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Theorem subg0 14643
Description: A subgroup of a group must have the same identity as the group. (Contributed by Stefan O'Rear, 27-Nov-2014.) (Revised by Mario Carneiro, 30-Apr-2015.)
Hypotheses
Ref Expression
subg0.h  |-  H  =  ( Gs  S )
subg0.i  |-  .0.  =  ( 0g `  G )
Assertion
Ref Expression
subg0  |-  ( S  e.  (SubGrp `  G
)  ->  .0.  =  ( 0g `  H ) )

Proof of Theorem subg0
StepHypRef Expression
1 subg0.h . . . . 5  |-  H  =  ( Gs  S )
2 eqid 2296 . . . . 5  |-  ( +g  `  G )  =  ( +g  `  G )
31, 2ressplusg 13266 . . . 4  |-  ( S  e.  (SubGrp `  G
)  ->  ( +g  `  G )  =  ( +g  `  H ) )
43oveqd 5891 . . 3  |-  ( S  e.  (SubGrp `  G
)  ->  ( ( 0g `  H ) ( +g  `  G ) ( 0g `  H
) )  =  ( ( 0g `  H
) ( +g  `  H
) ( 0g `  H ) ) )
51subggrp 14640 . . . 4  |-  ( S  e.  (SubGrp `  G
)  ->  H  e.  Grp )
6 eqid 2296 . . . . . 6  |-  ( Base `  H )  =  (
Base `  H )
7 eqid 2296 . . . . . 6  |-  ( 0g
`  H )  =  ( 0g `  H
)
86, 7grpidcl 14526 . . . . 5  |-  ( H  e.  Grp  ->  ( 0g `  H )  e.  ( Base `  H
) )
95, 8syl 15 . . . 4  |-  ( S  e.  (SubGrp `  G
)  ->  ( 0g `  H )  e.  (
Base `  H )
)
10 eqid 2296 . . . . 5  |-  ( +g  `  H )  =  ( +g  `  H )
116, 10, 7grplid 14528 . . . 4  |-  ( ( H  e.  Grp  /\  ( 0g `  H )  e.  ( Base `  H
) )  ->  (
( 0g `  H
) ( +g  `  H
) ( 0g `  H ) )  =  ( 0g `  H
) )
125, 9, 11syl2anc 642 . . 3  |-  ( S  e.  (SubGrp `  G
)  ->  ( ( 0g `  H ) ( +g  `  H ) ( 0g `  H
) )  =  ( 0g `  H ) )
134, 12eqtrd 2328 . 2  |-  ( S  e.  (SubGrp `  G
)  ->  ( ( 0g `  H ) ( +g  `  G ) ( 0g `  H
) )  =  ( 0g `  H ) )
14 subgrcl 14642 . . 3  |-  ( S  e.  (SubGrp `  G
)  ->  G  e.  Grp )
15 eqid 2296 . . . . 5  |-  ( Base `  G )  =  (
Base `  G )
1615subgss 14638 . . . 4  |-  ( S  e.  (SubGrp `  G
)  ->  S  C_  ( Base `  G ) )
171subgbas 14641 . . . . 5  |-  ( S  e.  (SubGrp `  G
)  ->  S  =  ( Base `  H )
)
189, 17eleqtrrd 2373 . . . 4  |-  ( S  e.  (SubGrp `  G
)  ->  ( 0g `  H )  e.  S
)
1916, 18sseldd 3194 . . 3  |-  ( S  e.  (SubGrp `  G
)  ->  ( 0g `  H )  e.  (
Base `  G )
)
20 subg0.i . . . 4  |-  .0.  =  ( 0g `  G )
2115, 2, 20grpid 14533 . . 3  |-  ( ( G  e.  Grp  /\  ( 0g `  H )  e.  ( Base `  G
) )  ->  (
( ( 0g `  H ) ( +g  `  G ) ( 0g
`  H ) )  =  ( 0g `  H )  <->  .0.  =  ( 0g `  H ) ) )
2214, 19, 21syl2anc 642 . 2  |-  ( S  e.  (SubGrp `  G
)  ->  ( (
( 0g `  H
) ( +g  `  G
) ( 0g `  H ) )  =  ( 0g `  H
)  <->  .0.  =  ( 0g `  H ) ) )
2313, 22mpbid 201 1  |-  ( S  e.  (SubGrp `  G
)  ->  .0.  =  ( 0g `  H ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 176    = wceq 1632    e. wcel 1696   ` cfv 5271  (class class class)co 5874   Basecbs 13164   ↾s cress 13165   +g cplusg 13224   0gc0g 13416   Grpcgrp 14378  SubGrpcsubg 14631
This theorem is referenced by:  subginv  14644  subg0cl  14645  subgmulg  14651  subgga  14770  gasubg  14772  sylow2blem2  14948  subgdmdprd  15285  pgpfaclem1  15332  subrg0  15568  abvres  15620  mpl0  16201  gzrngunitlem  16452  prmirred  16464  subgnm  18165  cphsubrglem  18629  qrng0  20786  pwssplit4  27294  frlm0  27325  frlmgsum  27335
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-17 1606  ax-9 1644  ax-8 1661  ax-13 1698  ax-14 1700  ax-6 1715  ax-7 1720  ax-11 1727  ax-12 1878  ax-ext 2277  ax-sep 4157  ax-nul 4165  ax-pow 4204  ax-pr 4230  ax-un 4528  ax-cnex 8809  ax-resscn 8810  ax-1cn 8811  ax-icn 8812  ax-addcl 8813  ax-addrcl 8814  ax-mulcl 8815  ax-mulrcl 8816  ax-mulcom 8817  ax-addass 8818  ax-mulass 8819  ax-distr 8820  ax-i2m1 8821  ax-1ne0 8822  ax-1rid 8823  ax-rnegex 8824  ax-rrecex 8825  ax-cnre 8826  ax-pre-lttri 8827  ax-pre-lttrn 8828  ax-pre-ltadd 8829  ax-pre-mulgt0 8830
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-tru 1310  df-ex 1532  df-nf 1535  df-sb 1639  df-eu 2160  df-mo 2161  df-clab 2283  df-cleq 2289  df-clel 2292  df-nfc 2421  df-ne 2461  df-nel 2462  df-ral 2561  df-rex 2562  df-reu 2563  df-rmo 2564  df-rab 2565  df-v 2803  df-sbc 3005  df-csb 3095  df-dif 3168  df-un 3170  df-in 3172  df-ss 3179  df-pss 3181  df-nul 3469  df-if 3579  df-pw 3640  df-sn 3659  df-pr 3660  df-tp 3661  df-op 3662  df-uni 3844  df-iun 3923  df-br 4040  df-opab 4094  df-mpt 4095  df-tr 4130  df-eprel 4321  df-id 4325  df-po 4330  df-so 4331  df-fr 4368  df-we 4370  df-ord 4411  df-on 4412  df-lim 4413  df-suc 4414  df-om 4673  df-xp 4711  df-rel 4712  df-cnv 4713  df-co 4714  df-dm 4715  df-rn 4716  df-res 4717  df-ima 4718  df-iota 5235  df-fun 5273  df-fn 5274  df-f 5275  df-f1 5276  df-fo 5277  df-f1o 5278  df-fv 5279  df-ov 5877  df-oprab 5878  df-mpt2 5879  df-riota 6320  df-recs 6404  df-rdg 6439  df-er 6676  df-en 6880  df-dom 6881  df-sdom 6882  df-pnf 8885  df-mnf 8886  df-xr 8887  df-ltxr 8888  df-le 8889  df-sub 9055  df-neg 9056  df-nn 9763  df-2 9820  df-ndx 13167  df-slot 13168  df-base 13169  df-sets 13170  df-ress 13171  df-plusg 13237  df-0g 13420  df-mnd 14383  df-grp 14505  df-subg 14634
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