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xTras: a field theory inspired xAct package for Mathematica
Author: Teake Nutma © 2012-2014 under GPL.
Article: arXiv:1308.3493 [cs.SC]

Online documentationRelease historySource code


xTras is a field-theory inspired add-on package for xAct. Some of the extra functionality it brings is:

For more information, have a look at the online documentation or at the paper.

Latest release: 1.4.2 (Oct 30, 2014)

What's new:

The full release history can be found here.


xTras is not a stand-alone package. It depends on various packages contained in the main xAct bundle. In order to install xTras, do the following:

  1. Download and install the latest main xAct bundle, which contains xTras, from here.
  2. Download the Invar database and install it (instructions).

The premier support channel is the main xAct mailing list. If you find a bug, you can also report it over at xTras' Github issue tracker.


Q: FullSimplification doesn't work and returns the RInv::nodatabase message. What's wrong?
A: FullSimplification needs the Invar database to work. Install it from and the message should go away.