Description: The abstraction of a wff with existential uniqueness exists. (Contributed by NM, 25-Nov-1994)
Ref | Expression | ||
---|---|---|---|
Assertion | euabex | |- ( E! x ph -> { x | ph } e. _V ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eumo | |- ( E! x ph -> E* x ph ) |
|
2 | moabex | |- ( E* x ph -> { x | ph } e. _V ) |
|
3 | 1 2 | syl | |- ( E! x ph -> { x | ph } e. _V ) |