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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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