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Theorem mul4d 9234
Description: Rearrangement of 4 factors. (Contributed by Mario Carneiro, 27-May-2016.)
Hypotheses
Ref Expression
muld.1  |-  ( ph  ->  A  e.  CC )
addcomd.2  |-  ( ph  ->  B  e.  CC )
addcand.3  |-  ( ph  ->  C  e.  CC )
mul4d.4  |-  ( ph  ->  D  e.  CC )
Assertion
Ref Expression
mul4d  |-  ( ph  ->  ( ( A  x.  B )  x.  ( C  x.  D )
)  =  ( ( A  x.  C )  x.  ( B  x.  D ) ) )

Proof of Theorem mul4d
StepHypRef Expression
1 muld.1 . 2  |-  ( ph  ->  A  e.  CC )
2 addcomd.2 . 2  |-  ( ph  ->  B  e.  CC )
3 addcand.3 . 2  |-  ( ph  ->  C  e.  CC )
4 mul4d.4 . 2  |-  ( ph  ->  D  e.  CC )
5 mul4 9191 . 2  |-  ( ( ( A  e.  CC  /\  B  e.  CC )  /\  ( C  e.  CC  /\  D  e.  CC ) )  -> 
( ( A  x.  B )  x.  ( C  x.  D )
)  =  ( ( A  x.  C )  x.  ( B  x.  D ) ) )
61, 2, 3, 4, 5syl22anc 1185 1  |-  ( ph  ->  ( ( A  x.  B )  x.  ( C  x.  D )
)  =  ( ( A  x.  C )  x.  ( B  x.  D ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1649    e. wcel 1721  (class class class)co 6040   CCcc 8944    x. cmul 8951
This theorem is referenced by:  remullem  11888  absmul  12054  cosadd  12721  tanadd  12723  eulerthlem2  13126  mul4sqlem  13276  odadd2  15419  itgmulc2  19678  plymullem1  20086  chordthmlem4  20629  quartlem1  20650  dchrmulcl  20986  bposlem9  21029  lgsdir  21067  lgsdi  21069  lgsquad2lem1  21095  chtppilimlem1  21120  rplogsumlem1  21131  dchrvmasumlem1  21142  dchrvmasum2lem  21143  chpdifbndlem1  21200  pntlemf  21252  circum  25064  binomrisefac  25309  brbtwn2  25748  colinearalglem4  25752  itgmulc2nc  26172  pellexlem6  26787  pell1234qrmulcl  26808  rmxyadd  26874  wallispi2lem2  27688  cevathlem1  27724
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1552  ax-5 1563  ax-17 1623  ax-9 1662  ax-8 1683  ax-6 1740  ax-7 1745  ax-11 1757  ax-12 1946  ax-ext 2385  ax-mulcl 9008  ax-mulcom 9010  ax-mulass 9012
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3an 938  df-tru 1325  df-ex 1548  df-nf 1551  df-sb 1656  df-clab 2391  df-cleq 2397  df-clel 2400  df-nfc 2529  df-rex 2672  df-rab 2675  df-v 2918  df-dif 3283  df-un 3285  df-in 3287  df-ss 3294  df-nul 3589  df-if 3700  df-sn 3780  df-pr 3781  df-op 3783  df-uni 3976  df-br 4173  df-iota 5377  df-fv 5421  df-ov 6043
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