Description: /\ -manipulation. (Contributed by Jonathan Ben-Naim, 3-Jun-2011) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | bnj312 | |- ( ( ph /\ ps /\ ch /\ th ) <-> ( ps /\ ph /\ ch /\ th ) ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3ancoma | |- ( ( ph /\ ps /\ ch ) <-> ( ps /\ ph /\ ch ) ) |
|
2 | 1 | anbi1i | |- ( ( ( ph /\ ps /\ ch ) /\ th ) <-> ( ( ps /\ ph /\ ch ) /\ th ) ) |
3 | df-bnj17 | |- ( ( ph /\ ps /\ ch /\ th ) <-> ( ( ph /\ ps /\ ch ) /\ th ) ) |
|
4 | df-bnj17 | |- ( ( ps /\ ph /\ ch /\ th ) <-> ( ( ps /\ ph /\ ch ) /\ th ) ) |
|
5 | 2 3 4 | 3bitr4i | |- ( ( ph /\ ps /\ ch /\ th ) <-> ( ps /\ ph /\ ch /\ th ) ) |