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Mirrors > Home > MPE Home > Th. List > imbi12d | Unicode version |
Description: Deduction joining two equivalences to form equivalence of implications. (Contributed by NM, 16-May-1993.) |
Ref | Expression |
---|---|
imbi12d.1 | |
imbi12d.2 |
Ref | Expression |
---|---|
imbi12d |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | imbi12d.1 | . . 3 | |
2 | 1 | imbi1d 317 | . 2 |
3 | imbi12d.2 | . . 3 | |
4 | 3 | imbi2d 316 | . 2 |
5 | 2, 4 | bitrd 253 | 1 |
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