Change log for Magma V2.10-12 (Released 19/7/2003)

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,) 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.