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Description: Inference exchanging the last antecedent with the second one. (Contributed by Thierry Arnoux, 3-Jun-2025)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | an82ds.1 | ||
| Assertion | an82ds |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | an82ds.1 | ||
| 2 | an32 | ||
| 3 | 2 | anbi1i | |
| 4 | 3 | anbi1i | |
| 5 | 4 | anbi1i | |
| 6 | 5 | anbi1i | |
| 7 | 1 | an72ds | |
| 8 | 6 7 | sylanbr | |
| 9 | 8 | an72ds |