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| Mirrors > Home > ILE Home > Th. List > orbi12d | Unicode version | ||
| Description: Deduction joining two equivalences to form equivalence of disjunctions. (Contributed by NM, 5-Aug-1993.) |
| Ref | Expression |
|---|---|
| orbi12d.1 |
|
| orbi12d.2 |
|
| Ref | Expression |
|---|---|
| orbi12d |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | orbi12d.1 |
. . 3
| |
| 2 | 1 | orbi1d 792 |
. 2
|
| 3 | orbi12d.2 |
. . 3
| |
| 4 | 3 | orbi2d 791 |
. 2
|
| 5 | 2, 4 | bitrd 188 |
1
|
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