Change log for Magma V2.21-10 (Released 30/1/2016)

Aggregates

·A crash when merging sets with unusual universes has been fixed. Reported by T. Feng.

Algebraic Curves

·A runtime error for certain examples of RegularModel has been fixed. Reported by A. Sutherland.

·An internal error in GapNumbers given a divisor and a place of a curve has been fixed.

Finite Fields

·A crash which would sometimes arise when creating a large lattice of finite fields of the same characteristic has been fixed. There is also a general speedup when many default fields of the same characteristic are created in succession.

LLL Reduction

·An occasional error with precision at the 53-bit cusp was fixed. Reported by M. Kirschmer.

Matrices

·A crash in CharacteristicPolynomial for matrices has been fixed. Reported by M. Kirschmer.

Number Fields

·An internal error in ClassNumber(D) for D in the sieve range has been fixed. Note: there was no error for ClassGroup, etc.

·A runtime error in the map returned by PicardGroup in some cases has been fixed. Reported by S. Marseglia.

p-adic Matrices

·A problem with precision when computing determinants of p-adic matrices was fixed.