--- title: "Magma V2.18-11 Patch Notes" canonical: "https://docs.magma-maths.org/patchnotes/2.18-11.html" source: "https://docs.magma-maths.org/patchnotes/2.18-11.md" --- # Magma V2.18-11 Patch Notes ## Abelian Fields - `MaximalOrder` of an abelian field has been fixed when a component contained roots of unity in the top extension. Reported by D. Mayer. ## Elliptic Curves - A problem that caused [`PointsQI`](../ArithmeticGeometry/EllipticCurvesOverFunctionFields/two-descent.md#function-pointsqi-crv-rngintelt) to miss some points has been fixed. Reported by R. Rathbun. ## Galois Theory - A fix has been made to the memory management of straight-line polynomials used in the `GaloisGroup` computations. Reported by C. Schneider. ## Graphs - Assigning an explicitly empty sequence of edge labels to a graph and then asking for the edge labels could cause a crash. This has been fixed. Reported by A. Kasprzyk. - The directed graph constructors have been extended to allow sequences of edges to be specified rather than just sets (as was formerly the case). - Spanning trees now retain vertex labels of the containing graph (edge labels remain unretained for now). ## Integer Ring - Error checking for [`Binomial`](../BasicRings/Integers/combinatorics.md#function-binomial-rngintelt-rngintelt) has improved. - A bug which caused binomials to be computed in a very inefficient way in some cases has been fixed. ## Modules - A problem in `SymmetricPower` over non-fields has been fixed. Reported by T. Wieber. ## Number Fields - `Automorphisms` of fields of fractions whose basis is different to that of the corresponding number field have been fixed. ## Polynomial Rings - A crash in multivariate factorization over the integers with a large number of variables has been fixed. - An infinite loop in a certain polynomial factorization over number fields has been fixed. Reported by M. Grassl. ## Representation Theory - A bug in computing the character table of a group using the Dixon-Schneider algorithm has been fixed. The bug could cause the character table returned to be incomplete. Bug reported by I. M. Isaacs. ## Schemes - Construction of subschemes of length 0 ambient schemes has been fixed.