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| Mirrors > Home > MPE Home > Th. List > mpd | Structured version Visualization version GIF version | ||
| Description: A modus ponens deduction. A translation of natural deduction rule → E (→ elimination), see natded 30349. Deduction form of ax-mp 5. Inference associated with a2i 14. Commuted form of mpcom 38. (Contributed by NM, 29-Dec-1992.) | 
| Ref | Expression | 
|---|---|
| mpd.1 | ⊢ (𝜑 → 𝜓) | 
| mpd.2 | ⊢ (𝜑 → (𝜓 → 𝜒)) | 
| Ref | Expression | 
|---|---|
| mpd | ⊢ (𝜑 → 𝜒) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | mpd.1 | . 2 ⊢ (𝜑 → 𝜓) | |
| 2 | mpd.2 | . . 3 ⊢ (𝜑 → (𝜓 → 𝜒)) | |
| 3 | 2 | a2i 14 | . 2 ⊢ ((𝜑 → 𝜓) → (𝜑 → 𝜒)) | 
| 4 | 1, 3 | ax-mp 5 | 1 ⊢ (𝜑 → 𝜒) | 
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