SageMath 8.9 released

[Samuel Lelièvre]

News from SageMath, the Sage Mathematics Software System!

SageMath 8.9 was released on 2019-09-29.

SageMath, also known as Sage (website: https://www.sagemath.org/),
is developed mostly by volunteers, although over the years several
developers have been paid full time or part time to work on Sage.

Sage combines over 150 free software packages, and includes over
a million lines of new code, mostly in Python and Cython.

SageMath can be tried or used online via SageCell and CoCalc:

* SageCell: http://sagecell.sagemath.org
* CoCalc: https://cocalc.com

Both have been updated to SageMath 8.9.

To install SageMath on a computer, one can use compiled versions
for most operating systems, including native installers for most
Linux distributions, for macOS, for Windows. Source files are also
available in order to compile Sage from source. For all downloads:

* http://www.sagemath.org/download.html

The announcement for a new release is typically sent a few days
after the release so that most versions will have made their way
to the download mirrors. In this case I apologise for delaying
the announcement longer than necessary.

SageMath is also available as a Docker image, and packaged for
Arch Linux, Conda, Debian, Fedora, Gentoo, Homebrew, Nix, ...
Versions available for some package managers are listed at:

* https://repology.org/metapackage/sagemath/versions

A bootable USB called SageDebianLive, and a virtual machine
appliance called SageAppliance, are also available.

Sage-Windows was also updated to SageMath 8.9.

For more detail on the various ways Sage is distributed, see:

* https://wiki.sagemath.org/Distribution

For installation instructions, see

* http://doc.sagemath.org/html/en/installation

The SageMath plugin for TeXmacs lets you use Sage from within TeXmacs:

* https://github.com/texmacs/SageMath.tm

The `sage-shell-mode` for Emacs lets you use Sage from Emacs:

* https://github.com/sagemath/sage-shell-mode

Please ask any questions and/or report any problems to Ask Sage,
our questions and answers forum, or to the sage-support mailing list,
indicating your operating system, the version of Sage and the way it
was installed, and any code that can help reproduce your problem.

* Ask Sage: https://ask.sagemath.org/
* sage-support: https://groups.google.com/group/sage-support

You can also drop by the #sagemath IRC channel on freenode.

Details about tickets closed and contributors for each release:

* http://www.sagemath.org/changelogs/

Release manager for this release: Volker Braun.

If you want to follow SageMath's development more closely,
development releases are available from the "download-latest" page;
they are announced and discussed on the sage-release mailing list;
for development discussion, check out the sage-devel mailing list
and the Sage Trac server.

* download-latest: https://www.sagemath.org/download-latest.html
* sage-release: https://groups.google.com/group/sage-release
* sage-devel: https://groups.google.com/group/sage-devel
* Sage Trac: https://trac.sagemath.org/