Geodesic
Cotorsion pairs and degreewise homological model structures
Homology, homotopy, and applications, Tome 10 (2008) no. 1, pp. 283-304.

Voir la notice de l'article provenant de la source International Press of Boston

Let $C$ be an abelian category. We show that under certain hypotheses, a cotorsion pair $(A, B)$ in $C$ may induce two natural homological model structures on $Ch(C)$. One is such that the (trivially) cofibrant objects form the class of (exact) complexes $A$ for which each $A_n ∈ A$. The other is such that the (trivially) fibrant objects form the class of (exact) complexes $B$ for which each $B_n ∈ B$. Special cases of these model structures such as Hovey’s “locally free” model structure and “flasque” model structure have already appeared in the literature. The examples support the belief that any useful homological model structure comes from a single cotorsion pair on the ground category $C$. Furthermore, one of the two types of model structures we consider requires surprisingly few assumptions to exist. For example, Theorem 4.7 implies that every cotorsion pair $(A, B)$ of $R$-modules which is cogenerated by a set gives rise to a cofibrantly generated homological model structure on $Ch(R)$.
DOI : 10.4310/HHA.2008.v10.n1.a12
Classification : 18G55, 55U35
Keywords: cotorsion pair, chain complexes, model structure 
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James Gillespie. Cotorsion pairs and degreewise homological model structures. Homology, homotopy, and applications, Tome 10 (2008) no. 1, pp. 283-304. doi : 10.4310/HHA.2008.v10.n1.a12. http://geodesic.mathdoc.fr/articles/10.4310/HHA.2008.v10.n1.a12/

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