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Magma V2.10-12 Patch Notes

Patch release for Magma V2.10-12. Updated areas: Finite Planes, Groups, Linear Algebra, Linear Codes, Rings and Fields.

5 areas

Finite Planes

  • A bug in the isomorphism test for planes which caused it to hang at times has been fixed.

Groups

  • A bug in choosing base points for a degree 1 matrix group over a finite field has been fixed. Reported by Eamonn O’Brien.

  • A bug in the graphics code for \(PSL(2,\mathbb{Z})\) has been fixed. Reported by Philippe Elbaz-Vincent.

Linear Algebra

  • HorizontalJoin, VerticalJoin and DiagonalJoin for sequences and tuples of matrices has been greatly improved.

  • A serious inefficiency in DirectSum for a sequence of matrix rings has been removed as a consequence of the above change. Reported by Derek Holt.

Linear Codes

  • A bug in the isomorphism test for linear codes which could have resulted in a crash has been fixed. Reported by J. G. Maks.

Rings and Fields

  • A molten bug that occurred in infinite extension function fields (eg. function fields arising from curves or rational function fields) when trying to compute the polynomial underlying a place has been fixed.

  • Maps between a cyclotomic field and its vector space over a subfield have been rewritten.

  • A bug in the intrinsic AbsoluteField caused certain examples not to terminate.

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