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| Mirrors > Home > MPE Home > Th. List > pm2.61ian | Structured version Visualization version GIF version | ||
| Description: Elimination of an antecedent. (Contributed by NM, 1-Jan-2005.) | 
| Ref | Expression | 
|---|---|
| pm2.61ian.1 | ⊢ ((𝜑 ∧ 𝜓) → 𝜒) | 
| pm2.61ian.2 | ⊢ ((¬ 𝜑 ∧ 𝜓) → 𝜒) | 
| Ref | Expression | 
|---|---|
| pm2.61ian | ⊢ (𝜓 → 𝜒) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | pm2.61ian.1 | . . 3 ⊢ ((𝜑 ∧ 𝜓) → 𝜒) | |
| 2 | 1 | ex 412 | . 2 ⊢ (𝜑 → (𝜓 → 𝜒)) | 
| 3 | pm2.61ian.2 | . . 3 ⊢ ((¬ 𝜑 ∧ 𝜓) → 𝜒) | |
| 4 | 3 | ex 412 | . 2 ⊢ (¬ 𝜑 → (𝜓 → 𝜒)) | 
| 5 | 2, 4 | pm2.61i 182 | 1 ⊢ (𝜓 → 𝜒) | 
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