Back to Patch Notes

Magma V2.28-7 Patch Notes

Patch release for Magma V2.28-7. Updated areas: Algebraic Curves, Commutative Algebra, Finite Fields, Finitely Presented Groups, Linear Programming and 3 more.

8 areas

Algebraic Curves

  • A spurious debug print in CurveQuotient has been removed. Reported by D. Zureick-Brown.

Commutative Algebra

  • A crash in VarietySize for ideals having multiple components has been fixed. Reported by M. Grassl.

Finite Fields

  • A crash when computing discrete logarithms in several finite fields with differing degrees has been fixed. Reported by E. O’Brien.

  • The function Log(b, e) for finite field elements has been improved in the case that the base \(b\) lies in a proper subfield (by computing the logarithm in the subfield).

Finitely Presented Groups

  • A problem with IsInfiniteFPGroup for an FP-group with one generator has been fixed. Reported by M. Grassl.

Linear Programming

Matrix Groups

  • Fixed bug in RecognizeClassical where QuasisimpleMatrixGroup ("2L247", 24, 7) was identified incorrectly as SL(24, 7). Identifed by E. O’Brien and fixed by A. Niemeyer.

  • Two new functions ProjectiveClassicalIsConjugate and ProjectiveClassicalCentraliser which decide conjugacy and construct centraliser in the central quotient of a classical group. Prepared by D. Holt and E. O’Brien.

  • The algorithm to compute element centralisers in unitary groups has been greatly improved in large cases by avoiding a hard discrete logarithm problem. Issue reported by E. O’Brien and improvement supplied by G. de Franceschi.

Permutation Groups

  • A crash in Subgroups of non-standard permutation groups has been fixed. Reported by M. Rodgers.

Representation Theory

  • A crash in IsIrreducible for G-modules defined over number fields has been fixed. Reported by S. Humphries.

Back to Patch Notes