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Mirrors > Home > MPE Home > Th. List > impbida | Unicode version |
Description: Deduce an equivalence from two implications. (Contributed by NM, 17-Feb-2007.) |
Ref | Expression |
---|---|
impbida.1 | |
impbida.2 |
Ref | Expression |
---|---|
impbida |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | impbida.1 | . . 3 | |
2 | 1 | ex 434 | . 2 |
3 | impbida.2 | . . 3 | |
4 | 3 | ex 434 | . 2 |
5 | 2, 4 | impbid 191 | 1 |
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