---
title: "Magma V2.26-5 Patch Notes"
canonical: "https://docs.magma-maths.org/patchnotes/2.26-5.html"
source: "https://docs.magma-maths.org/patchnotes/2.26-5.md"
---

<a id="magma-v2-26-5-patch-notes"></a>
# Magma V2.26-5 Patch Notes

## Commutative Algebra

- A bug in primary decomposition (arising from [`PrimeComponents`](../AlgebraicGeometry/Schemes/schemes-global.md#function-primecomponents-sch) applied to a scheme) has been fixed.  Reported by C. Rito.

## Hyperelliptic Curves

- A bug in `TwoCoverDescentInternal` was found and fixed by M Stoll. When the degree of the defining polynomial is odd and the leading coefficient is not a square, the image of the point at infinity on the curve in the Selmer set was computed wrongly.
- A bug in the machinery for constructing the quotient of a curve was found and fixed by M Stoll. The bug could cause errors in the intrinsic `SquareFreePart` which in turn is used by the intrinsics [`CurveQuotient`](../AlgebraicGeometry/AlgebraicCurves/crv_isos.md#function-curvequotient-grpautcrv) and [`IsHyperelliptic`](../AlgebraicGeometry/AlgebraicCurves/global-curvepl.md#function-crv-ishyp).

## p-adic Rings and their Extensions

- The comment attached to [`SetPrecision`](../ModularArithmeticGeometry/ModularForms/q-expansions.md#function-setprecision-modfrm-rngintelt) has been adjusted to clarify that it changes the `DefaultPrecision`s rather than the actual precisions of a ring or field and its coefficient rings. Reported by E. Costa.
- An improvement recently made to `Factorization` of polynomials has been fixed. Reported by M. Stoll.