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Theorem 8th4div3 9951
Description: An eighth of four thirds is a sixth. (Contributed by Paul Chapman, 24-Nov-2007.)
Assertion
Ref Expression
8th4div3  |-  ( ( 1  /  8 )  x.  ( 4  / 
3 ) )  =  ( 1  /  6
)

Proof of Theorem 8th4div3
StepHypRef Expression
1 ax-1cn 8811 . . . 4  |-  1  e.  CC
2 8re 9840 . . . . 5  |-  8  e.  RR
32recni 8865 . . . 4  |-  8  e.  CC
4 4cn 9836 . . . 4  |-  4  e.  CC
5 3cn 9834 . . . 4  |-  3  e.  CC
6 8pos 9852 . . . . 5  |-  0  <  8
72, 6gt0ne0ii 9325 . . . 4  |-  8  =/=  0
8 3ne0 9847 . . . 4  |-  3  =/=  0
91, 3, 4, 5, 7, 8divmuldivi 9536 . . 3  |-  ( ( 1  /  8 )  x.  ( 4  / 
3 ) )  =  ( ( 1  x.  4 )  /  (
8  x.  3 ) )
101, 4mulcomi 8859 . . . 4  |-  ( 1  x.  4 )  =  ( 4  x.  1 )
11 2cn 9832 . . . . . . . 8  |-  2  e.  CC
124, 11, 5mul32i 9024 . . . . . . 7  |-  ( ( 4  x.  2 )  x.  3 )  =  ( ( 4  x.  3 )  x.  2 )
13 4t2e8 9890 . . . . . . . 8  |-  ( 4  x.  2 )  =  8
1413oveq1i 5884 . . . . . . 7  |-  ( ( 4  x.  2 )  x.  3 )  =  ( 8  x.  3 )
1512, 14eqtr3i 2318 . . . . . 6  |-  ( ( 4  x.  3 )  x.  2 )  =  ( 8  x.  3 )
164, 5, 11mulassi 8862 . . . . . 6  |-  ( ( 4  x.  3 )  x.  2 )  =  ( 4  x.  (
3  x.  2 ) )
1715, 16eqtr3i 2318 . . . . 5  |-  ( 8  x.  3 )  =  ( 4  x.  (
3  x.  2 ) )
18 3t2e6 9888 . . . . . 6  |-  ( 3  x.  2 )  =  6
1918oveq2i 5885 . . . . 5  |-  ( 4  x.  ( 3  x.  2 ) )  =  ( 4  x.  6 )
2017, 19eqtri 2316 . . . 4  |-  ( 8  x.  3 )  =  ( 4  x.  6 )
2110, 20oveq12i 5886 . . 3  |-  ( ( 1  x.  4 )  /  ( 8  x.  3 ) )  =  ( ( 4  x.  1 )  /  (
4  x.  6 ) )
229, 21eqtri 2316 . 2  |-  ( ( 1  /  8 )  x.  ( 4  / 
3 ) )  =  ( ( 4  x.  1 )  /  (
4  x.  6 ) )
23 6re 9838 . . . 4  |-  6  e.  RR
2423recni 8865 . . 3  |-  6  e.  CC
25 6pos 9850 . . . 4  |-  0  <  6
2623, 25gt0ne0ii 9325 . . 3  |-  6  =/=  0
27 4re 9835 . . . 4  |-  4  e.  RR
28 4pos 9848 . . . 4  |-  0  <  4
2927, 28gt0ne0ii 9325 . . 3  |-  4  =/=  0
30 divcan5 9478 . . . 4  |-  ( ( 1  e.  CC  /\  ( 6  e.  CC  /\  6  =/=  0 )  /\  ( 4  e.  CC  /\  4  =/=  0 ) )  -> 
( ( 4  x.  1 )  /  (
4  x.  6 ) )  =  ( 1  /  6 ) )
311, 30mp3an1 1264 . . 3  |-  ( ( ( 6  e.  CC  /\  6  =/=  0 )  /\  ( 4  e.  CC  /\  4  =/=  0 ) )  -> 
( ( 4  x.  1 )  /  (
4  x.  6 ) )  =  ( 1  /  6 ) )
3224, 26, 4, 29, 31mp4an 654 . 2  |-  ( ( 4  x.  1 )  /  ( 4  x.  6 ) )  =  ( 1  /  6
)
3322, 32eqtri 2316 1  |-  ( ( 1  /  8 )  x.  ( 4  / 
3 ) )  =  ( 1  /  6
)
Colors of variables: wff set class
Syntax hints:    /\ wa 358    = wceq 1632    e. wcel 1696    =/= wne 2459  (class class class)co 5874   CCcc 8751   0cc0 8753   1c1 8754    x. cmul 8758    / cdiv 9439   2c2 9811   3c3 9812   4c4 9813   6c6 9815   8c8 9817
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-17 1606  ax-9 1644  ax-8 1661  ax-13 1698  ax-14 1700  ax-6 1715  ax-7 1720  ax-11 1727  ax-12 1878  ax-ext 2277  ax-sep 4157  ax-nul 4165  ax-pow 4204  ax-pr 4230  ax-un 4528  ax-resscn 8810  ax-1cn 8811  ax-icn 8812  ax-addcl 8813  ax-addrcl 8814  ax-mulcl 8815  ax-mulrcl 8816  ax-mulcom 8817  ax-addass 8818  ax-mulass 8819  ax-distr 8820  ax-i2m1 8821  ax-1ne0 8822  ax-1rid 8823  ax-rnegex 8824  ax-rrecex 8825  ax-cnre 8826  ax-pre-lttri 8827  ax-pre-lttrn 8828  ax-pre-ltadd 8829  ax-pre-mulgt0 8830
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-tru 1310  df-ex 1532  df-nf 1535  df-sb 1639  df-eu 2160  df-mo 2161  df-clab 2283  df-cleq 2289  df-clel 2292  df-nfc 2421  df-ne 2461  df-nel 2462  df-ral 2561  df-rex 2562  df-reu 2563  df-rmo 2564  df-rab 2565  df-v 2803  df-sbc 3005  df-csb 3095  df-dif 3168  df-un 3170  df-in 3172  df-ss 3179  df-nul 3469  df-if 3579  df-pw 3640  df-sn 3659  df-pr 3660  df-op 3662  df-uni 3844  df-br 4040  df-opab 4094  df-mpt 4095  df-id 4325  df-po 4330  df-so 4331  df-xp 4711  df-rel 4712  df-cnv 4713  df-co 4714  df-dm 4715  df-rn 4716  df-res 4717  df-ima 4718  df-iota 5235  df-fun 5273  df-fn 5274  df-f 5275  df-f1 5276  df-fo 5277  df-f1o 5278  df-fv 5279  df-ov 5877  df-oprab 5878  df-mpt2 5879  df-riota 6320  df-er 6676  df-en 6880  df-dom 6881  df-sdom 6882  df-pnf 8885  df-mnf 8886  df-xr 8887  df-ltxr 8888  df-le 8889  df-sub 9055  df-neg 9056  df-div 9440  df-2 9820  df-3 9821  df-4 9822  df-5 9823  df-6 9824  df-7 9825  df-8 9826
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