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Theorem mulsubfacd 8561
Description: Multiplication followed by the subtraction of a factor. (Contributed by Alexander van der Vekens, 28-Aug-2018.)
Hypotheses
Ref Expression
muls1d.1  |-  ( ph  ->  A  e.  CC )
muls1d.2  |-  ( ph  ->  B  e.  CC )
Assertion
Ref Expression
mulsubfacd  |-  ( ph  ->  ( ( A  x.  B )  -  B
)  =  ( ( A  -  1 )  x.  B ) )

Proof of Theorem mulsubfacd
StepHypRef Expression
1 muls1d.1 . . 3  |-  ( ph  ->  A  e.  CC )
2 ax-1cn 8088 . . . 4  |-  1  e.  CC
32a1i 9 . . 3  |-  ( ph  ->  1  e.  CC )
4 muls1d.2 . . 3  |-  ( ph  ->  B  e.  CC )
51, 3, 4subdird 8557 . 2  |-  ( ph  ->  ( ( A  - 
1 )  x.  B
)  =  ( ( A  x.  B )  -  ( 1  x.  B ) ) )
64mulid2d 8161 . . 3  |-  ( ph  ->  ( 1  x.  B
)  =  B )
76oveq2d 6016 . 2  |-  ( ph  ->  ( ( A  x.  B )  -  (
1  x.  B ) )  =  ( ( A  x.  B )  -  B ) )
85, 7eqtr2d 2263 1  |-  ( ph  ->  ( ( A  x.  B )  -  B
)  =  ( ( A  -  1 )  x.  B ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1395    e. wcel 2200  (class class class)co 6000   CCcc 7993   1c1 7996    x. cmul 8000    - cmin 8313
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-14 2203  ax-ext 2211  ax-sep 4201  ax-pow 4257  ax-pr 4292  ax-setind 4628  ax-resscn 8087  ax-1cn 8088  ax-icn 8090  ax-addcl 8091  ax-addrcl 8092  ax-mulcl 8093  ax-addcom 8095  ax-mulcom 8096  ax-addass 8097  ax-mulass 8098  ax-distr 8099  ax-i2m1 8100  ax-1rid 8102  ax-0id 8103  ax-rnegex 8104  ax-cnre 8106
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-ral 2513  df-rex 2514  df-reu 2515  df-rab 2517  df-v 2801  df-sbc 3029  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3888  df-br 4083  df-opab 4145  df-id 4383  df-xp 4724  df-rel 4725  df-cnv 4726  df-co 4727  df-dm 4728  df-iota 5277  df-fun 5319  df-fv 5325  df-riota 5953  df-ov 6003  df-oprab 6004  df-mpo 6005  df-sub 8315
This theorem is referenced by:  subhalfhalf  9342  maxabslemlub  11713  gausslemma2dlem1a  15731
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