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Related theorems GIF version |
| Description: Importation inference. (The proof was shortened by Eric Schmidt, 22-Dec-2006.) |
| Ref | Expression |
|---|---|
| imp.1 | ⊢ (φ → (ψ → χ)) |
| Ref | Expression |
|---|---|
| imp | ⊢ ((φ ⋀ ψ) → χ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | imp.1 | . 2 ⊢ (φ → (ψ → χ)) | |
| 2 | impexp 347 | . 2 ⊢ (((φ ⋀ ψ) → χ) ↔ (φ → (ψ → χ))) | |
| 3 | 1, 2 | mpbir 190 | 1 ⊢ ((φ ⋀ ψ) → χ) |