Description: Membership in class intersection. (Contributed by NM, 14-Oct-1999)
Ref | Expression | ||
---|---|---|---|
Hypothesis | elint2.1 | |
|
Assertion | elint2 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elint2.1 | |
|
2 | 1 | elint | |
3 | df-ral | |
|
4 | 2 3 | bitr4i | |