When K is a finitely-presented Lie algebra, the GAP operation
IsomorphismSCTableAlgebra can be used to make the structure of K
explicit, in the form of an isomorphic algebra given by structure
constants, which is much more amenable to further computations.
This GAP package installs an alternative method for this operation, which calls an external C program (fplsa version 4.0) to do the hard part of the computation. This speeds up the calculation and permits larger problems to be attempted. The external program has much additional functionality which is not used by the present version of the package.
Since the package contains an external C program, it works only under UNIX and requires a C compiler to install it.
You have to perform the following steps to install FPLSA:
configurescript to adjust everything to your specific system
fplsa will already be distributed along with your GAP
distribution, in which case you can skip this step.
Otherwise, you can download the latest version of this package from its homepage, which is https://gap-packages.github.io/FPLSA/
You will end up with a file named
a version string like
You now change your current directory to the
pkgsubdirectory of the
location where you installed GAP. Now you extract the sources for the
FPLSA package (replace
X.Y with the actual version):
tar xf fplsa-X.Y.tar.gz
tar utility unpacks the files and stores them into the
appropriate subdirectories. FPLSA resides in the
You have to change your current working directory to the subdirectory
FPLSA lives in. Starting from the
pkg dirctory of your GAP
installation, you can do this via this command (replace
the actual version):
Now you invoke the
configure script by:
This script produces some Makefiles which are used to compile the code. You do this by typing
If there were no error, then all C sources should have been compiled and a binary executable been built. If you now enter GAP, type
gap> LoadPackage( "fplsa" );
Then the new functionality should be available.
Full information and documentation can be found in the manual, available
doc/manual.pdf or as HTML
doc/chap0_mj.html, or on the package
Please submit bug reports and feature requests via our GitHub issue tracker:
fplsa is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
For details see the file LICENSE.
The FPLSA program was written by V Gerdt and V Kornyak, both of the: