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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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