Description: Inference exchanging the last antecedent with the second one. (Contributed by Thierry Arnoux, 3-Jun-2025)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | an72ds.1 | ||
| Assertion | an72ds |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | an72ds.1 | ||
| 2 | an32 | ||
| 3 | 2 | anbi1i | |
| 4 | 3 | anbi1i | |
| 5 | 4 | anbi1i | |
| 6 | 1 | an62ds | |
| 7 | 5 6 | sylanbr | |
| 8 | 7 | an62ds |