If $G$ is a free group on $n>1$ generators, then $[G,G]$ is also free, being a subgroup of a free group. Is there a formula for the number of generators of this free group in terms of n?
closed as too localized by Ryan Budney, Ian Agol, Fernando Muro, Andreas Blass, Qiaochu Yuan Aug 19 '12 at 2:37
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