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Related theorems Unicode version |
| Description: An inference from transitive law for logical equivalence. |
| Ref | Expression |
|---|---|
| bitr4i.1 |
|
| bitr4i.2 |
|
| Ref | Expression |
|---|---|
| bitr4i |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | bitr4i.1 |
. 2
| |
| 2 | bitr4i.2 |
. . 3
| |
| 3 | 2 | bicomi 189 |
. 2
|
| 4 | 1, 3 | bitri 190 |
1
|