Theorem unitgrp 19411

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

Hypotheses

Ref	Expression
unitmulcl.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		unitmulcl.1	. . . 4 ⊢ 𝑈 = (Unit‘𝑅)
2		unitgrp.2	. . . 4 ⊢ 𝐺 = ((mulGrp‘𝑅) ↾s 𝑈)
3	1, 2	unitgrpbas 19410	. . 3 ⊢ 𝑈 = (Base‘𝐺)
4	3	a1i 11	. 2 ⊢ (𝑅 ∈ Ring → 𝑈 = (Base‘𝐺))
5	1	fvexi 6678	. . 3 ⊢ 𝑈 ∈ V
6		eqid 2821	. . . . 5 ⊢ (mulGrp‘𝑅) = (mulGrp‘𝑅)
7		eqid 2821	. . . . 5 ⊢ (.r‘𝑅) = (.r‘𝑅)
8	6, 7	mgpplusg 19237	. . . 4 ⊢ (.r‘𝑅) = (+g‘(mulGrp‘𝑅))
9	2, 8	ressplusg 16606	. . 3 ⊢ (𝑈 ∈ V → (.r‘𝑅) = (+g‘𝐺))
10	5, 9	mp1i 13	. 2 ⊢ (𝑅 ∈ Ring → (.r‘𝑅) = (+g‘𝐺))
11	1, 7	unitmulcl 19408	. 2 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈 ∧ 𝑦 ∈ 𝑈) → (𝑥(.r‘𝑅)𝑦) ∈ 𝑈)
12		eqid 2821	. . . . 5 ⊢ (Base‘𝑅) = (Base‘𝑅)
13	12, 1	unitcl 19403	. . . 4 ⊢ (𝑥 ∈ 𝑈 → 𝑥 ∈ (Base‘𝑅))
14	12, 1	unitcl 19403	. . . 4 ⊢ (𝑦 ∈ 𝑈 → 𝑦 ∈ (Base‘𝑅))
15	12, 1	unitcl 19403	. . . 4 ⊢ (𝑧 ∈ 𝑈 → 𝑧 ∈ (Base‘𝑅))
16	13, 14, 15	3anim123i 1147	. . 3 ⊢ ((𝑥 ∈ 𝑈 ∧ 𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) → (𝑥 ∈ (Base‘𝑅) ∧ 𝑦 ∈ (Base‘𝑅) ∧ 𝑧 ∈ (Base‘𝑅)))
17	12, 7	ringass 19308	. . 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)))
18	16, 17	sylan2 594	. 2 ⊢ ((𝑅 ∈ Ring ∧ (𝑥 ∈ 𝑈 ∧ 𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈)) → ((𝑥(.r‘𝑅)𝑦)(.r‘𝑅)𝑧) = (𝑥(.r‘𝑅)(𝑦(.r‘𝑅)𝑧)))
19		eqid 2821	. . 3 ⊢ (1r‘𝑅) = (1r‘𝑅)
20	1, 19	1unit 19402	. 2 ⊢ (𝑅 ∈ Ring → (1r‘𝑅) ∈ 𝑈)
21	12, 7, 19	ringlidm 19315	. . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ (Base‘𝑅)) → ((1r‘𝑅)(.r‘𝑅)𝑥) = 𝑥)
22	13, 21	sylan2 594	. 2 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → ((1r‘𝑅)(.r‘𝑅)𝑥) = 𝑥)
23		simpr 487	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → 𝑥 ∈ 𝑈)
24		eqid 2821	. . . . 5 ⊢ (∥r‘𝑅) = (∥r‘𝑅)
25		eqid 2821	. . . . 5 ⊢ (oppr‘𝑅) = (oppr‘𝑅)
26		eqid 2821	. . . . 5 ⊢ (∥r‘(oppr‘𝑅)) = (∥r‘(oppr‘𝑅))
27	1, 19, 24, 25, 26	isunit 19401	. . . 4 ⊢ (𝑥 ∈ 𝑈 ↔ (𝑥(∥r‘𝑅)(1r‘𝑅) ∧ 𝑥(∥r‘(oppr‘𝑅))(1r‘𝑅)))
28	23, 27	sylib 220	. . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → (𝑥(∥r‘𝑅)(1r‘𝑅) ∧ 𝑥(∥r‘(oppr‘𝑅))(1r‘𝑅)))
29	13	adantl 484	. . . . . 6 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → 𝑥 ∈ (Base‘𝑅))
30	12, 24, 7	dvdsr2 19391	. . . . . 6 ⊢ (𝑥 ∈ (Base‘𝑅) → (𝑥(∥r‘𝑅)(1r‘𝑅) ↔ ∃𝑦 ∈ (Base‘𝑅)(𝑦(.r‘𝑅)𝑥) = (1r‘𝑅)))
31	29, 30	syl 17	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → (𝑥(∥r‘𝑅)(1r‘𝑅) ↔ ∃𝑦 ∈ (Base‘𝑅)(𝑦(.r‘𝑅)𝑥) = (1r‘𝑅)))
32	25, 12	opprbas 19373	. . . . . . 7 ⊢ (Base‘𝑅) = (Base‘(oppr‘𝑅))
33		eqid 2821	. . . . . . 7 ⊢ (.r‘(oppr‘𝑅)) = (.r‘(oppr‘𝑅))
34	32, 26, 33	dvdsr2 19391	. . . . . 6 ⊢ (𝑥 ∈ (Base‘𝑅) → (𝑥(∥r‘(oppr‘𝑅))(1r‘𝑅) ↔ ∃𝑚 ∈ (Base‘𝑅)(𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))
35	29, 34	syl 17	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → (𝑥(∥r‘(oppr‘𝑅))(1r‘𝑅) ↔ ∃𝑚 ∈ (Base‘𝑅)(𝑚(.r‘(oppr‘𝑅))𝑥) = (1r‘𝑅)))
36	31, 35	anbi12d 632	. . . 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))))
37		reeanv 3367	. . . . 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)))
38		simprl 769	. . . . . . . . . . . 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))
39	29	ad2antrr 724	. . . . . . . . . . . 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))
40	12, 24, 7	dvdsrmul 19392	. . . . . . . . . . . 12 ⊢ ((𝑚 ∈ (Base‘𝑅) ∧ 𝑥 ∈ (Base‘𝑅)) → 𝑚(∥r‘𝑅)(𝑥(.r‘𝑅)𝑚))
41	38, 39, 40	syl2anc 586	. . . . . . . . . . 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))
42		simplll 773	. . . . . . . . . . . . . 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)
43		simplr 767	. . . . . . . . . . . . . 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))
44	12, 7	ringass 19308	. . . . . . . . . . . . . 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)))
45	42, 43, 39, 38, 44	syl13anc 1368	. . . . . . . . . . . . 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)))
46		simprrl 779	. . . . . . . . . . . . . 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))
47	46	oveq1d 7165	. . . . . . . . . . . . 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))
48	12, 7, 25, 33	opprmul 19370	. . . . . . . . . . . . . . 15 ⊢ (𝑚(.r‘(oppr‘𝑅))𝑥) = (𝑥(.r‘𝑅)𝑚)
49		simprrr 780	. . . . . . . . . . . . . . 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))
50	48, 49	syl5eqr 2870	. . . . . . . . . . . . . 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))
51	50	oveq2d 7166	. . . . . . . . . . . . 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)))
52	45, 47, 51	3eqtr3d 2864	. . . . . . . . . . . 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)))
53	12, 7, 19	ringlidm 19315	. . . . . . . . . . . . 13 ⊢ ((𝑅 ∈ Ring ∧ 𝑚 ∈ (Base‘𝑅)) → ((1r‘𝑅)(.r‘𝑅)𝑚) = 𝑚)
54	42, 38, 53	syl2anc 586	. . . . . . . . . . . 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)
55	12, 7, 19	ringridm 19316	. . . . . . . . . . . . 13 ⊢ ((𝑅 ∈ Ring ∧ 𝑦 ∈ (Base‘𝑅)) → (𝑦(.r‘𝑅)(1r‘𝑅)) = 𝑦)
56	42, 43, 55	syl2anc 586	. . . . . . . . . . . 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)
57	52, 54, 56	3eqtr3d 2864	. . . . . . . . . . 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)
58	41, 57, 50	3brtr3d 5089	. . . . . . . . . 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))
59	32, 26, 33	dvdsrmul 19392	. . . . . . . . . . . 12 ⊢ ((𝑦 ∈ (Base‘𝑅) ∧ 𝑥 ∈ (Base‘𝑅)) → 𝑦(∥r‘(oppr‘𝑅))(𝑥(.r‘(oppr‘𝑅))𝑦))
60	43, 39, 59	syl2anc 586	. . . . . . . . . . 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))
61	12, 7, 25, 33	opprmul 19370	. . . . . . . . . . . 12 ⊢ (𝑥(.r‘(oppr‘𝑅))𝑦) = (𝑦(.r‘𝑅)𝑥)
62	61, 46	syl5eq 2868	. . . . . . . . . . 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))
63	60, 62	breqtrd 5084	. . . . . . . . . 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))
64	1, 19, 24, 25, 26	isunit 19401	. . . . . . . . . 10 ⊢ (𝑦 ∈ 𝑈 ↔ (𝑦(∥r‘𝑅)(1r‘𝑅) ∧ 𝑦(∥r‘(oppr‘𝑅))(1r‘𝑅)))
65	58, 63, 64	sylanbrc 585	. . . . . . . . 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)
66	65, 46	jca 514	. . . . . . . 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)))
67	66	rexlimdvaa 3285	. . . . . . 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))))
68	67	expimpd 456	. . . . . 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))))
69	68	reximdv2 3271	. . . . 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)))
70	37, 69	syl5bir 245	. . . 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)))
71	36, 70	sylbid 242	. . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → ((𝑥(∥r‘𝑅)(1r‘𝑅) ∧ 𝑥(∥r‘(oppr‘𝑅))(1r‘𝑅)) → ∃𝑦 ∈ 𝑈 (𝑦(.r‘𝑅)𝑥) = (1r‘𝑅)))
72	28, 71	mpd 15	. 2 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝑈) → ∃𝑦 ∈ 𝑈 (𝑦(.r‘𝑅)𝑥) = (1r‘𝑅))
73	4, 10, 11, 18, 20, 22, 72	isgrpde 18118	1 ⊢ (𝑅 ∈ Ring → 𝐺 ∈ Grp)

Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 398   ∧ w3a 1083   = wceq 1533   ∈ wcel 2110  ∃wrex 3139  Vcvv 3494   class class class wbr 5058  ‘cfv 6349  (class class class)co 7150  Basecbs 16477   ↾_s cress 16478  +_gcplusg 16559  ._rcmulr 16560  Grpcgrp 18097  mulGrpcmgp 19233  1_rcur 19245  Ringcrg 19291  opp_rcoppr 19366  ∥_rcdsr 19382  Unitcui 19383

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2157  ax-12 2173  ax-ext 2793  ax-rep 5182  ax-sep 5195  ax-nul 5202  ax-pow 5258  ax-pr 5321  ax-un 7455  ax-cnex 10587  ax-resscn 10588  ax-1cn 10589  ax-icn 10590  ax-addcl 10591  ax-addrcl 10592  ax-mulcl 10593  ax-mulrcl 10594  ax-mulcom 10595  ax-addass 10596  ax-mulass 10597  ax-distr 10598  ax-i2m1 10599  ax-1ne0 10600  ax-1rid 10601  ax-rnegex 10602  ax-rrecex 10603  ax-cnre 10604  ax-pre-lttri 10605  ax-pre-lttrn 10606  ax-pre-ltadd 10607  ax-pre-mulgt0 10608

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-nel 3124  df-ral 3143  df-rex 3144  df-reu 3145  df-rmo 3146  df-rab 3147  df-v 3496  df-sbc 3772  df-csb 3883  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-pss 3953  df-nul 4291  df-if 4467  df-pw 4540  df-sn 4561  df-pr 4563  df-tp 4565  df-op 4567  df-uni 4832  df-iun 4913  df-br 5059  df-opab 5121  df-mpt 5139  df-tr 5165  df-id 5454  df-eprel 5459  df-po 5468  df-so 5469  df-fr 5508  df-we 5510  df-xp 5555  df-rel 5556  df-cnv 5557  df-co 5558  df-dm 5559  df-rn 5560  df-res 5561  df-ima 5562  df-pred 6142  df-ord 6188  df-on 6189  df-lim 6190  df-suc 6191  df-iota 6308  df-fun 6351  df-fn 6352  df-f 6353  df-f1 6354  df-fo 6355  df-f1o 6356  df-fv 6357  df-riota 7108  df-ov 7153  df-oprab 7154  df-mpo 7155  df-om 7575  df-tpos 7886  df-wrecs 7941  df-recs 8002  df-rdg 8040  df-er 8283  df-en 8504  df-dom 8505  df-sdom 8506  df-pnf 10671  df-mnf 10672  df-xr 10673  df-ltxr 10674  df-le 10675  df-sub 10866  df-neg 10867  df-nn 11633  df-2 11694  df-3 11695  df-ndx 16480  df-slot 16481  df-base 16483  df-sets 16484  df-ress 16485  df-plusg 16572  df-mulr 16573  df-0g 16709  df-mgm 17846  df-sgrp 17895  df-mnd 17906  df-grp 18100  df-mgp 19234  df-ur 19246  df-ring 19293  df-oppr 19367  df-dvdsr 19385  df-unit 19386

This theorem is referenced by:  unitabl  19412  unitsubm  19414  unitinvcl  19418  unitinvinv  19419  unitlinv  19421  unitrinv  19422  isdrng2  19506  subrgugrp  19548  expghm  20637  invrvald  21279  nrginvrcn  23295  nrgtdrg  23296  dchrfi  25825  dchrghm  25826  dchrabs  25830  dchrptlem1  25834  dchrptlem2  25835  dchrptlem3  25836  dchrsum2  25838  rdivmuldivd  30857  dvrcan5  30859  rhmunitinv  30890  idomodle  39789  proot1mul  39792  proot1hash  39793  proot1ex  39794