Geodesic
Presentations of the Trefoil Group
Canadian mathematical bulletin, Tome 16 (1973) no. 4, pp. 517-520

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

A presentation of a group G is an exact sequence of groups where F is a free group. Let l→S ⊆ F→G→1 be another presentation of G involving the same free group F. 
Dunwoody, M. J.; Pietrowski, A. Presentations of the Trefoil Group. Canadian mathematical bulletin, Tome 16 (1973) no. 4, pp. 517-520. doi: 10.4153/CMB-1973-084-8
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