Theorem ablnsg 13920

Description: Every subgroup of an abelian group is normal. (Contributed by Mario Carneiro, 14-Jun-2015.)

Assertion

Ref	Expression
ablnsg	|- ( G e. Abel -> (NrmSGrp ` G ) = (SubGrp ` G ) )

Proof of Theorem ablnsg

Dummy variables x y z are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqid 2231	. . . . . . 7 |- ( Base ` G ) = ( Base ` G )
2		eqid 2231	. . . . . . 7 |- ( +g ` G ) = ( +g ` G )
3	1, 2	ablcom 13889	. . . . . 6 |- ( ( G e. Abel /\ y e. ( Base ` G ) /\ z e. ( Base ` G ) ) -> ( y ( +g ` G ) z ) = ( z ( +g ` G ) y ) )
4	3	3expb 1230	. . . . 5 |- ( ( G e. Abel /\ ( y e. ( Base ` G ) /\ z e. ( Base ` G ) ) ) -> ( y ( +g ` G ) z ) = ( z ( +g ` G ) y ) )
5	4	eleq1d 2300	. . . 4 |- ( ( G e. Abel /\ ( y e. ( Base ` G ) /\ z e. ( Base ` G ) ) ) -> ( ( y ( +g ` G ) z ) e. x <-> ( z ( +g ` G ) y ) e. x ) )
6	5	ralrimivva 2614	. . 3 |- ( G e. Abel -> A. y e. ( Base ` G ) A. z e. ( Base ` G ) ( ( y ( +g ` G ) z ) e. x <-> ( z ( +g ` G ) y ) e. x ) )
7	1, 2	isnsg 13788	. . . 4 |- ( x e. (NrmSGrp ` G ) <-> ( x e. (SubGrp ` G ) /\ A. y e. ( Base ` G ) A. z e. ( Base ` G ) ( ( y ( +g ` G ) z ) e. x <-> ( z ( +g ` G ) y ) e. x ) ) )
8	7	rbaib 928	. . 3 |- ( A. y e. ( Base ` G ) A. z e. ( Base ` G ) ( ( y ( +g ` G ) z ) e. x <-> ( z ( +g ` G ) y ) e. x ) -> ( x e. (NrmSGrp ` G ) <-> x e. (SubGrp ` G ) ) )
9	6, 8	syl 14	. 2 |- ( G e. Abel -> ( x e. (NrmSGrp ` G ) <-> x e. (SubGrp ` G ) ) )
10	9	eqrdv 2229	1 |- ( G e. Abel -> (NrmSGrp ` G ) = (SubGrp ` G ) )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   = wceq 1397   e. wcel 2202   A.wral 2510   ` cfv 5326  (class class class)co 6017   Basecbs 13081   +g cplusg 13159  SubGrpcsubg 13753  NrmSGrpcnsg 13754   Abelcabl 13871

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-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-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-cnex 8122  ax-resscn 8123  ax-1re 8125  ax-addrcl 8128

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  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-ral 2515  df-rex 2516  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  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-fv 5334  df-ov 6020  df-inn 9143  df-2 9201  df-ndx 13084  df-slot 13085  df-base 13087  df-plusg 13172  df-subg 13756  df-nsg 13757  df-cmn 13872  df-abl 13873

This theorem is referenced by:  rngansg  13962  qus2idrng  14538  qus1  14539  qusrhm  14541