Lemma 28.10.5. A locally Noetherian scheme of dimension 0 is a disjoint union of spectra of Artinian local rings.
Proof. A Noetherian ring of dimension 0 is a finite product of Artinian local rings, see Algebra, Proposition 10.60.7. Hence an affine open of a locally Noetherian scheme X of dimension 0 has discrete underlying topological space. This implies that the topology on X is discrete. The lemma follows easily from these remarks. \square
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