Theorem muladdd 7520

Description: Product of two sums. (Contributed by Mario Carneiro, 27-May-2016.)

Hypotheses

Ref	Expression
mulm1d.1	|- ( ph -> A e. CC )
mulnegd.2	|- ( ph -> B e. CC )
subdid.3	|- ( ph -> C e. CC )
muladdd.4	|- ( ph -> D e. CC )

Assertion

Ref	Expression
muladdd	|- ( ph -> ( ( A + B ) x. ( C + D ) ) = ( ( ( A x. C ) + ( D x. B ) ) + ( ( A x. D ) + ( C x. B ) ) ) )

Proof of Theorem muladdd

Step	Hyp	Ref	Expression
1		mulm1d.1	. 2 |- ( ph -> A e. CC )
2		mulnegd.2	. 2 |- ( ph -> B e. CC )
3		subdid.3	. 2 |- ( ph -> C e. CC )
4		muladdd.4	. 2 |- ( ph -> D e. CC )
5		muladd 7488	. 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 ) ) ) )
6	1, 2, 3, 4, 5	syl22anc 1170	1 |- ( ph -> ( ( A + B ) x. ( C + D ) ) = ( ( ( A x. C ) + ( D x. B ) ) + ( ( A x. D ) + ( C x. B ) ) ) )

Syntax hints:   -> wi 4   = wceq 1284   e. wcel 1433  (class class class)co 5532   CCcc 6979   + caddc 6984   x. cmul 6986

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 662  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-10 1436  ax-11 1437  ax-i12 1438  ax-bndl 1439  ax-4 1440  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063  ax-addcl 7072  ax-mulcl 7074  ax-addcom 7076  ax-mulcom 7077  ax-addass 7078  ax-distr 7080

This theorem depends on definitions:  df-bi 115  df-3an 921  df-tru 1287  df-nf 1390  df-sb 1686  df-clab 2068  df-cleq 2074  df-clel 2077  df-nfc 2208  df-rex 2354  df-v 2603  df-un 2977  df-sn 3404  df-pr 3405  df-op 3407  df-uni 3602  df-br 3786  df-iota 4887  df-fv 4930  df-ov 5535

This theorem is referenced by:  mulreim  7704