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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 Keeping documentation up to date is difficult, and I ask for help in reporting outdated pages and undocumented (or badly documented) features of the system.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 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 introductory and example files by Teake Nutma, or the introductory tutorial by Jolyon Bloomfield.

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

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: