Lemma 29.11.5. Let S be a scheme. There is an anti-equivalence of categories
which associates to f : X \to S the sheaf f_*\mathcal{O}_ X. Moreover, this equivalence is compatible with arbitrary base change.
Lemma 29.11.5. Let S be a scheme. There is an anti-equivalence of categories
which associates to f : X \to S the sheaf f_*\mathcal{O}_ X. Moreover, this equivalence is compatible with arbitrary base change.
Proof. The functor from right to left is given by \underline{\mathop{\mathrm{Spec}}}_ S. The two functors are mutually inverse by Lemma 29.11.3 and Constructions, Lemma 27.4.6 part (3). The final statement is Constructions, Lemma 27.4.6 part (2). \square
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Comment #8440 by Elías Guisado on
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