| Metamath Proof Explorer |
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Related theorems GIF version |
| Description: Infer an implication from a logical equivalence. |
| Ref | Expression |
|---|---|
| biimp.1 | ⊢ (φ ↔ ψ) |
| Ref | Expression |
|---|---|
| biimpi | ⊢ (φ → ψ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | biimp.1 | . 2 ⊢ (φ ↔ ψ) | |
| 2 | bi1 146 | . 2 ⊢ ((φ ↔ ψ) → (φ → ψ)) | |
| 3 | 1, 2 | ax-mp 7 | 1 ⊢ (φ → ψ) |