Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypothesis | bnj1266.1 | |- ( ch -> E. x ( ph /\ ps ) ) |
|
Assertion | bnj1266 | |- ( ch -> E. x ps ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bnj1266.1 | |- ( ch -> E. x ( ph /\ ps ) ) |
|
2 | simpr | |- ( ( ph /\ ps ) -> ps ) |
|
3 | 1 2 | bnj593 | |- ( ch -> E. x ps ) |