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Mirrors > Home > ILE Home > Th. List > biimpri | GIF version |
Description: Infer a converse implication from a logical equivalence. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 16-Sep-2013.) |
Ref | Expression |
---|---|
biimpri.1 | ⊢ (𝜑 ↔ 𝜓) |
Ref | Expression |
---|---|
biimpri | ⊢ (𝜓 → 𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | biimpri.1 | . . 3 ⊢ (𝜑 ↔ 𝜓) | |
2 | 1 | bicomi 131 | . 2 ⊢ (𝜓 ↔ 𝜑) |
3 | 2 | biimpi 119 | 1 ⊢ (𝜓 → 𝜑) |
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