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Related theorems GIF version |
| Description: Importation inference with commuted antecedents. |
| Ref | Expression |
|---|---|
| imp.1 | ⊢ (φ → (ψ → χ)) |
| Ref | Expression |
|---|---|
| impcom | ⊢ ((ψ ⋀ φ) → χ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | imp.1 | . . 3 ⊢ (φ → (ψ → χ)) | |
| 2 | 1 | com12 11 | . 2 ⊢ (ψ → (φ → χ)) |
| 3 | 2 | imp 348 | 1 ⊢ ((ψ ⋀ φ) → χ) |