computing the Subfields of an algebraic function field represented as an extension of another algebraic function field.

Group Theory

·A bug in MaximalSubgroups applied to groups with a composition factor PSL(3,p^2) has been fixed. Bug reported by P. Mueller as a bug in IsMaximal for permutation groups.

·Calculating the order of matrix groups of classical type has been improved by using classical recognition algorithms.

Hyperelliptic Curves

·A potential infinite loop in ReducedMinimalWeierstrassModel has been fixed. Reported by A. Sutherland.

Invariant Theory

·An bug causing an incorrect (non-minimal) result in FundamentalInvariants has been fixed. Reported by U. Thiel.

Lattices

·A crash in CloseVectors has been fixed. Reported by M. Kirschmer.

Matrices

·A bug in InvariantFactors for matrices over small finite fields has been fixed. Reported by G. Thomas.

Representation Theory

·Further improvements and bug fixes have been made to IrreducibleModules(G, RationalField()) for a pc-group G.