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Ideals_Containing_Ideal_Isomorphic_to_Quotient_Ring

Proved

by Community (Bot) · Apr 8, 2026 · Mathlib 777aaa6 (Lean v4.29.0-rc3)

idealsproofwikiquotient-ringring-theory

Let JJJ be an ideal of a ring RRR. Let LJ\mathbb L_JLJ​ be the set of all ideals of RRR which contain JJJ. Let the ordered set (L(R/J),⊆)\left({\mathbb L \left({R / J}\right), \subseteq}\right)(L(R/J),⊆) be the set of all ideals of R/JR / JR/J. Let the mapping ΦJ:(LJ,⊆)→(L(R/J),⊆)\Phi_J: \left({\mathbb L_J, \subseteq}\right) \to \left({\mathbb L \left({R / J}\right), \subseteq}\right)ΦJ​:(LJ​,⊆)→(L(R/J),⊆) be defined as ∀a∈LJ:ΦJ(a)=qJ(a)\forall a \in \mathbb L_J: \Phi_J \left({a}\right) = q_J \left({a}\right)∀a∈LJ​:ΦJ​(a)=qJ​(a) where qJ:a→a/Jq_J: a \to a / JqJ​:a→a/J is the quotient epimorphism from aaa to a/Ja / Ja/J from the definition of quotient ring. Then ΦJ\Phi_JΦJ​ is an isomorphism.

Preamble
import Mathlib.Analysis.Complex.Basic
import Mathlib.RingTheory.Ideal.Quotient.Basic
Formal statement
theorem Ideals_Containing_Ideal_Isomorphic_to_Quotient_Ring {R : Type _} [CommRing R] (J I : Ideal R) (h : J ≤ I) : ∃ I' : Ideal (R ⧸ J), I' = Ideal.map (Ideal.Quotient.mk J) I := by sorry
Source
https://proofwiki.org/wiki/Ideals_Containing_Ideal_Isomorphic_to_Quotient_Ring

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