--- title: "Magma V2.28-17 Patch Notes" canonical: "https://docs.magma-maths.org/patchnotes/2.28-17.html" source: "https://docs.magma-maths.org/patchnotes/2.28-17.md" --- # Magma V2.28-17 Patch Notes ## Algebraic Number Fields - The construction of `sub<|>` orders when the right hand side contains an integer or rational has been fixed. Reported by Eran Assaf. - The deletion of quotients of orders of number fields has been fixed so that deletion of structures storing the quotients can be achieved. Reported by Eran Assaf. - A hang in `ClassGroup` (coming from a call to `RayClassGroup`) has been fixed. Reported by Armand Brumer. ## Class Field Theory - Construction of an `AbelianExtension` from a number field has been improved by increasing modular arithmetic. Reported by Markus Grassl. ## Commutative Algebra - Some crashes in Groebner basis computations for ideals defined over number fields (arising from calls to [`TwoPowerIsogenyDescentRankBound`](../ArithmeticGeometry/EllipticCurvesOverQAndNumberFields/mordell-weil.md#function-twopowerisogenydescentrankbound-crvell-fldrat-ptell-fldrat)) have been fixed. Reported by Maksym Voznyy. - A crash when creating an `"elimw"` monomial order with a weights sequence given by a range has been fixed. Reported by Eric Rains. ## Curves - The hash for places of curves has been fixed so that equal places in a set can be identified. Reported by Maarten Derickx. ## Groups - A bug in the construction of a pc-group from an automorphism group of a group has been fixed. This bug could occur when the automorphism group of a p-group was in turn a p-group, and a pc-presentation of the automorphism group was constructed. Bug reported by Benjamin Sambale. - A crash computing the kernel of a homomorphism with domain an automorphism group has been fixed. Bug reported by David Roe. - A crash when using [`IdentifyGroup`](../FiniteGroups/DatabasesOfGroups/smlgps-database.md#function-grpdata-identifygroup) after using `Complements` has been fixed. Bug reported by David Roe. - A crash computing th character table of a matrix group over a ring of type `RngOrdRes` has been fixed. Bug reported by Eamonn O’Brien. - An error when calling `MaximalSubgroups` a second time on a group (where the whole group may be included in the output) has been fixed. Bug reported by Steve Humphries. type `RngOrdRes` has been fixed. Bug reported by Eamonn O’Brien. ## Integer Ring - A hang in the MPQS factorization algorithm for a relatively small number has been fixed. Reported by Robin Visser. ## Local Rings - The computation of relative defining polynomials has been fixed. Reported by Stefano Marseglia. ## Matrices - A bug in saturation of an integer basis matrix (arising from a call to `MinimalModel`) has been fixed. Reported by Maksym Voznyy.