Geodesic
Powers of Genus two in Free Groups
Canadian mathematical bulletin, Tome 33 (1990) no. 3, pp. 342-344

Voir la notice de l'article provenant de la source Cambridge University Press

The general problem is to express an element of the derived group of a free group as a product of a minimal number of commutators. An old conjecture is settled in the negative, and a new conjecture and a number of related questions are posed. 
Edmunds, Charles C.; Rosenberger, Gerhard. Powers of Genus two in Free Groups. Canadian mathematical bulletin, Tome 33 (1990) no. 3, pp. 342-344. doi: 10.4153/CMB-1990-057-3
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