--- title: "Magma V2.19-8 Patch Notes" canonical: "https://docs.magma-maths.org/patchnotes/2.19-8.html" source: "https://docs.magma-maths.org/patchnotes/2.19-8.md" --- # Magma V2.19-8 Patch Notes ## Algebraic Function Fields - The prime selection when computing `GaloisGroup`s of polynomials over function fields of prime characteristic has been improved. - The computation of transformations in one place of the Galois group computation for reducible polynomials has been improved to avoid infinite loops. ## Commutative Algebra - Some bugs in `PrimaryDecomposition` and `Radical` involving ideals with graded orders have been fixed. ## Curves - A bug in the arithmetic and construction of automorphisms in the curve automorphism group machinery has been fixed. Reported by J. Rouse. - A bug in the preimage of a map between a function field of a curve and its representation as an algebraic function field has been fixed. Reported by J. Rouse. - A bug in the conversion of function field places to curve places in `WeierstrassPlaces` of a divisor of a curve has been fixed. Reported by M. Derickx. ## Integer Factorization - A problem with not detecting powers when stored factors were used has been resolved. For instance, $pq^2$ where $p$ was stored, and $q$ large, say $p$ is $10^{15} + 37$ and $q$ is $10^{50} + 151$. ## Matrices - Some crashes involving huge matrices over medium prime finite fields have been fixed. ## Orders and Algebraic Fields - Fixed a possible crash in `IsPrincipal` calculations applied to order ideals. - A few fixes supplied by J. Kl{ΓΌ}ners have been made to `GaloisGroup` computations. - A fix has been made to `CharacteristicPolynomial` so that properties of related orders are not altered during the computation. Reported by E. Thome. ## System - The Intel 64 AVX version has been sped up for several types of Groebner basis and linear algebra computations (up to 1.5 times faster in some cases). - User-defined types may now define a `Compare` intrinsic that will be used by system sorting operations.