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Theorem mulsubfacd 8736
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 8262 . . . 4  |-  1  e.  CC
32a1i 9 . . 3  |-  ( ph  ->  1  e.  CC )
4 muls1d.2 . . 3  |-  ( ph  ->  B  e.  CC )
51, 3, 4subdird 8732 . 2  |-  ( ph  ->  ( ( A  - 
1 )  x.  B
)  =  ( ( A  x.  B )  -  ( 1  x.  B ) ) )
64mullidd 8334 . . 3  |-  ( ph  ->  ( 1  x.  B
)  =  B )
76oveq2d 6091 . 2  |-  ( ph  ->  ( ( A  x.  B )  -  (
1  x.  B ) )  =  ( ( A  x.  B )  -  B ) )
85, 7eqtr2d 2272 1  |-  ( ph  ->  ( ( A  x.  B )  -  B
)  =  ( ( A  -  1 )  x.  B ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1402    e. wcel 2209  (class class class)co 6075   CCcc 8167   1c1 8170    x. cmul 8174    - cmin 8487
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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341  ax-setind 4679  ax-resscn 8261  ax-1cn 8262  ax-icn 8264  ax-addcl 8265  ax-addrcl 8266  ax-mulcl 8267  ax-addcom 8269  ax-mulcom 8270  ax-addass 8271  ax-mulass 8272  ax-distr 8273  ax-i2m1 8274  ax-1rid 8276  ax-0id 8277  ax-rnegex 8278  ax-cnre 8280
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-ral 2533  df-rex 2534  df-reu 2535  df-rab 2537  df-v 2823  df-sbc 3052  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-br 4126  df-opab 4188  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-iota 5332  df-fun 5374  df-fv 5380  df-riota 6028  df-ov 6078  df-oprab 6079  df-mpo 6080  df-sub 8489
This theorem is referenced by:  subhalfhalf  9519  maxabslemlub  11951  gausslemma2dlem1a  16091
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