Theorem el3v13

Description: New way ( elv , and the theorems beginning with "el2v" or "el3v") to shorten some proofs. (Contributed by Peter Mazsa, 11-Jul-2021)

	Ref	Expression
Hypothesis	el3v13.1	|- ( ( x e. _V /\ ps /\ z e. _V ) -> th )
Assertion	el3v13	|- ( ps -> th )

Proof

Step	Hyp	Ref	Expression
1		el3v13.1	|- ( ( x e. _V /\ ps /\ z e. _V ) -> th )
2	1	el3v3	|- ( ( x e. _V /\ ps ) -> th )
3	2	el2v1	|- ( ps -> th )