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Mirrors > Home > ILE Home > Th. List > bitrd | GIF version |
Description: Deduction form of bitri 183. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 14-Apr-2013.) |
Ref | Expression |
---|---|
bitrd.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
bitrd.2 | ⊢ (𝜑 → (𝜒 ↔ 𝜃)) |
Ref | Expression |
---|---|
bitrd | ⊢ (𝜑 → (𝜓 ↔ 𝜃)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bitrd.1 | . . . 4 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
2 | 1 | pm5.74i 179 | . . 3 ⊢ ((𝜑 → 𝜓) ↔ (𝜑 → 𝜒)) |
3 | bitrd.2 | . . . 4 ⊢ (𝜑 → (𝜒 ↔ 𝜃)) | |
4 | 3 | pm5.74i 179 | . . 3 ⊢ ((𝜑 → 𝜒) ↔ (𝜑 → 𝜃)) |
5 | 2, 4 | bitri 183 | . 2 ⊢ ((𝜑 → 𝜓) ↔ (𝜑 → 𝜃)) |
6 | 5 | pm5.74ri 180 | 1 ⊢ (𝜑 → (𝜓 ↔ 𝜃)) |
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