Description: Obsolete version of rmobidv as of 23-Nov-2024. (Contributed by NM, 16-Jun-2017) (Proof modification is discouraged.) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | rmobidva.1 | |- ( ( ph /\ x e. A ) -> ( ps <-> ch ) ) |
|
| Assertion | rmobidvaOLD | |- ( ph -> ( E* x e. A ps <-> E* x e. A ch ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | rmobidva.1 | |- ( ( ph /\ x e. A ) -> ( ps <-> ch ) ) |
|
| 2 | nfv | |- F/ x ph |
|
| 3 | 2 1 | rmobida | |- ( ph -> ( E* x e. A ps <-> E* x e. A ch ) ) |