Metamath Proof Explorer

Theorem ovexd

Description: The result of an operation is a set. (Contributed by Glauco Siliprandi, 23-Oct-2021)

Ref Expression
Assertion ovexd ⊢ φ → A F B ∈ V

Proof

Step Hyp Ref Expression
1 ovex ⊢ A F B ∈ V
2 1 a1i ⊢ φ → A F B ∈ V