Load the package

This loads the package from the default directory, for example $Home/.Mathematica/AddOns/Applications/xAct/ for a single-user installation under Linux. xTensor` and xPerm` are automatically loaded.

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<<xAct`xCoba`

Comparing, we see that the packages take about 10Mb  in Mathematica 5.2:

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There are six contexts: xAct`xCoba`, xAct`xTensor`, xAct`xPerm` and xAct`ExpressionManipulation` contain the respective reserved words. System` contains Mathematica's reserved words. The current context Global` will contain your definitions and right now it is empty.

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We turn off the annoying spell messages:

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Created by Mathematica  (May 16, 2008)