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Magma V2.25-5 Patch Notes

Patch release for Magma V2.25-5. Updated areas: Algebraic Number Fields, Algebraic Number and Function Fields, Coding Theory, Commutative Algebra, Galois Groups and 7 more.

12 areas

Algebraic Number Fields

  • Determining whether an element of a number field is an \(n\)th power has been made more efficient. Reported by M. Grassl.

  • Calculating a MaximalOrder given Discriminant or Ramification parameters has been improved. Reported by L. Dembélé.

Algebraic Number and Function Fields

  • A bug in coercion of number field and function field elements into coefficient rings in a tower has been fixed. Reported by M. Grassl.

Coding Theory

  • An error message for CyclicCode has been fixed to refer to the correct argument number. Reported by A. Previtali.

Commutative Algebra

Galois Groups

  • A bug in GaloisGroup has been fixed. Reported by J. Barker and M. Soderholm.

Groups

  • A crash when computing the soluble radical of a matrix group over a finite field has been fixed.

  • The position of the second column when printing conjugacy classes or a subgroup lattice has been slightly modified in some cases.

  • An bug in Centre for p-groups has been fixed. Reported by H. Dietrich.

I/O

  • The undocumented intrinsics SetLinePrefix and GetIndentLevel have been removed.

  • User indentation is no longer ignored if screen columns is 0, and may now exceed the screen columns.

  • Fixed a bug with pipes on OS X, that could cause POpen to return a pipe that incorrectly re-used internal data of a previous POpen call. Reported by U. Thiel.

Maps

  • Map application has been fixed so that automatic coercion into the domain is avoided when the input is a sequence of elements in the domain itself. Issue reported by G. Blanco.

Numerical Algebra

  • A crash in NumericalSolution for non-trivial matrices has been fixed. Reported by D. Barth.

Polynomial Rings

  • The &* operator, when applied to univariate polynomials of the same degree, has been sped up. Issue reported by M. Monagan.

  • A bad slow-down in polynomial factorization over finite fields when there are a very large number of factors has been fixed. Reported by M. Monagan.

  • The Shoup-based algorithm for polynomial factorization over finite fields has had some further speedups.

Representation Theory

Schemes

  • It is now possible to construct a map between a projective scheme and an affine scheme with one of the defining polynomials being 0. Reported by A. Laface.

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