Theorem an32 562

Description: A rearrangement of conjuncts. (Contributed by NM, 12-Mar-1995.) (Proof shortened by Wolf Lammen, 25-Dec-2012.)

Assertion

Ref	Expression
an32	|- ( ( ( ph /\ ps ) /\ ch ) <-> ( ( ph /\ ch ) /\ ps ) )

Proof of Theorem an32

Step	Hyp	Ref	Expression
1		anass 401	. 2 |- ( ( ( ph /\ ps ) /\ ch ) <-> ( ph /\ ( ps /\ ch ) ) )
2		an12 561	. 2 |- ( ( ph /\ ( ps /\ ch ) ) <-> ( ps /\ ( ph /\ ch ) ) )
3		ancom 266	. 2 |- ( ( ps /\ ( ph /\ ch ) ) <-> ( ( ph /\ ch ) /\ ps ) )
4	1, 2, 3	3bitri 206	1 |- ( ( ( ph /\ ps ) /\ ch ) <-> ( ( ph /\ ch ) /\ ps ) )

Syntax hints:   /\ wa 104   <-> wb 105

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108

This theorem depends on definitions:  df-bi 117

This theorem is referenced by:  an32s  568  3anan32  991  indifdir  3415  inrab2  3432  reupick  3443  unidif0  4196  resco  5170  f11o  5533  respreima  5686  dff1o6  5819  dfoprab2  5965  xpassen  6884  enq0enq  7491  elioomnf  10034  modfsummod  11601  pcqcl  12444  tx1cn  14437  isms2  14622  elcncf1di  14734