Theorem subginv 13982

Description: The inverse of an element in a subgroup is the same as the inverse in the larger group. (Contributed by Mario Carneiro, 2-Dec-2014.)

Hypotheses

Ref	Expression
subg0.h	⊢ 𝐻 = (𝐺 ↾s 𝑆)
subginv.i	⊢ 𝐼 = (invg‘𝐺)
subginv.j	⊢ 𝐽 = (invg‘𝐻)

Assertion

Ref	Expression
subginv	⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆) → (𝐼‘𝑋) = (𝐽‘𝑋))

Proof of Theorem subginv

Step	Hyp	Ref	Expression
1		subg0.h	. . . . 5 ⊢ 𝐻 = (𝐺 ↾s 𝑆)
2	1	subggrp 13978	. . . 4 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → 𝐻 ∈ Grp)
3	1	subgbas 13979	. . . . . 6 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → 𝑆 = (Base‘𝐻))
4	3	eleq2d 2304	. . . . 5 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → (𝑋 ∈ 𝑆 ↔ 𝑋 ∈ (Base‘𝐻)))
5	4	biimpa 296	. . . 4 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆) → 𝑋 ∈ (Base‘𝐻))
6		eqid 2234	. . . . 5 ⊢ (Base‘𝐻) = (Base‘𝐻)
7		eqid 2234	. . . . 5 ⊢ (+g‘𝐻) = (+g‘𝐻)
8		eqid 2234	. . . . 5 ⊢ (0g‘𝐻) = (0g‘𝐻)
9		subginv.j	. . . . 5 ⊢ 𝐽 = (invg‘𝐻)
10	6, 7, 8, 9	grprinv 13848	. . . 4 ⊢ ((𝐻 ∈ Grp ∧ 𝑋 ∈ (Base‘𝐻)) → (𝑋(+g‘𝐻)(𝐽‘𝑋)) = (0g‘𝐻))
11	2, 5, 10	syl2an2r 599	. . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆) → (𝑋(+g‘𝐻)(𝐽‘𝑋)) = (0g‘𝐻))
12	1	a1i 9	. . . . . 6 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → 𝐻 = (𝐺 ↾s 𝑆))
13		eqidd 2235	. . . . . 6 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → (+g‘𝐺) = (+g‘𝐺))
14		id 19	. . . . . 6 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → 𝑆 ∈ (SubGrp‘𝐺))
15		subgrcl 13980	. . . . . 6 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → 𝐺 ∈ Grp)
16	12, 13, 14, 15	ressplusgd 13426	. . . . 5 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → (+g‘𝐺) = (+g‘𝐻))
17	16	adantr 276	. . . 4 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆) → (+g‘𝐺) = (+g‘𝐻))
18	17	oveqd 6075	. . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆) → (𝑋(+g‘𝐺)(𝐽‘𝑋)) = (𝑋(+g‘𝐻)(𝐽‘𝑋)))
19		eqid 2234	. . . . 5 ⊢ (0g‘𝐺) = (0g‘𝐺)
20	1, 19	subg0 13981	. . . 4 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → (0g‘𝐺) = (0g‘𝐻))
21	20	adantr 276	. . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆) → (0g‘𝐺) = (0g‘𝐻))
22	11, 18, 21	3eqtr4d 2277	. 2 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆) → (𝑋(+g‘𝐺)(𝐽‘𝑋)) = (0g‘𝐺))
23	15	adantr 276	. . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆) → 𝐺 ∈ Grp)
24		eqid 2234	. . . . 5 ⊢ (Base‘𝐺) = (Base‘𝐺)
25	24	subgss 13975	. . . 4 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → 𝑆 ⊆ (Base‘𝐺))
26	25	sselda 3242	. . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆) → 𝑋 ∈ (Base‘𝐺))
27	6, 9	grpinvcl 13845	. . . . . . . 8 ⊢ ((𝐻 ∈ Grp ∧ 𝑋 ∈ (Base‘𝐻)) → (𝐽‘𝑋) ∈ (Base‘𝐻))
28	27	ex 115	. . . . . . 7 ⊢ (𝐻 ∈ Grp → (𝑋 ∈ (Base‘𝐻) → (𝐽‘𝑋) ∈ (Base‘𝐻)))
29	2, 28	syl 14	. . . . . 6 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → (𝑋 ∈ (Base‘𝐻) → (𝐽‘𝑋) ∈ (Base‘𝐻)))
30	3	eleq2d 2304	. . . . . 6 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → ((𝐽‘𝑋) ∈ 𝑆 ↔ (𝐽‘𝑋) ∈ (Base‘𝐻)))
31	29, 4, 30	3imtr4d 203	. . . . 5 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → (𝑋 ∈ 𝑆 → (𝐽‘𝑋) ∈ 𝑆))
32	31	imp 124	. . . 4 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆) → (𝐽‘𝑋) ∈ 𝑆)
33	25	sselda 3242	. . . 4 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ (𝐽‘𝑋) ∈ 𝑆) → (𝐽‘𝑋) ∈ (Base‘𝐺))
34	32, 33	syldan 282	. . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆) → (𝐽‘𝑋) ∈ (Base‘𝐺))
35		eqid 2234	. . . 4 ⊢ (+g‘𝐺) = (+g‘𝐺)
36		subginv.i	. . . 4 ⊢ 𝐼 = (invg‘𝐺)
37	24, 35, 19, 36	grpinvid1 13849	. . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ (Base‘𝐺) ∧ (𝐽‘𝑋) ∈ (Base‘𝐺)) → ((𝐼‘𝑋) = (𝐽‘𝑋) ↔ (𝑋(+g‘𝐺)(𝐽‘𝑋)) = (0g‘𝐺)))
38	23, 26, 34, 37	syl3anc 1274	. 2 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆) → ((𝐼‘𝑋) = (𝐽‘𝑋) ↔ (𝑋(+g‘𝐺)(𝐽‘𝑋)) = (0g‘𝐺)))
39	22, 38	mpbird 167	1 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆) → (𝐼‘𝑋) = (𝐽‘𝑋))

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105   = wceq 1398   ∈ wcel 2205  ‘cfv 5357  (class class class)co 6058  Basecbs 13296   ↾_s cress 13297  +_gcplusg 13374  0_gc0g 13553  Grpcgrp 13797  inv_gcminusg 13798  SubGrpcsubg 13968

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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-coll 4230  ax-sep 4233  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664  ax-cnex 8234  ax-resscn 8235  ax-1cn 8236  ax-1re 8237  ax-icn 8238  ax-addcl 8239  ax-addrcl 8240  ax-mulcl 8241  ax-addcom 8243  ax-addass 8245  ax-i2m1 8248  ax-0lt1 8249  ax-0id 8251  ax-rnegex 8252  ax-pre-ltirr 8255  ax-pre-ltadd 8259

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rmo 2530  df-rab 2531  df-v 2817  df-sbc 3046  df-csb 3142  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-nul 3513  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-int 3955  df-iun 3998  df-br 4115  df-opab 4177  df-mpt 4178  df-id 4419  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765  df-res 4766  df-ima 4767  df-iota 5317  df-fun 5359  df-fn 5360  df-f 5361  df-f1 5362  df-fo 5363  df-f1o 5364  df-fv 5365  df-riota 6011  df-ov 6061  df-oprab 6062  df-mpo 6063  df-pnf 8326  df-mnf 8327  df-ltxr 8329  df-inn 9255  df-2 9313  df-ndx 13299  df-slot 13300  df-base 13302  df-sets 13303  df-iress 13304  df-plusg 13387  df-0g 13555  df-mgm 13653  df-sgrp 13699  df-mnd 13714  df-grp 13800  df-minusg 13801  df-subg 13971

This theorem is referenced by:  subginvcl  13984  subgsub  13987  subgmulg  13989  mplnegfi  14972