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Mirrors > Home > ILE Home > Th. List > mpd | GIF version |
Description: A modus ponens deduction. (Contributed by NM, 5-Aug-1993.) |
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 11 | . 2 ⊢ ((φ → ψ) → (φ → χ)) |
4 | 1, 3 | ax-mp 7 | 1 ⊢ (φ → χ) |
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