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Metamath Proof Explorer
Description: Version of 19.8a with a disjoint variable condition, requiring fewer
axioms. Converse of ax5e . (Contributed by BJ, 12-Mar-2020)
|
|
Ref |
Expression |
|
Assertion |
19.8v |
|- ( ph -> E. x ph ) |
Proof
| Step |
Hyp |
Ref |
Expression |
| 1 |
|
ax-5 |
|- ( ph -> A. x ph ) |
| 2 |
1
|
19.8w |
|- ( ph -> E. x ph ) |