Change log for Magma V2.12-13 (Released 10/10/2005)

Extensions of Rings

·The LCM of ideals of number fields and function fields has been improved.

·The simplification of elements in relative extensions was wrong in rare circumstances, which could have produced wrong results in set based operations. Bug reported by M. Grassl.

·SwapExtension for rings produced an error when the smaller extension was defined by a non-monic polynomial.

·A problem coercing low precision elements into ramified p-adic fields has been fixed.

Graphs

·Assigning of zero labels has been fixed.

·An ambiguous signature match error when using Contract has been fixed.

Groups

·A group of order 962280 has been added to the perfect group database. Lower degree permutation representations have been found for 3 other groups. Updates supplied by Derek Holt.

Strings

·A check for overflow in cat has been inserted (bug reported by M. Grassl).