Definition 37.55.1. Let $f : X \to S$ be a morphism of schemes which is locally of finite type. Let $\mathcal{F}$ be a quasi-coherent $\mathcal{O}_ X$-module. We say $\mathcal{F}$ is finitely presented relative to $S$ or of finite presentation relative to $S$ if there exists an affine open covering $S = \bigcup V_ i$ and for every $i$ an affine open covering $f^{-1}(V_ i) = \bigcup _ j U_{ij}$ such that $\mathcal{F}(U_{ij})$ is a $\mathcal{O}_ X(U_{ij})$-module of finite presentation relative to $\mathcal{O}_ S(V_ i)$.

In your comment you can use Markdown and LaTeX style mathematics (enclose it like $\pi$). A preview option is available if you wish to see how it works out (just click on the eye in the toolbar).