import Mathlib.RingTheory.Ideal.Basic import Mathlib.RingTheory.Noetherian import Mathlib.Order.KrullDimension import Mathlib.RingTheory.Artinian import Mathlib.RingTheory.Ideal.Quotient import Mathlib.AlgebraicGeometry.PrimeSpectrum.Basic variable {R : Type _} [CommRing R] -- Repeats the definition by Monalisa noncomputable def length : krullDim (Submodule _ _) -- The following is Stacks Lemma 10.60.5 lemma dim_zero_Noetherian_iff_Artinian (R : Type _) [CommRing R] : IsNoetherianRing R ∧ krull_dim R = 0 ↔ IsArtinianRing R := by sorry #check IsNoetherianRing -- The following is Stacks Lemma 10.53.6 lemma IsArtinian_iff_finite_length : IsArtinianRing R ↔ ∃ n : ℕ, length R R ≤ n := by sorry