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Theorem muladdi 8164
Description: Product of two sums. (Contributed by NM, 17-May-1999.)
Hypotheses
Ref Expression
mulm1.1  |-  A  e.  CC
mulneg.2  |-  B  e.  CC
subdi.3  |-  C  e.  CC
muladdi.4  |-  D  e.  CC
Assertion
Ref Expression
muladdi  |-  ( ( A  +  B )  x.  ( C  +  D ) )  =  ( ( ( A  x.  C )  +  ( D  x.  B
) )  +  ( ( A  x.  D
)  +  ( C  x.  B ) ) )

Proof of Theorem muladdi
StepHypRef Expression
1 mulm1.1 . 2  |-  A  e.  CC
2 mulneg.2 . 2  |-  B  e.  CC
3 subdi.3 . 2  |-  C  e.  CC
4 muladdi.4 . 2  |-  D  e.  CC
5 muladd 8139 . 2  |-  ( ( ( A  e.  CC  /\  B  e.  CC )  /\  ( C  e.  CC  /\  D  e.  CC ) )  -> 
( ( A  +  B )  x.  ( C  +  D )
)  =  ( ( ( A  x.  C
)  +  ( D  x.  B ) )  +  ( ( A  x.  D )  +  ( C  x.  B
) ) ) )
61, 2, 3, 4, 5mp4an 423 1  |-  ( ( A  +  B )  x.  ( C  +  D ) )  =  ( ( ( A  x.  C )  +  ( D  x.  B
) )  +  ( ( A  x.  D
)  +  ( C  x.  B ) ) )
Colors of variables: wff set class
Syntax hints:    = wceq 1331    e. wcel 1480  (class class class)co 5767   CCcc 7611    + caddc 7616    x. cmul 7618
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 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2119  ax-addcl 7709  ax-mulcl 7711  ax-addcom 7713  ax-mulcom 7714  ax-addass 7715  ax-distr 7717
This theorem depends on definitions:  df-bi 116  df-3an 964  df-tru 1334  df-nf 1437  df-sb 1736  df-clab 2124  df-cleq 2130  df-clel 2133  df-nfc 2268  df-rex 2420  df-v 2683  df-un 3070  df-sn 3528  df-pr 3529  df-op 3531  df-uni 3732  df-br 3925  df-iota 5083  df-fv 5126  df-ov 5770
This theorem is referenced by: (None)
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