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Mirrors > Home > ILE Home > Th. List > biimpd | GIF version |
Description: Deduce an implication from a logical equivalence. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
biimpd.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
Ref | Expression |
---|---|
biimpd | ⊢ (𝜑 → (𝜓 → 𝜒)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | biimpd.1 | . 2 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
2 | biimp 117 | . 2 ⊢ ((𝜓 ↔ 𝜒) → (𝜓 → 𝜒)) | |
3 | 1, 2 | syl 14 | 1 ⊢ (𝜑 → (𝜓 → 𝜒)) |
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