--- title: "Magma V2.28-15 Patch Notes" canonical: "https://docs.magma-maths.org/patchnotes/2.28-15.html" source: "https://docs.magma-maths.org/patchnotes/2.28-15.md" --- # Magma V2.28-15 Patch Notes ## Algebraic Number Fields - An ambiguous signature match error for `Evaluate` applied to a matrix defined over a number field and a place has been fixed. ## Commutative Algebra - A very rare crash in `RadicalDecomposition` in finite characteristic has been fixed. Reported by Eamonn O’Brien. - An obscure incorrect result for `Variety` for multivariate polynomial ideals defined over finite fields has been fixed. Reported by Eamonn O’Brien. - A case where the Groebner Walk was hanging on ideals with unusual monomial orders has been fixed. Reported by Eamonn O’Brien. - Some leaks in Groebner basis computation in characteristic zero have been fixed. Reported by Ferenc Szollosi. ## Finite Fields - The function [`IrreducibleLowTermGF2Polynomial(d)`](../BasicRings/FiniteFields/polynomial.md#function-irreduciblelowtermgf2polynomial) has been fixed to use the larger external database (also called by [`IrreduciblePolynomial(GF(2), d)`](../BasicRings/FiniteFields/polynomial.md#function-irreduciblepolynomial-fldfin-rngintelt)) so that the upper limit on $d$ is now 120016. Issue reported by Jonathan Love. ## Geometry - A bug in [`AdmissiblePair`](../ModularArithmeticGeometry/RepresentationsOfLocalFields/galois.md#function-admissiblepair-reploc) in the local Galois representation associated to a modular form has been fixed. Reported by Nuno Freitas. - A bug in `Eigenform` for Hilbert modular forms has been fixed. Reported by Gonzalo Tornaría. ## Groups - A bug where [`IsSatisfied`](../FinitelyPresentedGroups/FPGroups/homomorphism.md#function-issatisfied-relelt-grpelt) with target an automatic group was disabled has been fixed. Reported by Stefan Witzel. - A bug in computation of preimages of subgroups using a matrix group change ring homomorphism has been fixed. - A crash in [`IdentifyGroup`](../FiniteGroups/DatabasesOfGroups/smlgps-database.md#function-grpdata-identifygroup) has been fixed. Reported by Eamonn O’Brien. - A crash computing the class map and power map of a permutation group has been fixed. Reported by David Roe. - An error in `AutomorphismGroup` for pc-groups has been addressed. Reported by David Roe. - A crash using `Relators` on an fp-group defined by a coset-table has been fixed. Reported by Stefan Witzel. ## Lie Theory - The implementation of `StandardRepresentation` for Lie algebras and groups of Lie type has been revised so that it correctly handles root data of composite type and root data where the root order is not ‘canonical’. Thus the bug that occurred when `StandardRepresentation` was applied to the group returned by [`SubsystemSubgroup`](../LieTheory/ChevalleyGroups/create-new-root-datum.md#function-subsystemsubgroup-grplie-setenum) has been fixed. Reported by David Craven. ## Matrices - A bug has been fixed involving subtraction of a scalar matrix and a matrix over $GF(2)$. Reported by Lewis Combes. ## Matrix Groups - A bug in [`AreGLConjugate`](../FiniteGroups/MatrixGroupsOverQAndZ/Conjugacy_Matrices.md#function-areglconjugate-algmatelt-algmatelt) for matrix groups defined over the integer ring (where [`false`](../MagmaLanguage/StatementsAndExpressions/boolean.md#literal-literal-false-false) was incorrectly returned for some conjugate groups} has been fixed. Reported by Stefano Marseglia. - A crash in `UnitGroup` for trivial matrix groups has been fixed. ## Quaternion Algebras - Magma level printing for quaternion algebras defined over number fields has been improved.