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13.62 (1995)

Solved

Let $U$ and $V$ be non-cyclic subgroups of a free group. Does the inclusion $[U, U] \leqslant [V, V]$ imply that $U \leqslant V$?

Contributor: V. P. Shaptala

Progress

No, it does not (M. J. Dunwoody, Arch. Math., 16 (1965), 153–157).

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