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Related theorems Unicode version |
| Description: Inference rule for ortholattices. |
| Ref | Expression |
|---|---|
| r4.1 |
|
| Ref | Expression |
|---|---|
| ax-r4 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | wva |
. . 3
| |
| 2 | 1 | wn 4 |
. 2
|
| 3 | wvb |
. . 3
| |
| 4 | 3 | wn 4 |
. 2
|
| 5 | 2, 4 | wb 1 |
1
|