Metamath Proof Explorer

Theorem uniexd

Description: Deduction version of the ZF Axiom of Union in class notation. (Contributed by Glauco Siliprandi, 26-Jun-2021)

Ref Expression
Hypothesis uniexd.1 φ A V
Assertion uniexd φ A V


Step Hyp Ref Expression
1 uniexd.1 φ A V
2 uniexg A V A V
3 1 2 syl φ A V