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Mirrors > Home > MPE Home > Th. List > sylibrd | Structured version Visualization version GIF version |
Description: A syllogism deduction. (Contributed by NM, 3-Aug-1994.) |
Ref | Expression |
---|---|
sylibrd.1 | ⊢ (𝜑 → (𝜓 → 𝜒)) |
sylibrd.2 | ⊢ (𝜑 → (𝜃 ↔ 𝜒)) |
Ref | Expression |
---|---|
sylibrd | ⊢ (𝜑 → (𝜓 → 𝜃)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sylibrd.1 | . 2 ⊢ (𝜑 → (𝜓 → 𝜒)) | |
2 | sylibrd.2 | . . 3 ⊢ (𝜑 → (𝜃 ↔ 𝜒)) | |
3 | 2 | biimprd 247 | . 2 ⊢ (𝜑 → (𝜒 → 𝜃)) |
4 | 1, 3 | syld 47 | 1 ⊢ (𝜑 → (𝜓 → 𝜃)) |
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