--- title: "Magma V2.28-7 Patch Notes" canonical: "https://docs.magma-maths.org/patchnotes/2.28-7.html" source: "https://docs.magma-maths.org/patchnotes/2.28-7.md" --- # Magma V2.28-7 Patch Notes ## Algebraic Curves - A spurious debug print in [`CurveQuotient`](../AlgebraicGeometry/AlgebraicCurves/crv_isos.md#function-curvequotient-grpautcrv) has been removed. Reported by D. Zureick-Brown. ## Commutative Algebra - A crash in [`VarietySize`](../CommutativeAlgebra/PolynomialRingIdealOperations/variety.md#function-varietysize-rngmpol) 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`](../FinitelyPresentedGroups/FPGroups/fp-group-properties.md#function-isinfinitefpgroup-grpfp) for an FP-group with one generator has been fixed. Reported by M. Grassl. ## Linear Programming - A crash in [`MinimalIntegerSolution`](../Optimization/LinearProgramming/instant-lp.md#function-minimalintegersolution-mtrx-mtrx-mtrx-mtrx) has been fixed. Reported by A. Munemasa. ## Matrix Groups - Fixed bug in [`RecognizeClassical`](../FiniteGroups/AlmostSimpleGroups/group-recognition.md#function-recognizeclassical-grpmat) where [`QuasisimpleMatrixGroup ("2L247", 24, 7)`](../FiniteGroups/DatabasesOfGroups/quasisimplematgp-data.md#function-quasisimplematrixgroup-monstgelt-rngintelt-rngintelt) was identified incorrectly as SL(24, 7). Identifed by E. O’Brien and fixed by A. Niemeyer. - Two new functions [`ProjectiveClassicalIsConjugate`](../FiniteGroups/MatrixGroupsOverGeneralRings/conjugate.md#function-projectiveclassicalisconjugate-grpmat-grpmatelt-grpmatelt) and [`ProjectiveClassicalCentraliser`](../FiniteGroups/MatrixGroupsOverGeneralRings/conjugate.md#function-projectiveclassicalcentraliser-grpmat-grpmatelt) 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.