Magma V2.10-15 Patch Notes

Algebras¶

• A bug in the creation of sub- and quotient algebras for associative algebras has been fixed.

Group Cohomology¶

• A bug in the construction of the cohomology module for a finite matrix group over the integers has been corrected.
• Coercion in the cohomology module has been extended somewhat so as to allow a wider range of possible user inputs, e.g., for cocycles.

Rings and Fields¶

• A bug which prevented integer factorization from utilizing the MPQS algorithm under Windows has been fixed. This should significantly speed up integer factorization in the Windows build.
• A bug causing Kernel to crash with an internal error when applied to matrix algebra elements over relative number fields and over number fields defined by non-monic polynmials has been fixed.
• IsUnramified(FldAlg) now has a correct description string.
• A bug in the pSelmerGroup computation for number fields that occasionally made the pre-image function fail has been fixed.
• pSelmerGroup is fixed (the inverse of the returned map did not always work properly) and has an optional parameter "Raw" which remains to be documented.
• A bug in computations BinaryQuadraticForms involving non-fundamental discriminants has been fixed.
• A bug in the Euclidean division of quadratic fields causing internal errors and the return of incorrect results on a random basis has has been fixed.
• A bug in the parametrization of function fields with respect to a divisor has been fixed for those function fields for which it occurred (essentially rational function fields).
• Bugs in Eisenstein and WeierstrassSeries have been fixed. Delta for complex elements has been corrected.
• Several bugs which caused precision loss when manipulating polynomials over the locals have been fixed.