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Mirrors > Home > MPE Home > Th. List > bitr3id | Structured version Visualization version GIF version |
Description: A syllogism inference from two biconditionals. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
bitr3id.1 | ⊢ (𝜓 ↔ 𝜑) |
bitr3id.2 | ⊢ (𝜒 → (𝜓 ↔ 𝜃)) |
Ref | Expression |
---|---|
bitr3id | ⊢ (𝜒 → (𝜑 ↔ 𝜃)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bitr3id.1 | . . 3 ⊢ (𝜓 ↔ 𝜑) | |
2 | 1 | bicomi 223 | . 2 ⊢ (𝜑 ↔ 𝜓) |
3 | bitr3id.2 | . 2 ⊢ (𝜒 → (𝜓 ↔ 𝜃)) | |
4 | 2, 3 | syl5bb 282 | 1 ⊢ (𝜒 → (𝜑 ↔ 𝜃)) |
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