Theorem 3anan32 896

Description: Convert triple conjunction to conjunction, then commute. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.)

Assertion

Ref	Expression
3anan32	|- ( ( ph /\ ps /\ ch ) <-> ( ( ph /\ ch ) /\ ps ) )

Proof of Theorem 3anan32

Step	Hyp	Ref	Expression
1		df-3an 887	. 2 |- ( ( ph /\ ps /\ ch ) <-> ( ( ph /\ ps ) /\ ch ) )
2		an32 496	. 2 |- ( ( ( ph /\ ps ) /\ ch ) <-> ( ( ph /\ ch ) /\ ps ) )
3	1, 2	bitri 173	1 |- ( ( ph /\ ps /\ ch ) <-> ( ( ph /\ ch ) /\ ps ) )

Syntax hints:   /\ wa 97   <-> wb 98   /\ w3a 885

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101

This theorem depends on definitions:  df-bi 110  df-3an 887

This theorem is referenced by:  anandi3r  899  dff1o3  5132