Change log for Magma V2.28-8 (Released 19/4/2024)

Arithmetic Geometry

·A failure in IsIsomorphic for analytical Jacobians has been fixed. Reported by R. Visser.

Commutative Algebra

·A crash in polynomial factorisation over function fields of projective spaces has been fixed. Reported by J. Rouse.

·A crash in Groebner basis computation for a special type of monomial order and in characteristic zero has been fixed. Reported by M. Stoll.

·A crash in Groebner basis computation in multi-threaded mode on the non-AVX Intel-64 version has been fixed. Reported by L. Ran.

·A crash in free resolution has been fixed. Reported by B. Nasserden.

Complex Field

·A crash in Roots for polynomials over complex fields has been fixed. Reported by M. Stoll.

Function Fields

·A crash in working with elements of a quotient of an order of a function field has been fixed. Reported by M. Bombar.

I/O

·Some unexpected print outputs have been fixed. Reported by E. Costa.

Integer Ring

·An obscure crash in the MPQS algorithm for a certain class of moderately small integers has been fixed. The MPQS algorithm has also been sped up in general for smaller integers (up to 50 decimal digits, roughly). Issue reported by R. Visser.

Lattices

·A slowdown in LLL where the number of rows was much more than the number of columns (arising from the computation of Hecke operators) has been fixed. Reported by M. Khawaja.

Matrices

·A crash and slowdown in matrix nullspace computation over cyclotomic fields has been fixed. Reported by A. Sutherland.

Schemes

·A crash in PointSearch for ambient spaces has been fixed. Reported by J. Rouse.