This appendix is the manual for a set of functions written to assist the reader to understand and apply the theorems on GL(n, R) set out in the main part of the book. The software for the package is provided over the World Wide Web at http://www.math.waikato.ac.nz/~kab and is in the form of a standard Mathematica add-on package. To use the functions in the package you will need to have a version of Mathematica at level 4.0 or higher.