Description: Generalization of dfrab3ss , which it may shorten. (Contributed by BJ, 21-Apr-2019) (Revised by OpenAI, 7-Jul-2020)
Ref | Expression | ||
---|---|---|---|
Assertion | bj-inrab3 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfrab3 | ||
2 | 1 | ineq2i | |
3 | dfrab3 | ||
4 | 3 | ineq2i | |
5 | incom | ||
6 | in12 | ||
7 | 4 5 6 | 3eqtr4i | |
8 | 2 7 | eqtr4i |