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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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