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Magma V2.18-11 Patch Notes

Patch release for Magma V2.18-11. Updated areas: Abelian Fields, Elliptic Curves, Galois Theory, Graphs, Integer Ring and 5 more.

10 areas

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 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 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.

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