--- title: "Magma V2.11-9 Patch Notes" canonical: "https://docs.magma-maths.org/patchnotes/2.11-9.html" source: "https://docs.magma-maths.org/patchnotes/2.11-9.md" --- # Magma V2.11-9 Patch Notes ## 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. ## Differential Operator Rings - 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. ## Geometry - An error in projective closure maps involving projective spaces with more than one grading has been fixed. ## Groups - 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. ## Invariant Theory - A bug in the computation of primary invariants over quadratic fields has been fixed. Bug reported by Eric Rains. ## Rings and Fields - 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`](../BasicRings/FiniteFields/polynomial.md#function-allirreduciblepolynomials-fldfin-rngintelt) 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. ## Sets and Sequences - `IsNull` now works correctly for `GSets`. - Sequences can now be used as indices for indexed sets. ## System - 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`](../MagmaLanguage/EnvironmentAndOptions/Set-Get.md#function-setmemorylimit-rngintelt) and [`GetMemoryLimit`](../MagmaLanguage/EnvironmentAndOptions/Set-Get.md#function-getmemorylimit) now work properly on 64-bit systems.