Theorem subgsub 13046

Description: The subtraction of elements in a subgroup is the same as subtraction in the group. (Contributed by Mario Carneiro, 15-Jun-2015.)

Hypotheses

Ref	Expression
subgsubcl.p	⊢ − = (-g‘𝐺)
subgsub.h	⊢ 𝐻 = (𝐺 ↾s 𝑆)
subgsub.n	⊢ 𝑁 = (-g‘𝐻)

Assertion

Ref	Expression
subgsub	⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → (𝑋 − 𝑌) = (𝑋𝑁𝑌))

Proof of Theorem subgsub

Step	Hyp	Ref	Expression
1		subgsub.h	. . . . . 6 ⊢ 𝐻 = (𝐺 ↾s 𝑆)
2	1	a1i 9	. . . . 5 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → 𝐻 = (𝐺 ↾s 𝑆))
3		eqidd 2178	. . . . 5 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → (+g‘𝐺) = (+g‘𝐺))
4		id 19	. . . . 5 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → 𝑆 ∈ (SubGrp‘𝐺))
5		subgrcl 13039	. . . . 5 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → 𝐺 ∈ Grp)
6	2, 3, 4, 5	ressplusgd 12587	. . . 4 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → (+g‘𝐺) = (+g‘𝐻))
7	6	3ad2ant1 1018	. . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → (+g‘𝐺) = (+g‘𝐻))
8		eqidd 2178	. . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → 𝑋 = 𝑋)
9		eqid 2177	. . . . 5 ⊢ (invg‘𝐺) = (invg‘𝐺)
10		eqid 2177	. . . . 5 ⊢ (invg‘𝐻) = (invg‘𝐻)
11	1, 9, 10	subginv 13041	. . . 4 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑌 ∈ 𝑆) → ((invg‘𝐺)‘𝑌) = ((invg‘𝐻)‘𝑌))
12	11	3adant2 1016	. . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → ((invg‘𝐺)‘𝑌) = ((invg‘𝐻)‘𝑌))
13	7, 8, 12	oveq123d 5896	. 2 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → (𝑋(+g‘𝐺)((invg‘𝐺)‘𝑌)) = (𝑋(+g‘𝐻)((invg‘𝐻)‘𝑌)))
14		eqid 2177	. . . . . 6 ⊢ (Base‘𝐺) = (Base‘𝐺)
15	14	subgss 13034	. . . . 5 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → 𝑆 ⊆ (Base‘𝐺))
16	15	3ad2ant1 1018	. . . 4 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → 𝑆 ⊆ (Base‘𝐺))
17		simp2 998	. . . 4 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → 𝑋 ∈ 𝑆)
18	16, 17	sseldd 3157	. . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → 𝑋 ∈ (Base‘𝐺))
19		simp3 999	. . . 4 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → 𝑌 ∈ 𝑆)
20	16, 19	sseldd 3157	. . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → 𝑌 ∈ (Base‘𝐺))
21		eqid 2177	. . . 4 ⊢ (+g‘𝐺) = (+g‘𝐺)
22		subgsubcl.p	. . . 4 ⊢ − = (-g‘𝐺)
23	14, 21, 9, 22	grpsubval 12919	. . 3 ⊢ ((𝑋 ∈ (Base‘𝐺) ∧ 𝑌 ∈ (Base‘𝐺)) → (𝑋 − 𝑌) = (𝑋(+g‘𝐺)((invg‘𝐺)‘𝑌)))
24	18, 20, 23	syl2anc 411	. 2 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → (𝑋 − 𝑌) = (𝑋(+g‘𝐺)((invg‘𝐺)‘𝑌)))
25	1	subgbas 13038	. . . . 5 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → 𝑆 = (Base‘𝐻))
26	25	3ad2ant1 1018	. . . 4 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → 𝑆 = (Base‘𝐻))
27	17, 26	eleqtrd 2256	. . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → 𝑋 ∈ (Base‘𝐻))
28	19, 26	eleqtrd 2256	. . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → 𝑌 ∈ (Base‘𝐻))
29		eqid 2177	. . . 4 ⊢ (Base‘𝐻) = (Base‘𝐻)
30		eqid 2177	. . . 4 ⊢ (+g‘𝐻) = (+g‘𝐻)
31		subgsub.n	. . . 4 ⊢ 𝑁 = (-g‘𝐻)
32	29, 30, 10, 31	grpsubval 12919	. . 3 ⊢ ((𝑋 ∈ (Base‘𝐻) ∧ 𝑌 ∈ (Base‘𝐻)) → (𝑋𝑁𝑌) = (𝑋(+g‘𝐻)((invg‘𝐻)‘𝑌)))
33	27, 28, 32	syl2anc 411	. 2 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → (𝑋𝑁𝑌) = (𝑋(+g‘𝐻)((invg‘𝐻)‘𝑌)))
34	13, 24, 33	3eqtr4d 2220	1 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → (𝑋 − 𝑌) = (𝑋𝑁𝑌))

Syntax hints:   → wi 4   ∧ w3a 978   = wceq 1353   ∈ wcel 2148   ⊆ wss 3130  ‘cfv 5217  (class class class)co 5875  Basecbs 12462   ↾_s cress 12463  +_gcplusg 12536  Grpcgrp 12877  inv_gcminusg 12878  -_gcsg 12879  SubGrpcsubg 13027

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 614  ax-in2 615  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-coll 4119  ax-sep 4122  ax-pow 4175  ax-pr 4210  ax-un 4434  ax-setind 4537  ax-cnex 7902  ax-resscn 7903  ax-1cn 7904  ax-1re 7905  ax-icn 7906  ax-addcl 7907  ax-addrcl 7908  ax-mulcl 7909  ax-addcom 7911  ax-addass 7913  ax-i2m1 7916  ax-0lt1 7917  ax-0id 7919  ax-rnegex 7920  ax-pre-ltirr 7923  ax-pre-ltadd 7927

This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-fal 1359  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ne 2348  df-nel 2443  df-ral 2460  df-rex 2461  df-reu 2462  df-rmo 2463  df-rab 2464  df-v 2740  df-sbc 2964  df-csb 3059  df-dif 3132  df-un 3134  df-in 3136  df-ss 3143  df-nul 3424  df-pw 3578  df-sn 3599  df-pr 3600  df-op 3602  df-uni 3811  df-int 3846  df-iun 3889  df-br 4005  df-opab 4066  df-mpt 4067  df-id 4294  df-xp 4633  df-rel 4634  df-cnv 4635  df-co 4636  df-dm 4637  df-rn 4638  df-res 4639  df-ima 4640  df-iota 5179  df-fun 5219  df-fn 5220  df-f 5221  df-f1 5222  df-fo 5223  df-f1o 5224  df-fv 5225  df-riota 5831  df-ov 5878  df-oprab 5879  df-mpo 5880  df-1st 6141  df-2nd 6142  df-pnf 7994  df-mnf 7995  df-ltxr 7997  df-inn 8920  df-2 8978  df-ndx 12465  df-slot 12466  df-base 12468  df-sets 12469  df-iress 12470  df-plusg 12549  df-0g 12707  df-mgm 12775  df-sgrp 12808  df-mnd 12818  df-grp 12880  df-minusg 12881  df-sbg 12882  df-subg 13030

This theorem is referenced by:  zringsubgval  13498