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| Mirrors > Home > ILE Home > Th. List > imbi12d | Unicode version | ||
| Description: Deduction joining two equivalences to form equivalence of implications. (Contributed by NM, 5-Aug-1993.) | 
| Ref | Expression | 
|---|---|
| imbi12d.1 | 
 | 
| imbi12d.2 | 
 | 
| Ref | Expression | 
|---|---|
| imbi12d | 
 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | imbi12d.1 | 
. . 3
 | |
| 2 | 1 | imbi1d 231 | 
. 2
 | 
| 3 | imbi12d.2 | 
. . 3
 | |
| 4 | 3 | imbi2d 230 | 
. 2
 | 
| 5 | 2, 4 | bitrd 188 | 
1
 | 
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