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Mirrors > Home > ILE Home > Th. List > sylancr | GIF version |
Description: Syllogism inference combined with modus ponens. (Contributed by Jeff Madsen, 2-Sep-2009.) |
Ref | Expression |
---|---|
sylancr.1 | ⊢ 𝜓 |
sylancr.2 | ⊢ (𝜑 → 𝜒) |
sylancr.3 | ⊢ ((𝜓 ∧ 𝜒) → 𝜃) |
Ref | Expression |
---|---|
sylancr | ⊢ (𝜑 → 𝜃) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sylancr.1 | . . 3 ⊢ 𝜓 | |
2 | 1 | a1i 9 | . 2 ⊢ (𝜑 → 𝜓) |
3 | sylancr.2 | . 2 ⊢ (𝜑 → 𝜒) | |
4 | sylancr.3 | . 2 ⊢ ((𝜓 ∧ 𝜒) → 𝜃) | |
5 | 2, 3, 4 | syl2anc 409 | 1 ⊢ (𝜑 → 𝜃) |
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