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Theorem znrrg 21120

Description: The regular elements of ℤ/nℤ are exactly the units. (This theorem fails for 𝑁 = 0, where all nonzero integers are regular, but only ±1 are units.) (Contributed by Mario Carneiro, 18-Apr-2016.)

**Hypotheses**
Ref	Expression
znchr.y	⊢ 𝑌 = (ℤ/nℤ‘𝑁)
znunit.u	⊢ 𝑈 = (Unit‘𝑌)
znrrg.e	⊢ 𝐸 = (RLReg‘𝑌)

**Assertion**
Ref	Expression
znrrg	⊢ (𝑁 ∈ ℕ → 𝐸 = 𝑈)

Proof of Theorem znrrg Dummy variables 𝑛 𝑥 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		nnnn0 12478	. . . . . . 7 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℕ₀)
2		znchr.y	. . . . . . . 8 ⊢ 𝑌 = (ℤ/nℤ‘𝑁)
3		eqid 2732	. . . . . . . 8 ⊢ (Base‘𝑌) = (Base‘𝑌)
4		eqid 2732	. . . . . . . 8 ⊢ (ℤRHom‘𝑌) = (ℤRHom‘𝑌)
5	2, 3, 4	znzrhfo 21102	. . . . . . 7 ⊢ (𝑁 ∈ ℕ₀ → (ℤRHom‘𝑌):ℤ–onto→(Base‘𝑌))
6	1, 5	syl 17	. . . . . 6 ⊢ (𝑁 ∈ ℕ → (ℤRHom‘𝑌):ℤ–onto→(Base‘𝑌))
7		znrrg.e	. . . . . . . 8 ⊢ 𝐸 = (RLReg‘𝑌)
8	7, 3	rrgss 20907	. . . . . . 7 ⊢ 𝐸 ⊆ (Base‘𝑌)
9	8	sseli 3978	. . . . . 6 ⊢ (𝑥 ∈ 𝐸 → 𝑥 ∈ (Base‘𝑌))
10		foelrn 7107	. . . . . 6 ⊢ (((ℤRHom‘𝑌):ℤ–onto→(Base‘𝑌) ∧ 𝑥 ∈ (Base‘𝑌)) → ∃𝑛 ∈ ℤ 𝑥 = ((ℤRHom‘𝑌)‘𝑛))
11	6, 9, 10	syl2an 596	. . . . 5 ⊢ ((𝑁 ∈ ℕ ∧ 𝑥 ∈ 𝐸) → ∃𝑛 ∈ ℤ 𝑥 = ((ℤRHom‘𝑌)‘𝑛))
12	11	ex 413	. . . 4 ⊢ (𝑁 ∈ ℕ → (𝑥 ∈ 𝐸 → ∃𝑛 ∈ ℤ 𝑥 = ((ℤRHom‘𝑌)‘𝑛)))
13		nncn 12219	. . . . . . . . . . . . . . . 16 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℂ)
14	13	ad2antrr 724	. . . . . . . . . . . . . . 15 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → 𝑁 ∈ ℂ)
15		simplr 767	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → 𝑛 ∈ ℤ)
16		nnz 12578	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℤ)
17	16	ad2antrr 724	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → 𝑁 ∈ ℤ)
18		nnne0 12245	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑁 ∈ ℕ → 𝑁 ≠ 0)
19	18	ad2antrr 724	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → 𝑁 ≠ 0)
20		simpr 485	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑛 = 0 ∧ 𝑁 = 0) → 𝑁 = 0)
21	20	necon3ai 2965	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑁 ≠ 0 → ¬ (𝑛 = 0 ∧ 𝑁 = 0))
22	19, 21	syl 17	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ¬ (𝑛 = 0 ∧ 𝑁 = 0))
23		gcdn0cl 16442	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑛 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ ¬ (𝑛 = 0 ∧ 𝑁 = 0)) → (𝑛 gcd 𝑁) ∈ ℕ)
24	15, 17, 22, 23	syl21anc 836	. . . . . . . . . . . . . . . 16 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑛 gcd 𝑁) ∈ ℕ)
25	24	nncnd 12227	. . . . . . . . . . . . . . 15 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑛 gcd 𝑁) ∈ ℂ)
26	24	nnne0d 12261	. . . . . . . . . . . . . . 15 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑛 gcd 𝑁) ≠ 0)
27	14, 25, 26	divcan2d 11991	. . . . . . . . . . . . . 14 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((𝑛 gcd 𝑁) · (𝑁 / (𝑛 gcd 𝑁))) = 𝑁)
28		gcddvds 16443	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑛 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑛 gcd 𝑁) ∥ 𝑛 ∧ (𝑛 gcd 𝑁) ∥ 𝑁))
29	15, 17, 28	syl2anc 584	. . . . . . . . . . . . . . . 16 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((𝑛 gcd 𝑁) ∥ 𝑛 ∧ (𝑛 gcd 𝑁) ∥ 𝑁))
30	29	simpld 495	. . . . . . . . . . . . . . 15 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑛 gcd 𝑁) ∥ 𝑛)
31	24	nnzd 12584	. . . . . . . . . . . . . . . 16 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑛 gcd 𝑁) ∈ ℤ)
32	29	simprd 496	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑛 gcd 𝑁) ∥ 𝑁)
33		simpll 765	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → 𝑁 ∈ ℕ)
34		nndivdvds 16205	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑁 ∈ ℕ ∧ (𝑛 gcd 𝑁) ∈ ℕ) → ((𝑛 gcd 𝑁) ∥ 𝑁 ↔ (𝑁 / (𝑛 gcd 𝑁)) ∈ ℕ))
35	33, 24, 34	syl2anc 584	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((𝑛 gcd 𝑁) ∥ 𝑁 ↔ (𝑁 / (𝑛 gcd 𝑁)) ∈ ℕ))
36	32, 35	mpbid 231	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑁 / (𝑛 gcd 𝑁)) ∈ ℕ)
37	36	nnzd 12584	. . . . . . . . . . . . . . . 16 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑁 / (𝑛 gcd 𝑁)) ∈ ℤ)
38		dvdsmulc 16226	. . . . . . . . . . . . . . . 16 ⊢ (((𝑛 gcd 𝑁) ∈ ℤ ∧ 𝑛 ∈ ℤ ∧ (𝑁 / (𝑛 gcd 𝑁)) ∈ ℤ) → ((𝑛 gcd 𝑁) ∥ 𝑛 → ((𝑛 gcd 𝑁) · (𝑁 / (𝑛 gcd 𝑁))) ∥ (𝑛 · (𝑁 / (𝑛 gcd 𝑁)))))
39	31, 15, 37, 38	syl3anc 1371	. . . . . . . . . . . . . . 15 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((𝑛 gcd 𝑁) ∥ 𝑛 → ((𝑛 gcd 𝑁) · (𝑁 / (𝑛 gcd 𝑁))) ∥ (𝑛 · (𝑁 / (𝑛 gcd 𝑁)))))
40	30, 39	mpd 15	. . . . . . . . . . . . . 14 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((𝑛 gcd 𝑁) · (𝑁 / (𝑛 gcd 𝑁))) ∥ (𝑛 · (𝑁 / (𝑛 gcd 𝑁))))
41	27, 40	eqbrtrrd 5172	. . . . . . . . . . . . 13 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → 𝑁 ∥ (𝑛 · (𝑁 / (𝑛 gcd 𝑁))))
42		simpr 485	. . . . . . . . . . . . . . 15 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸)
43	1	ad2antrr 724	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → 𝑁 ∈ ℕ₀)
44	43, 5	syl 17	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (ℤRHom‘𝑌):ℤ–onto→(Base‘𝑌))
45		fof 6805	. . . . . . . . . . . . . . . . 17 ⊢ ((ℤRHom‘𝑌):ℤ–onto→(Base‘𝑌) → (ℤRHom‘𝑌):ℤ⟶(Base‘𝑌))
46	44, 45	syl 17	. . . . . . . . . . . . . . . 16 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (ℤRHom‘𝑌):ℤ⟶(Base‘𝑌))
47	46, 37	ffvelcdmd 7087	. . . . . . . . . . . . . . 15 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((ℤRHom‘𝑌)‘(𝑁 / (𝑛 gcd 𝑁))) ∈ (Base‘𝑌))
48		eqid 2732	. . . . . . . . . . . . . . . 16 ⊢ (._r‘𝑌) = (._r‘𝑌)
49		eqid 2732	. . . . . . . . . . . . . . . 16 ⊢ (0_g‘𝑌) = (0_g‘𝑌)
50	7, 3, 48, 49	rrgeq0i 20904	. . . . . . . . . . . . . . 15 ⊢ ((((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸 ∧ ((ℤRHom‘𝑌)‘(𝑁 / (𝑛 gcd 𝑁))) ∈ (Base‘𝑌)) → ((((ℤRHom‘𝑌)‘𝑛)(._r‘𝑌)((ℤRHom‘𝑌)‘(𝑁 / (𝑛 gcd 𝑁)))) = (0_g‘𝑌) → ((ℤRHom‘𝑌)‘(𝑁 / (𝑛 gcd 𝑁))) = (0_g‘𝑌)))
51	42, 47, 50	syl2anc 584	. . . . . . . . . . . . . 14 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((((ℤRHom‘𝑌)‘𝑛)(._r‘𝑌)((ℤRHom‘𝑌)‘(𝑁 / (𝑛 gcd 𝑁)))) = (0_g‘𝑌) → ((ℤRHom‘𝑌)‘(𝑁 / (𝑛 gcd 𝑁))) = (0_g‘𝑌)))
52	2	zncrng 21099	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑁 ∈ ℕ₀ → 𝑌 ∈ CRing)
53	1, 52	syl 17	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑁 ∈ ℕ → 𝑌 ∈ CRing)
54		crngring 20067	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑌 ∈ CRing → 𝑌 ∈ Ring)
55	53, 54	syl 17	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑁 ∈ ℕ → 𝑌 ∈ Ring)
56	55	ad2antrr 724	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → 𝑌 ∈ Ring)
57	4	zrhrhm 21060	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑌 ∈ Ring → (ℤRHom‘𝑌) ∈ (ℤ_ring RingHom 𝑌))
58	56, 57	syl 17	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (ℤRHom‘𝑌) ∈ (ℤ_ring RingHom 𝑌))
59		zringbas 21022	. . . . . . . . . . . . . . . . . 18 ⊢ ℤ = (Base‘ℤ_ring)
60		zringmulr 21026	. . . . . . . . . . . . . . . . . 18 ⊢ · = (._r‘ℤ_ring)
61	59, 60, 48	rhmmul 20263	. . . . . . . . . . . . . . . . 17 ⊢ (((ℤRHom‘𝑌) ∈ (ℤ_ring RingHom 𝑌) ∧ 𝑛 ∈ ℤ ∧ (𝑁 / (𝑛 gcd 𝑁)) ∈ ℤ) → ((ℤRHom‘𝑌)‘(𝑛 · (𝑁 / (𝑛 gcd 𝑁)))) = (((ℤRHom‘𝑌)‘𝑛)(._r‘𝑌)((ℤRHom‘𝑌)‘(𝑁 / (𝑛 gcd 𝑁)))))
62	58, 15, 37, 61	syl3anc 1371	. . . . . . . . . . . . . . . 16 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((ℤRHom‘𝑌)‘(𝑛 · (𝑁 / (𝑛 gcd 𝑁)))) = (((ℤRHom‘𝑌)‘𝑛)(._r‘𝑌)((ℤRHom‘𝑌)‘(𝑁 / (𝑛 gcd 𝑁)))))
63	62	eqeq1d 2734	. . . . . . . . . . . . . . 15 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (((ℤRHom‘𝑌)‘(𝑛 · (𝑁 / (𝑛 gcd 𝑁)))) = (0_g‘𝑌) ↔ (((ℤRHom‘𝑌)‘𝑛)(._r‘𝑌)((ℤRHom‘𝑌)‘(𝑁 / (𝑛 gcd 𝑁)))) = (0_g‘𝑌)))
64	15, 37	zmulcld 12671	. . . . . . . . . . . . . . . 16 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑛 · (𝑁 / (𝑛 gcd 𝑁))) ∈ ℤ)
65	2, 4, 49	zndvds0 21105	. . . . . . . . . . . . . . . 16 ⊢ ((𝑁 ∈ ℕ₀ ∧ (𝑛 · (𝑁 / (𝑛 gcd 𝑁))) ∈ ℤ) → (((ℤRHom‘𝑌)‘(𝑛 · (𝑁 / (𝑛 gcd 𝑁)))) = (0_g‘𝑌) ↔ 𝑁 ∥ (𝑛 · (𝑁 / (𝑛 gcd 𝑁)))))
66	43, 64, 65	syl2anc 584	. . . . . . . . . . . . . . 15 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (((ℤRHom‘𝑌)‘(𝑛 · (𝑁 / (𝑛 gcd 𝑁)))) = (0_g‘𝑌) ↔ 𝑁 ∥ (𝑛 · (𝑁 / (𝑛 gcd 𝑁)))))
67	63, 66	bitr3d 280	. . . . . . . . . . . . . 14 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((((ℤRHom‘𝑌)‘𝑛)(._r‘𝑌)((ℤRHom‘𝑌)‘(𝑁 / (𝑛 gcd 𝑁)))) = (0_g‘𝑌) ↔ 𝑁 ∥ (𝑛 · (𝑁 / (𝑛 gcd 𝑁)))))
68	2, 4, 49	zndvds0 21105	. . . . . . . . . . . . . . 15 ⊢ ((𝑁 ∈ ℕ₀ ∧ (𝑁 / (𝑛 gcd 𝑁)) ∈ ℤ) → (((ℤRHom‘𝑌)‘(𝑁 / (𝑛 gcd 𝑁))) = (0_g‘𝑌) ↔ 𝑁 ∥ (𝑁 / (𝑛 gcd 𝑁))))
69	43, 37, 68	syl2anc 584	. . . . . . . . . . . . . 14 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (((ℤRHom‘𝑌)‘(𝑁 / (𝑛 gcd 𝑁))) = (0_g‘𝑌) ↔ 𝑁 ∥ (𝑁 / (𝑛 gcd 𝑁))))
70	51, 67, 69	3imtr3d 292	. . . . . . . . . . . . 13 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑁 ∥ (𝑛 · (𝑁 / (𝑛 gcd 𝑁))) → 𝑁 ∥ (𝑁 / (𝑛 gcd 𝑁))))
71	41, 70	mpd 15	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → 𝑁 ∥ (𝑁 / (𝑛 gcd 𝑁)))
72	14, 25, 26	divcan1d 11990	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((𝑁 / (𝑛 gcd 𝑁)) · (𝑛 gcd 𝑁)) = 𝑁)
73	36	nncnd 12227	. . . . . . . . . . . . 13 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑁 / (𝑛 gcd 𝑁)) ∈ ℂ)
74	73	mulridd 11230	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((𝑁 / (𝑛 gcd 𝑁)) · 1) = (𝑁 / (𝑛 gcd 𝑁)))
75	71, 72, 74	3brtr4d 5180	. . . . . . . . . . 11 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((𝑁 / (𝑛 gcd 𝑁)) · (𝑛 gcd 𝑁)) ∥ ((𝑁 / (𝑛 gcd 𝑁)) · 1))
76		1zzd 12592	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → 1 ∈ ℤ)
77	36	nnne0d 12261	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑁 / (𝑛 gcd 𝑁)) ≠ 0)
78		dvdscmulr 16227	. . . . . . . . . . . 12 ⊢ (((𝑛 gcd 𝑁) ∈ ℤ ∧ 1 ∈ ℤ ∧ ((𝑁 / (𝑛 gcd 𝑁)) ∈ ℤ ∧ (𝑁 / (𝑛 gcd 𝑁)) ≠ 0)) → (((𝑁 / (𝑛 gcd 𝑁)) · (𝑛 gcd 𝑁)) ∥ ((𝑁 / (𝑛 gcd 𝑁)) · 1) ↔ (𝑛 gcd 𝑁) ∥ 1))
79	31, 76, 37, 77, 78	syl112anc 1374	. . . . . . . . . . 11 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (((𝑁 / (𝑛 gcd 𝑁)) · (𝑛 gcd 𝑁)) ∥ ((𝑁 / (𝑛 gcd 𝑁)) · 1) ↔ (𝑛 gcd 𝑁) ∥ 1))
80	75, 79	mpbid 231	. . . . . . . . . 10 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑛 gcd 𝑁) ∥ 1)
81	15, 17	gcdcld 16448	. . . . . . . . . . 11 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑛 gcd 𝑁) ∈ ℕ₀)
82		dvds1 16261	. . . . . . . . . . 11 ⊢ ((𝑛 gcd 𝑁) ∈ ℕ₀ → ((𝑛 gcd 𝑁) ∥ 1 ↔ (𝑛 gcd 𝑁) = 1))
83	81, 82	syl 17	. . . . . . . . . 10 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((𝑛 gcd 𝑁) ∥ 1 ↔ (𝑛 gcd 𝑁) = 1))
84	80, 83	mpbid 231	. . . . . . . . 9 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑛 gcd 𝑁) = 1)
85		znunit.u	. . . . . . . . . . 11 ⊢ 𝑈 = (Unit‘𝑌)
86	2, 85, 4	znunit 21118	. . . . . . . . . 10 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑛 ∈ ℤ) → (((ℤRHom‘𝑌)‘𝑛) ∈ 𝑈 ↔ (𝑛 gcd 𝑁) = 1))
87	43, 15, 86	syl2anc 584	. . . . . . . . 9 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (((ℤRHom‘𝑌)‘𝑛) ∈ 𝑈 ↔ (𝑛 gcd 𝑁) = 1))
88	84, 87	mpbird 256	. . . . . . . 8 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((ℤRHom‘𝑌)‘𝑛) ∈ 𝑈)
89	88	ex 413	. . . . . . 7 ⊢ ((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) → (((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸 → ((ℤRHom‘𝑌)‘𝑛) ∈ 𝑈))
90		eleq1 2821	. . . . . . . 8 ⊢ (𝑥 = ((ℤRHom‘𝑌)‘𝑛) → (𝑥 ∈ 𝐸 ↔ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸))
91		eleq1 2821	. . . . . . . 8 ⊢ (𝑥 = ((ℤRHom‘𝑌)‘𝑛) → (𝑥 ∈ 𝑈 ↔ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝑈))
92	90, 91	imbi12d 344	. . . . . . 7 ⊢ (𝑥 = ((ℤRHom‘𝑌)‘𝑛) → ((𝑥 ∈ 𝐸 → 𝑥 ∈ 𝑈) ↔ (((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸 → ((ℤRHom‘𝑌)‘𝑛) ∈ 𝑈)))
93	89, 92	syl5ibrcom 246	. . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) → (𝑥 = ((ℤRHom‘𝑌)‘𝑛) → (𝑥 ∈ 𝐸 → 𝑥 ∈ 𝑈)))
94	93	rexlimdva 3155	. . . . 5 ⊢ (𝑁 ∈ ℕ → (∃𝑛 ∈ ℤ 𝑥 = ((ℤRHom‘𝑌)‘𝑛) → (𝑥 ∈ 𝐸 → 𝑥 ∈ 𝑈)))
95	94	com23 86	. . . 4 ⊢ (𝑁 ∈ ℕ → (𝑥 ∈ 𝐸 → (∃𝑛 ∈ ℤ 𝑥 = ((ℤRHom‘𝑌)‘𝑛) → 𝑥 ∈ 𝑈)))
96	12, 95	mpdd 43	. . 3 ⊢ (𝑁 ∈ ℕ → (𝑥 ∈ 𝐸 → 𝑥 ∈ 𝑈))
97	96	ssrdv 3988	. 2 ⊢ (𝑁 ∈ ℕ → 𝐸 ⊆ 𝑈)
98	7, 85	unitrrg 20908	. . 3 ⊢ (𝑌 ∈ Ring → 𝑈 ⊆ 𝐸)
99	55, 98	syl 17	. 2 ⊢ (𝑁 ∈ ℕ → 𝑈 ⊆ 𝐸)
100	97, 99	eqssd 3999	1 ⊢ (𝑁 ∈ ℕ → 𝐸 = 𝑈)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 396 = wceq 1541 ∈ wcel 2106 ≠ wne 2940 ∃wrex 3070 ⊆ wss 3948 class class class wbr 5148 ⟶wf 6539 –onto→wfo 6541 ‘cfv 6543 (class class class)co 7408 ℂcc 11107 0cc0 11109 1c1 11110 · cmul 11114 / cdiv 11870 ℕcn 12211 ℕ₀cn0 12471 ℤcz 12557 ∥ cdvds 16196 gcd cgcd 16434 Basecbs 17143 ._rcmulr 17197 0_gc0g 17384 Ringcrg 20055 CRingccrg 20056 Unitcui 20168 RingHom crh 20247 RLRegcrlreg 20894 ℤ_ringczring 21016 ℤRHomczrh 21048 ℤ/nℤczn 21051

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 ax-pre-sup 11187 ax-addf 11188 ax-mulf 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-tp 4633 df-op 4635 df-uni 4909 df-int 4951 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-1st 7974 df-2nd 7975 df-tpos 8210 df-frecs 8265 df-wrecs 8296 df-recs 8370 df-rdg 8409 df-1o 8465 df-er 8702 df-ec 8704 df-qs 8708 df-map 8821 df-en 8939 df-dom 8940 df-sdom 8941 df-fin 8942 df-sup 9436 df-inf 9437 df-pnf 11249 df-mnf 11250 df-xr 11251 df-ltxr 11252 df-le 11253 df-sub 11445 df-neg 11446 df-div 11871 df-nn 12212 df-2 12274 df-3 12275 df-4 12276 df-5 12277 df-6 12278 df-7 12279 df-8 12280 df-9 12281 df-n0 12472 df-z 12558 df-dec 12677 df-uz 12822 df-rp 12974 df-fz 13484 df-fl 13756 df-mod 13834 df-seq 13966 df-exp 14027 df-cj 15045 df-re 15046 df-im 15047 df-sqrt 15181 df-abs 15182 df-dvds 16197 df-gcd 16435 df-struct 17079 df-sets 17096 df-slot 17114 df-ndx 17126 df-base 17144 df-ress 17173 df-plusg 17209 df-mulr 17210 df-starv 17211 df-sca 17212 df-vsca 17213 df-ip 17214 df-tset 17215 df-ple 17216 df-ds 17218 df-unif 17219 df-0g 17386 df-imas 17453 df-qus 17454 df-mgm 18560 df-sgrp 18609 df-mnd 18625 df-mhm 18670 df-grp 18821 df-minusg 18822 df-sbg 18823 df-mulg 18950 df-subg 19002 df-nsg 19003 df-eqg 19004 df-ghm 19089 df-cmn 19649 df-abl 19650 df-mgp 19987 df-ur 20004 df-ring 20057 df-cring 20058 df-oppr 20149 df-dvdsr 20170 df-unit 20171 df-invr 20201 df-rnghom 20250 df-subrg 20316 df-lmod 20472 df-lss 20542 df-lsp 20582 df-sra 20784 df-rgmod 20785 df-lidl 20786 df-rsp 20787 df-2idl 20856 df-rlreg 20898 df-cnfld 20944 df-zring 21017 df-zrh 21052 df-zn 21055

This theorem is referenced by: (None)

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