Magma V2.13-10 Patch Notes

Coding Theory¶

• Some bugs in the computation of the minimum Lee weight for codes over $\mathbb{Z}_4$ have been fixed.

Groups¶

• A bug in the reconstruction of p-group automorphisms on a second call to AutomorphismGroup has been fixed. Bug reported by Derek Holt.
• Internal errors when the BlocksAction routine for permutation groups was given an incorrect block system have been trapped. Bug reported by Derek Holt.
• A crash when IntegralGroup was given an infinite group argument has been fixed. This now gives a runtime error. Bug reported by Markus Grassl.

Interpreter¶

• A bad leak in the eval operator has been fixed. Reported by D. Holt.

Local Rings¶

• A bug that could cause some parentheses to be omitted when printing polynomials over some local rings has been fixed. Reported by J. Voight.

Matrices¶

• A bug in KernelMatrix for matrices over multivariate polynomial rings over the integers and having zero rows has been fixed. Reported by Andreas-Stephan Elsenhans.

Modules¶

• Missing checks for matrix spaces over rings with zero divisors have been inserted.

Monoids¶

• A crash when using a monoid with generator names assigned has been fixed. Bug reported by Klaus Brockhaus.

Number Fields¶

• Zeroes for orders and number fields returned the zeroes with not enough precision in the wrong ring (old reals).
• The embedding from cyclotomic fields, number fields and quadratic fields into real and complex fields was ignoring the precision of the target ring, the internal number field precision was used.
• An internal bug for user created prime ideals in relative extensions that could result in internal errors when the residue class fields of those ideals are used, has been fixed.
• A bug in indexform equations in arbitrary orders of cubic fields that would, in some cases, trigger an internal error has been fixed.

Polynomial Rings¶

• Localization for univariate polynomial rings over the rationals did not work when wrong arguments were being passed to it.
• Localization(RngMPol, RngMPol) is now implemented.
• Bugs in computing the squarefree factorization of polynomials over non-perfect fields have been fixed.

Residue Class Rings¶

• Any rational may now be coerced into Integers(1).