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xAct has more than 500 A4-pages of documentation, distributed in the different packages, and accessible in different formats. Keeping documentation up to date is difficult, and I ask for help in reporting outdated pages and undocumented (or badly documented) features of the system.

xAct

This is a Wolfram Mathematica slideshow I use in my introductory talks. It is a simple and slow introduction to the system:

Notes for a course on xTensor, held in Paris in April 2009:

See also the xAct Course held in Prague in 2018 by Alfonso García-Parrado, the introduction to xAct by Teake Nutma, or the introductory tutorial by Jolyon Bloomfield.

Video of a talk by Barry Wardell: Tensor algebra made easy with Mathematica.

Check out the great collection of contributed xAct example notebooks, and add your own examples to help others learning to use xAct!

xCore

Introductory file xCoreDoc:

xPerm

Introductory file xPermDoc:

xTensor

Introductory file xTensorDoc:

Reference guide xTensorRefGuide:

xCoba

Introductory file xCobaDoc:

Invar

Introductory file InvarDoc:

Spinors

Introductory file SpinorsDoc:

NP and GHP Formalisms:

SymManipulator

Introductory file SymManipulator: