Change log for Magma V2.28-10 (Released 4/7/2024)

Elliptic Curves

·Some problems with DescentInformation have been fixed. Reported by M. Voznyy.

·A bug has been fixed that could cause rank calculations to fail with an error message about there being no valid local points on a quadric intersection. Reported by M. Derickx.

Groups

·A crash in AutomorphismGroup with characteristic subgroups passed has been fixed. Reported by J. Herr.

Hyperelliptic Curves

·A crash in TorsionSubgroup for genus 2 curves has been fixed. Reported by A. Sutherland and fixed by S. Muller.

·The printing of hyperelliptic curves has been improved in the case that the coefficient of the y-term is negative. Issue reported by E. Costa.

Lattices

·An obscure case in the LLL algorithm where an unstable floating-point algorithm did not reset properly has been fixed. Reported by E. Costa.

Matrices

·A crash in Submatrix when the given sequence of row numbers has repetitions has been fixed. Reported by M. Reid.

Orders

·A crash when computing cyclotomic fields with extremely high orders has been fixed. Reported by S. Chidambaram.

System

·SubstituteString now checks that the search string is not empty, and raises an error if so. Reported by M. Grassl.