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Mirrors > Home > MPE Home > Th. List > impbid1 | Structured version Visualization version Unicode version |
Description: Infer an equivalence from two implications. (Contributed by NM, 6-Mar-2007.) |
Ref | Expression |
---|---|
impbid1.1 | |
impbid1.2 |
Ref | Expression |
---|---|
impbid1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | impbid1.1 | . 2 | |
2 | impbid1.2 | . . 3 | |
3 | 2 | a1i 11 | . 2 |
4 | 1, 3 | impbid 202 | 1 |
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