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Theorem nsgconj 17567
 Description: The conjugation of an element of a normal subgroup is in the subgroup. (Contributed by Mario Carneiro, 4-Feb-2015.)
Hypotheses
Ref Expression
isnsg3.1 𝑋 = (Base‘𝐺)
isnsg3.2 + = (+g𝐺)
isnsg3.3 = (-g𝐺)
Assertion
Ref Expression
nsgconj ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝐴𝑋𝐵𝑆) → ((𝐴 + 𝐵) 𝐴) ∈ 𝑆)

Proof of Theorem nsgconj
StepHypRef Expression
1 nsgsubg 17566 . . . . 5 (𝑆 ∈ (NrmSGrp‘𝐺) → 𝑆 ∈ (SubGrp‘𝐺))
213ad2ant1 1080 . . . 4 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝐴𝑋𝐵𝑆) → 𝑆 ∈ (SubGrp‘𝐺))
3 subgrcl 17539 . . . 4 (𝑆 ∈ (SubGrp‘𝐺) → 𝐺 ∈ Grp)
42, 3syl 17 . . 3 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝐴𝑋𝐵𝑆) → 𝐺 ∈ Grp)
5 simp2 1060 . . 3 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝐴𝑋𝐵𝑆) → 𝐴𝑋)
6 isnsg3.1 . . . . . 6 𝑋 = (Base‘𝐺)
76subgss 17535 . . . . 5 (𝑆 ∈ (SubGrp‘𝐺) → 𝑆𝑋)
82, 7syl 17 . . . 4 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝐴𝑋𝐵𝑆) → 𝑆𝑋)
9 simp3 1061 . . . 4 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝐴𝑋𝐵𝑆) → 𝐵𝑆)
108, 9sseldd 3589 . . 3 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝐴𝑋𝐵𝑆) → 𝐵𝑋)
11 isnsg3.2 . . . 4 + = (+g𝐺)
12 isnsg3.3 . . . 4 = (-g𝐺)
136, 11, 12grpaddsubass 17445 . . 3 ((𝐺 ∈ Grp ∧ (𝐴𝑋𝐵𝑋𝐴𝑋)) → ((𝐴 + 𝐵) 𝐴) = (𝐴 + (𝐵 𝐴)))
144, 5, 10, 5, 13syl13anc 1325 . 2 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝐴𝑋𝐵𝑆) → ((𝐴 + 𝐵) 𝐴) = (𝐴 + (𝐵 𝐴)))
156, 11, 12grpnpcan 17447 . . . . 5 ((𝐺 ∈ Grp ∧ 𝐵𝑋𝐴𝑋) → ((𝐵 𝐴) + 𝐴) = 𝐵)
164, 10, 5, 15syl3anc 1323 . . . 4 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝐴𝑋𝐵𝑆) → ((𝐵 𝐴) + 𝐴) = 𝐵)
1716, 9eqeltrd 2698 . . 3 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝐴𝑋𝐵𝑆) → ((𝐵 𝐴) + 𝐴) ∈ 𝑆)
18 simp1 1059 . . . 4 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝐴𝑋𝐵𝑆) → 𝑆 ∈ (NrmSGrp‘𝐺))
196, 12grpsubcl 17435 . . . . 5 ((𝐺 ∈ Grp ∧ 𝐵𝑋𝐴𝑋) → (𝐵 𝐴) ∈ 𝑋)
204, 10, 5, 19syl3anc 1323 . . . 4 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝐴𝑋𝐵𝑆) → (𝐵 𝐴) ∈ 𝑋)
216, 11nsgbi 17565 . . . 4 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ (𝐵 𝐴) ∈ 𝑋𝐴𝑋) → (((𝐵 𝐴) + 𝐴) ∈ 𝑆 ↔ (𝐴 + (𝐵 𝐴)) ∈ 𝑆))
2218, 20, 5, 21syl3anc 1323 . . 3 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝐴𝑋𝐵𝑆) → (((𝐵 𝐴) + 𝐴) ∈ 𝑆 ↔ (𝐴 + (𝐵 𝐴)) ∈ 𝑆))
2317, 22mpbid 222 . 2 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝐴𝑋𝐵𝑆) → (𝐴 + (𝐵 𝐴)) ∈ 𝑆)
2414, 23eqeltrd 2698 1 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝐴𝑋𝐵𝑆) → ((𝐴 + 𝐵) 𝐴) ∈ 𝑆)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 196   ∧ w3a 1036   = wceq 1480   ∈ wcel 1987   ⊆ wss 3560  ‘cfv 5857  (class class class)co 6615  Basecbs 15800  +gcplusg 15881  Grpcgrp 17362  -gcsg 17364  SubGrpcsubg 17528  NrmSGrpcnsg 17529 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-rep 4741  ax-sep 4751  ax-nul 4759  ax-pow 4813  ax-pr 4877  ax-un 6914 This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-ral 2913  df-rex 2914  df-reu 2915  df-rmo 2916  df-rab 2917  df-v 3192  df-sbc 3423  df-csb 3520  df-dif 3563  df-un 3565  df-in 3567  df-ss 3574  df-nul 3898  df-if 4065  df-pw 4138  df-sn 4156  df-pr 4158  df-op 4162  df-uni 4410  df-iun 4494  df-br 4624  df-opab 4684  df-mpt 4685  df-id 4999  df-xp 5090  df-rel 5091  df-cnv 5092  df-co 5093  df-dm 5094  df-rn 5095  df-res 5096  df-ima 5097  df-iota 5820  df-fun 5859  df-fn 5860  df-f 5861  df-f1 5862  df-fo 5863  df-f1o 5864  df-fv 5865  df-riota 6576  df-ov 6618  df-oprab 6619  df-mpt2 6620  df-1st 7128  df-2nd 7129  df-0g 16042  df-mgm 17182  df-sgrp 17224  df-mnd 17235  df-grp 17365  df-minusg 17366  df-sbg 17367  df-subg 17531  df-nsg 17532 This theorem is referenced by:  isnsg3  17568  ghmnsgima  17624  ghmnsgpreima  17625  clsnsg  21853
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