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Related theorems GIF version |
| Description: Deduce an implication from a logical equivalence. |
| 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 | bi1 146 | . 2 ⊢ ((ψ ↔ χ) → (ψ → χ)) | |
| 3 | 1, 2 | syl 10 | 1 ⊢ (φ → (ψ → χ)) |