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Related theorems GIF version |
| Description: Exportation inference. (This theorem used to be labeled "exp" but was changed to "ex" so as not to conflict with the math token "exp", per the June 2006 Metamath spec change.) (The proof was shortened by Eric Schmidt, 22-Dec-2006.) |
| Ref | Expression |
|---|---|
| exp.1 | ⊢ ((φ ⋀ ψ) → χ) |
| Ref | Expression |
|---|---|
| ex | ⊢ (φ → (ψ → χ)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | exp.1 | . 2 ⊢ ((φ ⋀ ψ) → χ) | |
| 2 | impexp 345 | . 2 ⊢ (((φ ⋀ ψ) → χ) ↔ (φ → (ψ → χ))) | |
| 3 | 1, 2 | mpbi 187 | 1 ⊢ (φ → (ψ → χ)) |