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| Description: Deduction form of bitr 173. |
| Ref | Expression |
|---|---|
| bitrd.1 |
|
| bitrd.2 |
|
| Ref | Expression |
|---|---|
| bitrd |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | bitrd.1 |
. . . 4
| |
| 2 | 1 | biimpd 153 |
. . 3
|
| 3 | bitrd.2 |
. . 3
| |
| 4 | 2, 3 | sylibd 202 |
. 2
|
| 5 | 3 | biimprd 154 |
. . 3
|
| 6 | 5, 1 | sylibrd 204 |
. 2
|
| 7 | 4, 6 | impbid 516 |
1
|