Geodesic
$n$-flat and $n$-FP-injective modules
Czechoslovak Mathematical Journal, Tome 61 (2011) no. 2, pp. 359-369.

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In this paper, we study the existence of the $n$-flat preenvelope and the $n$-FP-injective cover. We also characterize $n$-coherent rings in terms of the $n$-FP-injective and $n$-flat modules.
DOI : 10.1007/s10587-011-0080-4
Classification : 13C11, 13D07, 16D40, 16E10
Keywords: $n$-flat module; $n$-FP-injective module; $n$-coherent ring; cotorsion theory 
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Yang, Xiaoyan; Liu, Zhongkui. $n$-flat and $n$-FP-injective modules. Czechoslovak Mathematical Journal, Tome 61 (2011) no. 2, pp. 359-369. doi : 10.1007/s10587-011-0080-4. http://geodesic.mathdoc.fr/articles/10.1007/s10587-011-0080-4/

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