Geodesic
Schreier systems in free products
Glasgow mathematical journal, Tome 7 (1965) no. 2, pp. 61-79

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

In 1927 Schreier [8] proved the Nielsen-Schreier Theorem that a subgroup H of a free group F is a free group by selecting a left transversal for H in F possessing a certain cancellation property. Hall and Rado [5] call a subset T of a free group F a Schreier system in F if it possesses this cancellation property, and consider the existence of a subgroup H of F such that a given Schreier system T is a left transversal for H in F. 
Dey, I. M. S. Schreier systems in free products. Glasgow mathematical journal, Tome 7 (1965) no. 2, pp. 61-79. doi: 10.1017/S204061850003522X
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