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| Mirrors > Home > ILE Home > Th. List > syl5 | GIF version | ||
| Description: A syllogism rule of inference. The second premise is used to replace the second antecedent of the first premise. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 25-May-2013.) | 
| Ref | Expression | 
|---|---|
| syl5.1 | ⊢ (𝜑 → 𝜓) | 
| syl5.2 | ⊢ (𝜒 → (𝜓 → 𝜃)) | 
| Ref | Expression | 
|---|---|
| syl5 | ⊢ (𝜒 → (𝜑 → 𝜃)) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | syl5.1 | . . 3 ⊢ (𝜑 → 𝜓) | |
| 2 | syl5.2 | . . 3 ⊢ (𝜒 → (𝜓 → 𝜃)) | |
| 3 | 1, 2 | syl5com 29 | . 2 ⊢ (𝜑 → (𝜒 → 𝜃)) | 
| 4 | 3 | com12 30 | 1 ⊢ (𝜒 → (𝜑 → 𝜃)) | 
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