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11.19 (1990)

Open

(C. Sims). Is the $n$-th term of the lower central series of an absolutely free group the normal closure of the set of basic commutators (in some fixed free generators) of weight exactly $n$?

Contributor: A. Gaglione, D. Spellman

Progress

D. Jackson announced a positive answer for $n \leqslant 5$.

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