Magma V2.11-9 Patch Notes

Patch release for Magma V2.11-9. Updated areas: Commutative Algebra, Differential Operator Rings, Geometry, Groups, Invariant Theory and 3 more.

26 October 2004 8 areas

Commutative Algebra

Gröbner basis computation with the HFE option has been sped up by about 10% to 20%.
Bugs in multivariate resultants and discriminants with trivial inputs have been fixed.

For some differential operators the Newton polygon was incorrect. This has been fixed. A related error in the calculation of a Newton polynomial has been repaired.

An error in projective closure maps involving projective spaces with more than one grading has been fixed.

A bug in the setting of universes of matrix group orbits has been rectified. Bug reported by Eric Rains.
A bug in making maximal subgroups of \(PSp(4,p):2\), where \(p = 1 \mod 12\), has been fixed. Bug reported by Colva Roney-Dougal.
Crashes in !! have been fixed.

A bug in the computation of primary invariants over quadratic fields has been fixed. Bug reported by Eric Rains.

A bad value for the Discriminant parameter to MaximalOrder of algebraic fields will now result in a runtime error rather than a crash.
The handling of elements in function fields defined by non monic polynomials has been fixed.
AllIrreduciblePolynomials now works properly on all 64-bit systems.
subset now correctly takes a FldPr rather than a FldPrElt.
Expansion of function field elements at a place has been fixed.
Finding the UnderlyingField of a function field has been fixed.
Maximal printing for non-simple number fields now shows all generators.
SubOrders and EquationOrders of orders defined over non-monic polynomials were wrongly returned as orders.

In Windows, redirecting output from the Magma process to a file now results in line-by-line buffering, which is more convenient for long-running jobs.
SetMemoryLimit and GetMemoryLimit now work properly on 64-bit systems.