Theorem unitgrp 14507

Description: The group of units is a group under multiplication. (Contributed by Mario Carneiro, 2-Dec-2014.)

Hypotheses

Ref	Expression
unitgrp.1	⊢ 𝑈 = (Unit‘𝑅)
unitgrp.2	⊢ 𝐺 = ((mulGrp‘𝑅) ↾s 𝑈)

Assertion

Ref	Expression
unitgrp	⊢ (𝑅 ∈ Ring → 𝐺 ∈ Grp)

Proof of Theorem unitgrp

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

Step	Hyp	Ref	Expression
1		unitgrp.1	. . . 4 ⊢ 𝑈 = (Unit‘𝑅)
2	1	a1i 9	. . 3 ⊢ (𝑅 ∈ Ring → 𝑈 = (Unit‘𝑅))
3		unitgrp.2	. . . 4 ⊢ 𝐺 = ((mulGrp‘𝑅) ↾s 𝑈)
4	3	a1i 9	. . 3 ⊢ (𝑅 ∈ Ring → 𝐺 = ((mulGrp‘𝑅) ↾s 𝑈))
5		ringsrg 14436	. . 3 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ SRing)
6	2, 4, 5	unitgrpbasd 14506	. 2 ⊢ (𝑅 ∈ Ring → 𝑈 = (Base‘𝐺))
7		eqid 2238	. . . 4 ⊢ (mulGrp‘𝑅) = (mulGrp‘𝑅)
8		eqid 2238	. . . 4 ⊢ (.r‘𝑅) = (.r‘𝑅)
9	7, 8	mgpplusgg 14305	. . 3 ⊢ (𝑅 ∈ Ring → (.r‘𝑅) = (+g‘(mulGrp‘𝑅)))
10		basfn 13463	. . . . 5 ⊢ Base Fn V
11		elex 2833	. . . . 5 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ V)
12		funfvex 5712	. . . . . 6 ⊢ ((Fun Base ∧ 𝑅 ∈ dom Base) → (Base‘𝑅) ∈ V)
13	12	funfni 5483	. . . . 5 ⊢ ((Base Fn V ∧ 𝑅 ∈ V) → (Base‘𝑅) ∈ V)
14	10, 11, 13	sylancr 418	. . . 4 ⊢ (𝑅 ∈ Ring → (Base‘𝑅) ∈ V)
15		eqidd 2239	. . . . 5 ⊢ (𝑅 ∈ Ring → (Base‘𝑅) = (Base‘𝑅))
16	15, 2, 5	unitssd 14500	. . . 4 ⊢ (𝑅 ∈ Ring → 𝑈 ⊆ (Base‘𝑅))
17	14, 16	ssexd 4273	. . 3 ⊢ (𝑅 ∈ Ring → 𝑈 ∈ V)
18	7	mgpex 14307	. . 3 ⊢ (𝑅 ∈ Ring → (mulGrp‘𝑅) ∈ V)
19	4, 9, 17, 18	ressplusgd 13536	. 2 ⊢ (𝑅 ∈ Ring → (.r‘𝑅) = (+g‘𝐺))
20	1, 8	unitmulcl 14504	. 2 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈 ∧ 𝑦 ∈ 𝑈) → (𝑥(.r‘𝑅)𝑦) ∈ 𝑈)
21		eqidd 2239	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ (𝑥 ∈ 𝑈 ∧ 𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈)) → (Base‘𝑅) = (Base‘𝑅))
22	1	a1i 9	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ (𝑥 ∈ 𝑈 ∧ 𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈)) → 𝑈 = (Unit‘𝑅))
23	5	adantr 276	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ (𝑥 ∈ 𝑈 ∧ 𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈)) → 𝑅 ∈ SRing)
24		simpr1 1034	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ (𝑥 ∈ 𝑈 ∧ 𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈)) → 𝑥 ∈ 𝑈)
25	21, 22, 23, 24	unitcld 14499	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ (𝑥 ∈ 𝑈 ∧ 𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈)) → 𝑥 ∈ (Base‘𝑅))
26		simpr2 1035	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ (𝑥 ∈ 𝑈 ∧ 𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈)) → 𝑦 ∈ 𝑈)
27	21, 22, 23, 26	unitcld 14499	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ (𝑥 ∈ 𝑈 ∧ 𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈)) → 𝑦 ∈ (Base‘𝑅))
28		simpr3 1036	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ (𝑥 ∈ 𝑈 ∧ 𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈)) → 𝑧 ∈ 𝑈)
29	21, 22, 23, 28	unitcld 14499	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ (𝑥 ∈ 𝑈 ∧ 𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈)) → 𝑧 ∈ (Base‘𝑅))
30	25, 27, 29	3jca 1208	. . 3 ⊢ ((𝑅 ∈ Ring ∧ (𝑥 ∈ 𝑈 ∧ 𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈)) → (𝑥 ∈ (Base‘𝑅) ∧ 𝑦 ∈ (Base‘𝑅) ∧ 𝑧 ∈ (Base‘𝑅)))
31		eqid 2238	. . . 4 ⊢ (Base‘𝑅) = (Base‘𝑅)
32	31, 8	ringass 14404	. . 3 ⊢ ((𝑅 ∈ Ring ∧ (𝑥 ∈ (Base‘𝑅) ∧ 𝑦 ∈ (Base‘𝑅) ∧ 𝑧 ∈ (Base‘𝑅))) → ((𝑥(.r‘𝑅)𝑦)(.r‘𝑅)𝑧) = (𝑥(.r‘𝑅)(𝑦(.r‘𝑅)𝑧)))
33	30, 32	syldan 282	. 2 ⊢ ((𝑅 ∈ Ring ∧ (𝑥 ∈ 𝑈 ∧ 𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈)) → ((𝑥(.r‘𝑅)𝑦)(.r‘𝑅)𝑧) = (𝑥(.r‘𝑅)(𝑦(.r‘𝑅)𝑧)))
34		eqid 2238	. . 3 ⊢ (1r‘𝑅) = (1r‘𝑅)
35	1, 34	1unit 14498	. 2 ⊢ (𝑅 ∈ Ring → (1r‘𝑅) ∈ 𝑈)
36		eqidd 2239	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → (Base‘𝑅) = (Base‘𝑅))
37	1	a1i 9	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → 𝑈 = (Unit‘𝑅))
38	5	adantr 276	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → 𝑅 ∈ SRing)
39		simpr 110	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → 𝑥 ∈ 𝑈)
40	36, 37, 38, 39	unitcld 14499	. . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → 𝑥 ∈ (Base‘𝑅))
41	31, 8, 34	ringlidm 14412	. . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ (Base‘𝑅)) → ((1r‘𝑅)(.r‘𝑅)𝑥) = 𝑥)
42	40, 41	syldan 282	. 2 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → ((1r‘𝑅)(.r‘𝑅)𝑥) = 𝑥)
43		eqidd 2239	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → (1r‘𝑅) = (1r‘𝑅))
44		eqidd 2239	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → (∥r‘𝑅) = (∥r‘𝑅))
45		eqidd 2239	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → (oppr‘𝑅) = (oppr‘𝑅))
46		eqidd 2239	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → (∥r‘(oppr‘𝑅)) = (∥r‘(oppr‘𝑅)))
47	37, 43, 44, 45, 46, 38	isunitd 14497	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → (𝑥 ∈ 𝑈 ↔ (𝑥(∥r‘𝑅)(1r‘𝑅) ∧ 𝑥(∥r‘(oppr‘𝑅))(1r‘𝑅))))
48	39, 47	mpbid 147	. . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → (𝑥(∥r‘𝑅)(1r‘𝑅) ∧ 𝑥(∥r‘(oppr‘𝑅))(1r‘𝑅)))
49		eqidd 2239	. . . . . 6 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → (.r‘𝑅) = (.r‘𝑅))
50	36, 44, 38, 49, 40	dvdsr2d 14486	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → (𝑥(∥r‘𝑅)(1r‘𝑅) ↔ ∃𝑦 ∈ (Base‘𝑅)(𝑦(.r‘𝑅)𝑥) = (1r‘𝑅)))
51		eqid 2238	. . . . . . . 8 ⊢ (oppr‘𝑅) = (oppr‘𝑅)
52	51, 31	opprbasg 14464	. . . . . . 7 ⊢ (𝑅 ∈ Ring → (Base‘𝑅) = (Base‘(oppr‘𝑅)))
53	52	adantr 276	. . . . . 6 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → (Base‘𝑅) = (Base‘(oppr‘𝑅)))
54	51	opprring 14468	. . . . . . . 8 ⊢ (𝑅 ∈ Ring → (oppr‘𝑅) ∈ Ring)
55		ringsrg 14436	. . . . . . . 8 ⊢ ((oppr‘𝑅) ∈ Ring → (oppr‘𝑅) ∈ SRing)
56	54, 55	syl 14	. . . . . . 7 ⊢ (𝑅 ∈ Ring → (oppr‘𝑅) ∈ SRing)
57	56	adantr 276	. . . . . 6 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → (oppr‘𝑅) ∈ SRing)
58		eqidd 2239	. . . . . 6 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → (.r‘(oppr‘𝑅)) = (.r‘(oppr‘𝑅)))
59	53, 46, 57, 58, 40	dvdsr2d 14486	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → (𝑥(∥r‘(oppr‘𝑅))(1r‘𝑅) ↔ ∃𝑚 ∈ (Base‘𝑅)(𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))
60	50, 59	anbi12d 477	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → ((𝑥(∥r‘𝑅)(1r‘𝑅) ∧ 𝑥(∥r‘(oppr‘𝑅))(1r‘𝑅)) ↔ (∃𝑦 ∈ (Base‘𝑅)(𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ ∃𝑚 ∈ (Base‘𝑅)(𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅))))
61		reeanv 2721	. . . . 5 ⊢ (∃𝑦 ∈ (Base‘𝑅)∃𝑚 ∈ (Base‘𝑅)((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)) ↔ (∃𝑦 ∈ (Base‘𝑅)(𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ ∃𝑚 ∈ (Base‘𝑅)(𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))
62		eqidd 2239	. . . . . . . . . . . 12 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (Base‘𝑅) = (Base‘𝑅))
63		eqidd 2239	. . . . . . . . . . . 12 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (∥r‘𝑅) = (∥r‘𝑅))
64	38	ad2antrr 492	. . . . . . . . . . . 12 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → 𝑅 ∈ SRing)
65		eqidd 2239	. . . . . . . . . . . 12 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (.r‘𝑅) = (.r‘𝑅))
66		simprl 535	. . . . . . . . . . . 12 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → 𝑚 ∈ (Base‘𝑅))
67	40	ad2antrr 492	. . . . . . . . . . . 12 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → 𝑥 ∈ (Base‘𝑅))
68	62, 63, 64, 65, 66, 67	dvdsrmuld 14487	. . . . . . . . . . 11 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → 𝑚(∥r‘𝑅)(𝑥(.r‘𝑅)𝑚))
69		simplll 539	. . . . . . . . . . . . . 14 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → 𝑅 ∈ Ring)
70		simplr 533	. . . . . . . . . . . . . 14 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → 𝑦 ∈ (Base‘𝑅))
71	31, 8	ringass 14404	. . . . . . . . . . . . . 14 ⊢ ((𝑅 ∈ Ring ∧ (𝑦 ∈ (Base‘𝑅) ∧ 𝑥 ∈ (Base‘𝑅) ∧ 𝑚 ∈ (Base‘𝑅))) → ((𝑦(.r‘𝑅)𝑥)(.r‘𝑅)𝑚) = (𝑦(.r‘𝑅)(𝑥(.r‘𝑅)𝑚)))
72	69, 70, 67, 66, 71	syl13anc 1280	. . . . . . . . . . . . 13 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → ((𝑦(.r‘𝑅)𝑥)(.r‘𝑅)𝑚) = (𝑦(.r‘𝑅)(𝑥(.r‘𝑅)𝑚)))
73		simprrl 545	. . . . . . . . . . . . . 14 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (𝑦(.r‘𝑅)𝑥) = (1r‘𝑅))
74	73	oveq1d 6100	. . . . . . . . . . . . 13 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → ((𝑦(.r‘𝑅)𝑥)(.r‘𝑅)𝑚) = ((1r‘𝑅)(.r‘𝑅)𝑚))
75	39	ad2antrr 492	. . . . . . . . . . . . . . . 16 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → 𝑥 ∈ 𝑈)
76		eqid 2238	. . . . . . . . . . . . . . . . 17 ⊢ (.r‘(oppr‘𝑅)) = (.r‘(oppr‘𝑅))
77	31, 8, 51, 76	opprmulg 14460	. . . . . . . . . . . . . . . 16 ⊢ ((𝑅 ∈ Ring ∧ 𝑚 ∈ (Base‘𝑅) ∧ 𝑥 ∈ 𝑈) → (𝑚(.r‘(oppr‘𝑅))𝑥) = (𝑥(.r‘𝑅)𝑚))
78	69, 66, 75, 77	syl3anc 1278	. . . . . . . . . . . . . . 15 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (𝑚(.r‘(oppr‘𝑅))𝑥) = (𝑥(.r‘𝑅)𝑚))
79		simprrr 546	. . . . . . . . . . . . . . 15 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅))
80	78, 79	eqtr3d 2273	. . . . . . . . . . . . . 14 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (𝑥(.r‘𝑅)𝑚) = (1r‘𝑅))
81	80	oveq2d 6101	. . . . . . . . . . . . 13 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (𝑦(.r‘𝑅)(𝑥(.r‘𝑅)𝑚)) = (𝑦(.r‘𝑅)(1r‘𝑅)))
82	72, 74, 81	3eqtr3d 2279	. . . . . . . . . . . 12 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → ((1r‘𝑅)(.r‘𝑅)𝑚) = (𝑦(.r‘𝑅)(1r‘𝑅)))
83	31, 8, 34	ringlidm 14412	. . . . . . . . . . . . 13 ⊢ ((𝑅 ∈ Ring ∧ 𝑚 ∈ (Base‘𝑅)) → ((1r‘𝑅)(.r‘𝑅)𝑚) = 𝑚)
84	69, 66, 83	syl2anc 415	. . . . . . . . . . . 12 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → ((1r‘𝑅)(.r‘𝑅)𝑚) = 𝑚)
85	31, 8, 34	ringridm 14413	. . . . . . . . . . . . 13 ⊢ ((𝑅 ∈ Ring ∧ 𝑦 ∈ (Base‘𝑅)) → (𝑦(.r‘𝑅)(1r‘𝑅)) = 𝑦)
86	69, 70, 85	syl2anc 415	. . . . . . . . . . . 12 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (𝑦(.r‘𝑅)(1r‘𝑅)) = 𝑦)
87	82, 84, 86	3eqtr3d 2279	. . . . . . . . . . 11 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → 𝑚 = 𝑦)
88	68, 87, 80	3brtr3d 4161	. . . . . . . . . 10 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → 𝑦(∥r‘𝑅)(1r‘𝑅))
89	69, 52	syl 14	. . . . . . . . . . . 12 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (Base‘𝑅) = (Base‘(oppr‘𝑅)))
90		eqidd 2239	. . . . . . . . . . . 12 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (∥r‘(oppr‘𝑅)) = (∥r‘(oppr‘𝑅)))
91	69, 56	syl 14	. . . . . . . . . . . 12 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (oppr‘𝑅) ∈ SRing)
92		eqidd 2239	. . . . . . . . . . . 12 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (.r‘(oppr‘𝑅)) = (.r‘(oppr‘𝑅)))
93	89, 90, 91, 92, 70, 67	dvdsrmuld 14487	. . . . . . . . . . 11 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → 𝑦(∥r‘(oppr‘𝑅))(𝑥(.r‘(oppr‘𝑅))𝑦))
94	31, 8, 51, 76	opprmulg 14460	. . . . . . . . . . . . 13 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈 ∧ 𝑦 ∈ (Base‘𝑅)) → (𝑥(.r‘(oppr‘𝑅))𝑦) = (𝑦(.r‘𝑅)𝑥))
95	69, 75, 70, 94	syl3anc 1278	. . . . . . . . . . . 12 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (𝑥(.r‘(oppr‘𝑅))𝑦) = (𝑦(.r‘𝑅)𝑥))
96	95, 73	eqtrd 2271	. . . . . . . . . . 11 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (𝑥(.r‘(oppr‘𝑅))𝑦) = (1r‘𝑅))
97	93, 96	breqtrd 4156	. . . . . . . . . 10 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → 𝑦(∥r‘(oppr‘𝑅))(1r‘𝑅))
98	1	a1i 9	. . . . . . . . . . 11 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → 𝑈 = (Unit‘𝑅))
99		eqidd 2239	. . . . . . . . . . 11 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (1r‘𝑅) = (1r‘𝑅))
100		eqidd 2239	. . . . . . . . . . 11 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (oppr‘𝑅) = (oppr‘𝑅))
101	98, 99, 63, 100, 90, 64	isunitd 14497	. . . . . . . . . 10 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (𝑦 ∈ 𝑈 ↔ (𝑦(∥r‘𝑅)(1r‘𝑅) ∧ 𝑦(∥r‘(oppr‘𝑅))(1r‘𝑅))))
102	88, 97, 101	mpbir2and 957	. . . . . . . . 9 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → 𝑦 ∈ 𝑈)
103	102, 73	jca 306	. . . . . . . 8 ⊢ ((((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) ∧ (𝑚 ∈ (Base‘𝑅) ∧ ((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))) → (𝑦 ∈ 𝑈 ∧ (𝑦(.r‘𝑅)𝑥) = (1r‘𝑅)))
104	103	rexlimdvaa 2669	. . . . . . 7 ⊢ (((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) ∧ 𝑦 ∈ (Base‘𝑅)) → (∃𝑚 ∈ (Base‘𝑅)((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)) → (𝑦 ∈ 𝑈 ∧ (𝑦(.r‘𝑅)𝑥) = (1r‘𝑅))))
105	104	expimpd 363	. . . . . 6 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → ((𝑦 ∈ (Base‘𝑅) ∧ ∃𝑚 ∈ (Base‘𝑅)((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅))) → (𝑦 ∈ 𝑈 ∧ (𝑦(.r‘𝑅)𝑥) = (1r‘𝑅))))
106	105	reximdv2 2649	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → (∃𝑦 ∈ (Base‘𝑅)∃𝑚 ∈ (Base‘𝑅)((𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ (𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)) → ∃𝑦 ∈ 𝑈 (𝑦(.r‘𝑅)𝑥) = (1r‘𝑅)))
107	61, 106	biimtrrid 153	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → ((∃𝑦 ∈ (Base‘𝑅)(𝑦(.r‘𝑅)𝑥) = (1r‘𝑅) ∧ ∃𝑚 ∈ (Base‘𝑅)(𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)) → ∃𝑦 ∈ 𝑈 (𝑦(.r‘𝑅)𝑥) = (1r‘𝑅)))
108	60, 107	sylbid 150	. . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → ((𝑥(∥r‘𝑅)(1r‘𝑅) ∧ 𝑥(∥r‘(oppr‘𝑅))(1r‘𝑅)) → ∃𝑦 ∈ 𝑈 (𝑦(.r‘𝑅)𝑥) = (1r‘𝑅)))
109	48, 108	mpd 13	. 2 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → ∃𝑦 ∈ 𝑈 (𝑦(.r‘𝑅)𝑥) = (1r‘𝑅))
110	6, 19, 20, 33, 35, 42, 109	isgrpde 13880	1 ⊢ (𝑅 ∈ Ring → 𝐺 ∈ Grp)

This proof depends on syntax axioms:   → wi 4   ∧ wa 104   ∧ w3a 1009   = wceq 1402   ∈ wcel 2209  ∃wrex 2529  Vcvv 2821   class class class wbr 4130   Fn wfn 5372  ‘cfv 5377  (class class class)co 6085  Basecbs 13404   ↾_s cress 13405  ._rcmulr 13485  Grpcgrp 13858  mulGrpcmgp 14301  1_rcur 14346  SRingcsrg 14351  Ringcrg 14384  opp_rcoppr 14456  ∥_rcdsr 14476  Unitcui 14477

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4246  ax-sep 4249  ax-nul 4259  ax-pow 4311  ax-pr 4346  ax-un 4578  ax-setind 4684  ax-cnex 8271  ax-resscn 8272  ax-1cn 8273  ax-1re 8274  ax-icn 8275  ax-addcl 8276  ax-addrcl 8277  ax-mulcl 8278  ax-addcom 8280  ax-addass 8282  ax-i2m1 8285  ax-0lt1 8286  ax-0id 8288  ax-rnegex 8289  ax-pre-ltirr 8292  ax-pre-lttrn 8294  ax-pre-ltadd 8296

This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-iun 4014  df-br 4131  df-opab 4193  df-mpt 4194  df-id 4438  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-res 4786  df-ima 4787  df-iota 5337  df-fun 5379  df-fn 5380  df-f 5381  df-f1 5382  df-fo 5383  df-f1o 5384  df-fv 5385  df-riota 6038  df-ov 6088  df-oprab 6089  df-mpo 6090  df-tpos 6516  df-pnf 8363  df-mnf 8364  df-ltxr 8366  df-inn 9308  df-2 9366  df-3 9367  df-ndx 13407  df-slot 13408  df-base 13410  df-sets 13411  df-iress 13412  df-plusg 13497  df-mulr 13498  df-0g 13665  df-mgm 13729  df-sgrp 13770  df-mnd 13783  df-grp 13861  df-minusg 13862  df-cmn 14173  df-abl 14174  df-mgp 14302  df-ur 14347  df-srg 14352  df-ring 14386  df-oppr 14457  df-dvdsr 14479  df-unit 14480

This theorem is used by:  unitabl  14508  unitsubm  14510  invrfvald  14513  unitinvcl  14514  unitinvinv  14515  unitlinv  14517  unitrinv  14518  rdivmuldivd  14535  rhmunitinv  14569  subrgugrp  14632  expghmap  15026