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| Mirrors > Home > ILE Home > Th. List > imbitrrdi | GIF version | ||
| Description: A mixed syllogism inference from a nested implication and a biconditional. Useful for substituting an embedded consequent with a definition. (Contributed by NM, 5-Aug-1993.) | 
| Ref | Expression | 
|---|---|
| imbitrrdi.1 | ⊢ (𝜑 → (𝜓 → 𝜒)) | 
| imbitrrdi.2 | ⊢ (𝜃 ↔ 𝜒) | 
| Ref | Expression | 
|---|---|
| imbitrrdi | ⊢ (𝜑 → (𝜓 → 𝜃)) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | imbitrrdi.1 | . 2 ⊢ (𝜑 → (𝜓 → 𝜒)) | |
| 2 | imbitrrdi.2 | . . 3 ⊢ (𝜃 ↔ 𝜒) | |
| 3 | 2 | biimpri 133 | . 2 ⊢ (𝜒 → 𝜃) | 
| 4 | 1, 3 | syl6 33 | 1 ⊢ (𝜑 → (𝜓 → 𝜃)) | 
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