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File: README.txt
Author: Sergei
Last modified: August 30, 2009
This file is part of GRPy, a small GR-centered package.
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INSTALLATION
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GRPy has very few prerequisites. All you need are:
 - Python 2.6.2 or later
 - Sympy, the latest stable or better an SVN trunk build
 
 To install GRPy, simply untar the source tarball and make sure the
 directory is in you PYTHONPATH.
 See testtensor.py for example usage.
 
NOTES
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Note that all covariant indices are negative! (except 0 of course). Also,
note that the answers given by the predefined routines are NOT simplified
fully. This has to do with the fact that currently sympy can only perform
very trivial simnplifications and fails to simplify complicated expressions
or simply hangs. For this reason, the user is well-advised to apply the
simplification separetly, see commands like trim, together, ratsimp, radsimp
at:
http://docs.sympy.org/genindex.html

Also, note that this may be obsoleted if tensor objects are finally natively
implemented in sympy