lidldomn1 - Mathbox for Alexander van der Vekens

	Mathbox for Alexander van der Vekens		< Previous Next > Nearby theorems
Mirrors > Home > MPE Home > Th. List > Mathboxes > lidldomn1		Structured version Visualization version GIF version

Theorem lidldomn1 46902

Description: If a (left) ideal (which is not the zero ideal) of a domain has a multiplicative identity element, the identity element is the identity of the domain. (Contributed by AV, 17-Feb-2020.)

**Hypotheses**
Ref	Expression
lidldomn1.l	⊢ 𝐿 = (LIdeal‘𝑅)
lidldomn1.t	⊢ · = (._r‘𝑅)
lidldomn1.1	⊢ 1 = (1_r‘𝑅)
lidldomn1.0	⊢ 0 = (0_g‘𝑅)

**Assertion**
Ref	Expression
lidldomn1	⊢ ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → (∀𝑥 ∈ 𝑈 ((𝐼 · 𝑥) = 𝑥 ∧ (𝑥 · 𝐼) = 𝑥) → 𝐼 = 1 ))

Distinct variable groups: 𝑥,𝐼 𝑥,𝑈 𝑥, · Allowed substitution hints: 𝑅(𝑥) 1 (𝑥) 𝐿(𝑥) 0 (𝑥)

Proof of Theorem lidldomn1 Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		domnring 20918	. . . 4 ⊢ (𝑅 ∈ Domn → 𝑅 ∈ Ring)
2	1	3ad2ant1 1133	. . 3 ⊢ ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → 𝑅 ∈ Ring)
3		simp2l 1199	. . 3 ⊢ ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → 𝑈 ∈ 𝐿)
4		simp2r 1200	. . 3 ⊢ ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → 𝑈 ≠ { 0 })
5		lidldomn1.l	. . . 4 ⊢ 𝐿 = (LIdeal‘𝑅)
6		lidldomn1.0	. . . 4 ⊢ 0 = (0_g‘𝑅)
7	5, 6	lidlnz 20859	. . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) → ∃𝑦 ∈ 𝑈 𝑦 ≠ 0 )
8	2, 3, 4, 7	syl3anc 1371	. 2 ⊢ ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → ∃𝑦 ∈ 𝑈 𝑦 ≠ 0 )
9		oveq2 7419	. . . . . . . . . . 11 ⊢ (𝑥 = 𝑦 → (𝐼 · 𝑥) = (𝐼 · 𝑦))
10		id 22	. . . . . . . . . . 11 ⊢ (𝑥 = 𝑦 → 𝑥 = 𝑦)
11	9, 10	eqeq12d 2748	. . . . . . . . . 10 ⊢ (𝑥 = 𝑦 → ((𝐼 · 𝑥) = 𝑥 ↔ (𝐼 · 𝑦) = 𝑦))
12		oveq1 7418	. . . . . . . . . . 11 ⊢ (𝑥 = 𝑦 → (𝑥 · 𝐼) = (𝑦 · 𝐼))
13	12, 10	eqeq12d 2748	. . . . . . . . . 10 ⊢ (𝑥 = 𝑦 → ((𝑥 · 𝐼) = 𝑥 ↔ (𝑦 · 𝐼) = 𝑦))
14	11, 13	anbi12d 631	. . . . . . . . 9 ⊢ (𝑥 = 𝑦 → (((𝐼 · 𝑥) = 𝑥 ∧ (𝑥 · 𝐼) = 𝑥) ↔ ((𝐼 · 𝑦) = 𝑦 ∧ (𝑦 · 𝐼) = 𝑦)))
15	14	rspcva 3610	. . . . . . . 8 ⊢ ((𝑦 ∈ 𝑈 ∧ ∀𝑥 ∈ 𝑈 ((𝐼 · 𝑥) = 𝑥 ∧ (𝑥 · 𝐼) = 𝑥)) → ((𝐼 · 𝑦) = 𝑦 ∧ (𝑦 · 𝐼) = 𝑦))
16	2	adantr 481	. . . . . . . . . . . . . 14 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → 𝑅 ∈ Ring)
17		eqid 2732	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (Base‘𝑅) = (Base‘𝑅)
18	17, 5	lidlss 20839	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑈 ∈ 𝐿 → 𝑈 ⊆ (Base‘𝑅))
19	18	adantr 481	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) → 𝑈 ⊆ (Base‘𝑅))
20	19	3ad2ant2 1134	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → 𝑈 ⊆ (Base‘𝑅))
21	20	sseld 3981	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → (𝑦 ∈ 𝑈 → 𝑦 ∈ (Base‘𝑅)))
22	21	com12 32	. . . . . . . . . . . . . . . 16 ⊢ (𝑦 ∈ 𝑈 → ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → 𝑦 ∈ (Base‘𝑅)))
23	22	adantr 481	. . . . . . . . . . . . . . 15 ⊢ ((𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 ) → ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → 𝑦 ∈ (Base‘𝑅)))
24	23	impcom 408	. . . . . . . . . . . . . 14 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → 𝑦 ∈ (Base‘𝑅))
25		lidldomn1.t	. . . . . . . . . . . . . . 15 ⊢ · = (._r‘𝑅)
26		lidldomn1.1	. . . . . . . . . . . . . . 15 ⊢ 1 = (1_r‘𝑅)
27	17, 25, 26	ringlidm 20088	. . . . . . . . . . . . . 14 ⊢ ((𝑅 ∈ Ring ∧ 𝑦 ∈ (Base‘𝑅)) → ( 1 · 𝑦) = 𝑦)
28	16, 24, 27	syl2anc 584	. . . . . . . . . . . . 13 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → ( 1 · 𝑦) = 𝑦)
29		eqeq2 2744	. . . . . . . . . . . . . . . 16 ⊢ (𝑦 = ( 1 · 𝑦) → ((𝐼 · 𝑦) = 𝑦 ↔ (𝐼 · 𝑦) = ( 1 · 𝑦)))
30	29	eqcoms 2740	. . . . . . . . . . . . . . 15 ⊢ (( 1 · 𝑦) = 𝑦 → ((𝐼 · 𝑦) = 𝑦 ↔ (𝐼 · 𝑦) = ( 1 · 𝑦)))
31	30	adantl 482	. . . . . . . . . . . . . 14 ⊢ ((((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) ∧ ( 1 · 𝑦) = 𝑦) → ((𝐼 · 𝑦) = 𝑦 ↔ (𝐼 · 𝑦) = ( 1 · 𝑦)))
32		ringgrp 20063	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ Grp)
33	1, 32	syl 17	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑅 ∈ Domn → 𝑅 ∈ Grp)
34	33	3ad2ant1 1133	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → 𝑅 ∈ Grp)
35	34	adantr 481	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → 𝑅 ∈ Grp)
36	19	sseld 3981	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) → (𝐼 ∈ 𝑈 → 𝐼 ∈ (Base‘𝑅)))
37	36	a1i 11	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑅 ∈ Domn → ((𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) → (𝐼 ∈ 𝑈 → 𝐼 ∈ (Base‘𝑅))))
38	37	3imp 1111	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → 𝐼 ∈ (Base‘𝑅))
39	38	adantr 481	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → 𝐼 ∈ (Base‘𝑅))
40	17, 25	ringcl 20075	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑅 ∈ Ring ∧ 𝐼 ∈ (Base‘𝑅) ∧ 𝑦 ∈ (Base‘𝑅)) → (𝐼 · 𝑦) ∈ (Base‘𝑅))
41	16, 39, 24, 40	syl3anc 1371	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → (𝐼 · 𝑦) ∈ (Base‘𝑅))
42	17, 26	ringidcl 20085	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑅 ∈ Ring → 1 ∈ (Base‘𝑅))
43	1, 42	syl 17	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑅 ∈ Domn → 1 ∈ (Base‘𝑅))
44	43	3ad2ant1 1133	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → 1 ∈ (Base‘𝑅))
45	44	adantr 481	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → 1 ∈ (Base‘𝑅))
46	17, 25	ringcl 20075	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑅 ∈ Ring ∧ 1 ∈ (Base‘𝑅) ∧ 𝑦 ∈ (Base‘𝑅)) → ( 1 · 𝑦) ∈ (Base‘𝑅))
47	16, 45, 24, 46	syl3anc 1371	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → ( 1 · 𝑦) ∈ (Base‘𝑅))
48		eqid 2732	. . . . . . . . . . . . . . . . . 18 ⊢ (-_g‘𝑅) = (-_g‘𝑅)
49	17, 6, 48	grpsubeq0 18911	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑅 ∈ Grp ∧ (𝐼 · 𝑦) ∈ (Base‘𝑅) ∧ ( 1 · 𝑦) ∈ (Base‘𝑅)) → (((𝐼 · 𝑦)(-_g‘𝑅)( 1 · 𝑦)) = 0 ↔ (𝐼 · 𝑦) = ( 1 · 𝑦)))
50	35, 41, 47, 49	syl3anc 1371	. . . . . . . . . . . . . . . 16 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → (((𝐼 · 𝑦)(-_g‘𝑅)( 1 · 𝑦)) = 0 ↔ (𝐼 · 𝑦) = ( 1 · 𝑦)))
51	17, 25, 48, 16, 39, 45, 24	ringsubdir 20124	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → ((𝐼(-_g‘𝑅) 1 ) · 𝑦) = ((𝐼 · 𝑦)(-_g‘𝑅)( 1 · 𝑦)))
52	51	eqeq1d 2734	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → (((𝐼(-_g‘𝑅) 1 ) · 𝑦) = 0 ↔ ((𝐼 · 𝑦)(-_g‘𝑅)( 1 · 𝑦)) = 0 ))
53		simpl1 1191	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → 𝑅 ∈ Domn)
54	34, 38, 44	3jca 1128	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → (𝑅 ∈ Grp ∧ 𝐼 ∈ (Base‘𝑅) ∧ 1 ∈ (Base‘𝑅)))
55	54	adantr 481	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → (𝑅 ∈ Grp ∧ 𝐼 ∈ (Base‘𝑅) ∧ 1 ∈ (Base‘𝑅)))
56	17, 48	grpsubcl 18905	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝑅 ∈ Grp ∧ 𝐼 ∈ (Base‘𝑅) ∧ 1 ∈ (Base‘𝑅)) → (𝐼(-_g‘𝑅) 1 ) ∈ (Base‘𝑅))
57	55, 56	syl 17	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → (𝐼(-_g‘𝑅) 1 ) ∈ (Base‘𝑅))
58	17, 25, 6	domneq0 20919	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑅 ∈ Domn ∧ (𝐼(-_g‘𝑅) 1 ) ∈ (Base‘𝑅) ∧ 𝑦 ∈ (Base‘𝑅)) → (((𝐼(-_g‘𝑅) 1 ) · 𝑦) = 0 ↔ ((𝐼(-_g‘𝑅) 1 ) = 0 ∨ 𝑦 = 0 )))
59	53, 57, 24, 58	syl3anc 1371	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → (((𝐼(-_g‘𝑅) 1 ) · 𝑦) = 0 ↔ ((𝐼(-_g‘𝑅) 1 ) = 0 ∨ 𝑦 = 0 )))
60	17, 6, 48	grpsubeq0 18911	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((𝑅 ∈ Grp ∧ 𝐼 ∈ (Base‘𝑅) ∧ 1 ∈ (Base‘𝑅)) → ((𝐼(-_g‘𝑅) 1 ) = 0 ↔ 𝐼 = 1 ))
61	55, 60	syl 17	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → ((𝐼(-_g‘𝑅) 1 ) = 0 ↔ 𝐼 = 1 ))
62	61	biimpd 228	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → ((𝐼(-_g‘𝑅) 1 ) = 0 → 𝐼 = 1 ))
63		eqneqall 2951	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑦 = 0 → (𝑦 ≠ 0 → 𝐼 = 1 ))
64	63	com12 32	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑦 ≠ 0 → (𝑦 = 0 → 𝐼 = 1 ))
65	64	adantl 482	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 ) → (𝑦 = 0 → 𝐼 = 1 ))
66	65	adantl 482	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → (𝑦 = 0 → 𝐼 = 1 ))
67	62, 66	jaod 857	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → (((𝐼(-_g‘𝑅) 1 ) = 0 ∨ 𝑦 = 0 ) → 𝐼 = 1 ))
68	59, 67	sylbid 239	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → (((𝐼(-_g‘𝑅) 1 ) · 𝑦) = 0 → 𝐼 = 1 ))
69	52, 68	sylbird 259	. . . . . . . . . . . . . . . 16 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → (((𝐼 · 𝑦)(-_g‘𝑅)( 1 · 𝑦)) = 0 → 𝐼 = 1 ))
70	50, 69	sylbird 259	. . . . . . . . . . . . . . 15 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → ((𝐼 · 𝑦) = ( 1 · 𝑦) → 𝐼 = 1 ))
71	70	adantr 481	. . . . . . . . . . . . . 14 ⊢ ((((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) ∧ ( 1 · 𝑦) = 𝑦) → ((𝐼 · 𝑦) = ( 1 · 𝑦) → 𝐼 = 1 ))
72	31, 71	sylbid 239	. . . . . . . . . . . . 13 ⊢ ((((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) ∧ ( 1 · 𝑦) = 𝑦) → ((𝐼 · 𝑦) = 𝑦 → 𝐼 = 1 ))
73	28, 72	mpdan 685	. . . . . . . . . . . 12 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 )) → ((𝐼 · 𝑦) = 𝑦 → 𝐼 = 1 ))
74	73	ex 413	. . . . . . . . . . 11 ⊢ ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → ((𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 ) → ((𝐼 · 𝑦) = 𝑦 → 𝐼 = 1 )))
75	74	com13 88	. . . . . . . . . 10 ⊢ ((𝐼 · 𝑦) = 𝑦 → ((𝑦 ∈ 𝑈 ∧ 𝑦 ≠ 0 ) → ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → 𝐼 = 1 )))
76	75	expd 416	. . . . . . . . 9 ⊢ ((𝐼 · 𝑦) = 𝑦 → (𝑦 ∈ 𝑈 → (𝑦 ≠ 0 → ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → 𝐼 = 1 ))))
77	76	adantr 481	. . . . . . . 8 ⊢ (((𝐼 · 𝑦) = 𝑦 ∧ (𝑦 · 𝐼) = 𝑦) → (𝑦 ∈ 𝑈 → (𝑦 ≠ 0 → ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → 𝐼 = 1 ))))
78	15, 77	syl 17	. . . . . . 7 ⊢ ((𝑦 ∈ 𝑈 ∧ ∀𝑥 ∈ 𝑈 ((𝐼 · 𝑥) = 𝑥 ∧ (𝑥 · 𝐼) = 𝑥)) → (𝑦 ∈ 𝑈 → (𝑦 ≠ 0 → ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → 𝐼 = 1 ))))
79	78	ex 413	. . . . . 6 ⊢ (𝑦 ∈ 𝑈 → (∀𝑥 ∈ 𝑈 ((𝐼 · 𝑥) = 𝑥 ∧ (𝑥 · 𝐼) = 𝑥) → (𝑦 ∈ 𝑈 → (𝑦 ≠ 0 → ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → 𝐼 = 1 )))))
80	79	pm2.43b 55	. . . . 5 ⊢ (∀𝑥 ∈ 𝑈 ((𝐼 · 𝑥) = 𝑥 ∧ (𝑥 · 𝐼) = 𝑥) → (𝑦 ∈ 𝑈 → (𝑦 ≠ 0 → ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → 𝐼 = 1 ))))
81	80	com14 96	. . . 4 ⊢ ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → (𝑦 ∈ 𝑈 → (𝑦 ≠ 0 → (∀𝑥 ∈ 𝑈 ((𝐼 · 𝑥) = 𝑥 ∧ (𝑥 · 𝐼) = 𝑥) → 𝐼 = 1 ))))
82	81	imp 407	. . 3 ⊢ (((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) ∧ 𝑦 ∈ 𝑈) → (𝑦 ≠ 0 → (∀𝑥 ∈ 𝑈 ((𝐼 · 𝑥) = 𝑥 ∧ (𝑥 · 𝐼) = 𝑥) → 𝐼 = 1 )))
83	82	rexlimdva 3155	. 2 ⊢ ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → (∃𝑦 ∈ 𝑈 𝑦 ≠ 0 → (∀𝑥 ∈ 𝑈 ((𝐼 · 𝑥) = 𝑥 ∧ (𝑥 · 𝐼) = 𝑥) → 𝐼 = 1 )))
84	8, 83	mpd 15	1 ⊢ ((𝑅 ∈ Domn ∧ (𝑈 ∈ 𝐿 ∧ 𝑈 ≠ { 0 }) ∧ 𝐼 ∈ 𝑈) → (∀𝑥 ∈ 𝑈 ((𝐼 · 𝑥) = 𝑥 ∧ (𝑥 · 𝐼) = 𝑥) → 𝐼 = 1 ))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∨ wo 845 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ≠ wne 2940 ∀wral 3061 ∃wrex 3070 ⊆ wss 3948 {csn 4628 ‘cfv 6543 (class class class)co 7411 Basecbs 17146 ._rcmulr 17200 0_gc0g 17387 Grpcgrp 18821 -_gcsg 18823 1_rcur 20006 Ringcrg 20058 LIdealclidl 20789 Domncdomn 20902

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 7727 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189

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 7367 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7858 df-1st 7977 df-2nd 7978 df-frecs 8268 df-wrecs 8299 df-recs 8373 df-rdg 8412 df-er 8705 df-en 8942 df-dom 8943 df-sdom 8944 df-pnf 11252 df-mnf 11253 df-xr 11254 df-ltxr 11255 df-le 11256 df-sub 11448 df-neg 11449 df-nn 12215 df-2 12277 df-3 12278 df-4 12279 df-5 12280 df-6 12281 df-7 12282 df-8 12283 df-sets 17099 df-slot 17117 df-ndx 17129 df-base 17147 df-ress 17176 df-plusg 17212 df-mulr 17213 df-sca 17215 df-vsca 17216 df-ip 17217 df-0g 17389 df-mgm 18563 df-sgrp 18612 df-mnd 18628 df-grp 18824 df-minusg 18825 df-sbg 18826 df-subg 19005 df-mgp 19990 df-ur 20007 df-ring 20060 df-nzr 20296 df-subrg 20321 df-lmod 20477 df-lss 20548 df-sra 20791 df-rgmod 20792 df-lidl 20793 df-domn 20906

This theorem is referenced by: uzlidlring 46906

W3C validator