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Theorem divass 10221
Description: An associative law for division. (Contributed by NM, 2-Aug-2004.)
Assertion
Ref Expression
divass  |-  ( ( A  e.  CC  /\  B  e.  CC  /\  ( C  e.  CC  /\  C  =/=  0 ) )  -> 
( ( A  x.  B )  /  C
)  =  ( A  x.  ( B  /  C ) ) )

Proof of Theorem divass
StepHypRef Expression
1 reccl 10210 . . 3  |-  ( ( C  e.  CC  /\  C  =/=  0 )  -> 
( 1  /  C
)  e.  CC )
2 mulass 9569 . . 3  |-  ( ( A  e.  CC  /\  B  e.  CC  /\  (
1  /  C )  e.  CC )  -> 
( ( A  x.  B )  x.  (
1  /  C ) )  =  ( A  x.  ( B  x.  ( 1  /  C
) ) ) )
31, 2syl3an3 1261 . 2  |-  ( ( A  e.  CC  /\  B  e.  CC  /\  ( C  e.  CC  /\  C  =/=  0 ) )  -> 
( ( A  x.  B )  x.  (
1  /  C ) )  =  ( A  x.  ( B  x.  ( 1  /  C
) ) ) )
4 mulcl 9565 . . . 4  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( A  x.  B
)  e.  CC )
543adant3 1014 . . 3  |-  ( ( A  e.  CC  /\  B  e.  CC  /\  ( C  e.  CC  /\  C  =/=  0 ) )  -> 
( A  x.  B
)  e.  CC )
6 simp3l 1022 . . 3  |-  ( ( A  e.  CC  /\  B  e.  CC  /\  ( C  e.  CC  /\  C  =/=  0 ) )  ->  C  e.  CC )
7 simp3r 1023 . . 3  |-  ( ( A  e.  CC  /\  B  e.  CC  /\  ( C  e.  CC  /\  C  =/=  0 ) )  ->  C  =/=  0 )
8 divrec 10219 . . 3  |-  ( ( ( A  x.  B
)  e.  CC  /\  C  e.  CC  /\  C  =/=  0 )  ->  (
( A  x.  B
)  /  C )  =  ( ( A  x.  B )  x.  ( 1  /  C
) ) )
95, 6, 7, 8syl3anc 1226 . 2  |-  ( ( A  e.  CC  /\  B  e.  CC  /\  ( C  e.  CC  /\  C  =/=  0 ) )  -> 
( ( A  x.  B )  /  C
)  =  ( ( A  x.  B )  x.  ( 1  /  C ) ) )
10 simp2 995 . . . 4  |-  ( ( A  e.  CC  /\  B  e.  CC  /\  ( C  e.  CC  /\  C  =/=  0 ) )  ->  B  e.  CC )
11 divrec 10219 . . . 4  |-  ( ( B  e.  CC  /\  C  e.  CC  /\  C  =/=  0 )  ->  ( B  /  C )  =  ( B  x.  (
1  /  C ) ) )
1210, 6, 7, 11syl3anc 1226 . . 3  |-  ( ( A  e.  CC  /\  B  e.  CC  /\  ( C  e.  CC  /\  C  =/=  0 ) )  -> 
( B  /  C
)  =  ( B  x.  ( 1  /  C ) ) )
1312oveq2d 6286 . 2  |-  ( ( A  e.  CC  /\  B  e.  CC  /\  ( C  e.  CC  /\  C  =/=  0 ) )  -> 
( A  x.  ( B  /  C ) )  =  ( A  x.  ( B  x.  (
1  /  C ) ) ) )
143, 9, 133eqtr4d 2505 1  |-  ( ( A  e.  CC  /\  B  e.  CC  /\  ( C  e.  CC  /\  C  =/=  0 ) )  -> 
( ( A  x.  B )  /  C
)  =  ( A  x.  ( B  /  C ) ) )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    /\ wa 367    /\ w3a 971    = wceq 1398    e. wcel 1823    =/= wne 2649  (class class class)co 6270   CCcc 9479   0cc0 9481   1c1 9482    x. cmul 9486    / cdiv 10202
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1623  ax-4 1636  ax-5 1709  ax-6 1752  ax-7 1795  ax-8 1825  ax-9 1827  ax-10 1842  ax-11 1847  ax-12 1859  ax-13 2004  ax-ext 2432  ax-sep 4560  ax-nul 4568  ax-pow 4615  ax-pr 4676  ax-un 6565  ax-resscn 9538  ax-1cn 9539  ax-icn 9540  ax-addcl 9541  ax-addrcl 9542  ax-mulcl 9543  ax-mulrcl 9544  ax-mulcom 9545  ax-addass 9546  ax-mulass 9547  ax-distr 9548  ax-i2m1 9549  ax-1ne0 9550  ax-1rid 9551  ax-rnegex 9552  ax-rrecex 9553  ax-cnre 9554  ax-pre-lttri 9555  ax-pre-lttrn 9556  ax-pre-ltadd 9557  ax-pre-mulgt0 9558
This theorem depends on definitions:  df-bi 185  df-or 368  df-an 369  df-3or 972  df-3an 973  df-tru 1401  df-ex 1618  df-nf 1622  df-sb 1745  df-eu 2288  df-mo 2289  df-clab 2440  df-cleq 2446  df-clel 2449  df-nfc 2604  df-ne 2651  df-nel 2652  df-ral 2809  df-rex 2810  df-reu 2811  df-rmo 2812  df-rab 2813  df-v 3108  df-sbc 3325  df-csb 3421  df-dif 3464  df-un 3466  df-in 3468  df-ss 3475  df-nul 3784  df-if 3930  df-pw 4001  df-sn 4017  df-pr 4019  df-op 4023  df-uni 4236  df-br 4440  df-opab 4498  df-mpt 4499  df-id 4784  df-po 4789  df-so 4790  df-xp 4994  df-rel 4995  df-cnv 4996  df-co 4997  df-dm 4998  df-rn 4999  df-res 5000  df-ima 5001  df-iota 5534  df-fun 5572  df-fn 5573  df-f 5574  df-f1 5575  df-fo 5576  df-f1o 5577  df-fv 5578  df-riota 6232  df-ov 6273  df-oprab 6274  df-mpt2 6275  df-er 7303  df-en 7510  df-dom 7511  df-sdom 7512  df-pnf 9619  df-mnf 9620  df-xr 9621  df-ltxr 9622  df-le 9623  df-sub 9798  df-neg 9799  df-div 10203
This theorem is referenced by:  div23  10222  div32  10223  divasszi  10290  divassd  10351  lt2mul2div  10416  zdivmul  10931  mertenslem1  13775  efi4p  13954  relogbreexp  23314  divsqrtsumlem  23507  basellem8  23559  logexprlim  23698  bposlem6  23762  lgsquadlem2  23828  chebbnd1lem3  23854  vmadivsum  23865  dchrmusum2  23877  dchrisum0lem1b  23898  dchrisum0lem2  23901  mudivsum  23913  mulog2sumlem2  23918  selberglem1  23928  selberglem2  23929  pntlemb  23980  pntlemr  23985  pntlemj  23986  pntlemf  23988  pntlemk  23989  pntlemo  23990  dvasin  30343  stoweidlem24  32045
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