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Theorem add4d 7396
Description: Rearrangement of 4 terms in a sum. (Contributed by Mario Carneiro, 27-May-2016.)
Hypotheses
Ref Expression
addd.1  |-  ( ph  ->  A  e.  CC )
addd.2  |-  ( ph  ->  B  e.  CC )
addd.3  |-  ( ph  ->  C  e.  CC )
add4d.4  |-  ( ph  ->  D  e.  CC )
Assertion
Ref Expression
add4d  |-  ( ph  ->  ( ( A  +  B )  +  ( C  +  D ) )  =  ( ( A  +  C )  +  ( B  +  D ) ) )

Proof of Theorem add4d
StepHypRef Expression
1 addd.1 . 2  |-  ( ph  ->  A  e.  CC )
2 addd.2 . 2  |-  ( ph  ->  B  e.  CC )
3 addd.3 . 2  |-  ( ph  ->  C  e.  CC )
4 add4d.4 . 2  |-  ( ph  ->  D  e.  CC )
5 add4 7388 . 2  |-  ( ( ( A  e.  CC  /\  B  e.  CC )  /\  ( C  e.  CC  /\  D  e.  CC ) )  -> 
( ( A  +  B )  +  ( C  +  D ) )  =  ( ( A  +  C )  +  ( B  +  D ) ) )
61, 2, 3, 4, 5syl22anc 1171 1  |-  ( ph  ->  ( ( A  +  B )  +  ( C  +  D ) )  =  ( ( A  +  C )  +  ( B  +  D ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1285    e. wcel 1434  (class class class)co 5563   CCcc 7093    + caddc 7098
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 663  ax-5 1377  ax-7 1378  ax-gen 1379  ax-ie1 1423  ax-ie2 1424  ax-8 1436  ax-10 1437  ax-11 1438  ax-i12 1439  ax-bndl 1440  ax-4 1441  ax-17 1460  ax-i9 1464  ax-ial 1468  ax-i5r 1469  ax-ext 2065  ax-addcl 7186  ax-addcom 7190  ax-addass 7192
This theorem depends on definitions:  df-bi 115  df-3an 922  df-tru 1288  df-nf 1391  df-sb 1688  df-clab 2070  df-cleq 2076  df-clel 2079  df-nfc 2212  df-rex 2359  df-v 2612  df-un 2986  df-sn 3422  df-pr 3423  df-op 3425  df-uni 3622  df-br 3806  df-iota 4917  df-fv 4960  df-ov 5566
This theorem is referenced by:  apadd1  7827  binom3  9739  readd  9957  imadd  9965  max0addsup  10306
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