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Theorem add42i 7896
Description: Rearrangement of 4 terms in a sum. (Contributed by NM, 22-Aug-1999.)
Hypotheses
Ref Expression
add.1  |-  A  e.  CC
add.2  |-  B  e.  CC
add.3  |-  C  e.  CC
add4.4  |-  D  e.  CC
Assertion
Ref Expression
add42i  |-  ( ( A  +  B )  +  ( C  +  D ) )  =  ( ( A  +  C )  +  ( D  +  B ) )

Proof of Theorem add42i
StepHypRef Expression
1 add.1 . . 3  |-  A  e.  CC
2 add.2 . . 3  |-  B  e.  CC
3 add.3 . . 3  |-  C  e.  CC
4 add4.4 . . 3  |-  D  e.  CC
51, 2, 3, 4add4i 7895 . 2  |-  ( ( A  +  B )  +  ( C  +  D ) )  =  ( ( A  +  C )  +  ( B  +  D ) )
62, 4addcomi 7874 . . 3  |-  ( B  +  D )  =  ( D  +  B
)
76oveq2i 5753 . 2  |-  ( ( A  +  C )  +  ( B  +  D ) )  =  ( ( A  +  C )  +  ( D  +  B ) )
85, 7eqtri 2138 1  |-  ( ( A  +  B )  +  ( C  +  D ) )  =  ( ( A  +  C )  +  ( D  +  B ) )
Colors of variables: wff set class
Syntax hints:    = wceq 1316    e. wcel 1465  (class class class)co 5742   CCcc 7586    + caddc 7591
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 683  ax-5 1408  ax-7 1409  ax-gen 1410  ax-ie1 1454  ax-ie2 1455  ax-8 1467  ax-10 1468  ax-11 1469  ax-i12 1470  ax-bndl 1471  ax-4 1472  ax-17 1491  ax-i9 1495  ax-ial 1499  ax-i5r 1500  ax-ext 2099  ax-addcl 7684  ax-addcom 7688  ax-addass 7690
This theorem depends on definitions:  df-bi 116  df-3an 949  df-tru 1319  df-nf 1422  df-sb 1721  df-clab 2104  df-cleq 2110  df-clel 2113  df-nfc 2247  df-rex 2399  df-v 2662  df-un 3045  df-sn 3503  df-pr 3504  df-op 3506  df-uni 3707  df-br 3900  df-iota 5058  df-fv 5101  df-ov 5745
This theorem is referenced by: (None)
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