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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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