Geodesic
Goursat's Theorem and Homological Algebra
Canadian mathematical bulletin, Tome 7 (1964) no. 4, pp. 597-608

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

This expository note consists of two parts: In the first we present a homological formulation of Goursat's theorem. In the second we indicate how some rudimentary concepts of homological algebra can be introduced with the help of this form of Goursat's theorem. The second part is addressed to those readers with an algebraic background who wish to be initiated into homological algebra as painlessly as possible. The ideas developed here are close to the spirit of [5, Chapter II, § 6], where further references may be found. In fact, these ideas are very much in the air, and any originality in the present note is purely coincidental. 
Lambek, Joachim. Goursat's Theorem and Homological Algebra. Canadian mathematical bulletin, Tome 7 (1964) no. 4, pp. 597-608. doi: 10.4153/CMB-1964-055-7
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