Theorem el3v23

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	el3v23.1	|- ( ( ph /\ y e. _V /\ z e. _V ) -> th )
Assertion	el3v23	|- ( ph -> th )

Proof

Step	Hyp	Ref	Expression
1		el3v23.1	|- ( ( ph /\ y e. _V /\ z e. _V ) -> th )
2	1	el3v3	|- ( ( ph /\ y e. _V ) -> th )
3	2	elvd	|- ( ph -> th )