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Mirrors > Home > MPE Home > Th. List > impbid | Unicode version |
Description: Deduce an equivalence from two implications. (Contributed by NM, 24-Jan-1993.) Revised to prove it from impbid21d 190. (Revised by Wolf Lammen, 3-Nov-2012.) |
Ref | Expression |
---|---|
impbid.1 | |
impbid.2 |
Ref | Expression |
---|---|
impbid |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | impbid.1 | . . 3 | |
2 | impbid.2 | . . 3 | |
3 | 1, 2 | impbid21d 190 | . 2 |
4 | 3 | pm2.43i 47 | 1 |
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