Change log for Magma V2.28-13 (Released 7/9/2024)

Algebraic Number Theory

·Some crashes in LMFDBLabel for ideals of orders of number fields have been fixed. Reported by D. Roe.

·Some crashes in OptimizedRepresentation involving the dynamic extension of precision for roots of the defining polynomial have been fixed. Reported by A. Brumer and A. Pacetti.

Commutative Algebra

·An obscure crash in radical decomposition of multivariate ideals over the rational field (coming from L2Quotients) has been fixed Reported by E. O'Brien.

·An incorrrect result in Groebner basis computation over the integer ring (coming from MinimalAssociatedPrimes) has been fixed. Reported by E. O'Brien.

·The computation of Groebner bases of integer rings or non-fields has been improved when there is a large redundancy in the input. Example input given by R. Bommel.

Curves

·A crash in ZetaFunction has been fixed. Reported by E. Costa.

·A crash in maps involving point sets of curves has been fixed. Reported by N. Swanson.

Groups

·A bug in testing an automorphism of a pc-group for being an inner automorphism IsInner has been fixed. Bug reported by D. Roe.

·A bug in GroupName (incorrectly naming a chief factor) has been fixed. Bug reported by D. Roe.

·A bug in the construction of automorphisms of a pc-group has been fixed. Bug reported by D. Roe as problems with Holomorph, OuterFpGroup, and the construction of invalid automorphisms.

·A crash when calling IsCharacter on a generalised character of norm 1 has been fixed. Reported by K. Andersen.

·A crash when using the !! operator with permutation groups defined on non-standard supports has been fixed. Reported by F. Manners.

·A problem when using IdentifyGroup has been fixed. Bug report by D. Roe.

Local Fields

·A bug in FrobeniusElement due to p-adic precision has been fixed. Reported by J. Jones.