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Related theorems GIF version |
| Description: Inference rule for ortholattices. |
| Ref | Expression |
|---|---|
| r1.1 | a = b |
| Ref | Expression |
|---|---|
| ax-r1 | b = a |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | wvb | . 2 term b | |
| 2 | wva | . 2 term a | |
| 3 | 1, 2 | wb 1 | 1 wff b = a |