Geodesic
Non-Abelian Torsion Theories
Canadian journal of mathematics, Tome 25 (1973) no. 6, pp. 1224-1237

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

Torsion theories have proved a very useful tool in the theory of abelian categories; for example, in one proof of Mitchell's embedding theorem (Bucur and Deleanu [3]) and in ring theory (Lambek [5]). It is the purpose of this paper to initiate an analogous theory for non-abelian categories. Originally we had hoped to prove the non-abelian analogue of Mitchell's theorem this way (Barr, [2, Theorem III (1.3)]), but so far this had not been possible. Nonetheless an interesting variety of examples fit into this theory. 
Barr, Michael. Non-Abelian Torsion Theories. Canadian journal of mathematics, Tome 25 (1973) no. 6, pp. 1224-1237. doi: 10.4153/CJM-1973-130-4
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