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| Mirrors > Home > ILE Home > Th. List > mpbir | GIF version | ||
| Description: An inference from a biconditional, related to modus ponens. (Contributed by NM, 5-Aug-1993.) | 
| Ref | Expression | 
|---|---|
| mpbir.min | ⊢ 𝜓 | 
| mpbir.maj | ⊢ (𝜑 ↔ 𝜓) | 
| Ref | Expression | 
|---|---|
| mpbir | ⊢ 𝜑 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | mpbir.min | . 2 ⊢ 𝜓 | |
| 2 | mpbir.maj | . . 3 ⊢ (𝜑 ↔ 𝜓) | |
| 3 | 2 | biimpri 133 | . 2 ⊢ (𝜓 → 𝜑) | 
| 4 | 1, 3 | ax-mp 5 | 1 ⊢ 𝜑 | 
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