Geodesic
On a Conjecture of Hanna Neumann
Glasgow mathematical journal, Tome 2 (1956) no. 1, pp. 13-17

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In what follows, groups are written additively, and commutators are denoted by brackets:A group is metabelian if it satisfies the lawIt is conceivable, though not plausible, that this law is equivalent to a law, or a set of laws, in only three variables, or even two. The present note shows that this is not the case. 
Neumann, B. H. On a Conjecture of Hanna Neumann. Glasgow mathematical journal, Tome 2 (1956) no. 1, pp. 13-17. doi: 10.1017/S2040618500033384
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