Description: Obsolete version of pm2.61i as of 19-Nov-2023. (Contributed by NM, 5-Apr-1994) (Proof shortened by Wolf Lammen, 12-Sep-2013) (Proof modification is discouraged.) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | pm2.61iOLD.1 | |- ( ph -> ps ) |
|
| pm2.61iOLD.2 | |- ( -. ph -> ps ) |
||
| Assertion | pm2.61iOLD | |- ps |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pm2.61iOLD.1 | |- ( ph -> ps ) |
|
| 2 | pm2.61iOLD.2 | |- ( -. ph -> ps ) |
|
| 3 | id | |- ( ph -> ph ) |
|
| 4 | 2 1 | ja | |- ( ( ph -> ph ) -> ps ) |
| 5 | 3 4 | ax-mp | |- ps |