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Theorem subgcl 13716
Description: A subgroup is closed under group operation. (Contributed by Mario Carneiro, 2-Dec-2014.)
Hypothesis
Ref Expression
subgcl.p  |-  .+  =  ( +g  `  G )
Assertion
Ref Expression
subgcl  |-  ( ( S  e.  (SubGrp `  G )  /\  X  e.  S  /\  Y  e.  S )  ->  ( X  .+  Y )  e.  S )

Proof of Theorem subgcl
StepHypRef Expression
1 eqid 2229 . . 3  |-  ( Base `  ( Gs  S ) )  =  ( Base `  ( Gs  S ) )
2 eqid 2229 . . 3  |-  ( +g  `  ( Gs  S ) )  =  ( +g  `  ( Gs  S ) )
3 eqid 2229 . . . . 5  |-  ( Gs  S )  =  ( Gs  S )
43subggrp 13709 . . . 4  |-  ( S  e.  (SubGrp `  G
)  ->  ( Gs  S
)  e.  Grp )
543ad2ant1 1042 . . 3  |-  ( ( S  e.  (SubGrp `  G )  /\  X  e.  S  /\  Y  e.  S )  ->  ( Gs  S )  e.  Grp )
6 simp2 1022 . . . 4  |-  ( ( S  e.  (SubGrp `  G )  /\  X  e.  S  /\  Y  e.  S )  ->  X  e.  S )
73subgbas 13710 . . . . 5  |-  ( S  e.  (SubGrp `  G
)  ->  S  =  ( Base `  ( Gs  S
) ) )
873ad2ant1 1042 . . . 4  |-  ( ( S  e.  (SubGrp `  G )  /\  X  e.  S  /\  Y  e.  S )  ->  S  =  ( Base `  ( Gs  S ) ) )
96, 8eleqtrd 2308 . . 3  |-  ( ( S  e.  (SubGrp `  G )  /\  X  e.  S  /\  Y  e.  S )  ->  X  e.  ( Base `  ( Gs  S ) ) )
10 simp3 1023 . . . 4  |-  ( ( S  e.  (SubGrp `  G )  /\  X  e.  S  /\  Y  e.  S )  ->  Y  e.  S )
1110, 8eleqtrd 2308 . . 3  |-  ( ( S  e.  (SubGrp `  G )  /\  X  e.  S  /\  Y  e.  S )  ->  Y  e.  ( Base `  ( Gs  S ) ) )
121, 2, 5, 9, 11grpcld 13542 . 2  |-  ( ( S  e.  (SubGrp `  G )  /\  X  e.  S  /\  Y  e.  S )  ->  ( X ( +g  `  ( Gs  S ) ) Y )  e.  ( Base `  ( Gs  S ) ) )
13 eqidd 2230 . . . . 5  |-  ( S  e.  (SubGrp `  G
)  ->  ( Gs  S
)  =  ( Gs  S ) )
14 subgcl.p . . . . . 6  |-  .+  =  ( +g  `  G )
1514a1i 9 . . . . 5  |-  ( S  e.  (SubGrp `  G
)  ->  .+  =  ( +g  `  G ) )
16 id 19 . . . . 5  |-  ( S  e.  (SubGrp `  G
)  ->  S  e.  (SubGrp `  G ) )
17 subgrcl 13711 . . . . 5  |-  ( S  e.  (SubGrp `  G
)  ->  G  e.  Grp )
1813, 15, 16, 17ressplusgd 13157 . . . 4  |-  ( S  e.  (SubGrp `  G
)  ->  .+  =  ( +g  `  ( Gs  S ) ) )
19183ad2ant1 1042 . . 3  |-  ( ( S  e.  (SubGrp `  G )  /\  X  e.  S  /\  Y  e.  S )  ->  .+  =  ( +g  `  ( Gs  S ) ) )
2019oveqd 6017 . 2  |-  ( ( S  e.  (SubGrp `  G )  /\  X  e.  S  /\  Y  e.  S )  ->  ( X  .+  Y )  =  ( X ( +g  `  ( Gs  S ) ) Y ) )
2112, 20, 83eltr4d 2313 1  |-  ( ( S  e.  (SubGrp `  G )  /\  X  e.  S  /\  Y  e.  S )  ->  ( X  .+  Y )  e.  S )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ w3a 1002    = wceq 1395    e. wcel 2200   ` cfv 5317  (class class class)co 6000   Basecbs 13027   ↾s cress 13028   +g cplusg 13105   Grpcgrp 13528  SubGrpcsubg 13699
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 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4201  ax-pow 4257  ax-pr 4292  ax-un 4523  ax-setind 4628  ax-cnex 8086  ax-resscn 8087  ax-1cn 8088  ax-1re 8089  ax-icn 8090  ax-addcl 8091  ax-addrcl 8092  ax-mulcl 8093  ax-addcom 8095  ax-addass 8097  ax-i2m1 8100  ax-0lt1 8101  ax-0id 8103  ax-rnegex 8104  ax-pre-ltirr 8107  ax-pre-ltadd 8111
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-nel 2496  df-ral 2513  df-rex 2514  df-rab 2517  df-v 2801  df-sbc 3029  df-csb 3125  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-nul 3492  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3888  df-int 3923  df-br 4083  df-opab 4145  df-mpt 4146  df-id 4383  df-xp 4724  df-rel 4725  df-cnv 4726  df-co 4727  df-dm 4728  df-rn 4729  df-res 4730  df-ima 4731  df-iota 5277  df-fun 5319  df-fn 5320  df-fv 5325  df-ov 6003  df-oprab 6004  df-mpo 6005  df-pnf 8179  df-mnf 8180  df-ltxr 8182  df-inn 9107  df-2 9165  df-ndx 13030  df-slot 13031  df-base 13033  df-sets 13034  df-iress 13035  df-plusg 13118  df-mgm 13384  df-sgrp 13430  df-mnd 13445  df-grp 13531  df-subg 13702
This theorem is referenced by:  subgsubcl  13717  subgmulgcl  13719  issubg2m  13721  subgintm  13730  ssnmz  13743  eqger  13756  eqgcpbl  13760  resghm  13792  ghmpreima  13798  subrngacl  14166  subrgacl  14190  islss4  14340  dflidl2rng  14439
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