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Mirrors > Home > MPE Home > Th. List > 3bitr4g | Structured version Visualization version GIF version |
Description: More general version of 3bitr4i 303. Useful for converting definitions in a formula. (Contributed by NM, 11-May-1993.) |
Ref | Expression |
---|---|
3bitr4g.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
3bitr4g.2 | ⊢ (𝜃 ↔ 𝜓) |
3bitr4g.3 | ⊢ (𝜏 ↔ 𝜒) |
Ref | Expression |
---|---|
3bitr4g | ⊢ (𝜑 → (𝜃 ↔ 𝜏)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3bitr4g.2 | . . 3 ⊢ (𝜃 ↔ 𝜓) | |
2 | 3bitr4g.1 | . . 3 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
3 | 1, 2 | bitrid 282 | . 2 ⊢ (𝜑 → (𝜃 ↔ 𝜒)) |
4 | 3bitr4g.3 | . 2 ⊢ (𝜏 ↔ 𝜒) | |
5 | 3, 4 | bitr4di 289 | 1 ⊢ (𝜑 → (𝜃 ↔ 𝜏)) |
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