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Mirrors > Home > NFE Home > Th. List > anbi12d | Unicode version |
Description: Deduction joining two equivalences to form equivalence of conjunctions. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
bi12d.1 | |
bi12d.2 |
Ref | Expression |
---|---|
anbi12d |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bi12d.1 | . . 3 | |
2 | 1 | anbi1d 685 | . 2 |
3 | bi12d.2 | . . 3 | |
4 | 3 | anbi2d 684 | . 2 |
5 | 2, 4 | bitrd 244 | 1 |
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