Description: Obsolete version of ral0 as of 2-Sep-2024. (Contributed by NM, 20-Oct-2005) (Proof modification is discouraged.) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | ral0OLD | |- A. x e. (/) ph |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | noel | |- -. x e. (/) |
|
| 2 | 1 | pm2.21i | |- ( x e. (/) -> ph ) |
| 3 | 2 | rgen | |- A. x e. (/) ph |