Geodesic
A Problem of R. H. Fox
Canadian mathematical bulletin, Tome 24 (1981) no. 2, pp. 129-136

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

The purpose of this expository article is to familiarize the reader with one of the fundamental problems in the theory of infinite groups. We give an up-to-date account of the so-called Fox problem which concerns the identification of certain normal subgroups of free groups arising out of certain ideals in the free group rings. We assume that the reader is familiar with the elementary concepts of algebra. 
Gupta, Narain. A Problem of R. H. Fox. Canadian mathematical bulletin, Tome 24 (1981) no. 2, pp. 129-136. doi: 10.4153/CMB-1981-023-6
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