Change log for Magma V2.14-8 (Released 20/12/2007)

Codes

·Computation of automorphisms of a binary code and isomorphism between binary codes has been returned to the algorithm used in V2.9 and earlier. This corrects a problem introduced in V2.10 which considerably slowed down some of these computations.

Groups

·Modified construction of compact presentations for pc-groups to speed up both making presentation and reconstructing the group.

·Fixed bug in UnlabelledCayleyGraph of finitely presented group.

Language

·A crash in functions with variable numbers of arguments has been fixed.

Number Fields

·A bug with TraceMatrix when applied to number fields defined using non-monic polynomials has been fixed. Without this fix, the trace matrix would be wrong (lacking denominators) and would induce wrong results in all further trace computations.

·A bug in the computation of common overworlds has been fixed. Without this fix, Magma would case internal errors.

·A bug in the computation of AbsoluteLogarithmicHeight when the number field was defined by a non-monic polynomial has been fixed.

Polynomials

·Problems with polynomials over residue class rings have been fixed. Reported by M. Kiermaier.

·A bug in polynomial factorization over trivial quotient rings has been fixed. Reported by J. Marhenke.