Magma V2.27-5 Patch Notes

Coding Theory¶

• Some spurious printing in IsIsomorphic for codes has been fixed. Reported by A. Munemasa.

Complex Field¶

• A hang in polynomial root finding over the complex field in a case where multiple complex roots had very small imaginary part (arising from computations in hyperelliptic curves) has been fixed. Reported by J. Voight.

Curves¶

• A failure in EightDescent for a certain class of curves has been fixed. Reported by R. Rathbun.

Elliptic Curves¶

• A crash in TwoDescent for elliptic curves has been fixed. Reported by R. Rathbun.
• The SelmerGroup algorithm has been improved so that it runs much faster on certain types of input. Example problem reported by J. Rouse.

Finite Fields¶

• For a finite field extension with the Zech representation but a non-primitive defining polynomial, the internal generator of the Zech-based field was not chosen uniquely; this been changed so sorting involving elements of such a field now always behaves the same, irrespective of the random seed. Issue reported by C. Rito.

Local Rings¶

• $p$-adic rings constructed as a Completion of the integers were unintentionally returned as fields. Reported by E. Assaf.

Polynomial Rings¶

• A bad slowdown in resultant computation for some types of multivariate polynomials has been fixed. Reported by N. Katz.

System¶

• Some crashes in the save/restore feature running under Mac OS X have been fixed. Reported by T. Uchiyama.
• The AVX2/CUDA version is now built for CUDA version 11.x so please upgrade your system(s) to CUDA 11 if you have been using the CUDA version 10.x Magma executable.