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Theorem subrgugrp 20337

Description: The units of a subring form a subgroup of the unit group of the original ring. (Contributed by Mario Carneiro, 4-Dec-2014.)

**Hypotheses**
Ref	Expression
subrgugrp.1	⊢ 𝑆 = (𝑅 ↾_s 𝐴)
subrgugrp.2	⊢ 𝑈 = (Unit‘𝑅)
subrgugrp.3	⊢ 𝑉 = (Unit‘𝑆)
subrgugrp.4	⊢ 𝐺 = ((mulGrp‘𝑅) ↾_s 𝑈)

**Assertion**
Ref	Expression
subrgugrp	⊢ (𝐴 ∈ (SubRing‘𝑅) → 𝑉 ∈ (SubGrp‘𝐺))

Proof of Theorem subrgugrp Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		subrgugrp.1	. . 3 ⊢ 𝑆 = (𝑅 ↾_s 𝐴)
2		subrgugrp.2	. . 3 ⊢ 𝑈 = (Unit‘𝑅)
3		subrgugrp.3	. . 3 ⊢ 𝑉 = (Unit‘𝑆)
4	1, 2, 3	subrguss 20333	. 2 ⊢ (𝐴 ∈ (SubRing‘𝑅) → 𝑉 ⊆ 𝑈)
5	1	subrgring 20321	. . 3 ⊢ (𝐴 ∈ (SubRing‘𝑅) → 𝑆 ∈ Ring)
6		eqid 2732	. . . 4 ⊢ (1_r‘𝑆) = (1_r‘𝑆)
7	3, 6	1unit 20187	. . 3 ⊢ (𝑆 ∈ Ring → (1_r‘𝑆) ∈ 𝑉)
8		ne0i 4334	. . 3 ⊢ ((1_r‘𝑆) ∈ 𝑉 → 𝑉 ≠ ∅)
9	5, 7, 8	3syl 18	. 2 ⊢ (𝐴 ∈ (SubRing‘𝑅) → 𝑉 ≠ ∅)
10		eqid 2732	. . . . . . . . . 10 ⊢ (._r‘𝑅) = (._r‘𝑅)
11	1, 10	ressmulr 17251	. . . . . . . . 9 ⊢ (𝐴 ∈ (SubRing‘𝑅) → (._r‘𝑅) = (._r‘𝑆))
12	11	3ad2ant1 1133	. . . . . . . 8 ⊢ ((𝐴 ∈ (SubRing‘𝑅) ∧ 𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉) → (._r‘𝑅) = (._r‘𝑆))
13	12	oveqd 7425	. . . . . . 7 ⊢ ((𝐴 ∈ (SubRing‘𝑅) ∧ 𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉) → (𝑥(._r‘𝑅)𝑦) = (𝑥(._r‘𝑆)𝑦))
14		eqid 2732	. . . . . . . . 9 ⊢ (._r‘𝑆) = (._r‘𝑆)
15	3, 14	unitmulcl 20193	. . . . . . . 8 ⊢ ((𝑆 ∈ Ring ∧ 𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉) → (𝑥(._r‘𝑆)𝑦) ∈ 𝑉)
16	5, 15	syl3an1 1163	. . . . . . 7 ⊢ ((𝐴 ∈ (SubRing‘𝑅) ∧ 𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉) → (𝑥(._r‘𝑆)𝑦) ∈ 𝑉)
17	13, 16	eqeltrd 2833	. . . . . 6 ⊢ ((𝐴 ∈ (SubRing‘𝑅) ∧ 𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉) → (𝑥(._r‘𝑅)𝑦) ∈ 𝑉)
18	17	3expa 1118	. . . . 5 ⊢ (((𝐴 ∈ (SubRing‘𝑅) ∧ 𝑥 ∈ 𝑉) ∧ 𝑦 ∈ 𝑉) → (𝑥(._r‘𝑅)𝑦) ∈ 𝑉)
19	18	ralrimiva 3146	. . . 4 ⊢ ((𝐴 ∈ (SubRing‘𝑅) ∧ 𝑥 ∈ 𝑉) → ∀𝑦 ∈ 𝑉 (𝑥(._r‘𝑅)𝑦) ∈ 𝑉)
20		eqid 2732	. . . . . 6 ⊢ (inv_r‘𝑅) = (inv_r‘𝑅)
21		eqid 2732	. . . . . 6 ⊢ (inv_r‘𝑆) = (inv_r‘𝑆)
22	1, 20, 3, 21	subrginv 20334	. . . . 5 ⊢ ((𝐴 ∈ (SubRing‘𝑅) ∧ 𝑥 ∈ 𝑉) → ((inv_r‘𝑅)‘𝑥) = ((inv_r‘𝑆)‘𝑥))
23	3, 21	unitinvcl 20203	. . . . . 6 ⊢ ((𝑆 ∈ Ring ∧ 𝑥 ∈ 𝑉) → ((inv_r‘𝑆)‘𝑥) ∈ 𝑉)
24	5, 23	sylan 580	. . . . 5 ⊢ ((𝐴 ∈ (SubRing‘𝑅) ∧ 𝑥 ∈ 𝑉) → ((inv_r‘𝑆)‘𝑥) ∈ 𝑉)
25	22, 24	eqeltrd 2833	. . . 4 ⊢ ((𝐴 ∈ (SubRing‘𝑅) ∧ 𝑥 ∈ 𝑉) → ((inv_r‘𝑅)‘𝑥) ∈ 𝑉)
26	19, 25	jca 512	. . 3 ⊢ ((𝐴 ∈ (SubRing‘𝑅) ∧ 𝑥 ∈ 𝑉) → (∀𝑦 ∈ 𝑉 (𝑥(._r‘𝑅)𝑦) ∈ 𝑉 ∧ ((inv_r‘𝑅)‘𝑥) ∈ 𝑉))
27	26	ralrimiva 3146	. 2 ⊢ (𝐴 ∈ (SubRing‘𝑅) → ∀𝑥 ∈ 𝑉 (∀𝑦 ∈ 𝑉 (𝑥(._r‘𝑅)𝑦) ∈ 𝑉 ∧ ((inv_r‘𝑅)‘𝑥) ∈ 𝑉))
28		subrgrcl 20323	. . 3 ⊢ (𝐴 ∈ (SubRing‘𝑅) → 𝑅 ∈ Ring)
29		subrgugrp.4	. . . 4 ⊢ 𝐺 = ((mulGrp‘𝑅) ↾_s 𝑈)
30	2, 29	unitgrp 20196	. . 3 ⊢ (𝑅 ∈ Ring → 𝐺 ∈ Grp)
31	2, 29	unitgrpbas 20195	. . . 4 ⊢ 𝑈 = (Base‘𝐺)
32	2	fvexi 6905	. . . . 5 ⊢ 𝑈 ∈ V
33		eqid 2732	. . . . . . 7 ⊢ (mulGrp‘𝑅) = (mulGrp‘𝑅)
34	33, 10	mgpplusg 19990	. . . . . 6 ⊢ (._r‘𝑅) = (+_g‘(mulGrp‘𝑅))
35	29, 34	ressplusg 17234	. . . . 5 ⊢ (𝑈 ∈ V → (._r‘𝑅) = (+_g‘𝐺))
36	32, 35	ax-mp 5	. . . 4 ⊢ (._r‘𝑅) = (+_g‘𝐺)
37	2, 29, 20	invrfval 20202	. . . 4 ⊢ (inv_r‘𝑅) = (inv_g‘𝐺)
38	31, 36, 37	issubg2 19020	. . 3 ⊢ (𝐺 ∈ Grp → (𝑉 ∈ (SubGrp‘𝐺) ↔ (𝑉 ⊆ 𝑈 ∧ 𝑉 ≠ ∅ ∧ ∀𝑥 ∈ 𝑉 (∀𝑦 ∈ 𝑉 (𝑥(._r‘𝑅)𝑦) ∈ 𝑉 ∧ ((inv_r‘𝑅)‘𝑥) ∈ 𝑉))))
39	28, 30, 38	3syl 18	. 2 ⊢ (𝐴 ∈ (SubRing‘𝑅) → (𝑉 ∈ (SubGrp‘𝐺) ↔ (𝑉 ⊆ 𝑈 ∧ 𝑉 ≠ ∅ ∧ ∀𝑥 ∈ 𝑉 (∀𝑦 ∈ 𝑉 (𝑥(._r‘𝑅)𝑦) ∈ 𝑉 ∧ ((inv_r‘𝑅)‘𝑥) ∈ 𝑉))))
40	4, 9, 27, 39	mpbir3and 1342	1 ⊢ (𝐴 ∈ (SubRing‘𝑅) → 𝑉 ∈ (SubGrp‘𝐺))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ≠ wne 2940 ∀wral 3061 Vcvv 3474 ⊆ wss 3948 ∅c0 4322 ‘cfv 6543 (class class class)co 7408 ↾_s cress 17172 +_gcplusg 17196 ._rcmulr 17197 Grpcgrp 18818 SubGrpcsubg 18999 mulGrpcmgp 19986 1_rcur 20003 Ringcrg 20055 Unitcui 20168 inv_rcinvr 20200 SubRingcsubrg 20314

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7724 ax-cnex 11165 ax-resscn 11166 ax-1cn 11167 ax-icn 11168 ax-addcl 11169 ax-addrcl 11170 ax-mulcl 11171 ax-mulrcl 11172 ax-mulcom 11173 ax-addass 11174 ax-mulass 11175 ax-distr 11176 ax-i2m1 11177 ax-1ne0 11178 ax-1rid 11179 ax-rnegex 11180 ax-rrecex 11181 ax-cnre 11182 ax-pre-lttri 11183 ax-pre-lttrn 11184 ax-pre-ltadd 11185 ax-pre-mulgt0 11186

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7364 df-ov 7411 df-oprab 7412 df-mpo 7413 df-om 7855 df-2nd 7975 df-tpos 8210 df-frecs 8265 df-wrecs 8296 df-recs 8370 df-rdg 8409 df-er 8702 df-en 8939 df-dom 8940 df-sdom 8941 df-pnf 11249 df-mnf 11250 df-xr 11251 df-ltxr 11252 df-le 11253 df-sub 11445 df-neg 11446 df-nn 12212 df-2 12274 df-3 12275 df-sets 17096 df-slot 17114 df-ndx 17126 df-base 17144 df-ress 17173 df-plusg 17209 df-mulr 17210 df-0g 17386 df-mgm 18560 df-sgrp 18609 df-mnd 18625 df-grp 18821 df-minusg 18822 df-subg 19002 df-mgp 19987 df-ur 20004 df-ring 20057 df-oppr 20149 df-dvdsr 20170 df-unit 20171 df-invr 20201 df-subrg 20316

This theorem is referenced by: (None)

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