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| Mirrors > Home > ILE Home > Th. List > a1i | GIF version | ||
| Description: Inference derived from Axiom ax-1 6. See a1d 22 for an explanation of our informal use of the terms "inference" and "deduction". See also the comment in syld 45. (Contributed by NM, 5-Aug-1993.) |
| Ref | Expression |
|---|---|
| a1i.1 | ⊢ 𝜑 |
| Ref | Expression |
|---|---|
| a1i | ⊢ (𝜓 → 𝜑) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | a1i.1 | . 2 ⊢ 𝜑 | |
| 2 | ax-1 6 | . 2 ⊢ (𝜑 → (𝜓 → 𝜑)) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ (𝜓 → 𝜑) |
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