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Related theorems GIF version |
| Description: A syllogism inference. |
| Ref | Expression |
|---|---|
| sylan.1 | ⊢ ((φ ⋀ ψ) → χ) |
| sylan2.2 | ⊢ (θ → ψ) |
| Ref | Expression |
|---|---|
| sylan2 | ⊢ ((φ ⋀ θ) → χ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sylan.1 | . . . 4 ⊢ ((φ ⋀ ψ) → χ) | |
| 2 | 1 | ex 373 | . . 3 ⊢ (φ → (ψ → χ)) |
| 3 | sylan2.2 | . . 3 ⊢ (θ → ψ) | |
| 4 | 2, 3 | syl5 21 | . 2 ⊢ (φ → (θ → χ)) |
| 5 | 4 | imp 350 | 1 ⊢ ((φ ⋀ θ) → χ) |