Description: The range of the restricted converse epsilon is the union of the restriction. (Contributed by Peter Mazsa, 11-Feb-2018) (Revised by Peter Mazsa, 26-Sep-2021)
Ref | Expression | ||
---|---|---|---|
Assertion | rncnvepres | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rnopab | |
|
2 | cnvepres | |
|
3 | 2 | rneqi | |
4 | dfuni2 | |
|
5 | df-rex | |
|
6 | 5 | abbii | |
7 | 4 6 | eqtri | |
8 | 1 3 7 | 3eqtr4i | |