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Mirrors > Home > MPE Home > Th. List > impbid | Structured version Visualization version Unicode version |
Description: Deduce an equivalence from two implications. Deduction associated with impbi 191 and impbii 192. (Contributed by NM, 24-Jan-1993.) Revised to prove it from impbid21d 194. (Revised by Wolf Lammen, 3-Nov-2012.) |
Ref | Expression |
---|---|
impbid.1 |
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impbid.2 |
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Ref | Expression |
---|---|
impbid |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | impbid.1 |
. . 3
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2 | impbid.2 |
. . 3
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3 | 1, 2 | impbid21d 194 |
. 2
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4 | 3 | pm2.43i 49 |
1
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