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Theorem grplinv 14577
Description: The left inverse of a group element. (Contributed by NM, 24-Aug-2011.) (Revised by Mario Carneiro, 6-Jan-2015.)
Hypotheses
Ref Expression
grpinv.b  |-  B  =  ( Base `  G
)
grpinv.p  |-  .+  =  ( +g  `  G )
grpinv.u  |-  .0.  =  ( 0g `  G )
grpinv.n  |-  N  =  ( inv g `  G )
Assertion
Ref Expression
grplinv  |-  ( ( G  e.  Grp  /\  X  e.  B )  ->  ( ( N `  X )  .+  X
)  =  .0.  )

Proof of Theorem grplinv
Dummy variable  y is distinct from all other variables.
StepHypRef Expression
1 grpinv.b . . . . 5  |-  B  =  ( Base `  G
)
2 grpinv.p . . . . 5  |-  .+  =  ( +g  `  G )
3 grpinv.u . . . . 5  |-  .0.  =  ( 0g `  G )
4 grpinv.n . . . . 5  |-  N  =  ( inv g `  G )
51, 2, 3, 4grpinvval 14570 . . . 4  |-  ( X  e.  B  ->  ( N `  X )  =  ( iota_ y  e.  B ( y  .+  X )  =  .0.  ) )
65adantl 452 . . 3  |-  ( ( G  e.  Grp  /\  X  e.  B )  ->  ( N `  X
)  =  ( iota_ y  e.  B ( y 
.+  X )  =  .0.  ) )
71, 2, 3grpinveu 14565 . . . 4  |-  ( ( G  e.  Grp  /\  X  e.  B )  ->  E! y  e.  B  ( y  .+  X
)  =  .0.  )
8 riotacl2 6360 . . . 4  |-  ( E! y  e.  B  ( y  .+  X )  =  .0.  ->  ( iota_ y  e.  B ( y  .+  X )  =  .0.  )  e. 
{ y  e.  B  |  ( y  .+  X )  =  .0. 
} )
97, 8syl 15 . . 3  |-  ( ( G  e.  Grp  /\  X  e.  B )  ->  ( iota_ y  e.  B
( y  .+  X
)  =  .0.  )  e.  { y  e.  B  |  ( y  .+  X )  =  .0. 
} )
106, 9eqeltrd 2390 . 2  |-  ( ( G  e.  Grp  /\  X  e.  B )  ->  ( N `  X
)  e.  { y  e.  B  |  ( y  .+  X )  =  .0.  } )
11 oveq1 5907 . . . . 5  |-  ( y  =  ( N `  X )  ->  (
y  .+  X )  =  ( ( N `
 X )  .+  X ) )
1211eqeq1d 2324 . . . 4  |-  ( y  =  ( N `  X )  ->  (
( y  .+  X
)  =  .0.  <->  ( ( N `  X )  .+  X )  =  .0.  ) )
1312elrab 2957 . . 3  |-  ( ( N `  X )  e.  { y  e.  B  |  ( y 
.+  X )  =  .0.  }  <->  ( ( N `  X )  e.  B  /\  (
( N `  X
)  .+  X )  =  .0.  ) )
1413simprbi 450 . 2  |-  ( ( N `  X )  e.  { y  e.  B  |  ( y 
.+  X )  =  .0.  }  ->  (
( N `  X
)  .+  X )  =  .0.  )
1510, 14syl 15 1  |-  ( ( G  e.  Grp  /\  X  e.  B )  ->  ( ( N `  X )  .+  X
)  =  .0.  )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 358    = wceq 1633    e. wcel 1701   E!wreu 2579   {crab 2581   ` cfv 5292  (class class class)co 5900   iota_crio 6339   Basecbs 13195   +g cplusg 13255   0gc0g 13449   Grpcgrp 14411   inv gcminusg 14412
This theorem is referenced by:  grprinv  14578  grpinvid1  14579  grpinvid2  14580  isgrpinv  14581  grplcan  14583  grpinvinv  14584  grpsubadd  14602  grplactcnv  14613  mulgdirlem  14640  prdsinvlem  14652  imasgrp  14660  issubg2  14685  isnsg3  14700  nmzsubg  14707  ssnmz  14708  eqger  14716  divsgrp  14721  conjghm  14762  galcan  14807  cntzsubg  14861  lsmmod  15033  lsmdisj2  15040  rngnegr  15430  unitlinv  15508  isdrng2  15571  lmodvneg1  15716  psrlinv  16191  tgpconcompeqg  17846  divstgpopn  17854  grpvlinv  26598  lflnegl  29084  dvhgrp  31115
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1537  ax-5 1548  ax-17 1607  ax-9 1645  ax-8 1666  ax-13 1703  ax-14 1705  ax-6 1720  ax-7 1725  ax-11 1732  ax-12 1897  ax-ext 2297  ax-rep 4168  ax-sep 4178  ax-nul 4186  ax-pow 4225  ax-pr 4251
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1310  df-ex 1533  df-nf 1536  df-sb 1640  df-eu 2180  df-mo 2181  df-clab 2303  df-cleq 2309  df-clel 2312  df-nfc 2441  df-ne 2481  df-ral 2582  df-rex 2583  df-reu 2584  df-rmo 2585  df-rab 2586  df-v 2824  df-sbc 3026  df-csb 3116  df-dif 3189  df-un 3191  df-in 3193  df-ss 3200  df-nul 3490  df-if 3600  df-sn 3680  df-pr 3681  df-op 3683  df-uni 3865  df-iun 3944  df-br 4061  df-opab 4115  df-mpt 4116  df-id 4346  df-xp 4732  df-rel 4733  df-cnv 4734  df-co 4735  df-dm 4736  df-rn 4737  df-res 4738  df-ima 4739  df-iota 5256  df-fun 5294  df-fn 5295  df-f 5296  df-f1 5297  df-fo 5298  df-f1o 5299  df-fv 5300  df-ov 5903  df-riota 6346  df-0g 13453  df-mnd 14416  df-grp 14538  df-minusg 14539
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