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Mirrors > Home > ILE Home > Th. List > bicomd | GIF version |
Description: Commute two sides of a biconditional in a deduction. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
bicomd.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
Ref | Expression |
---|---|
bicomd | ⊢ (𝜑 → (𝜒 ↔ 𝜓)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bicomd.1 | . 2 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
2 | bicom 140 | . 2 ⊢ ((𝜓 ↔ 𝜒) ↔ (𝜒 ↔ 𝜓)) | |
3 | 1, 2 | sylib 122 | 1 ⊢ (𝜑 → (𝜒 ↔ 𝜓)) |
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