--- title: "Magma V2.15-14 Patch Notes" canonical: "https://docs.magma-maths.org/patchnotes/2.15-14.html" source: "https://docs.magma-maths.org/patchnotes/2.15-14.md" --- # Magma V2.15-14 Patch Notes ## Algebraic Geometry - A memory leak in [`Saturate`](../AlgebraicGeometry/Schemes/schemes-creation.md#function-saturate-sch-ref) has been removed. ## Coding Theory - A crash in [`SternsAttack`](../CodingTheory/LinearCodes/codingcrypto.md#function-sternsattack-code-modtupfldelt-rngintelt-rngintelt-rngintelt) has been fixed. Reported by R. Niebuhr. ## Commutative Algebra - Crashes in the function `CohomologyDimension` (related to [`Regularity`](../CommutativeAlgebra/ModulesOverMultivariateRings/free-resolution.md#function-regularity-modmpol)) and `Twist` have been fixed. Reported by E. Rains. ## Cyclotomic Fields - A memory problem occuring in the case of a sparse cyclotomic field of small degree where the conductor is a large integer, has been fixed. ## Graphs - A problem in graphs when nauty data was not present has been fixed. Reported by D. Leemans. ## Groups - A crash in `FPGroup` when applied to a regular permutation group has been fixed. Bug reported by S. Humphries. - A problem defining homomorphisms with domain an abelian group having some trivial generators has been fixed. Previously this generated a runtime error. - A problem with the group name used by the print option of `pQuotient` has been fixed. The problem was caused by a recent bug fix. Reported by G. Havas. - A crash in the matrix groups base and strong generating set code has been fixed. Bug reported by M. Giudici. ## Groups of Lie type - [`RelativeRootElement`](../LieTheory/ChevalleyGroups/construction.md#function-relativerootelement-grplie-rngintelt-fldelt) was incorrectly trying to coerce its output into the twisted group. - `Order` was giving incorrect values when the group was constructed from a root subdatum with smaller root space than the original root datum. - `Kernel` works for homomorphism from a group of Lie type which is known to be injective. - `IsSimple` has been implemented for groups of Lie type. The intrinsic `IsIrreducible` is now deprecated for this type. ## Number Fields - A string of problems with non-simple extensions defined over a number field having a non-integral denominator have been fixed. Without this fix an internal error would be triggered. ## Polynomial Rings - A problem with non-unique elements in polynomial quotient rings has been fixed. Reported by M. Stoll. - A crash in powering of elements in a chain of recursive rings has been fixed. Reported by M. Stoll. ## Representation Theory - A bug in `SymmetricRepresentation` (which computes an irreducible module for a symmetric group), which occurs when the non-`Specht` algorithm is used, has been fixed; the matrices being returned were acting on the left rather than the right as Magma expects. Reported by M. Wildon.