Description: /\ -manipulation. (Contributed by Jonathan Ben-Naim, 3-Jun-2011) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | bnj643 | |- ( ( ph /\ ps /\ ch /\ th ) -> ps ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bnj291 | |- ( ( ph /\ ps /\ ch /\ th ) <-> ( ( ph /\ ch /\ th ) /\ ps ) ) |
|
2 | 1 | simprbi | |- ( ( ph /\ ps /\ ch /\ th ) -> ps ) |