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Theorem stoweidlem61 29827
Description: This lemma proves that there exists a function  g as in the proof in [BrosowskiDeutsh] p. 92:  g is in the subalgebra, and for all  t in  T, abs( f(t) - g(t) ) < 2*ε. Here  F is used to represent f in the paper, and  E is used to represent ε. For this lemma there's the further assumption that the function  F to be approximated is nonnegative (this assumption is removed in a later theorem). (Contributed by Glauco Siliprandi, 20-Apr-2017.)
Hypotheses
Ref Expression
stoweidlem61.1  |-  F/_ t F
stoweidlem61.2  |-  F/ t
ph
stoweidlem61.3  |-  K  =  ( topGen `  ran  (,) )
stoweidlem61.4  |-  ( ph  ->  J  e.  Comp )
stoweidlem61.5  |-  T  = 
U. J
stoweidlem61.6  |-  ( ph  ->  T  =/=  (/) )
stoweidlem61.7  |-  C  =  ( J  Cn  K
)
stoweidlem61.8  |-  ( ph  ->  A  C_  C )
stoweidlem61.9  |-  ( (
ph  /\  f  e.  A  /\  g  e.  A
)  ->  ( t  e.  T  |->  ( ( f `  t )  +  ( g `  t ) ) )  e.  A )
stoweidlem61.10  |-  ( (
ph  /\  f  e.  A  /\  g  e.  A
)  ->  ( t  e.  T  |->  ( ( f `  t )  x.  ( g `  t ) ) )  e.  A )
stoweidlem61.11  |-  ( (
ph  /\  x  e.  RR )  ->  ( t  e.  T  |->  x )  e.  A )
stoweidlem61.12  |-  ( (
ph  /\  ( r  e.  T  /\  t  e.  T  /\  r  =/=  t ) )  ->  E. q  e.  A  ( q `  r
)  =/=  ( q `
 t ) )
stoweidlem61.13  |-  ( ph  ->  F  e.  C )
stoweidlem61.14  |-  ( ph  ->  A. t  e.  T 
0  <_  ( F `  t ) )
stoweidlem61.15  |-  ( ph  ->  E  e.  RR+ )
stoweidlem61.16  |-  ( ph  ->  E  <  ( 1  /  3 ) )
Assertion
Ref Expression
stoweidlem61  |-  ( ph  ->  E. g  e.  A  A. t  e.  T  ( abs `  ( ( g `  t )  -  ( F `  t ) ) )  <  ( 2  x.  E ) )
Distinct variable groups:    f, g,
q, r, t, x, A    f, E, g, q, r, t, x   
f, F, g, q, r, x    f, J, g, r, t    T, f, g, q, r, t, x    ph, f, g, q, r, x    t, K
Allowed substitution hints:    ph( t)    C( x, t, f, g, r, q)    F( t)    J( x, q)    K( x, f, g, r, q)

Proof of Theorem stoweidlem61
Dummy variables  j  n are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 stoweidlem61.1 . . 3  |-  F/_ t F
2 stoweidlem61.2 . . 3  |-  F/ t
ph
3 stoweidlem61.3 . . 3  |-  K  =  ( topGen `  ran  (,) )
4 stoweidlem61.5 . . 3  |-  T  = 
U. J
5 stoweidlem61.7 . . 3  |-  C  =  ( J  Cn  K
)
6 eqid 2438 . . 3  |-  ( j  e.  ( 0 ... n )  |->  { t  e.  T  |  ( F `  t )  <_  ( ( j  -  ( 1  / 
3 ) )  x.  E ) } )  =  ( j  e.  ( 0 ... n
)  |->  { t  e.  T  |  ( F `
 t )  <_ 
( ( j  -  ( 1  /  3
) )  x.  E
) } )
7 eqid 2438 . . 3  |-  ( j  e.  ( 0 ... n )  |->  { t  e.  T  |  ( ( j  +  ( 1  /  3 ) )  x.  E )  <_  ( F `  t ) } )  =  ( j  e.  ( 0 ... n
)  |->  { t  e.  T  |  ( ( j  +  ( 1  /  3 ) )  x.  E )  <_ 
( F `  t
) } )
8 stoweidlem61.4 . . 3  |-  ( ph  ->  J  e.  Comp )
9 stoweidlem61.6 . . 3  |-  ( ph  ->  T  =/=  (/) )
10 stoweidlem61.8 . . 3  |-  ( ph  ->  A  C_  C )
11 stoweidlem61.9 . . 3  |-  ( (
ph  /\  f  e.  A  /\  g  e.  A
)  ->  ( t  e.  T  |->  ( ( f `  t )  +  ( g `  t ) ) )  e.  A )
12 stoweidlem61.10 . . 3  |-  ( (
ph  /\  f  e.  A  /\  g  e.  A
)  ->  ( t  e.  T  |->  ( ( f `  t )  x.  ( g `  t ) ) )  e.  A )
13 stoweidlem61.11 . . 3  |-  ( (
ph  /\  x  e.  RR )  ->  ( t  e.  T  |->  x )  e.  A )
14 stoweidlem61.12 . . 3  |-  ( (
ph  /\  ( r  e.  T  /\  t  e.  T  /\  r  =/=  t ) )  ->  E. q  e.  A  ( q `  r
)  =/=  ( q `
 t ) )
15 stoweidlem61.13 . . 3  |-  ( ph  ->  F  e.  C )
16 stoweidlem61.14 . . 3  |-  ( ph  ->  A. t  e.  T 
0  <_  ( F `  t ) )
17 stoweidlem61.15 . . 3  |-  ( ph  ->  E  e.  RR+ )
18 stoweidlem61.16 . . 3  |-  ( ph  ->  E  <  ( 1  /  3 ) )
191, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18stoweidlem60 29826 . 2  |-  ( ph  ->  E. g  e.  A  A. t  e.  T  E. j  e.  RR  ( ( ( ( j  -  ( 4  /  3 ) )  x.  E )  < 
( F `  t
)  /\  ( F `  t )  <_  (
( j  -  (
1  /  3 ) )  x.  E ) )  /\  ( ( g `  t )  <  ( ( j  +  ( 1  / 
3 ) )  x.  E )  /\  (
( j  -  (
4  /  3 ) )  x.  E )  <  ( g `  t ) ) ) )
20 nfv 1673 . . . . 5  |-  F/ t  g  e.  A
212, 20nfan 1861 . . . 4  |-  F/ t ( ph  /\  g  e.  A )
2217ad2antrr 725 . . . . 5  |-  ( ( ( ph  /\  g  e.  A )  /\  t  e.  T )  ->  E  e.  RR+ )
233, 4, 5, 15fcnre 29718 . . . . . . 7  |-  ( ph  ->  F : T --> RR )
2423fnvinran 29707 . . . . . 6  |-  ( (
ph  /\  t  e.  T )  ->  ( F `  t )  e.  RR )
2524adantlr 714 . . . . 5  |-  ( ( ( ph  /\  g  e.  A )  /\  t  e.  T )  ->  ( F `  t )  e.  RR )
2610sselda 3351 . . . . . . 7  |-  ( (
ph  /\  g  e.  A )  ->  g  e.  C )
273, 4, 5, 26fcnre 29718 . . . . . 6  |-  ( (
ph  /\  g  e.  A )  ->  g : T --> RR )
2827fnvinran 29707 . . . . 5  |-  ( ( ( ph  /\  g  e.  A )  /\  t  e.  T )  ->  (
g `  t )  e.  RR )
29 simpll1 1027 . . . . . . . 8  |-  ( ( ( ( E  e.  RR+  /\  ( F `  t )  e.  RR  /\  ( g `  t
)  e.  RR )  /\  j  e.  RR )  /\  ( ( ( ( j  -  (
4  /  3 ) )  x.  E )  <  ( F `  t )  /\  ( F `  t )  <_  ( ( j  -  ( 1  /  3
) )  x.  E
) )  /\  (
( g `  t
)  <  ( (
j  +  ( 1  /  3 ) )  x.  E )  /\  ( ( j  -  ( 4  /  3
) )  x.  E
)  <  ( g `  t ) ) ) )  ->  E  e.  RR+ )
30 simpll2 1028 . . . . . . . 8  |-  ( ( ( ( E  e.  RR+  /\  ( F `  t )  e.  RR  /\  ( g `  t
)  e.  RR )  /\  j  e.  RR )  /\  ( ( ( ( j  -  (
4  /  3 ) )  x.  E )  <  ( F `  t )  /\  ( F `  t )  <_  ( ( j  -  ( 1  /  3
) )  x.  E
) )  /\  (
( g `  t
)  <  ( (
j  +  ( 1  /  3 ) )  x.  E )  /\  ( ( j  -  ( 4  /  3
) )  x.  E
)  <  ( g `  t ) ) ) )  ->  ( F `  t )  e.  RR )
31 simpll3 1029 . . . . . . . 8  |-  ( ( ( ( E  e.  RR+  /\  ( F `  t )  e.  RR  /\  ( g `  t
)  e.  RR )  /\  j  e.  RR )  /\  ( ( ( ( j  -  (
4  /  3 ) )  x.  E )  <  ( F `  t )  /\  ( F `  t )  <_  ( ( j  -  ( 1  /  3
) )  x.  E
) )  /\  (
( g `  t
)  <  ( (
j  +  ( 1  /  3 ) )  x.  E )  /\  ( ( j  -  ( 4  /  3
) )  x.  E
)  <  ( g `  t ) ) ) )  ->  ( g `  t )  e.  RR )
32 simplr 754 . . . . . . . 8  |-  ( ( ( ( E  e.  RR+  /\  ( F `  t )  e.  RR  /\  ( g `  t
)  e.  RR )  /\  j  e.  RR )  /\  ( ( ( ( j  -  (
4  /  3 ) )  x.  E )  <  ( F `  t )  /\  ( F `  t )  <_  ( ( j  -  ( 1  /  3
) )  x.  E
) )  /\  (
( g `  t
)  <  ( (
j  +  ( 1  /  3 ) )  x.  E )  /\  ( ( j  -  ( 4  /  3
) )  x.  E
)  <  ( g `  t ) ) ) )  ->  j  e.  RR )
33 simprll 761 . . . . . . . 8  |-  ( ( ( ( E  e.  RR+  /\  ( F `  t )  e.  RR  /\  ( g `  t
)  e.  RR )  /\  j  e.  RR )  /\  ( ( ( ( j  -  (
4  /  3 ) )  x.  E )  <  ( F `  t )  /\  ( F `  t )  <_  ( ( j  -  ( 1  /  3
) )  x.  E
) )  /\  (
( g `  t
)  <  ( (
j  +  ( 1  /  3 ) )  x.  E )  /\  ( ( j  -  ( 4  /  3
) )  x.  E
)  <  ( g `  t ) ) ) )  ->  ( (
j  -  ( 4  /  3 ) )  x.  E )  < 
( F `  t
) )
34 simprlr 762 . . . . . . . 8  |-  ( ( ( ( E  e.  RR+  /\  ( F `  t )  e.  RR  /\  ( g `  t
)  e.  RR )  /\  j  e.  RR )  /\  ( ( ( ( j  -  (
4  /  3 ) )  x.  E )  <  ( F `  t )  /\  ( F `  t )  <_  ( ( j  -  ( 1  /  3
) )  x.  E
) )  /\  (
( g `  t
)  <  ( (
j  +  ( 1  /  3 ) )  x.  E )  /\  ( ( j  -  ( 4  /  3
) )  x.  E
)  <  ( g `  t ) ) ) )  ->  ( F `  t )  <_  (
( j  -  (
1  /  3 ) )  x.  E ) )
35 simprrr 764 . . . . . . . 8  |-  ( ( ( ( E  e.  RR+  /\  ( F `  t )  e.  RR  /\  ( g `  t
)  e.  RR )  /\  j  e.  RR )  /\  ( ( ( ( j  -  (
4  /  3 ) )  x.  E )  <  ( F `  t )  /\  ( F `  t )  <_  ( ( j  -  ( 1  /  3
) )  x.  E
) )  /\  (
( g `  t
)  <  ( (
j  +  ( 1  /  3 ) )  x.  E )  /\  ( ( j  -  ( 4  /  3
) )  x.  E
)  <  ( g `  t ) ) ) )  ->  ( (
j  -  ( 4  /  3 ) )  x.  E )  < 
( g `  t
) )
36 simprrl 763 . . . . . . . 8  |-  ( ( ( ( E  e.  RR+  /\  ( F `  t )  e.  RR  /\  ( g `  t
)  e.  RR )  /\  j  e.  RR )  /\  ( ( ( ( j  -  (
4  /  3 ) )  x.  E )  <  ( F `  t )  /\  ( F `  t )  <_  ( ( j  -  ( 1  /  3
) )  x.  E
) )  /\  (
( g `  t
)  <  ( (
j  +  ( 1  /  3 ) )  x.  E )  /\  ( ( j  -  ( 4  /  3
) )  x.  E
)  <  ( g `  t ) ) ) )  ->  ( g `  t )  <  (
( j  +  ( 1  /  3 ) )  x.  E ) )
3729, 30, 31, 32, 33, 34, 35, 36stoweidlem13 29779 . . . . . . 7  |-  ( ( ( ( E  e.  RR+  /\  ( F `  t )  e.  RR  /\  ( g `  t
)  e.  RR )  /\  j  e.  RR )  /\  ( ( ( ( j  -  (
4  /  3 ) )  x.  E )  <  ( F `  t )  /\  ( F `  t )  <_  ( ( j  -  ( 1  /  3
) )  x.  E
) )  /\  (
( g `  t
)  <  ( (
j  +  ( 1  /  3 ) )  x.  E )  /\  ( ( j  -  ( 4  /  3
) )  x.  E
)  <  ( g `  t ) ) ) )  ->  ( abs `  ( ( g `  t )  -  ( F `  t )
) )  <  (
2  x.  E ) )
3837ex 434 . . . . . 6  |-  ( ( ( E  e.  RR+  /\  ( F `  t
)  e.  RR  /\  ( g `  t
)  e.  RR )  /\  j  e.  RR )  ->  ( ( ( ( ( j  -  ( 4  /  3
) )  x.  E
)  <  ( F `  t )  /\  ( F `  t )  <_  ( ( j  -  ( 1  /  3
) )  x.  E
) )  /\  (
( g `  t
)  <  ( (
j  +  ( 1  /  3 ) )  x.  E )  /\  ( ( j  -  ( 4  /  3
) )  x.  E
)  <  ( g `  t ) ) )  ->  ( abs `  (
( g `  t
)  -  ( F `
 t ) ) )  <  ( 2  x.  E ) ) )
3938rexlimdva 2836 . . . . 5  |-  ( ( E  e.  RR+  /\  ( F `  t )  e.  RR  /\  ( g `
 t )  e.  RR )  ->  ( E. j  e.  RR  ( ( ( ( j  -  ( 4  /  3 ) )  x.  E )  < 
( F `  t
)  /\  ( F `  t )  <_  (
( j  -  (
1  /  3 ) )  x.  E ) )  /\  ( ( g `  t )  <  ( ( j  +  ( 1  / 
3 ) )  x.  E )  /\  (
( j  -  (
4  /  3 ) )  x.  E )  <  ( g `  t ) ) )  ->  ( abs `  (
( g `  t
)  -  ( F `
 t ) ) )  <  ( 2  x.  E ) ) )
4022, 25, 28, 39syl3anc 1218 . . . 4  |-  ( ( ( ph  /\  g  e.  A )  /\  t  e.  T )  ->  ( E. j  e.  RR  ( ( ( ( j  -  ( 4  /  3 ) )  x.  E )  < 
( F `  t
)  /\  ( F `  t )  <_  (
( j  -  (
1  /  3 ) )  x.  E ) )  /\  ( ( g `  t )  <  ( ( j  +  ( 1  / 
3 ) )  x.  E )  /\  (
( j  -  (
4  /  3 ) )  x.  E )  <  ( g `  t ) ) )  ->  ( abs `  (
( g `  t
)  -  ( F `
 t ) ) )  <  ( 2  x.  E ) ) )
4121, 40ralimdaa 2788 . . 3  |-  ( (
ph  /\  g  e.  A )  ->  ( A. t  e.  T  E. j  e.  RR  ( ( ( ( j  -  ( 4  /  3 ) )  x.  E )  < 
( F `  t
)  /\  ( F `  t )  <_  (
( j  -  (
1  /  3 ) )  x.  E ) )  /\  ( ( g `  t )  <  ( ( j  +  ( 1  / 
3 ) )  x.  E )  /\  (
( j  -  (
4  /  3 ) )  x.  E )  <  ( g `  t ) ) )  ->  A. t  e.  T  ( abs `  ( ( g `  t )  -  ( F `  t ) ) )  <  ( 2  x.  E ) ) )
4241reximdva 2823 . 2  |-  ( ph  ->  ( E. g  e.  A  A. t  e.  T  E. j  e.  RR  ( ( ( ( j  -  (
4  /  3 ) )  x.  E )  <  ( F `  t )  /\  ( F `  t )  <_  ( ( j  -  ( 1  /  3
) )  x.  E
) )  /\  (
( g `  t
)  <  ( (
j  +  ( 1  /  3 ) )  x.  E )  /\  ( ( j  -  ( 4  /  3
) )  x.  E
)  <  ( g `  t ) ) )  ->  E. g  e.  A  A. t  e.  T  ( abs `  ( ( g `  t )  -  ( F `  t ) ) )  <  ( 2  x.  E ) ) )
4319, 42mpd 15 1  |-  ( ph  ->  E. g  e.  A  A. t  e.  T  ( abs `  ( ( g `  t )  -  ( F `  t ) ) )  <  ( 2  x.  E ) )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    /\ wa 369    /\ w3a 965    = wceq 1369   F/wnf 1589    e. wcel 1756   F/_wnfc 2561    =/= wne 2601   A.wral 2710   E.wrex 2711   {crab 2714    C_ wss 3323   (/)c0 3632   U.cuni 4086   class class class wbr 4287    e. cmpt 4345   ran crn 4836   ` cfv 5413  (class class class)co 6086   RRcr 9273   0cc0 9274   1c1 9275    + caddc 9277    x. cmul 9279    < clt 9410    <_ cle 9411    - cmin 9587    / cdiv 9985   2c2 10363   3c3 10364   4c4 10365   RR+crp 10983   (,)cioo 11292   ...cfz 11429   abscabs 12715   topGenctg 14368    Cn ccn 18808   Compccmp 18969
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1591  ax-4 1602  ax-5 1670  ax-6 1708  ax-7 1728  ax-8 1758  ax-9 1760  ax-10 1775  ax-11 1780  ax-12 1792  ax-13 1943  ax-ext 2419  ax-rep 4398  ax-sep 4408  ax-nul 4416  ax-pow 4465  ax-pr 4526  ax-un 6367  ax-inf2 7839  ax-cnex 9330  ax-resscn 9331  ax-1cn 9332  ax-icn 9333  ax-addcl 9334  ax-addrcl 9335  ax-mulcl 9336  ax-mulrcl 9337  ax-mulcom 9338  ax-addass 9339  ax-mulass 9340  ax-distr 9341  ax-i2m1 9342  ax-1ne0 9343  ax-1rid 9344  ax-rnegex 9345  ax-rrecex 9346  ax-cnre 9347  ax-pre-lttri 9348  ax-pre-lttrn 9349  ax-pre-ltadd 9350  ax-pre-mulgt0 9351  ax-pre-sup 9352  ax-mulf 9354
This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-3or 966  df-3an 967  df-tru 1372  df-fal 1375  df-ex 1587  df-nf 1590  df-sb 1701  df-eu 2256  df-mo 2257  df-clab 2425  df-cleq 2431  df-clel 2434  df-nfc 2563  df-ne 2603  df-nel 2604  df-ral 2715  df-rex 2716  df-reu 2717  df-rmo 2718  df-rab 2719  df-v 2969  df-sbc 3182  df-csb 3284  df-dif 3326  df-un 3328  df-in 3330  df-ss 3337  df-pss 3339  df-nul 3633  df-if 3787  df-pw 3857  df-sn 3873  df-pr 3875  df-tp 3877  df-op 3879  df-uni 4087  df-int 4124  df-iun 4168  df-iin 4169  df-br 4288  df-opab 4346  df-mpt 4347  df-tr 4381  df-eprel 4627  df-id 4631  df-po 4636  df-so 4637  df-fr 4674  df-se 4675  df-we 4676  df-ord 4717  df-on 4718  df-lim 4719  df-suc 4720  df-xp 4841  df-rel 4842  df-cnv 4843  df-co 4844  df-dm 4845  df-rn 4846  df-res 4847  df-ima 4848  df-iota 5376  df-fun 5415  df-fn 5416  df-f 5417  df-f1 5418  df-fo 5419  df-f1o 5420  df-fv 5421  df-isom 5422  df-riota 6047  df-ov 6089  df-oprab 6090  df-mpt2 6091  df-of 6315  df-om 6472  df-1st 6572  df-2nd 6573  df-supp 6686  df-recs 6824  df-rdg 6858  df-1o 6912  df-2o 6913  df-oadd 6916  df-er 7093  df-map 7208  df-pm 7209  df-ixp 7256  df-en 7303  df-dom 7304  df-sdom 7305  df-fin 7306  df-fsupp 7613  df-fi 7653  df-sup 7683  df-oi 7716  df-card 8101  df-cda 8329  df-pnf 9412  df-mnf 9413  df-xr 9414  df-ltxr 9415  df-le 9416  df-sub 9589  df-neg 9590  df-div 9986  df-nn 10315  df-2 10372  df-3 10373  df-4 10374  df-5 10375  df-6 10376  df-7 10377  df-8 10378  df-9 10379  df-10 10380  df-n0 10572  df-z 10639  df-dec 10748  df-uz 10854  df-q 10946  df-rp 10984  df-xneg 11081  df-xadd 11082  df-xmul 11083  df-ioo 11296  df-ioc 11297  df-ico 11298  df-icc 11299  df-fz 11430  df-fzo 11541  df-fl 11634  df-seq 11799  df-exp 11858  df-hash 12096  df-cj 12580  df-re 12581  df-im 12582  df-sqr 12716  df-abs 12717  df-clim 12958  df-rlim 12959  df-sum 13156  df-struct 14168  df-ndx 14169  df-slot 14170  df-base 14171  df-sets 14172  df-ress 14173  df-plusg 14243  df-mulr 14244  df-starv 14245  df-sca 14246  df-vsca 14247  df-ip 14248  df-tset 14249  df-ple 14250  df-ds 14252  df-unif 14253  df-hom 14254  df-cco 14255  df-rest 14353  df-topn 14354  df-0g 14372  df-gsum 14373  df-topgen 14374  df-pt 14375  df-prds 14378  df-xrs 14432  df-qtop 14437  df-imas 14438  df-xps 14440  df-mre 14516  df-mrc 14517  df-acs 14519  df-mnd 15407  df-submnd 15457  df-mulg 15539  df-cntz 15826  df-cmn 16270  df-psmet 17789  df-xmet 17790  df-met 17791  df-bl 17792  df-mopn 17793  df-cnfld 17799  df-top 18483  df-bases 18485  df-topon 18486  df-topsp 18487  df-cld 18603  df-cn 18811  df-cnp 18812  df-cmp 18970  df-tx 19115  df-hmeo 19308  df-xms 19875  df-ms 19876  df-tms 19877
This theorem is referenced by:  stoweidlem62  29828
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