Description: Sethood condition for the restricted converse epsilon relation. (Contributed by Peter Mazsa, 24-Sep-2018)
Ref | Expression | ||
---|---|---|---|
Assertion | cnvepresex |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cnvepres | ||
2 | id | ||
3 | abid2 | ||
4 | vex | ||
5 | 3 4 | eqeltri | |
6 | 5 | a1i | |
7 | 2 6 | opabex3d | |
8 | 1 7 | eqeltrid |