Magma V2.28-19 Patch Notes

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.