| Metamath Proof Explorer |
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Related theorems GIF version |
| Description: A syllogism rule of inference. The second premise is used to replace the consequent of the first premise. |
| Ref | Expression |
|---|---|
| syl6.1 | ⊢ (φ → (ψ → χ)) |
| syl6.2 | ⊢ (χ → θ) |
| Ref | Expression |
|---|---|
| syl6 | ⊢ (φ → (ψ → θ)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | syl6.1 | . 2 ⊢ (φ → (ψ → χ)) | |
| 2 | syl6.2 | . . 3 ⊢ (χ → θ) | |
| 3 | 2 | imim2i 17 | . 2 ⊢ ((ψ → χ) → (ψ → θ)) |
| 4 | 1, 3 | syl 10 | 1 ⊢ (φ → (ψ → θ)) |