Remark 10.12.13. For R-modules N, if the functor -\otimes _ R N is exact, i.e. tensoring with N preserves all exact sequences, then N is said to be flat R-module. We will discuss this later in Section 10.39.
Remark 10.12.13. For R-modules N, if the functor -\otimes _ R N is exact, i.e. tensoring with N preserves all exact sequences, then N is said to be flat R-module. We will discuss this later in Section 10.39.
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