Description: Inference introducing an antecedent. Inference associated with ax-1 . Its associated inference is a1ii . See conventions for a definition of "associated inference". (Contributed by NM, 29-Dec-1992)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | a1i.1 | |- ph |
|
| Assertion | a1i | |- ( ps -> ph ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | a1i.1 | |- ph |
|
| 2 | ax-1 | |- ( ph -> ( ps -> ph ) ) |
|
| 3 | 1 2 | ax-mp | |- ( ps -> ph ) |