Description: Obsolete version of nf5di as of 23-Oct-2026. (Contributed by NM, 17-Aug-2018) (Proof shortened by Wolf Lammen, 10-Jul-2019) (Proof modification is discouraged.) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | nf5diOLD.1 | |- ( ph -> F/ x ph ) |
|
| Assertion | nf5diOLD | |- F/ x ph |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nf5diOLD.1 | |- ( ph -> F/ x ph ) |
|
| 2 | 1 | nf5rd | |- ( ph -> ( ph -> A. x ph ) ) |
| 3 | 2 | pm2.43i | |- ( ph -> A. x ph ) |
| 4 | 3 | nf5i | |- F/ x ph |