--- title: "Magma V2.28-21 Patch Notes" canonical: "https://docs.magma-maths.org/patchnotes/2.28-21.html" source: "https://docs.magma-maths.org/patchnotes/2.28-21.md" --- # Magma V2.28-21 Patch Notes ## Algebraic Function Fields - Incorrect deletions of quotients of orders of algebraic function fields have been fixed. Reported by Anouk Eggink. ## Commutative Algebra - A bug in `Kernel` of homs defined between modules over affine algebras has been fixed. Reported by David Benson. ## Hyperelliptic Curves - A bug in [`IsIsomorphicHyperellipticCurves`](../ArithmeticGeometry/HyperellipticCurves/transforms.md#function-isisomorphichyperellipticcurves-crvhyp-crvhyp) has been fixed. Reported by Everett Howe; fix supplied by Reynald Lercier. ## Integer Ring - The intrinsics [`ShiftLeft`](../BasicRings/Integers/operation-element.md#function-shiftleft-rngintelt-rngintelt), [`ShiftRight`](../BasicRings/Integers/operation-element.md#function-shiftright-rngintelt-rngintelt), and [`ModByPowerOf2`](../BasicRings/Integers/operation-element.md#function-modbypowerof2-rngintelt-rngintelt) now accept large values for the second argument. - A crash in [`MPQS`](../BasicRings/Integers/factor.md#function-rngint-mpqs) when the factor basis is too large has been fixed. Reported by Markus Grassl. ## Lattices - A crash in the parallel version of `LLL` has been fixed. ## Polynomial Rings - A failure in factorization for polynomials defined over function fields of trivial projective spaces of dimension 1 has been fixed. Reported by Julia Martinez Marin. - Bugs in the function [`SmallRoots`](../BasicRings/UnivariatePolynomialRings/operation-element.md#function-smallroots-rngupolelt-rngelt-rngelt) have been fixed. Reported by Gary Walsh. ## Power Series Rings - A fix has been made to `IsPower` for power series so as to return the correct precision. - New function `Coefficients(f, S, d)` for power, Laurent or Puiseux series $f$, which is equivalent to `[Coefficient(f, i / d): i in S]` but faster. ## Sets and Sequences - Trailing commas are now allowed when constructing a sequence, list, or set. ## System - Non-deterministic behaviour in the random number generation for some algorithms has been removed.