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Magma V2.28-19 Patch Notes

Patch release for Magma V2.28-19. Updated areas: Associative Algebras, Curves, Finite Fields, Graphs, Groebner Bases and 8 more.

13 areas

Associative Algebras

  • Bug in the choice of representatives in Neighbors for quaternion ideals has been corrected.

Curves

  • UniformizingParameter for points and places on a curve has been improved to return smaller elements. Reported by Maarten Derickx.

Finite Fields

  • A crash in Embed involving a mixture of default and non-default finite fields has been fixed. Reported by Yusuke Uesato.

Graphs

  • OpenGraphFile will now raise an error when the file cannot be opened or is otherwise invalid. Formerly it would print a message and return an unusable IO object. Reported by Primo\v{z} Poto\v{c}nik.

Groebner Bases

  • Some bad slowdowns in Groebner basis computation over \(Z\) or \(Q\) (when units are present) have been fixed. Reported by Raymond van Bommel.

Group Algebras

  • Error checking for quo<|> has been increased to ensure that vector representation is being used. Reported by Joseph Baine.

Groups

  • An updated version of MinimalDegreePermutationRepresentation has been supplied by Derek Holt.

  • An error in NumberingMap for permutation groups has been fixed. This bug may have caused incorrect answers to be returned when using the NumberingMap. Bug reported by Primoz Potocnik.

  • A crash in classical matrix group recognition has been fixed. This was reported as a crash in testing two p-groups for isomorphism by Primoz Potocnik and Eamonn O’Brien.

Hilbert Modular Forms

  • Fixed bug in InnerProduct, checking for an unassigned local variable. Reported by Edgar Costa.

Hyperelliptic Curves

  • Extra precision in the computation of Conductor has been allowed. Reported by Robin Visser.

Linear Codes

  • A very bad slowdown when creating a large number of linear or additive codes has been fixed. Reported by Markus Grassl.

Local Rings

  • SeriesPrinting for local rings has been improved. Reported by Rob de Jeu.

Modular Forms

  • Fixed bug in creation of spaces of modular forms with character, when the codomain of the character is not minimal. Reported by Lewis Combes.

System

  • A new parameter ExitSummary has been added to Fork (default false) so that, if selected, child processes created by Fork print the exit summary (“Total time…”) when Magma exits; by default that summary is now suppressed. Also, new intrinsics SetExitSummary/GetExitSummary allow one to set/get a flag which determines whether Magma prints the exit summary (true by default at startup). Requested by Drew Sutherland.

  • An occasional crash in the interpreter when recovering from a runtime error during a try/catch statement has been fixed.

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