Crystal Maple package

Crystal

Crystal implements a theorem of Kashiwara as a MAPLE package, crystal. This is a completely rewritten version of crystal and is not compatible with the old version.

This new version is

faster,
can do multiple tensor products,
can do branching rules (restriction to a simple subalgebra).

The text file for the crystal package which works in MAPLEV3, MAPLEV4 (MAPLEV5 requires some small revisions - download crystal2.mpl instead) is crystal2.mpl (~20K). The modifications for MAPLE6 will hopefully be finished by the end of the summer of 2000.

For help with crystal, see

crystal documentation
in MAPLEV5 and above, test file #1 and test file #1 are example worksheets,
in MAPLEV4, the following .mws help files may be useful (they may be saved in your maple help directory by choosing "help", "save in database..." in MAPLEV4):

All crystal material is copylefted

Copyleft 1997 by David Joyner, Roland Martin

Permission is granted to anyone to to use, modify, or redistribute this software freely, subject to the following restrictions:

The authors accepts no responsibility for any consequences of this software and makes no guarantee that the software is free of defects.
The origin of this software must not be misrepresented, either by explicit claim or by omission.
This notice and the copyleft must be included in all copies or altered versions of this software.
This software may not be included or redistributed as part of any package to be sold for profit without the explicit written permission of the authors.

Some related links:

created 4-97, last updated 6-6-2004.

wdj@usna.edu