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Theorem nmcoplbi 23484
Description: A lower bound for the norm of a continuous linear operator. Theorem 3.5(ii) of [Beran] p. 99. (Contributed by NM, 7-Feb-2006.) (Revised by Mario Carneiro, 17-Nov-2013.) (New usage is discouraged.)
Hypotheses
Ref Expression
nmcopex.1  |-  T  e. 
LinOp
nmcopex.2  |-  T  e. 
ConOp
Assertion
Ref Expression
nmcoplbi  |-  ( A  e.  ~H  ->  ( normh `  ( T `  A ) )  <_ 
( ( normop `  T
)  x.  ( normh `  A ) ) )

Proof of Theorem nmcoplbi
StepHypRef Expression
1 0le0 10037 . . . . 5  |-  0  <_  0
21a1i 11 . . . 4  |-  ( A  =  0h  ->  0  <_  0 )
3 fveq2 5687 . . . . . . 7  |-  ( A  =  0h  ->  ( T `  A )  =  ( T `  0h ) )
4 nmcopex.1 . . . . . . . 8  |-  T  e. 
LinOp
54lnop0i 23426 . . . . . . 7  |-  ( T `
 0h )  =  0h
63, 5syl6eq 2452 . . . . . 6  |-  ( A  =  0h  ->  ( T `  A )  =  0h )
76fveq2d 5691 . . . . 5  |-  ( A  =  0h  ->  ( normh `  ( T `  A ) )  =  ( normh `  0h )
)
8 norm0 22583 . . . . 5  |-  ( normh `  0h )  =  0
97, 8syl6eq 2452 . . . 4  |-  ( A  =  0h  ->  ( normh `  ( T `  A ) )  =  0 )
10 fveq2 5687 . . . . . . 7  |-  ( A  =  0h  ->  ( normh `  A )  =  ( normh `  0h )
)
1110, 8syl6eq 2452 . . . . . 6  |-  ( A  =  0h  ->  ( normh `  A )  =  0 )
1211oveq2d 6056 . . . . 5  |-  ( A  =  0h  ->  (
( normop `  T )  x.  ( normh `  A )
)  =  ( (
normop `  T )  x.  0 ) )
13 nmcopex.2 . . . . . . . 8  |-  T  e. 
ConOp
144, 13nmcopexi 23483 . . . . . . 7  |-  ( normop `  T )  e.  RR
1514recni 9058 . . . . . 6  |-  ( normop `  T )  e.  CC
1615mul01i 9212 . . . . 5  |-  ( (
normop `  T )  x.  0 )  =  0
1712, 16syl6eq 2452 . . . 4  |-  ( A  =  0h  ->  (
( normop `  T )  x.  ( normh `  A )
)  =  0 )
182, 9, 173brtr4d 4202 . . 3  |-  ( A  =  0h  ->  ( normh `  ( T `  A ) )  <_ 
( ( normop `  T
)  x.  ( normh `  A ) ) )
1918adantl 453 . 2  |-  ( ( A  e.  ~H  /\  A  =  0h )  ->  ( normh `  ( T `  A ) )  <_ 
( ( normop `  T
)  x.  ( normh `  A ) ) )
20 normcl 22580 . . . . . . . . 9  |-  ( A  e.  ~H  ->  ( normh `  A )  e.  RR )
2120adantr 452 . . . . . . . 8  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( normh `  A )  e.  RR )
22 normne0 22585 . . . . . . . . 9  |-  ( A  e.  ~H  ->  (
( normh `  A )  =/=  0  <->  A  =/=  0h )
)
2322biimpar 472 . . . . . . . 8  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( normh `  A )  =/=  0 )
2421, 23rereccld 9797 . . . . . . 7  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( 1  /  ( normh `  A ) )  e.  RR )
25 normgt0 22582 . . . . . . . . . 10  |-  ( A  e.  ~H  ->  ( A  =/=  0h  <->  0  <  (
normh `  A ) ) )
2625biimpa 471 . . . . . . . . 9  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
0  <  ( normh `  A ) )
2721, 26recgt0d 9901 . . . . . . . 8  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
0  <  ( 1  /  ( normh `  A
) ) )
28 0re 9047 . . . . . . . . 9  |-  0  e.  RR
29 ltle 9119 . . . . . . . . 9  |-  ( ( 0  e.  RR  /\  ( 1  /  ( normh `  A ) )  e.  RR )  -> 
( 0  <  (
1  /  ( normh `  A ) )  -> 
0  <_  ( 1  /  ( normh `  A
) ) ) )
3028, 29mpan 652 . . . . . . . 8  |-  ( ( 1  /  ( normh `  A ) )  e.  RR  ->  ( 0  <  ( 1  / 
( normh `  A )
)  ->  0  <_  ( 1  /  ( normh `  A ) ) ) )
3124, 27, 30sylc 58 . . . . . . 7  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
0  <_  ( 1  /  ( normh `  A
) ) )
3224, 31absidd 12180 . . . . . 6  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( abs `  (
1  /  ( normh `  A ) ) )  =  ( 1  / 
( normh `  A )
) )
3332oveq1d 6055 . . . . 5  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( ( abs `  (
1  /  ( normh `  A ) ) )  x.  ( normh `  ( T `  A )
) )  =  ( ( 1  /  ( normh `  A ) )  x.  ( normh `  ( T `  A )
) ) )
3424recnd 9070 . . . . . . . 8  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( 1  /  ( normh `  A ) )  e.  CC )
35 simpl 444 . . . . . . . 8  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  ->  A  e.  ~H )
364lnopmuli 23428 . . . . . . . 8  |-  ( ( ( 1  /  ( normh `  A ) )  e.  CC  /\  A  e.  ~H )  ->  ( T `  ( (
1  /  ( normh `  A ) )  .h  A ) )  =  ( ( 1  / 
( normh `  A )
)  .h  ( T `
 A ) ) )
3734, 35, 36syl2anc 643 . . . . . . 7  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( T `  (
( 1  /  ( normh `  A ) )  .h  A ) )  =  ( ( 1  /  ( normh `  A
) )  .h  ( T `  A )
) )
3837fveq2d 5691 . . . . . 6  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( normh `  ( T `  ( ( 1  / 
( normh `  A )
)  .h  A ) ) )  =  (
normh `  ( ( 1  /  ( normh `  A
) )  .h  ( T `  A )
) ) )
394lnopfi 23425 . . . . . . . . 9  |-  T : ~H
--> ~H
4039ffvelrni 5828 . . . . . . . 8  |-  ( A  e.  ~H  ->  ( T `  A )  e.  ~H )
4140adantr 452 . . . . . . 7  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( T `  A
)  e.  ~H )
42 norm-iii 22595 . . . . . . 7  |-  ( ( ( 1  /  ( normh `  A ) )  e.  CC  /\  ( T `  A )  e.  ~H )  ->  ( normh `  ( ( 1  /  ( normh `  A
) )  .h  ( T `  A )
) )  =  ( ( abs `  (
1  /  ( normh `  A ) ) )  x.  ( normh `  ( T `  A )
) ) )
4334, 41, 42syl2anc 643 . . . . . 6  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( normh `  ( (
1  /  ( normh `  A ) )  .h  ( T `  A
) ) )  =  ( ( abs `  (
1  /  ( normh `  A ) ) )  x.  ( normh `  ( T `  A )
) ) )
4438, 43eqtrd 2436 . . . . 5  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( normh `  ( T `  ( ( 1  / 
( normh `  A )
)  .h  A ) ) )  =  ( ( abs `  (
1  /  ( normh `  A ) ) )  x.  ( normh `  ( T `  A )
) ) )
45 normcl 22580 . . . . . . . . 9  |-  ( ( T `  A )  e.  ~H  ->  ( normh `  ( T `  A ) )  e.  RR )
4640, 45syl 16 . . . . . . . 8  |-  ( A  e.  ~H  ->  ( normh `  ( T `  A ) )  e.  RR )
4746adantr 452 . . . . . . 7  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( normh `  ( T `  A ) )  e.  RR )
4847recnd 9070 . . . . . 6  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( normh `  ( T `  A ) )  e.  CC )
4921recnd 9070 . . . . . 6  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( normh `  A )  e.  CC )
5048, 49, 23divrec2d 9750 . . . . 5  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( ( normh `  ( T `  A )
)  /  ( normh `  A ) )  =  ( ( 1  / 
( normh `  A )
)  x.  ( normh `  ( T `  A
) ) ) )
5133, 44, 503eqtr4rd 2447 . . . 4  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( ( normh `  ( T `  A )
)  /  ( normh `  A ) )  =  ( normh `  ( T `  ( ( 1  / 
( normh `  A )
)  .h  A ) ) ) )
52 hvmulcl 22469 . . . . . 6  |-  ( ( ( 1  /  ( normh `  A ) )  e.  CC  /\  A  e.  ~H )  ->  (
( 1  /  ( normh `  A ) )  .h  A )  e. 
~H )
5334, 35, 52syl2anc 643 . . . . 5  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( ( 1  / 
( normh `  A )
)  .h  A )  e.  ~H )
54 normcl 22580 . . . . . . 7  |-  ( ( ( 1  /  ( normh `  A ) )  .h  A )  e. 
~H  ->  ( normh `  (
( 1  /  ( normh `  A ) )  .h  A ) )  e.  RR )
5553, 54syl 16 . . . . . 6  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( normh `  ( (
1  /  ( normh `  A ) )  .h  A ) )  e.  RR )
56 norm1 22704 . . . . . 6  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( normh `  ( (
1  /  ( normh `  A ) )  .h  A ) )  =  1 )
57 eqle 9132 . . . . . 6  |-  ( ( ( normh `  ( (
1  /  ( normh `  A ) )  .h  A ) )  e.  RR  /\  ( normh `  ( ( 1  / 
( normh `  A )
)  .h  A ) )  =  1 )  ->  ( normh `  (
( 1  /  ( normh `  A ) )  .h  A ) )  <_  1 )
5855, 56, 57syl2anc 643 . . . . 5  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( normh `  ( (
1  /  ( normh `  A ) )  .h  A ) )  <_ 
1 )
59 nmoplb 23363 . . . . . 6  |-  ( ( T : ~H --> ~H  /\  ( ( 1  / 
( normh `  A )
)  .h  A )  e.  ~H  /\  ( normh `  ( ( 1  /  ( normh `  A
) )  .h  A
) )  <_  1
)  ->  ( normh `  ( T `  (
( 1  /  ( normh `  A ) )  .h  A ) ) )  <_  ( normop `  T
) )
6039, 59mp3an1 1266 . . . . 5  |-  ( ( ( ( 1  / 
( normh `  A )
)  .h  A )  e.  ~H  /\  ( normh `  ( ( 1  /  ( normh `  A
) )  .h  A
) )  <_  1
)  ->  ( normh `  ( T `  (
( 1  /  ( normh `  A ) )  .h  A ) ) )  <_  ( normop `  T
) )
6153, 58, 60syl2anc 643 . . . 4  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( normh `  ( T `  ( ( 1  / 
( normh `  A )
)  .h  A ) ) )  <_  ( normop `  T ) )
6251, 61eqbrtrd 4192 . . 3  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( ( normh `  ( T `  A )
)  /  ( normh `  A ) )  <_ 
( normop `  T )
)
6314a1i 11 . . . 4  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( normop `  T )  e.  RR )
64 ledivmul2 9843 . . . 4  |-  ( ( ( normh `  ( T `  A ) )  e.  RR  /\  ( normop `  T )  e.  RR  /\  ( ( normh `  A
)  e.  RR  /\  0  <  ( normh `  A
) ) )  -> 
( ( ( normh `  ( T `  A
) )  /  ( normh `  A ) )  <_  ( normop `  T
)  <->  ( normh `  ( T `  A )
)  <_  ( ( normop `  T )  x.  ( normh `  A ) ) ) )
6547, 63, 21, 26, 64syl112anc 1188 . . 3  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( ( ( normh `  ( T `  A
) )  /  ( normh `  A ) )  <_  ( normop `  T
)  <->  ( normh `  ( T `  A )
)  <_  ( ( normop `  T )  x.  ( normh `  A ) ) ) )
6662, 65mpbid 202 . 2  |-  ( ( A  e.  ~H  /\  A  =/=  0h )  -> 
( normh `  ( T `  A ) )  <_ 
( ( normop `  T
)  x.  ( normh `  A ) ) )
6719, 66pm2.61dane 2645 1  |-  ( A  e.  ~H  ->  ( normh `  ( T `  A ) )  <_ 
( ( normop `  T
)  x.  ( normh `  A ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 177    /\ wa 359    = wceq 1649    e. wcel 1721    =/= wne 2567   class class class wbr 4172   -->wf 5409   ` cfv 5413  (class class class)co 6040   CCcc 8944   RRcr 8945   0cc0 8946   1c1 8947    x. cmul 8951    < clt 9076    <_ cle 9077    / cdiv 9633   abscabs 11994   ~Hchil 22375    .h csm 22377   normhcno 22379   0hc0v 22380   normopcnop 22401   ConOpccop 22402   LinOpclo 22403
This theorem is referenced by:  nmcoplb  23486  cnlnadjlem2  23524  cnlnadjlem7  23529
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1552  ax-5 1563  ax-17 1623  ax-9 1662  ax-8 1683  ax-13 1723  ax-14 1725  ax-6 1740  ax-7 1745  ax-11 1757  ax-12 1946  ax-ext 2385  ax-rep 4280  ax-sep 4290  ax-nul 4298  ax-pow 4337  ax-pr 4363  ax-un 4660  ax-cnex 9002  ax-resscn 9003  ax-1cn 9004  ax-icn 9005  ax-addcl 9006  ax-addrcl 9007  ax-mulcl 9008  ax-mulrcl 9009  ax-mulcom 9010  ax-addass 9011  ax-mulass 9012  ax-distr 9013  ax-i2m1 9014  ax-1ne0 9015  ax-1rid 9016  ax-rnegex 9017  ax-rrecex 9018  ax-cnre 9019  ax-pre-lttri 9020  ax-pre-lttrn 9021  ax-pre-ltadd 9022  ax-pre-mulgt0 9023  ax-pre-sup 9024  ax-hilex 22455  ax-hfvadd 22456  ax-hvcom 22457  ax-hvass 22458  ax-hv0cl 22459  ax-hvaddid 22460  ax-hfvmul 22461  ax-hvmulid 22462  ax-hvmulass 22463  ax-hvdistr1 22464  ax-hvdistr2 22465  ax-hvmul0 22466  ax-hfi 22534  ax-his1 22537  ax-his2 22538  ax-his3 22539  ax-his4 22540
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3or 937  df-3an 938  df-tru 1325  df-ex 1548  df-nf 1551  df-sb 1656  df-eu 2258  df-mo 2259  df-clab 2391  df-cleq 2397  df-clel 2400  df-nfc 2529  df-ne 2569  df-nel 2570  df-ral 2671  df-rex 2672  df-reu 2673  df-rmo 2674  df-rab 2675  df-v 2918  df-sbc 3122  df-csb 3212  df-dif 3283  df-un 3285  df-in 3287  df-ss 3294  df-pss 3296  df-nul 3589  df-if 3700  df-pw 3761  df-sn 3780  df-pr 3781  df-tp 3782  df-op 3783  df-uni 3976  df-iun 4055  df-br 4173  df-opab 4227  df-mpt 4228  df-tr 4263  df-eprel 4454  df-id 4458  df-po 4463  df-so 4464  df-fr 4501  df-we 4503  df-ord 4544  df-on 4545  df-lim 4546  df-suc 4547  df-om 4805  df-xp 4843  df-rel 4844  df-cnv 4845  df-co 4846  df-dm 4847  df-rn 4848  df-res 4849  df-ima 4850  df-iota 5377  df-fun 5415  df-fn 5416  df-f 5417  df-f1 5418  df-fo 5419  df-f1o 5420  df-fv 5421  df-ov 6043  df-oprab 6044  df-mpt2 6045  df-1st 6308  df-2nd 6309  df-riota 6508  df-recs 6592  df-rdg 6627  df-er 6864  df-map 6979  df-en 7069  df-dom 7070  df-sdom 7071  df-sup 7404  df-pnf 9078  df-mnf 9079  df-xr 9080  df-ltxr 9081  df-le 9082  df-sub 9249  df-neg 9250  df-div 9634  df-nn 9957  df-2 10014  df-3 10015  df-4 10016  df-n0 10178  df-z 10239  df-uz 10445  df-rp 10569  df-seq 11279  df-exp 11338  df-cj 11859  df-re 11860  df-im 11861  df-sqr 11995  df-abs 11996  df-grpo 21732  df-gid 21733  df-ablo 21823  df-vc 21978  df-nv 22024  df-va 22027  df-ba 22028  df-sm 22029  df-0v 22030  df-nmcv 22032  df-hnorm 22424  df-hba 22425  df-hvsub 22427  df-nmop 23295  df-cnop 23296  df-lnop 23297
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