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Mirrors > Home > MPE Home > Th. List > bitr4di | Structured version Visualization version GIF version |
Description: A syllogism inference from two biconditionals. (Contributed by NM, 12-Mar-1993.) |
Ref | Expression |
---|---|
bitr4di.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
bitr4di.2 | ⊢ (𝜃 ↔ 𝜒) |
Ref | Expression |
---|---|
bitr4di | ⊢ (𝜑 → (𝜓 ↔ 𝜃)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bitr4di.1 | . 2 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
2 | bitr4di.2 | . . 3 ⊢ (𝜃 ↔ 𝜒) | |
3 | 2 | bicomi 223 | . 2 ⊢ (𝜒 ↔ 𝜃) |
4 | 1, 3 | bitrdi 287 | 1 ⊢ (𝜑 → (𝜓 ↔ 𝜃)) |
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