Description: Membership in the intersection of a class abstraction. (Contributed by NM, 17-Oct-1999)
Ref | Expression | ||
---|---|---|---|
Hypothesis | inteqab.1 | |
|
Assertion | elintrab | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | inteqab.1 | |
|
2 | 1 | elintab | |
3 | impexp | |
|
4 | 3 | albii | |
5 | 2 4 | bitri | |
6 | df-rab | |
|
7 | 6 | inteqi | |
8 | 7 | eleq2i | |
9 | df-ral | |
|
10 | 5 8 9 | 3bitr4i | |