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 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.