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Related theorems GIF version |
| Description: A syllogism inference combined with contraction. |
| Ref | Expression |
|---|---|
| sylanc.1 | ⊢ ((φ ⋀ ψ) → χ) |
| sylanc.2 | ⊢ (θ → φ) |
| sylanc.3 | ⊢ (θ → ψ) |
| Ref | Expression |
|---|---|
| sylanc | ⊢ (θ → χ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sylanc.1 | . . 3 ⊢ ((φ ⋀ ψ) → χ) | |
| 2 | 1 | ex 373 | . 2 ⊢ (φ → (ψ → χ)) |
| 3 | sylanc.2 | . 2 ⊢ (θ → φ) | |
| 4 | sylanc.3 | . 2 ⊢ (θ → ψ) | |
| 5 | 2, 3, 4 | sylc 68 | 1 ⊢ (θ → χ) |