Definition 35.4.15. The functor $f^*: \text{Mod}_ R \to DD_{S/R}$ is called *base extension along $f$*. We say that $f$ is a *descent morphism for modules* if $f^*$ is fully faithful. We say that $f$ is an *effective descent morphism for modules* if $f^*$ is an equivalence of categories.

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