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Mirrors > Home > ILE Home > Th. List > 3syl | GIF version |
Description: Inference chaining two syllogisms. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
3syl.1 | ⊢ (𝜑 → 𝜓) |
3syl.2 | ⊢ (𝜓 → 𝜒) |
3syl.3 | ⊢ (𝜒 → 𝜃) |
Ref | Expression |
---|---|
3syl | ⊢ (𝜑 → 𝜃) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3syl.1 | . . 3 ⊢ (𝜑 → 𝜓) | |
2 | 3syl.2 | . . 3 ⊢ (𝜓 → 𝜒) | |
3 | 1, 2 | syl 14 | . 2 ⊢ (𝜑 → 𝜒) |
4 | 3syl.3 | . 2 ⊢ (𝜒 → 𝜃) | |
5 | 3, 4 | syl 14 | 1 ⊢ (𝜑 → 𝜃) |
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