Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > sylbir | Structured version Visualization version GIF version |
Description: A mixed syllogism inference from a biconditional and an implication. (Contributed by NM, 3-Jan-1993.) |
Ref | Expression |
---|---|
sylbir.1 | ⊢ (𝜓 ↔ 𝜑) |
sylbir.2 | ⊢ (𝜓 → 𝜒) |
Ref | Expression |
---|---|
sylbir | ⊢ (𝜑 → 𝜒) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sylbir.1 | . . 3 ⊢ (𝜓 ↔ 𝜑) | |
2 | 1 | biimpri 231 | . 2 ⊢ (𝜑 → 𝜓) |
3 | sylbir.2 | . 2 ⊢ (𝜓 → 𝜒) | |
4 | 2, 3 | syl 17 | 1 ⊢ (𝜑 → 𝜒) |
Copyright terms: Public domain | W3C validator |