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Theorem add4d 7895
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 7887 . 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 1200 1  |-  ( ph  ->  ( ( A  +  B )  +  ( C  +  D ) )  =  ( ( A  +  C )  +  ( B  +  D ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1314    e. wcel 1463  (class class class)co 5740   CCcc 7582    + caddc 7587
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 681  ax-5 1406  ax-7 1407  ax-gen 1408  ax-ie1 1452  ax-ie2 1453  ax-8 1465  ax-10 1466  ax-11 1467  ax-i12 1468  ax-bndl 1469  ax-4 1470  ax-17 1489  ax-i9 1493  ax-ial 1497  ax-i5r 1498  ax-ext 2097  ax-addcl 7680  ax-addcom 7684  ax-addass 7686
This theorem depends on definitions:  df-bi 116  df-3an 947  df-tru 1317  df-nf 1420  df-sb 1719  df-clab 2102  df-cleq 2108  df-clel 2111  df-nfc 2245  df-rex 2397  df-v 2660  df-un 3043  df-sn 3501  df-pr 3502  df-op 3504  df-uni 3705  df-br 3898  df-iota 5056  df-fv 5099  df-ov 5743
This theorem is referenced by:  apadd1  8333  binom3  10360  readd  10592  imadd  10600  max0addsup  10942  bdtri  10962  efi4p  11334
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