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| Authors: | Xiaoyan Yang Zhongkui Liu |
| Affiliation: | 1.Department of Mathematics,Northwest Normal University,Lanzhou,China |
| Abstract: | 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. |
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