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Theorem nmo0 18246
Description: The operator norm of the zero operator. (Contributed by Mario Carneiro, 20-Oct-2015.)
Hypotheses
Ref Expression
nmo0.1  |-  N  =  ( S normOp T )
nmo0.2  |-  V  =  ( Base `  S
)
nmo0.3  |-  .0.  =  ( 0g `  T )
Assertion
Ref Expression
nmo0  |-  ( ( S  e. NrmGrp  /\  T  e. NrmGrp
)  ->  ( N `  ( V  X.  {  .0.  } ) )  =  0 )

Proof of Theorem nmo0
Dummy variable  x is distinct from all other variables.
StepHypRef Expression
1 nmo0.1 . . 3  |-  N  =  ( S normOp T )
2 nmo0.2 . . 3  |-  V  =  ( Base `  S
)
3 eqid 2285 . . 3  |-  ( norm `  S )  =  (
norm `  S )
4 eqid 2285 . . 3  |-  ( norm `  T )  =  (
norm `  T )
5 eqid 2285 . . 3  |-  ( 0g
`  S )  =  ( 0g `  S
)
6 simpl 443 . . 3  |-  ( ( S  e. NrmGrp  /\  T  e. NrmGrp
)  ->  S  e. NrmGrp )
7 simpr 447 . . 3  |-  ( ( S  e. NrmGrp  /\  T  e. NrmGrp
)  ->  T  e. NrmGrp )
8 ngpgrp 18123 . . . 4  |-  ( S  e. NrmGrp  ->  S  e.  Grp )
9 ngpgrp 18123 . . . 4  |-  ( T  e. NrmGrp  ->  T  e.  Grp )
10 nmo0.3 . . . . 5  |-  .0.  =  ( 0g `  T )
1110, 20ghm 14699 . . . 4  |-  ( ( S  e.  Grp  /\  T  e.  Grp )  ->  ( V  X.  {  .0.  } )  e.  ( S  GrpHom  T ) )
128, 9, 11syl2an 463 . . 3  |-  ( ( S  e. NrmGrp  /\  T  e. NrmGrp
)  ->  ( V  X.  {  .0.  } )  e.  ( S  GrpHom  T ) )
13 0re 8840 . . . 4  |-  0  e.  RR
1413a1i 10 . . 3  |-  ( ( S  e. NrmGrp  /\  T  e. NrmGrp
)  ->  0  e.  RR )
15 0le0 9829 . . . 4  |-  0  <_  0
1615a1i 10 . . 3  |-  ( ( S  e. NrmGrp  /\  T  e. NrmGrp
)  ->  0  <_  0 )
17 fvex 5541 . . . . . . . . 9  |-  ( 0g
`  T )  e. 
_V
1810, 17eqeltri 2355 . . . . . . . 8  |-  .0.  e.  _V
1918fvconst2 5731 . . . . . . 7  |-  ( x  e.  V  ->  (
( V  X.  {  .0.  } ) `  x
)  =  .0.  )
2019ad2antrl 708 . . . . . 6  |-  ( ( ( S  e. NrmGrp  /\  T  e. NrmGrp )  /\  ( x  e.  V  /\  x  =/=  ( 0g `  S
) ) )  -> 
( ( V  X.  {  .0.  } ) `  x )  =  .0.  )
2120fveq2d 5531 . . . . 5  |-  ( ( ( S  e. NrmGrp  /\  T  e. NrmGrp )  /\  ( x  e.  V  /\  x  =/=  ( 0g `  S
) ) )  -> 
( ( norm `  T
) `  ( ( V  X.  {  .0.  }
) `  x )
)  =  ( (
norm `  T ) `  .0.  ) )
224, 10nm0 18150 . . . . . 6  |-  ( T  e. NrmGrp  ->  ( ( norm `  T ) `  .0.  )  =  0 )
2322ad2antlr 707 . . . . 5  |-  ( ( ( S  e. NrmGrp  /\  T  e. NrmGrp )  /\  ( x  e.  V  /\  x  =/=  ( 0g `  S
) ) )  -> 
( ( norm `  T
) `  .0.  )  =  0 )
2421, 23eqtrd 2317 . . . 4  |-  ( ( ( S  e. NrmGrp  /\  T  e. NrmGrp )  /\  ( x  e.  V  /\  x  =/=  ( 0g `  S
) ) )  -> 
( ( norm `  T
) `  ( ( V  X.  {  .0.  }
) `  x )
)  =  0 )
252, 3nmcl 18139 . . . . . . . 8  |-  ( ( S  e. NrmGrp  /\  x  e.  V )  ->  (
( norm `  S ) `  x )  e.  RR )
2625ad2ant2r 727 . . . . . . 7  |-  ( ( ( S  e. NrmGrp  /\  T  e. NrmGrp )  /\  ( x  e.  V  /\  x  =/=  ( 0g `  S
) ) )  -> 
( ( norm `  S
) `  x )  e.  RR )
2726recnd 8863 . . . . . 6  |-  ( ( ( S  e. NrmGrp  /\  T  e. NrmGrp )  /\  ( x  e.  V  /\  x  =/=  ( 0g `  S
) ) )  -> 
( ( norm `  S
) `  x )  e.  CC )
2827mul02d 9012 . . . . 5  |-  ( ( ( S  e. NrmGrp  /\  T  e. NrmGrp )  /\  ( x  e.  V  /\  x  =/=  ( 0g `  S
) ) )  -> 
( 0  x.  (
( norm `  S ) `  x ) )  =  0 )
2915, 28syl5breqr 4061 . . . 4  |-  ( ( ( S  e. NrmGrp  /\  T  e. NrmGrp )  /\  ( x  e.  V  /\  x  =/=  ( 0g `  S
) ) )  -> 
0  <_  ( 0  x.  ( ( norm `  S ) `  x
) ) )
3024, 29eqbrtrd 4045 . . 3  |-  ( ( ( S  e. NrmGrp  /\  T  e. NrmGrp )  /\  ( x  e.  V  /\  x  =/=  ( 0g `  S
) ) )  -> 
( ( norm `  T
) `  ( ( V  X.  {  .0.  }
) `  x )
)  <_  ( 0  x.  ( ( norm `  S ) `  x
) ) )
311, 2, 3, 4, 5, 6, 7, 12, 14, 16, 30nmolb2d 18229 . 2  |-  ( ( S  e. NrmGrp  /\  T  e. NrmGrp
)  ->  ( N `  ( V  X.  {  .0.  } ) )  <_ 
0 )
321nmoge0 18232 . . 3  |-  ( ( S  e. NrmGrp  /\  T  e. NrmGrp  /\  ( V  X.  {  .0.  } )  e.  ( S  GrpHom  T ) )  ->  0  <_  ( N `  ( V  X.  {  .0.  } ) ) )
3312, 32mpd3an3 1278 . 2  |-  ( ( S  e. NrmGrp  /\  T  e. NrmGrp
)  ->  0  <_  ( N `  ( V  X.  {  .0.  }
) ) )
341nmocl 18231 . . . 4  |-  ( ( S  e. NrmGrp  /\  T  e. NrmGrp  /\  ( V  X.  {  .0.  } )  e.  ( S  GrpHom  T ) )  ->  ( N `  ( V  X.  {  .0.  } ) )  e.  RR* )
3512, 34mpd3an3 1278 . . 3  |-  ( ( S  e. NrmGrp  /\  T  e. NrmGrp
)  ->  ( N `  ( V  X.  {  .0.  } ) )  e. 
RR* )
36 0xr 8880 . . 3  |-  0  e.  RR*
37 xrletri3 10488 . . 3  |-  ( ( ( N `  ( V  X.  {  .0.  }
) )  e.  RR*  /\  0  e.  RR* )  ->  ( ( N `  ( V  X.  {  .0.  } ) )  =  0  <-> 
( ( N `  ( V  X.  {  .0.  } ) )  <_  0  /\  0  <_  ( N `
 ( V  X.  {  .0.  } ) ) ) ) )
3835, 36, 37sylancl 643 . 2  |-  ( ( S  e. NrmGrp  /\  T  e. NrmGrp
)  ->  ( ( N `  ( V  X.  {  .0.  } ) )  =  0  <->  (
( N `  ( V  X.  {  .0.  }
) )  <_  0  /\  0  <_  ( N `
 ( V  X.  {  .0.  } ) ) ) ) )
3931, 33, 38mpbir2and 888 1  |-  ( ( S  e. NrmGrp  /\  T  e. NrmGrp
)  ->  ( N `  ( V  X.  {  .0.  } ) )  =  0 )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 176    /\ wa 358    = wceq 1625    e. wcel 1686    =/= wne 2448   _Vcvv 2790   {csn 3642   class class class wbr 4025    X. cxp 4689   ` cfv 5257  (class class class)co 5860   RRcr 8738   0cc0 8739    x. cmul 8744   RR*cxr 8868    <_ cle 8870   Basecbs 13150   0gc0g 13402   Grpcgrp 14364    GrpHom cghm 14682   normcnm 18101  NrmGrpcngp 18102   normOpcnmo 18216
This theorem is referenced by:  nmoeq0  18247  0nghm  18252  idnghm  18254
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1535  ax-5 1546  ax-17 1605  ax-9 1637  ax-8 1645  ax-13 1688  ax-14 1690  ax-6 1705  ax-7 1710  ax-11 1717  ax-12 1868  ax-ext 2266  ax-rep 4133  ax-sep 4143  ax-nul 4151  ax-pow 4190  ax-pr 4216  ax-un 4514  ax-cnex 8795  ax-resscn 8796  ax-1cn 8797  ax-icn 8798  ax-addcl 8799  ax-addrcl 8800  ax-mulcl 8801  ax-mulrcl 8802  ax-mulcom 8803  ax-addass 8804  ax-mulass 8805  ax-distr 8806  ax-i2m1 8807  ax-1ne0 8808  ax-1rid 8809  ax-rnegex 8810  ax-rrecex 8811  ax-cnre 8812  ax-pre-lttri 8813  ax-pre-lttrn 8814  ax-pre-ltadd 8815  ax-pre-mulgt0 8816  ax-pre-sup 8817
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 1531  df-nf 1534  df-sb 1632  df-eu 2149  df-mo 2150  df-clab 2272  df-cleq 2278  df-clel 2281  df-nfc 2410  df-ne 2450  df-nel 2451  df-ral 2550  df-rex 2551  df-reu 2552  df-rmo 2553  df-rab 2554  df-v 2792  df-sbc 2994  df-csb 3084  df-dif 3157  df-un 3159  df-in 3161  df-ss 3168  df-pss 3170  df-nul 3458  df-if 3568  df-pw 3629  df-sn 3648  df-pr 3649  df-tp 3650  df-op 3651  df-uni 3830  df-iun 3909  df-br 4026  df-opab 4080  df-mpt 4081  df-tr 4116  df-eprel 4307  df-id 4311  df-po 4316  df-so 4317  df-fr 4354  df-we 4356  df-ord 4397  df-on 4398  df-lim 4399  df-suc 4400  df-om 4659  df-xp 4697  df-rel 4698  df-cnv 4699  df-co 4700  df-dm 4701  df-rn 4702  df-res 4703  df-ima 4704  df-iota 5221  df-fun 5259  df-fn 5260  df-f 5261  df-f1 5262  df-fo 5263  df-f1o 5264  df-fv 5265  df-ov 5863  df-oprab 5864  df-mpt2 5865  df-1st 6124  df-2nd 6125  df-riota 6306  df-recs 6390  df-rdg 6425  df-er 6662  df-map 6776  df-en 6866  df-dom 6867  df-sdom 6868  df-sup 7196  df-pnf 8871  df-mnf 8872  df-xr 8873  df-ltxr 8874  df-le 8875  df-sub 9041  df-neg 9042  df-div 9426  df-nn 9749  df-2 9806  df-n0 9968  df-z 10027  df-uz 10233  df-q 10319  df-rp 10357  df-xneg 10454  df-xadd 10455  df-xmul 10456  df-ico 10664  df-topgen 13346  df-0g 13406  df-mnd 14369  df-mhm 14417  df-grp 14491  df-ghm 14683  df-xmet 16375  df-met 16376  df-bl 16377  df-mopn 16378  df-top 16638  df-bases 16640  df-topon 16641  df-topsp 16642  df-xms 17887  df-ms 17888  df-nm 18107  df-ngp 18108  df-nmo 18219
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