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?
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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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