---
title: "Magma V2.28-10 Patch Notes"
canonical: "https://docs.magma-maths.org/patchnotes/2.28-10.html"
source: "https://docs.magma-maths.org/patchnotes/2.28-10.md"
---

<a id="magma-v2-28-10-patch-notes"></a>
# Magma V2.28-10 Patch Notes

## Elliptic Curves

- Some problems with [`DescentInformation`](../ArithmeticGeometry/EllipticCurvesOverQAndNumberFields/mordell-weil.md#function-descentinformation-crvell) have been fixed.  Reported by M. Voznyy.
- A bug has been fixed that could cause rank calculations to fail with an error message about there being no valid local points on a quadric intersection.  Reported by M. Derickx.

## Groups

- A crash in `AutomorphismGroup` with characteristic subgroups passed has been fixed.  Reported by J. Herr.

## Hyperelliptic Curves

- A crash in `TorsionSubgroup` for genus 2 curves has been fixed. Reported by A. Sutherland and fixed by S. Muller.
- The printing of hyperelliptic curves has been improved in the case that the coefficient of the y-term is negative.  Issue reported by E. Costa.

## Lattices

- An obscure case in the LLL algorithm where an unstable floating-point algorithm did not reset properly has been fixed.  Reported by E. Costa.

## Matrices

- A crash in `Submatrix` when the given sequence of row numbers has repetitions has been fixed.  Reported by M. Reid.

## Orders

- A crash when computing cyclotomic fields with extremely high orders has been fixed.  Reported by S. Chidambaram.

## System

- `SubstituteString` now checks that the search string is not empty, and raises an error if so.  Reported by M. Grassl.