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Mirrors > Home > ILE Home > Th. List > biimpa | GIF version |
Description: Inference from a logical equivalence. (Contributed by NM, 3-May-1994.) |
Ref | Expression |
---|---|
biimpa.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
Ref | Expression |
---|---|
biimpa | ⊢ ((𝜑 ∧ 𝜓) → 𝜒) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | biimpa.1 | . . 3 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
2 | 1 | biimpd 143 | . 2 ⊢ (𝜑 → (𝜓 → 𝜒)) |
3 | 2 | imp 123 | 1 ⊢ ((𝜑 ∧ 𝜓) → 𝜒) |
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