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Theorem cncph 22308
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

Proof of Theorem cncph
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 cncph.6 . 2  |-  U  = 
<. <.  +  ,  x.  >. ,  abs >.
2 eqid 2435 . . . 4  |-  <. <.  +  ,  x.  >. ,  abs >.  = 
<. <.  +  ,  x.  >. ,  abs >.
32cnnv 22156 . . 3  |-  <. <.  +  ,  x.  >. ,  abs >.  e.  NrmCVec
4 mulm1 9464 . . . . . . . . . . 11  |-  ( y  e.  CC  ->  ( -u 1  x.  y )  =  -u y )
54adantl 453 . . . . . . . . . 10  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( -u 1  x.  y )  =  -u y )
65oveq2d 6088 . . . . . . . . 9  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( x  +  (
-u 1  x.  y
) )  =  ( x  +  -u y
) )
7 negsub 9338 . . . . . . . . 9  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( x  +  -u y )  =  ( x  -  y ) )
86, 7eqtrd 2467 . . . . . . . 8  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( x  +  (
-u 1  x.  y
) )  =  ( x  -  y ) )
98fveq2d 5723 . . . . . . 7  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( abs `  (
x  +  ( -u
1  x.  y ) ) )  =  ( abs `  ( x  -  y ) ) )
109oveq1d 6087 . . . . . 6  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( ( abs `  (
x  +  ( -u
1  x.  y ) ) ) ^ 2 )  =  ( ( abs `  ( x  -  y ) ) ^ 2 ) )
1110oveq2d 6088 . . . . 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 12075 . . . . . . . 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 12076 . . . . . . . 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 6090 . . . . . . 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 12071 . . . . . . . . . . 11  |-  ( x  e.  CC  ->  ( abs `  x )  e.  RR )
1615recnd 9103 . . . . . . . . . 10  |-  ( x  e.  CC  ->  ( abs `  x )  e.  CC )
1716sqcld 11509 . . . . . . . . 9  |-  ( x  e.  CC  ->  (
( abs `  x
) ^ 2 )  e.  CC )
18 abscl 12071 . . . . . . . . . . 11  |-  ( y  e.  CC  ->  ( abs `  y )  e.  RR )
1918recnd 9103 . . . . . . . . . 10  |-  ( y  e.  CC  ->  ( abs `  y )  e.  CC )
2019sqcld 11509 . . . . . . . . 9  |-  ( y  e.  CC  ->  (
( abs `  y
) ^ 2 )  e.  CC )
21 addcl 9061 . . . . . . . . 9  |-  ( ( ( ( abs `  x
) ^ 2 )  e.  CC  /\  (
( abs `  y
) ^ 2 )  e.  CC )  -> 
( ( ( abs `  x ) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) )  e.  CC )
2217, 20, 21syl2an 464 . . . . . . . 8  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( ( ( abs `  x ) ^ 2 )  +  ( ( abs `  y ) ^ 2 ) )  e.  CC )
23 2cn 10059 . . . . . . . . 9  |-  2  e.  CC
24 cjcl 11898 . . . . . . . . . . 11  |-  ( y  e.  CC  ->  (
* `  y )  e.  CC )
25 mulcl 9063 . . . . . . . . . . 11  |-  ( ( x  e.  CC  /\  ( * `  y
)  e.  CC )  ->  ( x  x.  ( * `  y
) )  e.  CC )
2624, 25sylan2 461 . . . . . . . . . 10  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( x  x.  (
* `  y )
)  e.  CC )
27 recl 11903 . . . . . . . . . . 11  |-  ( ( x  x.  ( * `
 y ) )  e.  CC  ->  (
Re `  ( x  x.  ( * `  y
) ) )  e.  RR )
2827recnd 9103 . . . . . . . . . 10  |-  ( ( x  x.  ( * `
 y ) )  e.  CC  ->  (
Re `  ( x  x.  ( * `  y
) ) )  e.  CC )
2926, 28syl 16 . . . . . . . . 9  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( Re `  (
x  x.  ( * `
 y ) ) )  e.  CC )
30 mulcl 9063 . . . . . . . . 9  |-  ( ( 2  e.  CC  /\  ( Re `  ( x  x.  ( * `  y ) ) )  e.  CC )  -> 
( 2  x.  (
Re `  ( x  x.  ( * `  y
) ) ) )  e.  CC )
3123, 29, 30sylancr 645 . . . . . . . 8  |-  ( ( x  e.  CC  /\  y  e.  CC )  ->  ( 2  x.  (
Re `  ( x  x.  ( * `  y
) ) ) )  e.  CC )
3222, 31, 22ppncand 9440 . . . . . . 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 2467 . . . . . 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 10088 . . . . . . . 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 2440 . . . . . . 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 16 . . . . . 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 2467 . . . . 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 2467 . . . 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 2764 . . 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 10599 . . . 4  |-  +  e.  _V
41 mulex 10600 . . . 4  |-  x.  e.  _V
42 absf 12129 . . . . 5  |-  abs : CC
--> RR
43 cnex 9060 . . . . 5  |-  CC  e.  _V
44 fex 5960 . . . . 5  |-  ( ( abs : CC --> RR  /\  CC  e.  _V )  ->  abs  e.  _V )
4542, 43, 44mp2an 654 . . . 4  |-  abs  e.  _V
46 cnaddablo 21926 . . . . . . 7  |-  +  e.  AbelOp
47 ablogrpo 21860 . . . . . . 7  |-  (  +  e.  AbelOp  ->  +  e.  GrpOp )
4846, 47ax-mp 8 . . . . . 6  |-  +  e.  GrpOp
49 ax-addf 9058 . . . . . . 7  |-  +  :
( CC  X.  CC )
--> CC
5049fdmi 5587 . . . . . 6  |-  dom  +  =  ( CC  X.  CC )
5148, 50grporn 21788 . . . . 5  |-  CC  =  ran  +
5251isphg 22306 . . . 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 887 . 2  |-  <. <.  +  ,  x.  >. ,  abs >.  e.  CPreHil
OLD
551, 54eqeltri 2505 1  |-  U  e.  CPreHil
OLD
Colors of variables: wff set class
Syntax hints:    <-> wb 177    /\ wa 359    = wceq 1652    e. wcel 1725   A.wral 2697   _Vcvv 2948   <.cop 3809    X. cxp 4867   -->wf 5441   ` cfv 5445  (class class class)co 6072   CCcc 8977   RRcr 8978   1c1 8980    + caddc 8982    x. cmul 8984    - cmin 9280   -ucneg 9281   2c2 10038   ^cexp 11370   *ccj 11889   Recre 11890   abscabs 12027   GrpOpcgr 21762   AbelOpcablo 21857   NrmCVeccnv 22051   CPreHil OLDccphlo 22301
This theorem is referenced by:  elimphu  22310  cnchl  22406
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1555  ax-5 1566  ax-17 1626  ax-9 1666  ax-8 1687  ax-13 1727  ax-14 1729  ax-6 1744  ax-7 1749  ax-11 1761  ax-12 1950  ax-ext 2416  ax-rep 4312  ax-sep 4322  ax-nul 4330  ax-pow 4369  ax-pr 4395  ax-un 4692  ax-cnex 9035  ax-resscn 9036  ax-1cn 9037  ax-icn 9038  ax-addcl 9039  ax-addrcl 9040  ax-mulcl 9041  ax-mulrcl 9042  ax-mulcom 9043  ax-addass 9044  ax-mulass 9045  ax-distr 9046  ax-i2m1 9047  ax-1ne0 9048  ax-1rid 9049  ax-rnegex 9050  ax-rrecex 9051  ax-cnre 9052  ax-pre-lttri 9053  ax-pre-lttrn 9054  ax-pre-ltadd 9055  ax-pre-mulgt0 9056  ax-pre-sup 9057  ax-addf 9058  ax-mulf 9059
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3or 937  df-3an 938  df-tru 1328  df-ex 1551  df-nf 1554  df-sb 1659  df-eu 2284  df-mo 2285  df-clab 2422  df-cleq 2428  df-clel 2431  df-nfc 2560  df-ne 2600  df-nel 2601  df-ral 2702  df-rex 2703  df-reu 2704  df-rmo 2705  df-rab 2706  df-v 2950  df-sbc 3154  df-csb 3244  df-dif 3315  df-un 3317  df-in 3319  df-ss 3326  df-pss 3328  df-nul 3621  df-if 3732  df-pw 3793  df-sn 3812  df-pr 3813  df-tp 3814  df-op 3815  df-uni 4008  df-iun 4087  df-br 4205  df-opab 4259  df-mpt 4260  df-tr 4295  df-eprel 4486  df-id 4490  df-po 4495  df-so 4496  df-fr 4533  df-we 4535  df-ord 4576  df-on 4577  df-lim 4578  df-suc 4579  df-om 4837  df-xp 4875  df-rel 4876  df-cnv 4877  df-co 4878  df-dm 4879  df-rn 4880  df-res 4881  df-ima 4882  df-iota 5409  df-fun 5447  df-fn 5448  df-f 5449  df-f1 5450  df-fo 5451  df-f1o 5452  df-fv 5453  df-ov 6075  df-oprab 6076  df-mpt2 6077  df-2nd 6341  df-riota 6540  df-recs 6624  df-rdg 6659  df-er 6896  df-en 7101  df-dom 7102  df-sdom 7103  df-sup 7437  df-pnf 9111  df-mnf 9112  df-xr 9113  df-ltxr 9114  df-le 9115  df-sub 9282  df-neg 9283  df-div 9667  df-nn 9990  df-2 10047  df-3 10048  df-n0 10211  df-z 10272  df-uz 10478  df-rp 10602  df-seq 11312  df-exp 11371  df-cj 11892  df-re 11893  df-im 11894  df-sqr 12028  df-abs 12029  df-grpo 21767  df-gid 21768  df-ablo 21858  df-vc 22013  df-nv 22059  df-ph 22302
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