Description: Obsolete proof of vprc , obsolete as of 1-May-2026. (Contributed by NM, 23-Aug-1993) (Proof modification is discouraged.) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | vprcOLD | |- -. _V e. _V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | vnex | |- -. E. x x = _V |
|
| 2 | isset | |- ( _V e. _V <-> E. x x = _V ) |
|
| 3 | 1 2 | mtbir | |- -. _V e. _V |