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| Mirrors > Home > ILE Home > Th. List > mp1i | GIF version | ||
| Description: Drop and replace an antecedent. (Contributed by Stefan O'Rear, 29-Jan-2015.) | 
| Ref | Expression | 
|---|---|
| mp1i.a | ⊢ 𝜑 | 
| mp1i.b | ⊢ (𝜑 → 𝜓) | 
| Ref | Expression | 
|---|---|
| mp1i | ⊢ (𝜒 → 𝜓) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | mp1i.a | . . 3 ⊢ 𝜑 | |
| 2 | mp1i.b | . . 3 ⊢ (𝜑 → 𝜓) | |
| 3 | 1, 2 | ax-mp 5 | . 2 ⊢ 𝜓 | 
| 4 | 3 | a1i 9 | 1 ⊢ (𝜒 → 𝜓) | 
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