Description: The class of sets verifying a tautology is the universal class. (Contributed by BJ, 24-Jul-2019) (Proof modification is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | bj-abv |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax-5 | ||
2 | vexwt | ||
3 | 1 2 | alrimih | |
4 | eqv | ||
5 | 3 4 | sylibr |