> < ^ Date: Wed, 17 May 1995 15:00:00 +0200
> < ^ From: Franck Harou <fharou@maths.univ-rennes1.fr >
> ^ Subject: Help

I can reformulate more precisely my problem :

first, I have an exact sequence

0 -> K -> G -> H -> 0

H is PSL(2,Z/7Z) so order(H) is 168.
G is < x,y | x^-1 * y * x * y^-1 * x * y * x^-1 * y^-1 * x >

I try to find a presentation of K for computing the rank of K/[K,K].
I have a representation of G in PSL(2,O_3) and the homomorphism
G -> H for this presentation but it seem to give no more information because
the order of G is infinite. What could I do ?


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