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Theorem grpinvid1 15586
Description: The inverse of a group element expressed in terms of the identity element. (Contributed by NM, 24-Aug-2011.)
Hypotheses
Ref Expression
grpinv.b  |-  B  =  ( Base `  G
)
grpinv.p  |-  .+  =  ( +g  `  G )
grpinv.u  |-  .0.  =  ( 0g `  G )
grpinv.n  |-  N  =  ( invg `  G )
Assertion
Ref Expression
grpinvid1  |-  ( ( G  e.  Grp  /\  X  e.  B  /\  Y  e.  B )  ->  ( ( N `  X )  =  Y  <-> 
( X  .+  Y
)  =  .0.  )
)

Proof of Theorem grpinvid1
StepHypRef Expression
1 oveq2 6099 . . . 4  |-  ( ( N `  X )  =  Y  ->  ( X  .+  ( N `  X ) )  =  ( X  .+  Y
) )
21adantl 466 . . 3  |-  ( ( ( G  e.  Grp  /\  X  e.  B  /\  Y  e.  B )  /\  ( N `  X
)  =  Y )  ->  ( X  .+  ( N `  X ) )  =  ( X 
.+  Y ) )
3 grpinv.b . . . . . 6  |-  B  =  ( Base `  G
)
4 grpinv.p . . . . . 6  |-  .+  =  ( +g  `  G )
5 grpinv.u . . . . . 6  |-  .0.  =  ( 0g `  G )
6 grpinv.n . . . . . 6  |-  N  =  ( invg `  G )
73, 4, 5, 6grprinv 15585 . . . . 5  |-  ( ( G  e.  Grp  /\  X  e.  B )  ->  ( X  .+  ( N `  X )
)  =  .0.  )
873adant3 1008 . . . 4  |-  ( ( G  e.  Grp  /\  X  e.  B  /\  Y  e.  B )  ->  ( X  .+  ( N `  X )
)  =  .0.  )
98adantr 465 . . 3  |-  ( ( ( G  e.  Grp  /\  X  e.  B  /\  Y  e.  B )  /\  ( N `  X
)  =  Y )  ->  ( X  .+  ( N `  X ) )  =  .0.  )
102, 9eqtr3d 2477 . 2  |-  ( ( ( G  e.  Grp  /\  X  e.  B  /\  Y  e.  B )  /\  ( N `  X
)  =  Y )  ->  ( X  .+  Y )  =  .0.  )
11 oveq2 6099 . . . 4  |-  ( ( X  .+  Y )  =  .0.  ->  (
( N `  X
)  .+  ( X  .+  Y ) )  =  ( ( N `  X )  .+  .0.  ) )
1211adantl 466 . . 3  |-  ( ( ( G  e.  Grp  /\  X  e.  B  /\  Y  e.  B )  /\  ( X  .+  Y
)  =  .0.  )  ->  ( ( N `  X )  .+  ( X  .+  Y ) )  =  ( ( N `
 X )  .+  .0.  ) )
133, 4, 5, 6grplinv 15584 . . . . . . . 8  |-  ( ( G  e.  Grp  /\  X  e.  B )  ->  ( ( N `  X )  .+  X
)  =  .0.  )
1413oveq1d 6106 . . . . . . 7  |-  ( ( G  e.  Grp  /\  X  e.  B )  ->  ( ( ( N `
 X )  .+  X )  .+  Y
)  =  (  .0.  .+  Y ) )
15143adant3 1008 . . . . . 6  |-  ( ( G  e.  Grp  /\  X  e.  B  /\  Y  e.  B )  ->  ( ( ( N `
 X )  .+  X )  .+  Y
)  =  (  .0.  .+  Y ) )
163, 6grpinvcl 15583 . . . . . . . . . 10  |-  ( ( G  e.  Grp  /\  X  e.  B )  ->  ( N `  X
)  e.  B )
1716adantrr 716 . . . . . . . . 9  |-  ( ( G  e.  Grp  /\  ( X  e.  B  /\  Y  e.  B
) )  ->  ( N `  X )  e.  B )
18 simprl 755 . . . . . . . . 9  |-  ( ( G  e.  Grp  /\  ( X  e.  B  /\  Y  e.  B
) )  ->  X  e.  B )
19 simprr 756 . . . . . . . . 9  |-  ( ( G  e.  Grp  /\  ( X  e.  B  /\  Y  e.  B
) )  ->  Y  e.  B )
2017, 18, 193jca 1168 . . . . . . . 8  |-  ( ( G  e.  Grp  /\  ( X  e.  B  /\  Y  e.  B
) )  ->  (
( N `  X
)  e.  B  /\  X  e.  B  /\  Y  e.  B )
)
213, 4grpass 15552 . . . . . . . 8  |-  ( ( G  e.  Grp  /\  ( ( N `  X )  e.  B  /\  X  e.  B  /\  Y  e.  B
) )  ->  (
( ( N `  X )  .+  X
)  .+  Y )  =  ( ( N `
 X )  .+  ( X  .+  Y ) ) )
2220, 21syldan 470 . . . . . . 7  |-  ( ( G  e.  Grp  /\  ( X  e.  B  /\  Y  e.  B
) )  ->  (
( ( N `  X )  .+  X
)  .+  Y )  =  ( ( N `
 X )  .+  ( X  .+  Y ) ) )
23223impb 1183 . . . . . 6  |-  ( ( G  e.  Grp  /\  X  e.  B  /\  Y  e.  B )  ->  ( ( ( N `
 X )  .+  X )  .+  Y
)  =  ( ( N `  X ) 
.+  ( X  .+  Y ) ) )
2415, 23eqtr3d 2477 . . . . 5  |-  ( ( G  e.  Grp  /\  X  e.  B  /\  Y  e.  B )  ->  (  .0.  .+  Y
)  =  ( ( N `  X ) 
.+  ( X  .+  Y ) ) )
253, 4, 5grplid 15568 . . . . . 6  |-  ( ( G  e.  Grp  /\  Y  e.  B )  ->  (  .0.  .+  Y
)  =  Y )
26253adant2 1007 . . . . 5  |-  ( ( G  e.  Grp  /\  X  e.  B  /\  Y  e.  B )  ->  (  .0.  .+  Y
)  =  Y )
2724, 26eqtr3d 2477 . . . 4  |-  ( ( G  e.  Grp  /\  X  e.  B  /\  Y  e.  B )  ->  ( ( N `  X )  .+  ( X  .+  Y ) )  =  Y )
2827adantr 465 . . 3  |-  ( ( ( G  e.  Grp  /\  X  e.  B  /\  Y  e.  B )  /\  ( X  .+  Y
)  =  .0.  )  ->  ( ( N `  X )  .+  ( X  .+  Y ) )  =  Y )
293, 4, 5grprid 15569 . . . . . 6  |-  ( ( G  e.  Grp  /\  ( N `  X )  e.  B )  -> 
( ( N `  X )  .+  .0.  )  =  ( N `  X ) )
3016, 29syldan 470 . . . . 5  |-  ( ( G  e.  Grp  /\  X  e.  B )  ->  ( ( N `  X )  .+  .0.  )  =  ( N `  X ) )
31303adant3 1008 . . . 4  |-  ( ( G  e.  Grp  /\  X  e.  B  /\  Y  e.  B )  ->  ( ( N `  X )  .+  .0.  )  =  ( N `  X ) )
3231adantr 465 . . 3  |-  ( ( ( G  e.  Grp  /\  X  e.  B  /\  Y  e.  B )  /\  ( X  .+  Y
)  =  .0.  )  ->  ( ( N `  X )  .+  .0.  )  =  ( N `  X ) )
3312, 28, 323eqtr3rd 2484 . 2  |-  ( ( ( G  e.  Grp  /\  X  e.  B  /\  Y  e.  B )  /\  ( X  .+  Y
)  =  .0.  )  ->  ( N `  X
)  =  Y )
3410, 33impbida 828 1  |-  ( ( G  e.  Grp  /\  X  e.  B  /\  Y  e.  B )  ->  ( ( N `  X )  =  Y  <-> 
( X  .+  Y
)  =  .0.  )
)
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    <-> wb 184    /\ wa 369    /\ w3a 965    = wceq 1369    e. wcel 1756   ` cfv 5418  (class class class)co 6091   Basecbs 14174   +g cplusg 14238   0gc0g 14378   Grpcgrp 15410   invgcminusg 15411
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 2423  ax-rep 4403  ax-sep 4413  ax-nul 4421  ax-pow 4470  ax-pr 4531
This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-3an 967  df-tru 1372  df-ex 1587  df-nf 1590  df-sb 1701  df-eu 2257  df-mo 2258  df-clab 2430  df-cleq 2436  df-clel 2439  df-nfc 2568  df-ne 2608  df-ral 2720  df-rex 2721  df-reu 2722  df-rmo 2723  df-rab 2724  df-v 2974  df-sbc 3187  df-csb 3289  df-dif 3331  df-un 3333  df-in 3335  df-ss 3342  df-nul 3638  df-if 3792  df-sn 3878  df-pr 3880  df-op 3884  df-uni 4092  df-iun 4173  df-br 4293  df-opab 4351  df-mpt 4352  df-id 4636  df-xp 4846  df-rel 4847  df-cnv 4848  df-co 4849  df-dm 4850  df-rn 4851  df-res 4852  df-ima 4853  df-iota 5381  df-fun 5420  df-fn 5421  df-f 5422  df-f1 5423  df-fo 5424  df-f1o 5425  df-fv 5426  df-riota 6052  df-ov 6094  df-0g 14380  df-mnd 15415  df-grp 15545  df-minusg 15546
This theorem is referenced by:  grpinvid  15589  grpinvcnv  15594  grpinvadd  15604  subginv  15688  divsinv  15740  ghminv  15754  symginv  15907  frgpinv  16261  rngnegl  16685  lmodindp1  17095  lmodvsinv2  17118  cnfldneg  17842  zringinvg  17913  mdetunilem6  18423  invrvald  18482  dchrinv  22600  baerlem3lem1  35352
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