Description: New way ( elv , and the theorems beginning with "el2v" or "el3v") to shorten some proofs. (Contributed by Peter Mazsa, 16-Oct-2020)
Ref | Expression | ||
---|---|---|---|
Hypothesis | el3v1.1 | |- ( ( x e. _V /\ ps /\ ch ) -> th ) |
|
Assertion | el3v1 | |- ( ( ps /\ ch ) -> th ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | el3v1.1 | |- ( ( x e. _V /\ ps /\ ch ) -> th ) |
|
2 | vex | |- x e. _V |
|
3 | 2 1 | mp3an1 | |- ( ( ps /\ ch ) -> th ) |