Hello,

I am developping a library for computing in invariant rings of
permutations groups. So far, I am using MuPAD for this, but I am
currently rewritting some parts in C++, and may as well use this
occasion to switch to Gap for the rest. I spent the afternoon browsing
through the manual, and it seems that about all the features I need
are available (plus plenty of new ones!).

I have a few questions regarding this:

- are there any benchmarks for comparing the speed of basic
manipulations of polynomials between MuPAD and Gap
- are there functions in gap to compute series expansions of rational
functions ?
- is the Polya enumeration implemented ? (Consider the action of a
permutation group on lists containing elements with given weights,
and compute the generating series of the orbits).

Thanks in advance,

Best regards,
						Nicolas
-- 
Nicolas M. Thiéry "Isil", 412 Washington Avenue, 80403 Golden Colorado (USA)
Mél: nthiery@mines.edu, Tél: (303)273-5492, Fax: (303)273-3875
WWW: <URL:http://www.mines.edu/~nthiery/>