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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 |
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imbi12d.2 |
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Ref | Expression |
---|---|
imbi12d |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | imbi12d.1 |
. . 3
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2 | 1 | imbi1d 220 |
. 2
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3 | imbi12d.2 |
. . 3
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4 | 3 | imbi2d 219 |
. 2
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5 | 2, 4 | bitrd 177 |
1
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