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 
|- ( ph -> ( A F B ) e. _V )

Proof

Step Hyp Ref Expression
1 ovex 
 |-  ( A F B ) e. _V
2 1 a1i 
 |-  ( ph -> ( A F B ) e. _V )