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Mirrors > Home > MPE Home > Th. List > imbi12d | Structured version Visualization version GIF version |
Description: Deduction joining two equivalences to form equivalence of implications. (Contributed by NM, 16-May-1993.) |
Ref | Expression |
---|---|
imbi12d.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
imbi12d.2 | ⊢ (𝜑 → (𝜃 ↔ 𝜏)) |
Ref | Expression |
---|---|
imbi12d | ⊢ (𝜑 → ((𝜓 → 𝜃) ↔ (𝜒 → 𝜏))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | imbi12d.1 | . . 3 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
2 | 1 | imbi1d 341 | . 2 ⊢ (𝜑 → ((𝜓 → 𝜃) ↔ (𝜒 → 𝜃))) |
3 | imbi12d.2 | . . 3 ⊢ (𝜑 → (𝜃 ↔ 𝜏)) | |
4 | 3 | imbi2d 340 | . 2 ⊢ (𝜑 → ((𝜒 → 𝜃) ↔ (𝜒 → 𝜏))) |
5 | 2, 4 | bitrd 278 | 1 ⊢ (𝜑 → ((𝜓 → 𝜃) ↔ (𝜒 → 𝜏))) |
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