English
For a local ring hom f, the contraction of the closed point of S equals the closed point of R: f^*(closedPoint(S)) = closedPoint(R).
Русский
Для локального гомоморфизма f сокращение максимальной идеала в S даёт максимальный идеал в R.
LaTeX
$$$\\mathrm{Spec}(f)^{*}(\\mathrm{closedPoint}(S)) = \\mathrm{closedPoint}(R)$$$
Lean4
@[simp]
theorem comap_closedPoint {S : Type v} [CommSemiring S] [IsLocalRing S] (f : R →+* S) [IsLocalHom f] :
PrimeSpectrum.comap f (closedPoint S) = closedPoint R :=
(isLocalHom_iff_comap_closedPoint f).mp inferInstance