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| Mirrors > Home > ILE Home > Th. List > anbi12d | Unicode version | ||
| Description: Deduction joining two equivalences to form equivalence of conjunctions. (Contributed by NM, 5-Aug-1993.) |
| Ref | Expression |
|---|---|
| anbi12d.1 |
|
| anbi12d.2 |
|
| Ref | Expression |
|---|---|
| anbi12d |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | anbi12d.1 |
. . 3
| |
| 2 | 1 | anbi1d 465 |
. 2
|
| 3 | anbi12d.2 |
. . 3
| |
| 4 | 3 | anbi2d 464 |
. 2
|
| 5 | 2, 4 | bitrd 188 |
1
|
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