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Theorem 0subg 13059
Description: The zero subgroup of an arbitrary group. (Contributed by Stefan O'Rear, 10-Dec-2014.) (Proof shortened by SN, 31-Jan-2025.)
Hypothesis
Ref Expression
0subg.z  |-  .0.  =  ( 0g `  G )
Assertion
Ref Expression
0subg  |-  ( G  e.  Grp  ->  {  .0.  }  e.  (SubGrp `  G
) )

Proof of Theorem 0subg
Dummy variable  a is distinct from all other variables.
StepHypRef Expression
1 grpmnd 12884 . . 3  |-  ( G  e.  Grp  ->  G  e.  Mnd )
2 0subg.z . . . 4  |-  .0.  =  ( 0g `  G )
320subm 12871 . . 3  |-  ( G  e.  Mnd  ->  {  .0.  }  e.  (SubMnd `  G
) )
41, 3syl 14 . 2  |-  ( G  e.  Grp  ->  {  .0.  }  e.  (SubMnd `  G
) )
5 eqid 2177 . . . . 5  |-  ( invg `  G )  =  ( invg `  G )
62, 5grpinvid 12930 . . . 4  |-  ( G  e.  Grp  ->  (
( invg `  G ) `  .0.  )  =  .0.  )
7 eqid 2177 . . . . . . 7  |-  ( Base `  G )  =  (
Base `  G )
87, 2grpidcl 12904 . . . . . 6  |-  ( G  e.  Grp  ->  .0.  e.  ( Base `  G
) )
97, 5grpinvcl 12921 . . . . . 6  |-  ( ( G  e.  Grp  /\  .0.  e.  ( Base `  G
) )  ->  (
( invg `  G ) `  .0.  )  e.  ( Base `  G ) )
108, 9mpdan 421 . . . . 5  |-  ( G  e.  Grp  ->  (
( invg `  G ) `  .0.  )  e.  ( Base `  G ) )
11 elsng 3608 . . . . 5  |-  ( ( ( invg `  G ) `  .0.  )  e.  ( Base `  G )  ->  (
( ( invg `  G ) `  .0.  )  e.  {  .0.  }  <-> 
( ( invg `  G ) `  .0.  )  =  .0.  )
)
1210, 11syl 14 . . . 4  |-  ( G  e.  Grp  ->  (
( ( invg `  G ) `  .0.  )  e.  {  .0.  }  <-> 
( ( invg `  G ) `  .0.  )  =  .0.  )
)
136, 12mpbird 167 . . 3  |-  ( G  e.  Grp  ->  (
( invg `  G ) `  .0.  )  e.  {  .0.  } )
14 fveq2 5516 . . . . . 6  |-  ( a  =  .0.  ->  (
( invg `  G ) `  a
)  =  ( ( invg `  G
) `  .0.  )
)
1514eleq1d 2246 . . . . 5  |-  ( a  =  .0.  ->  (
( ( invg `  G ) `  a
)  e.  {  .0.  }  <-> 
( ( invg `  G ) `  .0.  )  e.  {  .0.  } ) )
1615ralsng 3633 . . . 4  |-  (  .0. 
e.  ( Base `  G
)  ->  ( A. a  e.  {  .0.  }  ( ( invg `  G ) `  a
)  e.  {  .0.  }  <-> 
( ( invg `  G ) `  .0.  )  e.  {  .0.  } ) )
178, 16syl 14 . . 3  |-  ( G  e.  Grp  ->  ( A. a  e.  {  .0.  }  ( ( invg `  G ) `  a
)  e.  {  .0.  }  <-> 
( ( invg `  G ) `  .0.  )  e.  {  .0.  } ) )
1813, 17mpbird 167 . 2  |-  ( G  e.  Grp  ->  A. a  e.  {  .0.  }  (
( invg `  G ) `  a
)  e.  {  .0.  } )
195issubg3 13052 . 2  |-  ( G  e.  Grp  ->  ( {  .0.  }  e.  (SubGrp `  G )  <->  ( {  .0.  }  e.  (SubMnd `  G )  /\  A. a  e.  {  .0.  }  ( ( invg `  G ) `  a
)  e.  {  .0.  } ) ) )
204, 18, 19mpbir2and 944 1  |-  ( G  e.  Grp  ->  {  .0.  }  e.  (SubGrp `  G
) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 105    = wceq 1353    e. wcel 2148   A.wral 2455   {csn 3593   ` cfv 5217   Basecbs 12462   0gc0g 12705   Mndcmnd 12817  SubMndcsubmnd 12850   Grpcgrp 12877   invgcminusg 12878  SubGrpcsubg 13027
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 614  ax-in2 615  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-coll 4119  ax-sep 4122  ax-pow 4175  ax-pr 4210  ax-un 4434  ax-setind 4537  ax-cnex 7902  ax-resscn 7903  ax-1cn 7904  ax-1re 7905  ax-icn 7906  ax-addcl 7907  ax-addrcl 7908  ax-mulcl 7909  ax-addcom 7911  ax-addass 7913  ax-i2m1 7916  ax-0lt1 7917  ax-0id 7919  ax-rnegex 7920  ax-pre-ltirr 7923  ax-pre-ltadd 7927
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-fal 1359  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ne 2348  df-nel 2443  df-ral 2460  df-rex 2461  df-reu 2462  df-rmo 2463  df-rab 2464  df-v 2740  df-sbc 2964  df-csb 3059  df-dif 3132  df-un 3134  df-in 3136  df-ss 3143  df-nul 3424  df-pw 3578  df-sn 3599  df-pr 3600  df-op 3602  df-uni 3811  df-int 3846  df-iun 3889  df-br 4005  df-opab 4066  df-mpt 4067  df-id 4294  df-xp 4633  df-rel 4634  df-cnv 4635  df-co 4636  df-dm 4637  df-rn 4638  df-res 4639  df-ima 4640  df-iota 5179  df-fun 5219  df-fn 5220  df-f 5221  df-f1 5222  df-fo 5223  df-f1o 5224  df-fv 5225  df-riota 5831  df-ov 5878  df-oprab 5879  df-mpo 5880  df-pnf 7994  df-mnf 7995  df-ltxr 7997  df-inn 8920  df-2 8978  df-ndx 12465  df-slot 12466  df-base 12468  df-sets 12469  df-iress 12470  df-plusg 12549  df-0g 12707  df-mgm 12775  df-sgrp 12808  df-mnd 12818  df-submnd 12852  df-grp 12880  df-minusg 12881  df-subg 13030
This theorem is referenced by:  0nsg  13074
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