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Related theorems Unicode version |
| Description: Deduce an equivalence from two implications. |
| Ref | Expression |
|---|---|
| impbid.1 |
|
| impbid.2 |
|
| Ref | Expression |
|---|---|
| impbid |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dfbi2 572 |
. 2
| |
| 2 | impbid.1 |
. 2
| |
| 3 | impbid.2 |
. 2
| |
| 4 | 1, 2, 3 | sylanbrc 527 |
1
|