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Theorem muladd11 7907
Description: A simple product of sums expansion. (Contributed by NM, 21-Feb-2005.)
Assertion
Ref Expression
muladd11  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( ( 1  +  A )  x.  (
1  +  B ) )  =  ( ( 1  +  A )  +  ( B  +  ( A  x.  B
) ) ) )

Proof of Theorem muladd11
StepHypRef Expression
1 ax-1cn 7725 . . . 4  |-  1  e.  CC
2 addcl 7757 . . . 4  |-  ( ( 1  e.  CC  /\  A  e.  CC )  ->  ( 1  +  A
)  e.  CC )
31, 2mpan 420 . . 3  |-  ( A  e.  CC  ->  (
1  +  A )  e.  CC )
4 adddi 7764 . . . 4  |-  ( ( ( 1  +  A
)  e.  CC  /\  1  e.  CC  /\  B  e.  CC )  ->  (
( 1  +  A
)  x.  ( 1  +  B ) )  =  ( ( ( 1  +  A )  x.  1 )  +  ( ( 1  +  A )  x.  B
) ) )
51, 4mp3an2 1303 . . 3  |-  ( ( ( 1  +  A
)  e.  CC  /\  B  e.  CC )  ->  ( ( 1  +  A )  x.  (
1  +  B ) )  =  ( ( ( 1  +  A
)  x.  1 )  +  ( ( 1  +  A )  x.  B ) ) )
63, 5sylan 281 . 2  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( ( 1  +  A )  x.  (
1  +  B ) )  =  ( ( ( 1  +  A
)  x.  1 )  +  ( ( 1  +  A )  x.  B ) ) )
73mulid1d 7795 . . . 4  |-  ( A  e.  CC  ->  (
( 1  +  A
)  x.  1 )  =  ( 1  +  A ) )
87adantr 274 . . 3  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( ( 1  +  A )  x.  1 )  =  ( 1  +  A ) )
9 adddir 7769 . . . . 5  |-  ( ( 1  e.  CC  /\  A  e.  CC  /\  B  e.  CC )  ->  (
( 1  +  A
)  x.  B )  =  ( ( 1  x.  B )  +  ( A  x.  B
) ) )
101, 9mp3an1 1302 . . . 4  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( ( 1  +  A )  x.  B
)  =  ( ( 1  x.  B )  +  ( A  x.  B ) ) )
11 mulid2 7776 . . . . . 6  |-  ( B  e.  CC  ->  (
1  x.  B )  =  B )
1211adantl 275 . . . . 5  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( 1  x.  B
)  =  B )
1312oveq1d 5789 . . . 4  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( ( 1  x.  B )  +  ( A  x.  B ) )  =  ( B  +  ( A  x.  B ) ) )
1410, 13eqtrd 2172 . . 3  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( ( 1  +  A )  x.  B
)  =  ( B  +  ( A  x.  B ) ) )
158, 14oveq12d 5792 . 2  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( ( ( 1  +  A )  x.  1 )  +  ( ( 1  +  A
)  x.  B ) )  =  ( ( 1  +  A )  +  ( B  +  ( A  x.  B
) ) ) )
166, 15eqtrd 2172 1  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( ( 1  +  A )  x.  (
1  +  B ) )  =  ( ( 1  +  A )  +  ( B  +  ( A  x.  B
) ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    = wceq 1331    e. wcel 1480  (class class class)co 5774   CCcc 7630   1c1 7633    + caddc 7635    x. cmul 7637
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 2121  ax-resscn 7724  ax-1cn 7725  ax-icn 7727  ax-addcl 7728  ax-mulcl 7730  ax-mulcom 7733  ax-mulass 7735  ax-distr 7736  ax-1rid 7739  ax-cnre 7743
This theorem depends on definitions:  df-bi 116  df-3an 964  df-tru 1334  df-nf 1437  df-sb 1736  df-clab 2126  df-cleq 2132  df-clel 2135  df-nfc 2270  df-ral 2421  df-rex 2422  df-v 2688  df-un 3075  df-in 3077  df-ss 3084  df-sn 3533  df-pr 3534  df-op 3536  df-uni 3737  df-br 3930  df-iota 5088  df-fv 5131  df-ov 5777
This theorem is referenced by:  muladd11r  7930  bernneq  10424
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