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| Mirrors > Home > MPE Home > Th. List > syld | Structured version Visualization version GIF version | ||
| Description: Syllogism deduction. Deduction associated with syl 17. See conventions 30366 for the meaning of "associated deduction" or "deduction form". (Contributed by NM, 5-Aug-1993.) (Proof shortened by Mel L. O'Cat, 19-Feb-2008.) (Proof shortened by Wolf Lammen, 3-Aug-2012.) |
| Ref | Expression |
|---|---|
| syld.1 | ⊢ (𝜑 → (𝜓 → 𝜒)) |
| syld.2 | ⊢ (𝜑 → (𝜒 → 𝜃)) |
| Ref | Expression |
|---|---|
| syld | ⊢ (𝜑 → (𝜓 → 𝜃)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | syld.1 | . 2 ⊢ (𝜑 → (𝜓 → 𝜒)) | |
| 2 | syld.2 | . . 3 ⊢ (𝜑 → (𝜒 → 𝜃)) | |
| 3 | 2 | a1d 25 | . 2 ⊢ (𝜑 → (𝜓 → (𝜒 → 𝜃))) |
| 4 | 1, 3 | mpdd 43 | 1 ⊢ (𝜑 → (𝜓 → 𝜃)) |
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