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Patch Notes

Magma V2.23-5 Patch Notes

Patch release for Magma V2.23-5. Updated areas: Arithmetic Geometry, Coding Theory, Cyclotomic Fields, Galois Theory, Group Theory and 5 more.

10 areas

Arithmetic Geometry

  • The function TwoCoverDescent has been improved. Also, a new parameter Points has been added, which can be set to a set of rational points on the curve, to be used for an early exit when the given points exhaust the upper bound for the Selmer set computed so far.
  • The 3rd return value of the function AutomorphismGroup has been fixed for hyperelliptic curves.

Coding Theory

Cyclotomic Fields

  • A deletion problem with cyclotomic fields has been fixed. This was seen during computations with character tables and class groups.

Galois Theory

  • An internal problem with SolveByRadicals has been fixed. Reported by M. Grassl.

Group Theory

  • Various improvements have been made to the large matrix group code.

Hecke Characters

  • Some problems with coercion of the trivial character were fixed, and the code now caches ideals to ensure compatability.

Integers

  • The upper limit on PrimesUpTo has been changed so that a crash no longer ensues. Reported by M. Kirschmer.

Lattices

  • The crash involving BKZ intrinsic over the rational field has been fixed.

Polynomial Rings

  • A crash in Valuation for univariate polynomials has been fixed. Reported by M. Stoll.
  • New parameter DegreeLimit:=D added to Factorization for univariate polynomials so that only irreducible factors with degree at most the given bound $D$ are returned (this can lead to large speedups for certain base rings). The general factorization algorithm for univariate polynomials over Z or Q has also been sped up. Requested by E. González-Jiménez.

System

  • The parent of an extended type is now the power structure of ECat, not the power structure of Cat. Reported by T. Dokchitser.
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