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Theorem tgphaus 20343
Description: A topological group is Hausdorff iff the identity subgroup is closed. (Contributed by Mario Carneiro, 18-Sep-2015.)
Hypotheses
Ref Expression
tgphaus.1  |-  .0.  =  ( 0g `  G )
tgphaus.j  |-  J  =  ( TopOpen `  G )
Assertion
Ref Expression
tgphaus  |-  ( G  e.  TopGrp  ->  ( J  e. 
Haus 
<->  {  .0.  }  e.  ( Clsd `  J )
) )

Proof of Theorem tgphaus
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 tgpgrp 20305 . . . . 5  |-  ( G  e.  TopGrp  ->  G  e.  Grp )
2 eqid 2460 . . . . . 6  |-  ( Base `  G )  =  (
Base `  G )
3 tgphaus.1 . . . . . 6  |-  .0.  =  ( 0g `  G )
42, 3grpidcl 15872 . . . . 5  |-  ( G  e.  Grp  ->  .0.  e.  ( Base `  G
) )
51, 4syl 16 . . . 4  |-  ( G  e.  TopGrp  ->  .0.  e.  ( Base `  G ) )
6 tgphaus.j . . . . . 6  |-  J  =  ( TopOpen `  G )
76, 2tgptopon 20309 . . . . 5  |-  ( G  e.  TopGrp  ->  J  e.  (TopOn `  ( Base `  G
) ) )
8 toponuni 19188 . . . . 5  |-  ( J  e.  (TopOn `  ( Base `  G ) )  ->  ( Base `  G
)  =  U. J
)
97, 8syl 16 . . . 4  |-  ( G  e.  TopGrp  ->  ( Base `  G
)  =  U. J
)
105, 9eleqtrd 2550 . . 3  |-  ( G  e.  TopGrp  ->  .0.  e.  U. J
)
11 eqid 2460 . . . . 5  |-  U. J  =  U. J
1211sncld 19631 . . . 4  |-  ( ( J  e.  Haus  /\  .0.  e.  U. J )  ->  {  .0.  }  e.  (
Clsd `  J )
)
1312expcom 435 . . 3  |-  (  .0. 
e.  U. J  ->  ( J  e.  Haus  ->  {  .0.  }  e.  ( Clsd `  J
) ) )
1410, 13syl 16 . 2  |-  ( G  e.  TopGrp  ->  ( J  e. 
Haus  ->  {  .0.  }  e.  ( Clsd `  J
) ) )
15 eqid 2460 . . . . . 6  |-  ( -g `  G )  =  (
-g `  G )
166, 15tgpsubcn 20317 . . . . 5  |-  ( G  e.  TopGrp  ->  ( -g `  G
)  e.  ( ( J  tX  J )  Cn  J ) )
17 cnclima 19528 . . . . . 6  |-  ( ( ( -g `  G
)  e.  ( ( J  tX  J )  Cn  J )  /\  {  .0.  }  e.  (
Clsd `  J )
)  ->  ( `' ( -g `  G )
" {  .0.  }
)  e.  ( Clsd `  ( J  tX  J
) ) )
1817ex 434 . . . . 5  |-  ( (
-g `  G )  e.  ( ( J  tX  J )  Cn  J
)  ->  ( {  .0.  }  e.  ( Clsd `  J )  ->  ( `' ( -g `  G
) " {  .0.  } )  e.  ( Clsd `  ( J  tX  J
) ) ) )
1916, 18syl 16 . . . 4  |-  ( G  e.  TopGrp  ->  ( {  .0.  }  e.  ( Clsd `  J
)  ->  ( `' ( -g `  G )
" {  .0.  }
)  e.  ( Clsd `  ( J  tX  J
) ) ) )
20 cnvimass 5348 . . . . . . . . 9  |-  ( `' ( -g `  G
) " {  .0.  } )  C_  dom  ( -g `  G )
212, 15grpsubf 15911 . . . . . . . . . . 11  |-  ( G  e.  Grp  ->  ( -g `  G ) : ( ( Base `  G
)  X.  ( Base `  G ) ) --> (
Base `  G )
)
221, 21syl 16 . . . . . . . . . 10  |-  ( G  e.  TopGrp  ->  ( -g `  G
) : ( (
Base `  G )  X.  ( Base `  G
) ) --> ( Base `  G ) )
23 fdm 5726 . . . . . . . . . 10  |-  ( (
-g `  G ) : ( ( Base `  G )  X.  ( Base `  G ) ) --> ( Base `  G
)  ->  dom  ( -g `  G )  =  ( ( Base `  G
)  X.  ( Base `  G ) ) )
2422, 23syl 16 . . . . . . . . 9  |-  ( G  e.  TopGrp  ->  dom  ( -g `  G )  =  ( ( Base `  G
)  X.  ( Base `  G ) ) )
2520, 24syl5sseq 3545 . . . . . . . 8  |-  ( G  e.  TopGrp  ->  ( `' (
-g `  G ) " {  .0.  } ) 
C_  ( ( Base `  G )  X.  ( Base `  G ) ) )
26 relxp 5101 . . . . . . . 8  |-  Rel  (
( Base `  G )  X.  ( Base `  G
) )
27 relss 5081 . . . . . . . 8  |-  ( ( `' ( -g `  G
) " {  .0.  } )  C_  ( ( Base `  G )  X.  ( Base `  G
) )  ->  ( Rel  ( ( Base `  G
)  X.  ( Base `  G ) )  ->  Rel  ( `' ( -g `  G ) " {  .0.  } ) ) )
2825, 26, 27mpisyl 18 . . . . . . 7  |-  ( G  e.  TopGrp  ->  Rel  ( `' ( -g `  G )
" {  .0.  }
) )
29 dfrel4v 5449 . . . . . . 7  |-  ( Rel  ( `' ( -g `  G ) " {  .0.  } )  <->  ( `' ( -g `  G )
" {  .0.  }
)  =  { <. x ,  y >.  |  x ( `' ( -g `  G ) " {  .0.  } ) y } )
3028, 29sylib 196 . . . . . 6  |-  ( G  e.  TopGrp  ->  ( `' (
-g `  G ) " {  .0.  } )  =  { <. x ,  y >.  |  x ( `' ( -g `  G ) " {  .0.  } ) y } )
31 ffn 5722 . . . . . . . . . . . 12  |-  ( (
-g `  G ) : ( ( Base `  G )  X.  ( Base `  G ) ) --> ( Base `  G
)  ->  ( -g `  G )  Fn  (
( Base `  G )  X.  ( Base `  G
) ) )
3222, 31syl 16 . . . . . . . . . . 11  |-  ( G  e.  TopGrp  ->  ( -g `  G
)  Fn  ( (
Base `  G )  X.  ( Base `  G
) ) )
33 elpreima 5992 . . . . . . . . . . 11  |-  ( (
-g `  G )  Fn  ( ( Base `  G
)  X.  ( Base `  G ) )  -> 
( <. x ,  y
>.  e.  ( `' (
-g `  G ) " {  .0.  } )  <-> 
( <. x ,  y
>.  e.  ( ( Base `  G )  X.  ( Base `  G ) )  /\  ( ( -g `  G ) `  <. x ,  y >. )  e.  {  .0.  } ) ) )
3432, 33syl 16 . . . . . . . . . 10  |-  ( G  e.  TopGrp  ->  ( <. x ,  y >.  e.  ( `' ( -g `  G
) " {  .0.  } )  <->  ( <. x ,  y >.  e.  ( ( Base `  G
)  X.  ( Base `  G ) )  /\  ( ( -g `  G
) `  <. x ,  y >. )  e.  {  .0.  } ) ) )
35 opelxp 5021 . . . . . . . . . . . 12  |-  ( <.
x ,  y >.  e.  ( ( Base `  G
)  X.  ( Base `  G ) )  <->  ( x  e.  ( Base `  G
)  /\  y  e.  ( Base `  G )
) )
3635anbi1i 695 . . . . . . . . . . 11  |-  ( (
<. x ,  y >.  e.  ( ( Base `  G
)  X.  ( Base `  G ) )  /\  ( ( -g `  G
) `  <. x ,  y >. )  e.  {  .0.  } )  <->  ( (
x  e.  ( Base `  G )  /\  y  e.  ( Base `  G
) )  /\  (
( -g `  G ) `
 <. x ,  y
>. )  e.  {  .0.  } ) )
372, 3, 15grpsubeq0 15918 . . . . . . . . . . . . . . 15  |-  ( ( G  e.  Grp  /\  x  e.  ( Base `  G )  /\  y  e.  ( Base `  G
) )  ->  (
( x ( -g `  G ) y )  =  .0.  <->  x  =  y ) )
38373expb 1192 . . . . . . . . . . . . . 14  |-  ( ( G  e.  Grp  /\  ( x  e.  ( Base `  G )  /\  y  e.  ( Base `  G ) ) )  ->  ( ( x ( -g `  G
) y )  =  .0.  <->  x  =  y
) )
391, 38sylan 471 . . . . . . . . . . . . 13  |-  ( ( G  e.  TopGrp  /\  (
x  e.  ( Base `  G )  /\  y  e.  ( Base `  G
) ) )  -> 
( ( x (
-g `  G )
y )  =  .0.  <->  x  =  y ) )
40 df-ov 6278 . . . . . . . . . . . . . . 15  |-  ( x ( -g `  G
) y )  =  ( ( -g `  G
) `  <. x ,  y >. )
4140eleq1i 2537 . . . . . . . . . . . . . 14  |-  ( ( x ( -g `  G
) y )  e. 
{  .0.  }  <->  ( ( -g `  G ) `  <. x ,  y >.
)  e.  {  .0.  } )
42 ovex 6300 . . . . . . . . . . . . . . 15  |-  ( x ( -g `  G
) y )  e. 
_V
4342elsnc 4044 . . . . . . . . . . . . . 14  |-  ( ( x ( -g `  G
) y )  e. 
{  .0.  }  <->  ( x
( -g `  G ) y )  =  .0.  )
4441, 43bitr3i 251 . . . . . . . . . . . . 13  |-  ( ( ( -g `  G
) `  <. x ,  y >. )  e.  {  .0.  }  <->  ( x (
-g `  G )
y )  =  .0.  )
45 equcom 1738 . . . . . . . . . . . . 13  |-  ( y  =  x  <->  x  =  y )
4639, 44, 453bitr4g 288 . . . . . . . . . . . 12  |-  ( ( G  e.  TopGrp  /\  (
x  e.  ( Base `  G )  /\  y  e.  ( Base `  G
) ) )  -> 
( ( ( -g `  G ) `  <. x ,  y >. )  e.  {  .0.  }  <->  y  =  x ) )
4746pm5.32da 641 . . . . . . . . . . 11  |-  ( G  e.  TopGrp  ->  ( ( ( x  e.  ( Base `  G )  /\  y  e.  ( Base `  G
) )  /\  (
( -g `  G ) `
 <. x ,  y
>. )  e.  {  .0.  } )  <->  ( ( x  e.  ( Base `  G
)  /\  y  e.  ( Base `  G )
)  /\  y  =  x ) ) )
4836, 47syl5bb 257 . . . . . . . . . 10  |-  ( G  e.  TopGrp  ->  ( ( <.
x ,  y >.  e.  ( ( Base `  G
)  X.  ( Base `  G ) )  /\  ( ( -g `  G
) `  <. x ,  y >. )  e.  {  .0.  } )  <->  ( (
x  e.  ( Base `  G )  /\  y  e.  ( Base `  G
) )  /\  y  =  x ) ) )
4934, 48bitrd 253 . . . . . . . . 9  |-  ( G  e.  TopGrp  ->  ( <. x ,  y >.  e.  ( `' ( -g `  G
) " {  .0.  } )  <->  ( ( x  e.  ( Base `  G
)  /\  y  e.  ( Base `  G )
)  /\  y  =  x ) ) )
50 df-br 4441 . . . . . . . . 9  |-  ( x ( `' ( -g `  G ) " {  .0.  } ) y  <->  <. x ,  y >.  e.  ( `' ( -g `  G
) " {  .0.  } ) )
51 eleq1 2532 . . . . . . . . . . . 12  |-  ( y  =  x  ->  (
y  e.  ( Base `  G )  <->  x  e.  ( Base `  G )
) )
5251biimparc 487 . . . . . . . . . . 11  |-  ( ( x  e.  ( Base `  G )  /\  y  =  x )  ->  y  e.  ( Base `  G
) )
5352pm4.71i 632 . . . . . . . . . 10  |-  ( ( x  e.  ( Base `  G )  /\  y  =  x )  <->  ( (
x  e.  ( Base `  G )  /\  y  =  x )  /\  y  e.  ( Base `  G
) ) )
54 an32 796 . . . . . . . . . 10  |-  ( ( ( x  e.  (
Base `  G )  /\  y  e.  ( Base `  G ) )  /\  y  =  x )  <->  ( ( x  e.  ( Base `  G
)  /\  y  =  x )  /\  y  e.  ( Base `  G
) ) )
5553, 54bitr4i 252 . . . . . . . . 9  |-  ( ( x  e.  ( Base `  G )  /\  y  =  x )  <->  ( (
x  e.  ( Base `  G )  /\  y  e.  ( Base `  G
) )  /\  y  =  x ) )
5649, 50, 553bitr4g 288 . . . . . . . 8  |-  ( G  e.  TopGrp  ->  ( x ( `' ( -g `  G
) " {  .0.  } ) y  <->  ( x  e.  ( Base `  G
)  /\  y  =  x ) ) )
5756opabbidv 4503 . . . . . . 7  |-  ( G  e.  TopGrp  ->  { <. x ,  y >.  |  x ( `' ( -g `  G ) " {  .0.  } ) y }  =  { <. x ,  y >.  |  ( x  e.  ( Base `  G )  /\  y  =  x ) } )
58 opabresid 5318 . . . . . . 7  |-  { <. x ,  y >.  |  ( x  e.  ( Base `  G )  /\  y  =  x ) }  =  (  _I  |`  ( Base `  G ) )
5957, 58syl6eq 2517 . . . . . 6  |-  ( G  e.  TopGrp  ->  { <. x ,  y >.  |  x ( `' ( -g `  G ) " {  .0.  } ) y }  =  (  _I  |`  ( Base `  G ) ) )
609reseq2d 5264 . . . . . 6  |-  ( G  e.  TopGrp  ->  (  _I  |`  ( Base `  G ) )  =  (  _I  |`  U. J
) )
6130, 59, 603eqtrd 2505 . . . . 5  |-  ( G  e.  TopGrp  ->  ( `' (
-g `  G ) " {  .0.  } )  =  (  _I  |`  U. J
) )
6261eleq1d 2529 . . . 4  |-  ( G  e.  TopGrp  ->  ( ( `' ( -g `  G
) " {  .0.  } )  e.  ( Clsd `  ( J  tX  J
) )  <->  (  _I  |` 
U. J )  e.  ( Clsd `  ( J  tX  J ) ) ) )
6319, 62sylibd 214 . . 3  |-  ( G  e.  TopGrp  ->  ( {  .0.  }  e.  ( Clsd `  J
)  ->  (  _I  |` 
U. J )  e.  ( Clsd `  ( J  tX  J ) ) ) )
64 topontop 19187 . . . . 5  |-  ( J  e.  (TopOn `  ( Base `  G ) )  ->  J  e.  Top )
657, 64syl 16 . . . 4  |-  ( G  e.  TopGrp  ->  J  e.  Top )
6611hausdiag 19874 . . . . 5  |-  ( J  e.  Haus  <->  ( J  e. 
Top  /\  (  _I  |` 
U. J )  e.  ( Clsd `  ( J  tX  J ) ) ) )
6766baib 898 . . . 4  |-  ( J  e.  Top  ->  ( J  e.  Haus  <->  (  _I  |` 
U. J )  e.  ( Clsd `  ( J  tX  J ) ) ) )
6865, 67syl 16 . . 3  |-  ( G  e.  TopGrp  ->  ( J  e. 
Haus 
<->  (  _I  |`  U. J
)  e.  ( Clsd `  ( J  tX  J
) ) ) )
6963, 68sylibrd 234 . 2  |-  ( G  e.  TopGrp  ->  ( {  .0.  }  e.  ( Clsd `  J
)  ->  J  e.  Haus ) )
7014, 69impbid 191 1  |-  ( G  e.  TopGrp  ->  ( J  e. 
Haus 
<->  {  .0.  }  e.  ( Clsd `  J )
) )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    <-> wb 184    /\ wa 369    = wceq 1374    e. wcel 1762    C_ wss 3469   {csn 4020   <.cop 4026   U.cuni 4238   class class class wbr 4440   {copab 4497    _I cid 4783    X. cxp 4990   `'ccnv 4991   dom cdm 4992    |` cres 4994   "cima 4995   Rel wrel 4997    Fn wfn 5574   -->wf 5575   ` cfv 5579  (class class class)co 6275   Basecbs 14479   TopOpenctopn 14666   0gc0g 14684   Grpcgrp 15716   -gcsg 15719   Topctop 19154  TopOnctopon 19155   Clsdccld 19276    Cn ccn 19484   Hauscha 19568    tX ctx 19789   TopGrpctgp 20298
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1596  ax-4 1607  ax-5 1675  ax-6 1714  ax-7 1734  ax-8 1764  ax-9 1766  ax-10 1781  ax-11 1786  ax-12 1798  ax-13 1961  ax-ext 2438  ax-rep 4551  ax-sep 4561  ax-nul 4569  ax-pow 4618  ax-pr 4679  ax-un 6567
This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-3an 970  df-tru 1377  df-ex 1592  df-nf 1595  df-sb 1707  df-eu 2272  df-mo 2273  df-clab 2446  df-cleq 2452  df-clel 2455  df-nfc 2610  df-ne 2657  df-ral 2812  df-rex 2813  df-reu 2814  df-rmo 2815  df-rab 2816  df-v 3108  df-sbc 3325  df-csb 3429  df-dif 3472  df-un 3474  df-in 3476  df-ss 3483  df-nul 3779  df-if 3933  df-pw 4005  df-sn 4021  df-pr 4023  df-op 4027  df-uni 4239  df-iun 4320  df-br 4441  df-opab 4499  df-mpt 4500  df-id 4788  df-xp 4998  df-rel 4999  df-cnv 5000  df-co 5001  df-dm 5002  df-rn 5003  df-res 5004  df-ima 5005  df-iota 5542  df-fun 5581  df-fn 5582  df-f 5583  df-f1 5584  df-fo 5585  df-f1o 5586  df-fv 5587  df-riota 6236  df-ov 6278  df-oprab 6279  df-mpt2 6280  df-1st 6774  df-2nd 6775  df-map 7412  df-0g 14686  df-topgen 14688  df-mnd 15721  df-plusf 15722  df-grp 15851  df-minusg 15852  df-sbg 15853  df-top 19159  df-bases 19161  df-topon 19162  df-topsp 19163  df-cld 19279  df-cn 19487  df-t1 19574  df-haus 19575  df-tx 19791  df-tmd 20299  df-tgp 20300
This theorem is referenced by:  tgpt1  20344  divstgphaus  20349
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