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Magma V2.10-9 Patch Notes

Patch release for Magma V2.10-9. Updated areas: Geometry, Incidence Structures, Rings and Fields, System.

4 areas

Geometry

  • An error in the Chabauty function for hyperelliptic curves has been fixed. The problem is exhibited with the example: J := Jacobian(HyperellipticCurve(2*x^6 - x^4 - 2*x^3 - 2*x^2 + 2*x - 3)); D := elt<J | x^2 + 2/79*x - 181/79,3045/6241*x - 20521/6241, 2>; Chabauty(D,7);

  • An error in MordellWeilGroup of an elliptic curve has been fixed. This could cause a crash if the group of another elliptic curve had been previously calculated and certain other conditions also held.

Incidence Structures

  • A small improvement in subgraph construction: support and labels are now transferred from the supergraph to the subgraph.

  • A bug arising when deleting graphs has been fixed.

Rings and Fields

  • Some small improvements and bug fixes have been made in the automatic coercions between various p-adic rings and fields.

  • A bug in GaloisImage for \(p\ge 5\) has been fixed.

System

  • The memory management code for the Linux version has been rewritten, to work around a limitation of the Linux architecture, which previously restricted Magma to approximately 800 MB of system memory. Magma should now be able to access as much memory as possible.

  • A memory leak caused when nested aggregate structures (such as sequences of tuples) were passed to procedures that modified them has been fixed.

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