Description: The universe contains every set. (Contributed by NM, 11-Sep-2006) Remove dependency on ax-10 , ax-11 , ax-13 . (Revised by BJ, 10-Aug-2022)
Ref | Expression | ||
---|---|---|---|
Assertion | eqv | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfcleq | |
|
2 | vex | |
|
3 | 2 | tbt | |
4 | 3 | albii | |
5 | 1 4 | bitr4i | |