Lemma 28.11.12. A morphism between affine schemes is affine.

**Proof.**
Immediate from Lemma 28.11.11 with $S = \mathop{\mathrm{Spec}}(\mathbf{Z})$. It also follows directly from the equivalence of (1) and (2) in Lemma 28.11.3.
$\square$

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## Comments (1)

Comment #832 by Johan Commelin on

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