Lemma 29.11.12. A morphism between affine schemes is affine.
Proof. Immediate from Lemma 29.11.11 with $S = \mathop{\mathrm{Spec}}(\mathbf{Z})$. It also follows directly from the equivalence of (1) and (2) in Lemma 29.11.3. $\square$
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Comment #832 by Johan Commelin on
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