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Theorem znrrg 21121

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 12479	. . . . . . 7 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℕ₀)
2		znchr.y	. . . . . . . 8 ⊢ 𝑌 = (ℤ/nℤ‘𝑁)
3		eqid 2733	. . . . . . . 8 ⊢ (Base‘𝑌) = (Base‘𝑌)
4		eqid 2733	. . . . . . . 8 ⊢ (ℤRHom‘𝑌) = (ℤRHom‘𝑌)
5	2, 3, 4	znzrhfo 21103	. . . . . . 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 20908	. . . . . . 7 ⊢ 𝐸 ⊆ (Base‘𝑌)
9	8	sseli 3979	. . . . . 6 ⊢ (𝑥 ∈ 𝐸 → 𝑥 ∈ (Base‘𝑌))
10		foelrn 7108	. . . . . 6 ⊢ (((ℤRHom‘𝑌):ℤ–onto→(Base‘𝑌) ∧ 𝑥 ∈ (Base‘𝑌)) → ∃𝑛 ∈ ℤ 𝑥 = ((ℤRHom‘𝑌)‘𝑛))
11	6, 9, 10	syl2an 597	. . . . 5 ⊢ ((𝑁 ∈ ℕ ∧ 𝑥 ∈ 𝐸) → ∃𝑛 ∈ ℤ 𝑥 = ((ℤRHom‘𝑌)‘𝑛))
12	11	ex 414	. . . 4 ⊢ (𝑁 ∈ ℕ → (𝑥 ∈ 𝐸 → ∃𝑛 ∈ ℤ 𝑥 = ((ℤRHom‘𝑌)‘𝑛)))
13		nncn 12220	. . . . . . . . . . . . . . . 16 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℂ)
14	13	ad2antrr 725	. . . . . . . . . . . . . . 15 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → 𝑁 ∈ ℂ)
15		simplr 768	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → 𝑛 ∈ ℤ)
16		nnz 12579	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℤ)
17	16	ad2antrr 725	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → 𝑁 ∈ ℤ)
18		nnne0 12246	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑁 ∈ ℕ → 𝑁 ≠ 0)
19	18	ad2antrr 725	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → 𝑁 ≠ 0)
20		simpr 486	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑛 = 0 ∧ 𝑁 = 0) → 𝑁 = 0)
21	20	necon3ai 2966	. . . . . . . . . . . . . . . . . 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 16443	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑛 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ ¬ (𝑛 = 0 ∧ 𝑁 = 0)) → (𝑛 gcd 𝑁) ∈ ℕ)
24	15, 17, 22, 23	syl21anc 837	. . . . . . . . . . . . . . . 16 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑛 gcd 𝑁) ∈ ℕ)
25	24	nncnd 12228	. . . . . . . . . . . . . . 15 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑛 gcd 𝑁) ∈ ℂ)
26	24	nnne0d 12262	. . . . . . . . . . . . . . 15 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑛 gcd 𝑁) ≠ 0)
27	14, 25, 26	divcan2d 11992	. . . . . . . . . . . . . 14 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((𝑛 gcd 𝑁) · (𝑁 / (𝑛 gcd 𝑁))) = 𝑁)
28		gcddvds 16444	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑛 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑛 gcd 𝑁) ∥ 𝑛 ∧ (𝑛 gcd 𝑁) ∥ 𝑁))
29	15, 17, 28	syl2anc 585	. . . . . . . . . . . . . . . 16 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((𝑛 gcd 𝑁) ∥ 𝑛 ∧ (𝑛 gcd 𝑁) ∥ 𝑁))
30	29	simpld 496	. . . . . . . . . . . . . . 15 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑛 gcd 𝑁) ∥ 𝑛)
31	24	nnzd 12585	. . . . . . . . . . . . . . . 16 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑛 gcd 𝑁) ∈ ℤ)
32	29	simprd 497	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑛 gcd 𝑁) ∥ 𝑁)
33		simpll 766	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → 𝑁 ∈ ℕ)
34		nndivdvds 16206	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑁 ∈ ℕ ∧ (𝑛 gcd 𝑁) ∈ ℕ) → ((𝑛 gcd 𝑁) ∥ 𝑁 ↔ (𝑁 / (𝑛 gcd 𝑁)) ∈ ℕ))
35	33, 24, 34	syl2anc 585	. . . . . . . . . . . . . . . . . 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 12585	. . . . . . . . . . . . . . . 16 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑁 / (𝑛 gcd 𝑁)) ∈ ℤ)
38		dvdsmulc 16227	. . . . . . . . . . . . . . . 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 1372	. . . . . . . . . . . . . . 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 5173	. . . . . . . . . . . . 13 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → 𝑁 ∥ (𝑛 · (𝑁 / (𝑛 gcd 𝑁))))
42		simpr 486	. . . . . . . . . . . . . . 15 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸)
43	1	ad2antrr 725	. . . . . . . . . . . . . . . . . 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 6806	. . . . . . . . . . . . . . . . 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 7088	. . . . . . . . . . . . . . 15 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((ℤRHom‘𝑌)‘(𝑁 / (𝑛 gcd 𝑁))) ∈ (Base‘𝑌))
48		eqid 2733	. . . . . . . . . . . . . . . 16 ⊢ (._r‘𝑌) = (._r‘𝑌)
49		eqid 2733	. . . . . . . . . . . . . . . 16 ⊢ (0_g‘𝑌) = (0_g‘𝑌)
50	7, 3, 48, 49	rrgeq0i 20905	. . . . . . . . . . . . . . 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 585	. . . . . . . . . . . . . 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 21100	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑁 ∈ ℕ₀ → 𝑌 ∈ CRing)
53	1, 52	syl 17	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑁 ∈ ℕ → 𝑌 ∈ CRing)
54		crngring 20068	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑌 ∈ CRing → 𝑌 ∈ Ring)
55	53, 54	syl 17	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑁 ∈ ℕ → 𝑌 ∈ Ring)
56	55	ad2antrr 725	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → 𝑌 ∈ Ring)
57	4	zrhrhm 21061	. . . . . . . . . . . . . . . . . 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 21023	. . . . . . . . . . . . . . . . . 18 ⊢ ℤ = (Base‘ℤ_ring)
60		zringmulr 21027	. . . . . . . . . . . . . . . . . 18 ⊢ · = (._r‘ℤ_ring)
61	59, 60, 48	rhmmul 20264	. . . . . . . . . . . . . . . . 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 1372	. . . . . . . . . . . . . . . 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 2735	. . . . . . . . . . . . . . 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 12672	. . . . . . . . . . . . . . . 16 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑛 · (𝑁 / (𝑛 gcd 𝑁))) ∈ ℤ)
65	2, 4, 49	zndvds0 21106	. . . . . . . . . . . . . . . 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 585	. . . . . . . . . . . . . . 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 281	. . . . . . . . . . . . . 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 21106	. . . . . . . . . . . . . . 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 585	. . . . . . . . . . . . . 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 293	. . . . . . . . . . . . 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 11991	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((𝑁 / (𝑛 gcd 𝑁)) · (𝑛 gcd 𝑁)) = 𝑁)
73	36	nncnd 12228	. . . . . . . . . . . . 13 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑁 / (𝑛 gcd 𝑁)) ∈ ℂ)
74	73	mulridd 11231	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((𝑁 / (𝑛 gcd 𝑁)) · 1) = (𝑁 / (𝑛 gcd 𝑁)))
75	71, 72, 74	3brtr4d 5181	. . . . . . . . . . 11 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((𝑁 / (𝑛 gcd 𝑁)) · (𝑛 gcd 𝑁)) ∥ ((𝑁 / (𝑛 gcd 𝑁)) · 1))
76		1zzd 12593	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → 1 ∈ ℤ)
77	36	nnne0d 12262	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑁 / (𝑛 gcd 𝑁)) ≠ 0)
78		dvdscmulr 16228	. . . . . . . . . . . 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 1375	. . . . . . . . . . 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 16449	. . . . . . . . . . 11 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (𝑛 gcd 𝑁) ∈ ℕ₀)
82		dvds1 16262	. . . . . . . . . . 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 21119	. . . . . . . . . 10 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑛 ∈ ℤ) → (((ℤRHom‘𝑌)‘𝑛) ∈ 𝑈 ↔ (𝑛 gcd 𝑁) = 1))
87	43, 15, 86	syl2anc 585	. . . . . . . . 9 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → (((ℤRHom‘𝑌)‘𝑛) ∈ 𝑈 ↔ (𝑛 gcd 𝑁) = 1))
88	84, 87	mpbird 257	. . . . . . . 8 ⊢ (((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) ∧ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸) → ((ℤRHom‘𝑌)‘𝑛) ∈ 𝑈)
89	88	ex 414	. . . . . . 7 ⊢ ((𝑁 ∈ ℕ ∧ 𝑛 ∈ ℤ) → (((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸 → ((ℤRHom‘𝑌)‘𝑛) ∈ 𝑈))
90		eleq1 2822	. . . . . . . 8 ⊢ (𝑥 = ((ℤRHom‘𝑌)‘𝑛) → (𝑥 ∈ 𝐸 ↔ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝐸))
91		eleq1 2822	. . . . . . . 8 ⊢ (𝑥 = ((ℤRHom‘𝑌)‘𝑛) → (𝑥 ∈ 𝑈 ↔ ((ℤRHom‘𝑌)‘𝑛) ∈ 𝑈))
92	90, 91	imbi12d 345	. . . . . . 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 3156	. . . . 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 3989	. 2 ⊢ (𝑁 ∈ ℕ → 𝐸 ⊆ 𝑈)
98	7, 85	unitrrg 20909	. . 3 ⊢ (𝑌 ∈ Ring → 𝑈 ⊆ 𝐸)
99	55, 98	syl 17	. 2 ⊢ (𝑁 ∈ ℕ → 𝑈 ⊆ 𝐸)
100	97, 99	eqssd 4000	1 ⊢ (𝑁 ∈ ℕ → 𝐸 = 𝑈)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 397 = wceq 1542 ∈ wcel 2107 ≠ wne 2941 ∃wrex 3071 ⊆ wss 3949 class class class wbr 5149 ⟶wf 6540 –onto→wfo 6542 ‘cfv 6544 (class class class)co 7409 ℂcc 11108 0cc0 11110 1c1 11111 · cmul 11115 / cdiv 11871 ℕcn 12212 ℕ₀cn0 12472 ℤcz 12558 ∥ cdvds 16197 gcd cgcd 16435 Basecbs 17144 ._rcmulr 17198 0_gc0g 17385 Ringcrg 20056 CRingccrg 20057 Unitcui 20169 RingHom crh 20248 RLRegcrlreg 20895 ℤ_ringczring 21017 ℤRHomczrh 21049 ℤ/nℤczn 21052

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 ax-cnex 11166 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186 ax-pre-mulgt0 11187 ax-pre-sup 11188 ax-addf 11189 ax-mulf 11190

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-tp 4634 df-op 4636 df-uni 4910 df-int 4952 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-riota 7365 df-ov 7412 df-oprab 7413 df-mpo 7414 df-om 7856 df-1st 7975 df-2nd 7976 df-tpos 8211 df-frecs 8266 df-wrecs 8297 df-recs 8371 df-rdg 8410 df-1o 8466 df-er 8703 df-ec 8705 df-qs 8709 df-map 8822 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-sup 9437 df-inf 9438 df-pnf 11250 df-mnf 11251 df-xr 11252 df-ltxr 11253 df-le 11254 df-sub 11446 df-neg 11447 df-div 11872 df-nn 12213 df-2 12275 df-3 12276 df-4 12277 df-5 12278 df-6 12279 df-7 12280 df-8 12281 df-9 12282 df-n0 12473 df-z 12559 df-dec 12678 df-uz 12823 df-rp 12975 df-fz 13485 df-fl 13757 df-mod 13835 df-seq 13967 df-exp 14028 df-cj 15046 df-re 15047 df-im 15048 df-sqrt 15182 df-abs 15183 df-dvds 16198 df-gcd 16436 df-struct 17080 df-sets 17097 df-slot 17115 df-ndx 17127 df-base 17145 df-ress 17174 df-plusg 17210 df-mulr 17211 df-starv 17212 df-sca 17213 df-vsca 17214 df-ip 17215 df-tset 17216 df-ple 17217 df-ds 17219 df-unif 17220 df-0g 17387 df-imas 17454 df-qus 17455 df-mgm 18561 df-sgrp 18610 df-mnd 18626 df-mhm 18671 df-grp 18822 df-minusg 18823 df-sbg 18824 df-mulg 18951 df-subg 19003 df-nsg 19004 df-eqg 19005 df-ghm 19090 df-cmn 19650 df-abl 19651 df-mgp 19988 df-ur 20005 df-ring 20058 df-cring 20059 df-oppr 20150 df-dvdsr 20171 df-unit 20172 df-invr 20202 df-rnghom 20251 df-subrg 20317 df-lmod 20473 df-lss 20543 df-lsp 20583 df-sra 20785 df-rgmod 20786 df-lidl 20787 df-rsp 20788 df-2idl 20857 df-rlreg 20899 df-cnfld 20945 df-zring 21018 df-zrh 21053 df-zn 21056

This theorem is referenced by: (None)

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