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Mirrors > Home > ILE Home > Th. List > biimpi | GIF version |
Description: Infer an implication from a logical equivalence. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
biimpi.1 | ⊢ (𝜑 ↔ 𝜓) |
Ref | Expression |
---|---|
biimpi | ⊢ (𝜑 → 𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | biimpi.1 | . 2 ⊢ (𝜑 ↔ 𝜓) | |
2 | biimp 117 | . 2 ⊢ ((𝜑 ↔ 𝜓) → (𝜑 → 𝜓)) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ (𝜑 → 𝜓) |
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