--- title: "Magma V2.28-12 Patch Notes" canonical: "https://docs.magma-maths.org/patchnotes/2.28-12.html" source: "https://docs.magma-maths.org/patchnotes/2.28-12.md" --- # Magma V2.28-12 Patch Notes ## Character Theory - A new signature for intrinsic `BaseRing` has been added - `BaseRing` of a character table or other sequence of characters returns the minimal cyclotomic field such that all character values in the given sequence can be coerced into the field. ## Commutative Algebra - A small problem in `Variety` for ideals with non-standard monomial orders has been fixed. Reported by M. Grassl. - A serious hang and related crash occurring for a certain type of very large Groebner basis computation over the rational field has been fixed. Reported by D. Platt. ## Complex Field - The computation of roots of polynomials over the complex field which involved computing even powers has been improved (so negligible real parts are not included when possible). ## Curves - The functions `LPolynomial` and `ZetaFunction` have been fixed for certain problem cases in very small characteristic. Reported by E. Costa. ## Elliptic Curves - Fixed a few places where calling [`LFunction`](../ArithmeticGeometry/EllipticCurvesOverFunctionFields/Lfunction.md#function-lfunction-crvell-fldfunrat) on an elliptic curve might reassign the generator names of already-existing polynomial rings. Reported by D. Angdinata. ## Groups - A situation where `Order` applied to infinite matrix groups defined over characteristic zero fields incorrectly returned a finite order has been fixed. Reported by S. Waldron. - A long-standing bug in defining a pc-group using a power-commutator presentation has been resolved. The bug was reported by D. Roe as a bug in [`SmallGroupDecoding`](../FiniteGroups/DatabasesOfGroups/smlgps-database.md#function-smallgroupdecoding-rngintelt-rngintelt). - A problem with matrix group element centralizer computation has been fixed. Bug reported by M. Grassl as a crash in [`GroupName`](../FiniteGroups/Groups/operation.md#function-groupname-grp). - A complaint about computing the automorphism group of a 01 matrix has been resolved. Reported by M. Grassl. ## Lattices - A crash in `IsGLZConjugate` involving short vector enumeration has been fixed. Reported by K. Andersen. ## Representation Theory - A crash in `CompositionSeries` for modules with trivial action and in characteristic zero has been fixed. Reported by L. Scheeren.