CAIN


LiE


A Computer algebra package for Lie group computations

LiE is a computer algebra system that is specialised in computations involving (reductive) Lie groups and their representions. Four descriptions of the package are available:

Version 2.2

Now a new version, 2.2 is released. Marc van Leeuwen has made this version from 2.0 by streamlining the source code; the main results are the disappearance of some mathematical and memory bugs, a CWEBx documentation for most of the source code, and more or less the same functionality (an exception being the characters of the symmetric group, which have now become polynomials). The changes since version 2.1 are minimal to the user: the main difference is that `lex' is no longer used to build a lexical analyser, which improves portability and allows for a slightly more liberal lexical structure.

Obtaining LiE

Since July 1996, LiE is publically available for free. There are various versions of the software you may obtain:

If you want to try out some computations with LiE without having to install it, you can invoke LiE through the WWW, by simply filling in a form, and the result will be displayed.

If you want to compile and run the program, but need no documentation of the source files, you can fetch the tarfile for a compile only version.

You can also get a much more documented version of the source files, which use the CWEBx software documentation system. To use this version you need to download and compile the CWEBx system in addition to the documented sources for LiE.

Detailed instruction of how to install each of these versions can be found in the README files contained in the individual tarfiles.


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