Description: Simplification of conjunction. (Contributed by NM, 9-Mar-2012)
Ref | Expression | ||
---|---|---|---|
Assertion | simp2ll | |- ( ( th /\ ( ( ph /\ ps ) /\ ch ) /\ ta ) -> ph ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpll | |- ( ( ( ph /\ ps ) /\ ch ) -> ph ) |
|
2 | 1 | 3ad2ant2 | |- ( ( th /\ ( ( ph /\ ps ) /\ ch ) /\ ta ) -> ph ) |