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Theorem cncph 21389
Description: The set of complex numbers is an inner product (pre-Hilbert) space. (Contributed by Steve Rodriguez, 28-Apr-2007.) (Revised by Mario Carneiro, 7-Nov-2013.) (New usage is discouraged.)
Hypothesis
Ref Expression
cncph.6  |-  U  = 
<. <.  +  ,  x.  >. ,  abs >.
Assertion
Ref Expression
cncph  |-  U  e.  CPreHil
OLD
Dummy variables  x  y are mutually distinct and distinct from all other variables.

Proof of Theorem cncph
StepHypRef Expression
1 cncph.6 . 2  |-  U  = 
<. <.  +  ,  x.  >. ,  abs >.
2 eqid 2284 . . . 4  |-  <. <.  +  ,  x.  >. ,  abs >.  = 
<. <.  +  ,  x.  >. ,  abs >.
32cnnv 21237 . . 3  |-  <. <.  +  ,  x.  >. ,  abs >.  e.  NrmCVec
4 mulm1 9216 . . . . . . . . . . 11  |-  ( y  e.  CC  ->  ( -u 1  x.  y )  =  -u y )
54adantl 454 . . . . . . . . . 10  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( -u 1  x.  y )  =  -u y )
65oveq2d 5835 . . . . . . . . 9  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( x  +  (
-u 1  x.  y
) )  =  ( x  +  -u y
) )
7 negsub 9090 . . . . . . . . 9  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( x  +  -u y )  =  ( x  -  y ) )
86, 7eqtrd 2316 . . . . . . . 8  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( x  +  (
-u 1  x.  y
) )  =  ( x  -  y ) )
98fveq2d 5489 . . . . . . 7  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( abs `  (
x  +  ( -u
1  x.  y ) ) )  =  ( abs `  ( x  -  y ) ) )
109oveq1d 5834 . . . . . 6  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( ( abs `  (
x  +  ( -u
1  x.  y ) ) ) ^ 2 )  =  ( ( abs `  ( x  -  y ) ) ^ 2 ) )
1110oveq2d 5835 . . . . 5  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( ( ( abs `  ( x  +  y ) ) ^ 2 )  +  ( ( abs `  ( x  +  ( -u 1  x.  y ) ) ) ^ 2 ) )  =  ( ( ( abs `  ( x  +  y ) ) ^ 2 )  +  ( ( abs `  (
x  -  y ) ) ^ 2 ) ) )
12 sqabsadd 11761 . . . . . . . 8  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( ( abs `  (
x  +  y ) ) ^ 2 )  =  ( ( ( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) )  +  ( 2  x.  ( Re
`  ( x  x.  ( * `  y
) ) ) ) ) )
13 sqabssub 11762 . . . . . . . 8  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( ( abs `  (
x  -  y ) ) ^ 2 )  =  ( ( ( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) )  -  (
2  x.  ( Re
`  ( x  x.  ( * `  y
) ) ) ) ) )
1412, 13oveq12d 5837 . . . . . . 7  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( ( ( abs `  ( x  +  y ) ) ^ 2 )  +  ( ( abs `  ( x  -  y ) ) ^ 2 ) )  =  ( ( ( ( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) )  +  ( 2  x.  ( Re
`  ( x  x.  ( * `  y
) ) ) ) )  +  ( ( ( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) )  -  (
2  x.  ( Re
`  ( x  x.  ( * `  y
) ) ) ) ) ) )
15 abscl 11757 . . . . . . . . . . 11  |-  ( x  e.  CC  ->  ( abs `  x )  e.  RR )
1615recnd 8856 . . . . . . . . . 10  |-  ( x  e.  CC  ->  ( abs `  x )  e.  CC )
1716sqcld 11237 . . . . . . . . 9  |-  ( x  e.  CC  ->  (
( abs `  x
) ^ 2 )  e.  CC )
18 abscl 11757 . . . . . . . . . . 11  |-  ( y  e.  CC  ->  ( abs `  y )  e.  RR )
1918recnd 8856 . . . . . . . . . 10  |-  ( y  e.  CC  ->  ( abs `  y )  e.  CC )
2019sqcld 11237 . . . . . . . . 9  |-  ( y  e.  CC  ->  (
( abs `  y
) ^ 2 )  e.  CC )
21 addcl 8814 . . . . . . . . 9  |-  ( ( ( ( abs `  x
) ^ 2 )  e.  CC  /\  (
( abs `  y
) ^ 2 )  e.  CC )  -> 
( ( ( abs `  x ) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) )  e.  CC )
2217, 20, 21syl2an 465 . . . . . . . 8  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( ( ( abs `  x ) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) )  e.  CC )
23 2cn 9811 . . . . . . . . 9  |-  2  e.  CC
24 cjcl 11584 . . . . . . . . . . 11  |-  ( y  e.  CC  ->  (
* `  y )  e.  CC )
25 mulcl 8816 . . . . . . . . . . 11  |-  ( ( x  e.  CC  /\  ( * `  y
)  e.  CC )  ->  ( x  x.  ( * `  y
) )  e.  CC )
2624, 25sylan2 462 . . . . . . . . . 10  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( x  x.  (
* `  y )
)  e.  CC )
27 recl 11589 . . . . . . . . . . 11  |-  ( ( x  x.  ( * `
 y ) )  e.  CC  ->  (
Re `  ( x  x.  ( * `  y
) ) )  e.  RR )
2827recnd 8856 . . . . . . . . . 10  |-  ( ( x  x.  ( * `
 y ) )  e.  CC  ->  (
Re `  ( x  x.  ( * `  y
) ) )  e.  CC )
2926, 28syl 17 . . . . . . . . 9  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( Re `  (
x  x.  ( * `
 y ) ) )  e.  CC )
30 mulcl 8816 . . . . . . . . 9  |-  ( ( 2  e.  CC  /\  ( Re `  ( x  x.  ( * `  y ) ) )  e.  CC )  -> 
( 2  x.  (
Re `  ( x  x.  ( * `  y
) ) ) )  e.  CC )
3123, 29, 30sylancr 646 . . . . . . . 8  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( 2  x.  (
Re `  ( x  x.  ( * `  y
) ) ) )  e.  CC )
3222, 31, 22ppncand 9192 . . . . . . 7  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( ( ( ( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) )  +  ( 2  x.  ( Re
`  ( x  x.  ( * `  y
) ) ) ) )  +  ( ( ( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) )  -  (
2  x.  ( Re
`  ( x  x.  ( * `  y
) ) ) ) ) )  =  ( ( ( ( abs `  x ) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) )  +  ( ( ( abs `  x ) ^ 2 )  +  ( ( abs `  y
) ^ 2 ) ) ) )
3314, 32eqtrd 2316 . . . . . 6  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( ( ( abs `  ( x  +  y ) ) ^ 2 )  +  ( ( abs `  ( x  -  y ) ) ^ 2 ) )  =  ( ( ( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) )  +  ( ( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) ) ) )
34 2times 9838 . . . . . . . 8  |-  ( ( ( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) )  e.  CC  ->  ( 2  x.  (
( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) ) )  =  ( ( ( ( abs `  x ) ^ 2 )  +  ( ( abs `  y
) ^ 2 ) )  +  ( ( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) ) ) )
3534eqcomd 2289 . . . . . . 7  |-  ( ( ( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) )  e.  CC  ->  ( ( ( ( abs `  x ) ^ 2 )  +  ( ( abs `  y
) ^ 2 ) )  +  ( ( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) ) )  =  ( 2  x.  (
( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) ) ) )
3622, 35syl 17 . . . . . 6  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( ( ( ( abs `  x ) ^ 2 )  +  ( ( abs `  y
) ^ 2 ) )  +  ( ( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) ) )  =  ( 2  x.  (
( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) ) ) )
3733, 36eqtrd 2316 . . . . 5  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( ( ( abs `  ( x  +  y ) ) ^ 2 )  +  ( ( abs `  ( x  -  y ) ) ^ 2 ) )  =  ( 2  x.  ( ( ( abs `  x ) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) ) ) )
3811, 37eqtrd 2316 . . . 4  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( ( ( abs `  ( x  +  y ) ) ^ 2 )  +  ( ( abs `  ( x  +  ( -u 1  x.  y ) ) ) ^ 2 ) )  =  ( 2  x.  ( ( ( abs `  x ) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) ) ) )
3938rgen2a 2610 . . 3  |-  A. x  e.  CC  A. y  e.  CC  ( ( ( abs `  ( x  +  y ) ) ^ 2 )  +  ( ( abs `  (
x  +  ( -u
1  x.  y ) ) ) ^ 2 ) )  =  ( 2  x.  ( ( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) ) )
40 addex 10347 . . . 4  |-  +  e.  _V
41 mulex 10348 . . . 4  |-  x.  e.  _V
42 absf 11815 . . . . 5  |-  abs : CC
--> RR
43 cnex 8813 . . . . 5  |-  CC  e.  _V
44 fex 5710 . . . . 5  |-  ( ( abs : CC --> RR  /\  CC  e.  _V )  ->  abs  e.  _V )
4542, 43, 44mp2an 655 . . . 4  |-  abs  e.  _V
46 cnaddablo 21009 . . . . . . 7  |-  +  e.  AbelOp
47 ablogrpo 20943 . . . . . . 7  |-  (  +  e.  AbelOp  ->  +  e.  GrpOp )
4846, 47ax-mp 10 . . . . . 6  |-  +  e.  GrpOp
49 ax-addf 8811 . . . . . . 7  |-  +  :
( CC  X.  CC )
--> CC
5049fdmi 5359 . . . . . 6  |-  dom  +  =  ( CC  X.  CC )
5148, 50grporn 20871 . . . . 5  |-  CC  =  ran  +
5251isphg 21387 . . . 4  |-  ( (  +  e.  _V  /\  x.  e.  _V  /\  abs  e.  _V )  ->  ( <. <.  +  ,  x.  >. ,  abs >.  e.  CPreHil OLD  <->  (
<. <.  +  ,  x.  >. ,  abs >.  e.  NrmCVec  /\  A. x  e.  CC  A. y  e.  CC  (
( ( abs `  (
x  +  y ) ) ^ 2 )  +  ( ( abs `  ( x  +  (
-u 1  x.  y
) ) ) ^
2 ) )  =  ( 2  x.  (
( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) ) ) ) ) )
5340, 41, 45, 52mp3an 1279 . . 3  |-  ( <. <.  +  ,  x.  >. ,  abs >.  e.  CPreHil OLD  <->  ( <. <.  +  ,  x.  >. ,  abs >.  e.  NrmCVec  /\  A. x  e.  CC  A. y  e.  CC  ( ( ( abs `  ( x  +  y ) ) ^ 2 )  +  ( ( abs `  (
x  +  ( -u
1  x.  y ) ) ) ^ 2 ) )  =  ( 2  x.  ( ( ( abs `  x
) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) ) ) ) )
543, 39, 53mpbir2an 888 . 2  |-  <. <.  +  ,  x.  >. ,  abs >.  e.  CPreHil
OLD
551, 54eqeltri 2354 1  |-  U  e.  CPreHil
OLD
Colors of variables: wff set class
Syntax hints:    <-> wb 178    /\ wa 360    = wceq 1624    e. wcel 1685   A.wral 2544   _Vcvv 2789   <.cop 3644    X. cxp 4686   -->wf 5217   ` cfv 5221  (class class class)co 5819   CCcc 8730   RRcr 8731   1c1 8733    + caddc 8735    x. cmul 8737    - cmin 9032   -ucneg 9033   2c2 9790   ^cexp 11098   *ccj 11575   Recre 11576   abscabs 11713   GrpOpcgr 20845   AbelOpcablo 20940   NrmCVeccnv 21132   CPreHil OLDccphlo 21382
This theorem is referenced by:  elimphu  21391  cnchl  21487
This theorem was proved from axioms:  ax-1 7  ax-2 8  ax-3 9  ax-mp 10  ax-gen 1534  ax-5 1545  ax-17 1604  ax-9 1637  ax-8 1645  ax-13 1687  ax-14 1689  ax-6 1704  ax-7 1709  ax-11 1716  ax-12 1867  ax-ext 2265  ax-rep 4132  ax-sep 4142  ax-nul 4150  ax-pow 4187  ax-pr 4213  ax-un 4511  ax-cnex 8788  ax-resscn 8789  ax-1cn 8790  ax-icn 8791  ax-addcl 8792  ax-addrcl 8793  ax-mulcl 8794  ax-mulrcl 8795  ax-mulcom 8796  ax-addass 8797  ax-mulass 8798  ax-distr 8799  ax-i2m1 8800  ax-1ne0 8801  ax-1rid 8802  ax-rnegex 8803  ax-rrecex 8804  ax-cnre 8805  ax-pre-lttri 8806  ax-pre-lttrn 8807  ax-pre-ltadd 8808  ax-pre-mulgt0 8809  ax-pre-sup 8810  ax-addf 8811  ax-mulf 8812
This theorem depends on definitions:  df-bi 179  df-or 361  df-an 362  df-3or 937  df-3an 938  df-tru 1312  df-ex 1530  df-nf 1533  df-sb 1632  df-eu 2148  df-mo 2149  df-clab 2271  df-cleq 2277  df-clel 2280  df-nfc 2409  df-ne 2449  df-nel 2450  df-ral 2549  df-rex 2550  df-reu 2551  df-rmo 2552  df-rab 2553  df-v 2791  df-sbc 2993  df-csb 3083  df-dif 3156  df-un 3158  df-in 3160  df-ss 3167  df-pss 3169  df-nul 3457  df-if 3567  df-pw 3628  df-sn 3647  df-pr 3648  df-tp 3649  df-op 3650  df-uni 3829  df-iun 3908  df-br 4025  df-opab 4079  df-mpt 4080  df-tr 4115  df-eprel 4304  df-id 4308  df-po 4313  df-so 4314  df-fr 4351  df-we 4353  df-ord 4394  df-on 4395  df-lim 4396  df-suc 4397  df-om 4656  df-xp 4694  df-rel 4695  df-cnv 4696  df-co 4697  df-dm 4698  df-rn 4699  df-res 4700  df-ima 4701  df-fun 5223  df-fn 5224  df-f 5225  df-f1 5226  df-fo 5227  df-f1o 5228  df-fv 5229  df-ov 5822  df-oprab 5823  df-mpt2 5824  df-2nd 6084  df-iota 6252  df-riota 6299  df-recs 6383  df-rdg 6418  df-er 6655  df-en 6859  df-dom 6860  df-sdom 6861  df-sup 7189  df-pnf 8864  df-mnf 8865  df-xr 8866  df-ltxr 8867  df-le 8868  df-sub 9034  df-neg 9035  df-div 9419  df-nn 9742  df-2 9799  df-3 9800  df-n0 9961  df-z 10020  df-uz 10226  df-rp 10350  df-seq 11041  df-exp 11099  df-cj 11578  df-re 11579  df-im 11580  df-sqr 11714  df-abs 11715  df-grpo 20850  df-gid 20851  df-ablo 20941  df-vc 21094  df-nv 21140  df-ph 21383
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