[GAP Forum] subgroup lattices

[Alexander Hulpke]

Dear Forum, Dear Mr. Uskudar,

There is no Windows version of XGAP (and unlikely to ever be one).

The next release of GAP however will contain a function `DotFileLatticeSubgroups(lattice, filename)' which writes out a description of the lattice as a file viewable (as picture) with the `graphviz' suite of programs. (On a Mac, OmniGraffle does a nice job of importing and editing such files, without doubt there also is compatible Windows software.) 
As this might be of help I have made a copy of this function available under

http://www.math.colostate.edu/~hulpke/latticedot.g

Just read this file into GAP4.4.

Regards,

  Alexander Hulpke

-- Colorado State University, Department of Mathematics,
Weber Building, 1874 Campus Delivery, Fort Collins, CO 80523-1874, USA
email: hulpke at math.colostate.edu, Phone: ++1-970-4914288
http://www.math.colostate.edu/~hulpke