Description: Membership in an open interval of extended reals. (Contributed by NM, 17-Aug-2008)
Ref | Expression | ||
---|---|---|---|
Assertion | elioo5 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elioo1 | |
|
2 | 1 | 3adant3 | |
3 | 3anass | |
|
4 | 3 | baibr | |
5 | 4 | 3ad2ant3 | |
6 | 2 5 | bitr4d | |