Metamath Proof Explorer

Theorem grumnueq

Description: The class of Grothendieck universes is equal to the class of minimal universes. (Contributed by Rohan Ridenour, 13-Aug-2023)

Ref Expression
Assertion grumnueq ⊢ Univ = k | ∀ l ∈ k 𝒫 l ⊆ k ∧ ∀ m ∃ n ∈ k 𝒫 l ⊆ n ∧ ∀ p ∈ l ∃ q ∈ k p ∈ q ∧ q ∈ m → ∃ r ∈ m p ∈ r ∧ ⋃ r ⊆ n

Proof

Step Hyp Ref Expression
1 eqid ⊢ k | ∀ l ∈ k 𝒫 l ⊆ k ∧ ∀ m ∃ n ∈ k 𝒫 l ⊆ n ∧ ∀ p ∈ l ∃ q ∈ k p ∈ q ∧ q ∈ m → ∃ r ∈ m p ∈ r ∧ ⋃ r ⊆ n = k | ∀ l ∈ k 𝒫 l ⊆ k ∧ ∀ m ∃ n ∈ k 𝒫 l ⊆ n ∧ ∀ p ∈ l ∃ q ∈ k p ∈ q ∧ q ∈ m → ∃ r ∈ m p ∈ r ∧ ⋃ r ⊆ n
2 id ⊢ x ∈ Univ → x ∈ Univ
3 1 2 grumnud ⊢ x ∈ Univ → x ∈ k | ∀ l ∈ k 𝒫 l ⊆ k ∧ ∀ m ∃ n ∈ k 𝒫 l ⊆ n ∧ ∀ p ∈ l ∃ q ∈ k p ∈ q ∧ q ∈ m → ∃ r ∈ m p ∈ r ∧ ⋃ r ⊆ n
4 id ⊢ x ∈ k | ∀ l ∈ k 𝒫 l ⊆ k ∧ ∀ m ∃ n ∈ k 𝒫 l ⊆ n ∧ ∀ p ∈ l ∃ q ∈ k p ∈ q ∧ q ∈ m → ∃ r ∈ m p ∈ r ∧ ⋃ r ⊆ n → x ∈ k | ∀ l ∈ k 𝒫 l ⊆ k ∧ ∀ m ∃ n ∈ k 𝒫 l ⊆ n ∧ ∀ p ∈ l ∃ q ∈ k p ∈ q ∧ q ∈ m → ∃ r ∈ m p ∈ r ∧ ⋃ r ⊆ n
5 1 4 mnugrud ⊢ x ∈ k | ∀ l ∈ k 𝒫 l ⊆ k ∧ ∀ m ∃ n ∈ k 𝒫 l ⊆ n ∧ ∀ p ∈ l ∃ q ∈ k p ∈ q ∧ q ∈ m → ∃ r ∈ m p ∈ r ∧ ⋃ r ⊆ n → x ∈ Univ
6 3 5 impbii ⊢ x ∈ Univ ↔ x ∈ k | ∀ l ∈ k 𝒫 l ⊆ k ∧ ∀ m ∃ n ∈ k 𝒫 l ⊆ n ∧ ∀ p ∈ l ∃ q ∈ k p ∈ q ∧ q ∈ m → ∃ r ∈ m p ∈ r ∧ ⋃ r ⊆ n
7 6 eqriv ⊢ Univ = k | ∀ l ∈ k 𝒫 l ⊆ k ∧ ∀ m ∃ n ∈ k 𝒫 l ⊆ n ∧ ∀ p ∈ l ∃ q ∈ k p ∈ q ∧ q ∈ m → ∃ r ∈ m p ∈ r ∧ ⋃ r ⊆ n