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Mirrors > Home > ILE Home > Th. List > syl6 | GIF version |
Description: A syllogism rule of inference. The second premise is used to replace the consequent of the first premise. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 30-Jul-2012.) |
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 | a1i 9 | . 2 ⊢ (𝜓 → (𝜒 → 𝜃)) |
4 | 1, 3 | sylcom 28 | 1 ⊢ (𝜑 → (𝜓 → 𝜃)) |
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