MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  isgrpinv Structured version   Unicode version

Theorem isgrpinv 15974
Description: Properties showing that a function  M is the inverse function of a group. (Contributed by NM, 7-Aug-2013.) (Revised by Mario Carneiro, 2-Oct-2015.)
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
isgrpinv  |-  ( G  e.  Grp  ->  (
( M : B --> B  /\  A. x  e.  B  ( ( M `
 x )  .+  x )  =  .0.  )  <->  N  =  M
) )
Distinct variable groups:    x, B    x, G    x,  .0.    x,  .+    x, M    x, N

Proof of Theorem isgrpinv
Dummy variable  e is distinct from all other variables.
StepHypRef Expression
1 grpinv.b . . . . . . . . . 10  |-  B  =  ( Base `  G
)
2 grpinv.p . . . . . . . . . 10  |-  .+  =  ( +g  `  G )
3 grpinv.u . . . . . . . . . 10  |-  .0.  =  ( 0g `  G )
4 grpinv.n . . . . . . . . . 10  |-  N  =  ( invg `  G )
51, 2, 3, 4grpinvval 15963 . . . . . . . . 9  |-  ( x  e.  B  ->  ( N `  x )  =  ( iota_ e  e.  B  ( e  .+  x )  =  .0.  ) )
65ad2antlr 726 . . . . . . . 8  |-  ( ( ( ( G  e. 
Grp  /\  M : B
--> B )  /\  x  e.  B )  /\  (
( M `  x
)  .+  x )  =  .0.  )  ->  ( N `  x )  =  ( iota_ e  e.  B  ( e  .+  x )  =  .0.  ) )
7 simpr 461 . . . . . . . . 9  |-  ( ( ( ( G  e. 
Grp  /\  M : B
--> B )  /\  x  e.  B )  /\  (
( M `  x
)  .+  x )  =  .0.  )  ->  (
( M `  x
)  .+  x )  =  .0.  )
8 simpllr 760 . . . . . . . . . . 11  |-  ( ( ( ( G  e. 
Grp  /\  M : B
--> B )  /\  x  e.  B )  /\  (
( M `  x
)  .+  x )  =  .0.  )  ->  M : B --> B )
9 simplr 755 . . . . . . . . . . 11  |-  ( ( ( ( G  e. 
Grp  /\  M : B
--> B )  /\  x  e.  B )  /\  (
( M `  x
)  .+  x )  =  .0.  )  ->  x  e.  B )
108, 9ffvelrnd 6017 . . . . . . . . . 10  |-  ( ( ( ( G  e. 
Grp  /\  M : B
--> B )  /\  x  e.  B )  /\  (
( M `  x
)  .+  x )  =  .0.  )  ->  ( M `  x )  e.  B )
11 simplll 759 . . . . . . . . . . 11  |-  ( ( ( ( G  e. 
Grp  /\  M : B
--> B )  /\  x  e.  B )  /\  (
( M `  x
)  .+  x )  =  .0.  )  ->  G  e.  Grp )
121, 2, 3grpinveu 15958 . . . . . . . . . . 11  |-  ( ( G  e.  Grp  /\  x  e.  B )  ->  E! e  e.  B  ( e  .+  x
)  =  .0.  )
1311, 9, 12syl2anc 661 . . . . . . . . . 10  |-  ( ( ( ( G  e. 
Grp  /\  M : B
--> B )  /\  x  e.  B )  /\  (
( M `  x
)  .+  x )  =  .0.  )  ->  E! e  e.  B  (
e  .+  x )  =  .0.  )
14 oveq1 6288 . . . . . . . . . . . 12  |-  ( e  =  ( M `  x )  ->  (
e  .+  x )  =  ( ( M `
 x )  .+  x ) )
1514eqeq1d 2445 . . . . . . . . . . 11  |-  ( e  =  ( M `  x )  ->  (
( e  .+  x
)  =  .0.  <->  ( ( M `  x )  .+  x )  =  .0.  ) )
1615riota2 6265 . . . . . . . . . 10  |-  ( ( ( M `  x
)  e.  B  /\  E! e  e.  B  ( e  .+  x
)  =  .0.  )  ->  ( ( ( M `
 x )  .+  x )  =  .0.  <->  (
iota_ e  e.  B  ( e  .+  x
)  =  .0.  )  =  ( M `  x ) ) )
1710, 13, 16syl2anc 661 . . . . . . . . 9  |-  ( ( ( ( G  e. 
Grp  /\  M : B
--> B )  /\  x  e.  B )  /\  (
( M `  x
)  .+  x )  =  .0.  )  ->  (
( ( M `  x )  .+  x
)  =  .0.  <->  ( iota_ e  e.  B  ( e 
.+  x )  =  .0.  )  =  ( M `  x ) ) )
187, 17mpbid 210 . . . . . . . 8  |-  ( ( ( ( G  e. 
Grp  /\  M : B
--> B )  /\  x  e.  B )  /\  (
( M `  x
)  .+  x )  =  .0.  )  ->  ( iota_ e  e.  B  ( e  .+  x )  =  .0.  )  =  ( M `  x
) )
196, 18eqtrd 2484 . . . . . . 7  |-  ( ( ( ( G  e. 
Grp  /\  M : B
--> B )  /\  x  e.  B )  /\  (
( M `  x
)  .+  x )  =  .0.  )  ->  ( N `  x )  =  ( M `  x ) )
2019ex 434 . . . . . 6  |-  ( ( ( G  e.  Grp  /\  M : B --> B )  /\  x  e.  B
)  ->  ( (
( M `  x
)  .+  x )  =  .0.  ->  ( N `  x )  =  ( M `  x ) ) )
2120ralimdva 2851 . . . . 5  |-  ( ( G  e.  Grp  /\  M : B --> B )  ->  ( A. x  e.  B  ( ( M `  x )  .+  x )  =  .0. 
->  A. x  e.  B  ( N `  x )  =  ( M `  x ) ) )
2221impr 619 . . . 4  |-  ( ( G  e.  Grp  /\  ( M : B --> B  /\  A. x  e.  B  ( ( M `  x
)  .+  x )  =  .0.  ) )  ->  A. x  e.  B  ( N `  x )  =  ( M `  x ) )
231, 4grpinvfn 15964 . . . . 5  |-  N  Fn  B
24 ffn 5721 . . . . . 6  |-  ( M : B --> B  ->  M  Fn  B )
2524ad2antrl 727 . . . . 5  |-  ( ( G  e.  Grp  /\  ( M : B --> B  /\  A. x  e.  B  ( ( M `  x
)  .+  x )  =  .0.  ) )  ->  M  Fn  B )
26 eqfnfv 5966 . . . . 5  |-  ( ( N  Fn  B  /\  M  Fn  B )  ->  ( N  =  M  <->  A. x  e.  B  ( N `  x )  =  ( M `  x ) ) )
2723, 25, 26sylancr 663 . . . 4  |-  ( ( G  e.  Grp  /\  ( M : B --> B  /\  A. x  e.  B  ( ( M `  x
)  .+  x )  =  .0.  ) )  -> 
( N  =  M  <->  A. x  e.  B  ( N `  x )  =  ( M `  x ) ) )
2822, 27mpbird 232 . . 3  |-  ( ( G  e.  Grp  /\  ( M : B --> B  /\  A. x  e.  B  ( ( M `  x
)  .+  x )  =  .0.  ) )  ->  N  =  M )
2928ex 434 . 2  |-  ( G  e.  Grp  ->  (
( M : B --> B  /\  A. x  e.  B  ( ( M `
 x )  .+  x )  =  .0.  )  ->  N  =  M ) )
301, 4grpinvf 15968 . . . 4  |-  ( G  e.  Grp  ->  N : B --> B )
311, 2, 3, 4grplinv 15970 . . . . 5  |-  ( ( G  e.  Grp  /\  x  e.  B )  ->  ( ( N `  x )  .+  x
)  =  .0.  )
3231ralrimiva 2857 . . . 4  |-  ( G  e.  Grp  ->  A. x  e.  B  ( ( N `  x )  .+  x )  =  .0.  )
3330, 32jca 532 . . 3  |-  ( G  e.  Grp  ->  ( N : B --> B  /\  A. x  e.  B  ( ( N `  x
)  .+  x )  =  .0.  ) )
34 feq1 5703 . . . 4  |-  ( N  =  M  ->  ( N : B --> B  <->  M : B
--> B ) )
35 fveq1 5855 . . . . . . 7  |-  ( N  =  M  ->  ( N `  x )  =  ( M `  x ) )
3635oveq1d 6296 . . . . . 6  |-  ( N  =  M  ->  (
( N `  x
)  .+  x )  =  ( ( M `
 x )  .+  x ) )
3736eqeq1d 2445 . . . . 5  |-  ( N  =  M  ->  (
( ( N `  x )  .+  x
)  =  .0.  <->  ( ( M `  x )  .+  x )  =  .0.  ) )
3837ralbidv 2882 . . . 4  |-  ( N  =  M  ->  ( A. x  e.  B  ( ( N `  x )  .+  x
)  =  .0.  <->  A. x  e.  B  ( ( M `  x )  .+  x )  =  .0.  ) )
3934, 38anbi12d 710 . . 3  |-  ( N  =  M  ->  (
( N : B --> B  /\  A. x  e.  B  ( ( N `
 x )  .+  x )  =  .0.  )  <->  ( M : B
--> B  /\  A. x  e.  B  ( ( M `  x )  .+  x )  =  .0.  ) ) )
4033, 39syl5ibcom 220 . 2  |-  ( G  e.  Grp  ->  ( N  =  M  ->  ( M : B --> B  /\  A. x  e.  B  ( ( M `  x
)  .+  x )  =  .0.  ) ) )
4129, 40impbid 191 1  |-  ( G  e.  Grp  ->  (
( M : B --> B  /\  A. x  e.  B  ( ( M `
 x )  .+  x )  =  .0.  )  <->  N  =  M
) )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    <-> wb 184    /\ wa 369    = wceq 1383    e. wcel 1804   A.wral 2793   E!wreu 2795    Fn wfn 5573   -->wf 5574   ` cfv 5578   iota_crio 6241  (class class class)co 6281   Basecbs 14509   +g cplusg 14574   0gc0g 14714   Grpcgrp 15927   invgcminusg 15928
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1605  ax-4 1618  ax-5 1691  ax-6 1734  ax-7 1776  ax-8 1806  ax-9 1808  ax-10 1823  ax-11 1828  ax-12 1840  ax-13 1985  ax-ext 2421  ax-rep 4548  ax-sep 4558  ax-nul 4566  ax-pow 4615  ax-pr 4676
This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-3an 976  df-tru 1386  df-ex 1600  df-nf 1604  df-sb 1727  df-eu 2272  df-mo 2273  df-clab 2429  df-cleq 2435  df-clel 2438  df-nfc 2593  df-ne 2640  df-ral 2798  df-rex 2799  df-reu 2800  df-rmo 2801  df-rab 2802  df-v 3097  df-sbc 3314  df-csb 3421  df-dif 3464  df-un 3466  df-in 3468  df-ss 3475  df-nul 3771  df-if 3927  df-sn 4015  df-pr 4017  df-op 4021  df-uni 4235  df-iun 4317  df-br 4438  df-opab 4496  df-mpt 4497  df-id 4785  df-xp 4995  df-rel 4996  df-cnv 4997  df-co 4998  df-dm 4999  df-rn 5000  df-res 5001  df-ima 5002  df-iota 5541  df-fun 5580  df-fn 5581  df-f 5582  df-f1 5583  df-fo 5584  df-f1o 5585  df-fv 5586  df-riota 6242  df-ov 6284  df-0g 14716  df-mgm 15746  df-sgrp 15785  df-mnd 15795  df-grp 15931  df-minusg 15932
This theorem is referenced by:  oppginv  16268
  Copyright terms: Public domain W3C validator