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Theorem trivsubgsnd 13787
Description: The only subgroup of a trivial group is itself. (Contributed by Rohan Ridenour, 3-Aug-2023.)
Hypotheses
Ref Expression
trivsubgsnd.1  |-  B  =  ( Base `  G
)
trivsubgsnd.2  |-  .0.  =  ( 0g `  G )
trivsubgsnd.3  |-  ( ph  ->  G  e.  Grp )
trivsubgsnd.4  |-  ( ph  ->  B  =  {  .0.  } )
Assertion
Ref Expression
trivsubgsnd  |-  ( ph  ->  (SubGrp `  G )  =  { B } )

Proof of Theorem trivsubgsnd
Dummy variable  x is distinct from all other variables.
StepHypRef Expression
1 trivsubgsnd.1 . . . . . 6  |-  B  =  ( Base `  G
)
2 trivsubgsnd.2 . . . . . 6  |-  .0.  =  ( 0g `  G )
3 trivsubgsnd.3 . . . . . . 7  |-  ( ph  ->  G  e.  Grp )
43adantr 276 . . . . . 6  |-  ( (
ph  /\  x  e.  (SubGrp `  G ) )  ->  G  e.  Grp )
5 trivsubgsnd.4 . . . . . . 7  |-  ( ph  ->  B  =  {  .0.  } )
65adantr 276 . . . . . 6  |-  ( (
ph  /\  x  e.  (SubGrp `  G ) )  ->  B  =  {  .0.  } )
7 simpr 110 . . . . . 6  |-  ( (
ph  /\  x  e.  (SubGrp `  G ) )  ->  x  e.  (SubGrp `  G ) )
81, 2, 4, 6, 7trivsubgd 13786 . . . . 5  |-  ( (
ph  /\  x  e.  (SubGrp `  G ) )  ->  x  =  B )
9 velsn 3686 . . . . 5  |-  ( x  e.  { B }  <->  x  =  B )
108, 9sylibr 134 . . . 4  |-  ( (
ph  /\  x  e.  (SubGrp `  G ) )  ->  x  e.  { B } )
1110ex 115 . . 3  |-  ( ph  ->  ( x  e.  (SubGrp `  G )  ->  x  e.  { B } ) )
1211ssrdv 3233 . 2  |-  ( ph  ->  (SubGrp `  G )  C_ 
{ B } )
131subgid 13761 . . . 4  |-  ( G  e.  Grp  ->  B  e.  (SubGrp `  G )
)
143, 13syl 14 . . 3  |-  ( ph  ->  B  e.  (SubGrp `  G ) )
1514snssd 3818 . 2  |-  ( ph  ->  { B }  C_  (SubGrp `  G ) )
1612, 15eqssd 3244 1  |-  ( ph  ->  (SubGrp `  G )  =  { B } )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1397    e. wcel 2202   {csn 3669   ` cfv 5326   Basecbs 13081   0gc0g 13338   Grpcgrp 13582  SubGrpcsubg 13753
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 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4204  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-cnex 8122  ax-resscn 8123  ax-1cn 8124  ax-1re 8125  ax-icn 8126  ax-addcl 8127  ax-addrcl 8128  ax-mulcl 8129  ax-addcom 8131  ax-addass 8133  ax-i2m1 8136  ax-0lt1 8137  ax-0id 8139  ax-rnegex 8140  ax-pre-ltirr 8143  ax-pre-ltadd 8147
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-reu 2517  df-rmo 2518  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-riota 5970  df-ov 6020  df-oprab 6021  df-mpo 6022  df-pnf 8215  df-mnf 8216  df-ltxr 8218  df-inn 9143  df-2 9201  df-ndx 13084  df-slot 13085  df-base 13087  df-sets 13088  df-iress 13089  df-plusg 13172  df-0g 13340  df-mgm 13438  df-sgrp 13484  df-mnd 13499  df-grp 13585  df-minusg 13586  df-subg 13756
This theorem is referenced by:  trivnsgd  13803
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