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Theorem ablfacrp 20016

Description: A finite abelian group whose order factors into relatively prime integers, itself "factors" into two subgroups 𝐾, 𝐿 that have trivial intersection and whose product is the whole group. Lemma 6.1C.2 of [Shapiro], p. 199. (Contributed by Mario Carneiro, 19-Apr-2016.)

**Hypotheses**
Ref	Expression
ablfacrp.b	⊢ 𝐵 = (Base‘𝐺)
ablfacrp.o	⊢ 𝑂 = (od‘𝐺)
ablfacrp.k	⊢ 𝐾 = {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑀}
ablfacrp.l	⊢ 𝐿 = {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁}
ablfacrp.g	⊢ (𝜑 → 𝐺 ∈ Abel)
ablfacrp.m	⊢ (𝜑 → 𝑀 ∈ ℕ)
ablfacrp.n	⊢ (𝜑 → 𝑁 ∈ ℕ)
ablfacrp.1	⊢ (𝜑 → (𝑀 gcd 𝑁) = 1)
ablfacrp.2	⊢ (𝜑 → (♯‘𝐵) = (𝑀 · 𝑁))
ablfacrp.z	⊢ 0 = (0_g‘𝐺)
ablfacrp.s	⊢ ⊕ = (LSSum‘𝐺)

**Assertion**
Ref	Expression
ablfacrp	⊢ (𝜑 → ((𝐾 ∩ 𝐿) = { 0 } ∧ (𝐾 ⊕ 𝐿) = 𝐵))

Distinct variable groups: 𝑥,𝐵 𝑥,𝐺 𝑥,𝑂 𝑥,𝑀 𝑥,𝑁 𝜑,𝑥 𝑥, 0 Allowed substitution hints: ⊕ (𝑥) 𝐾(𝑥) 𝐿(𝑥)

Proof of Theorem ablfacrp Dummy variables 𝑎 𝑏 𝑔 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		ablfacrp.k	. . . . . 6 ⊢ 𝐾 = {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑀}
2		ablfacrp.l	. . . . . 6 ⊢ 𝐿 = {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁}
3	1, 2	ineq12i 4206	. . . . 5 ⊢ (𝐾 ∩ 𝐿) = ({𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑀} ∩ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁})
4		inrab 4302	. . . . 5 ⊢ ({𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑀} ∩ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁}) = {𝑥 ∈ 𝐵 ∣ ((𝑂‘𝑥) ∥ 𝑀 ∧ (𝑂‘𝑥) ∥ 𝑁)}
5	3, 4	eqtri 2756	. . . 4 ⊢ (𝐾 ∩ 𝐿) = {𝑥 ∈ 𝐵 ∣ ((𝑂‘𝑥) ∥ 𝑀 ∧ (𝑂‘𝑥) ∥ 𝑁)}
6		ablfacrp.b	. . . . . . . . . . . . . 14 ⊢ 𝐵 = (Base‘𝐺)
7		ablfacrp.o	. . . . . . . . . . . . . 14 ⊢ 𝑂 = (od‘𝐺)
8	6, 7	odcl 19484	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ 𝐵 → (𝑂‘𝑥) ∈ ℕ₀)
9	8	adantl 481	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → (𝑂‘𝑥) ∈ ℕ₀)
10	9	nn0zd 12608	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → (𝑂‘𝑥) ∈ ℤ)
11		ablfacrp.m	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑀 ∈ ℕ)
12	11	nnzd 12609	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑀 ∈ ℤ)
13	12	adantr 480	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝑀 ∈ ℤ)
14		ablfacrp.n	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑁 ∈ ℕ)
15	14	nnzd 12609	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑁 ∈ ℤ)
16	15	adantr 480	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝑁 ∈ ℤ)
17		dvdsgcd 16513	. . . . . . . . . . 11 ⊢ (((𝑂‘𝑥) ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (((𝑂‘𝑥) ∥ 𝑀 ∧ (𝑂‘𝑥) ∥ 𝑁) → (𝑂‘𝑥) ∥ (𝑀 gcd 𝑁)))
18	10, 13, 16, 17	syl3anc 1369	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → (((𝑂‘𝑥) ∥ 𝑀 ∧ (𝑂‘𝑥) ∥ 𝑁) → (𝑂‘𝑥) ∥ (𝑀 gcd 𝑁)))
19	18	3impia 1115	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ ((𝑂‘𝑥) ∥ 𝑀 ∧ (𝑂‘𝑥) ∥ 𝑁)) → (𝑂‘𝑥) ∥ (𝑀 gcd 𝑁))
20		ablfacrp.1	. . . . . . . . . 10 ⊢ (𝜑 → (𝑀 gcd 𝑁) = 1)
21	20	3ad2ant1 1131	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ ((𝑂‘𝑥) ∥ 𝑀 ∧ (𝑂‘𝑥) ∥ 𝑁)) → (𝑀 gcd 𝑁) = 1)
22	19, 21	breqtrd 5168	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ ((𝑂‘𝑥) ∥ 𝑀 ∧ (𝑂‘𝑥) ∥ 𝑁)) → (𝑂‘𝑥) ∥ 1)
23		simp2 1135	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ ((𝑂‘𝑥) ∥ 𝑀 ∧ (𝑂‘𝑥) ∥ 𝑁)) → 𝑥 ∈ 𝐵)
24		dvds1 16289	. . . . . . . . 9 ⊢ ((𝑂‘𝑥) ∈ ℕ₀ → ((𝑂‘𝑥) ∥ 1 ↔ (𝑂‘𝑥) = 1))
25	23, 8, 24	3syl 18	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ ((𝑂‘𝑥) ∥ 𝑀 ∧ (𝑂‘𝑥) ∥ 𝑁)) → ((𝑂‘𝑥) ∥ 1 ↔ (𝑂‘𝑥) = 1))
26	22, 25	mpbid 231	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ ((𝑂‘𝑥) ∥ 𝑀 ∧ (𝑂‘𝑥) ∥ 𝑁)) → (𝑂‘𝑥) = 1)
27		ablfacrp.g	. . . . . . . . . 10 ⊢ (𝜑 → 𝐺 ∈ Abel)
28		ablgrp 19733	. . . . . . . . . 10 ⊢ (𝐺 ∈ Abel → 𝐺 ∈ Grp)
29	27, 28	syl 17	. . . . . . . . 9 ⊢ (𝜑 → 𝐺 ∈ Grp)
30	29	3ad2ant1 1131	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ ((𝑂‘𝑥) ∥ 𝑀 ∧ (𝑂‘𝑥) ∥ 𝑁)) → 𝐺 ∈ Grp)
31		ablfacrp.z	. . . . . . . . 9 ⊢ 0 = (0_g‘𝐺)
32	7, 31, 6	odeq1 19508	. . . . . . . 8 ⊢ ((𝐺 ∈ Grp ∧ 𝑥 ∈ 𝐵) → ((𝑂‘𝑥) = 1 ↔ 𝑥 = 0 ))
33	30, 23, 32	syl2anc 583	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ ((𝑂‘𝑥) ∥ 𝑀 ∧ (𝑂‘𝑥) ∥ 𝑁)) → ((𝑂‘𝑥) = 1 ↔ 𝑥 = 0 ))
34	26, 33	mpbid 231	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ ((𝑂‘𝑥) ∥ 𝑀 ∧ (𝑂‘𝑥) ∥ 𝑁)) → 𝑥 = 0 )
35		velsn 4640	. . . . . 6 ⊢ (𝑥 ∈ { 0 } ↔ 𝑥 = 0 )
36	34, 35	sylibr 233	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ ((𝑂‘𝑥) ∥ 𝑀 ∧ (𝑂‘𝑥) ∥ 𝑁)) → 𝑥 ∈ { 0 })
37	36	rabssdv 4068	. . . 4 ⊢ (𝜑 → {𝑥 ∈ 𝐵 ∣ ((𝑂‘𝑥) ∥ 𝑀 ∧ (𝑂‘𝑥) ∥ 𝑁)} ⊆ { 0 })
38	5, 37	eqsstrid 4026	. . 3 ⊢ (𝜑 → (𝐾 ∩ 𝐿) ⊆ { 0 })
39	7, 6	oddvdssubg 19803	. . . . . . . 8 ⊢ ((𝐺 ∈ Abel ∧ 𝑀 ∈ ℤ) → {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑀} ∈ (SubGrp‘𝐺))
40	27, 12, 39	syl2anc 583	. . . . . . 7 ⊢ (𝜑 → {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑀} ∈ (SubGrp‘𝐺))
41	1, 40	eqeltrid 2833	. . . . . 6 ⊢ (𝜑 → 𝐾 ∈ (SubGrp‘𝐺))
42	31	subg0cl 19082	. . . . . 6 ⊢ (𝐾 ∈ (SubGrp‘𝐺) → 0 ∈ 𝐾)
43	41, 42	syl 17	. . . . 5 ⊢ (𝜑 → 0 ∈ 𝐾)
44	7, 6	oddvdssubg 19803	. . . . . . . 8 ⊢ ((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) → {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ∈ (SubGrp‘𝐺))
45	27, 15, 44	syl2anc 583	. . . . . . 7 ⊢ (𝜑 → {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ∈ (SubGrp‘𝐺))
46	2, 45	eqeltrid 2833	. . . . . 6 ⊢ (𝜑 → 𝐿 ∈ (SubGrp‘𝐺))
47	31	subg0cl 19082	. . . . . 6 ⊢ (𝐿 ∈ (SubGrp‘𝐺) → 0 ∈ 𝐿)
48	46, 47	syl 17	. . . . 5 ⊢ (𝜑 → 0 ∈ 𝐿)
49	43, 48	elind 4190	. . . 4 ⊢ (𝜑 → 0 ∈ (𝐾 ∩ 𝐿))
50	49	snssd 4808	. . 3 ⊢ (𝜑 → { 0 } ⊆ (𝐾 ∩ 𝐿))
51	38, 50	eqssd 3995	. 2 ⊢ (𝜑 → (𝐾 ∩ 𝐿) = { 0 })
52		ablfacrp.s	. . . . . 6 ⊢ ⊕ = (LSSum‘𝐺)
53	52	lsmsubg2 19807	. . . . 5 ⊢ ((𝐺 ∈ Abel ∧ 𝐾 ∈ (SubGrp‘𝐺) ∧ 𝐿 ∈ (SubGrp‘𝐺)) → (𝐾 ⊕ 𝐿) ∈ (SubGrp‘𝐺))
54	27, 41, 46, 53	syl3anc 1369	. . . 4 ⊢ (𝜑 → (𝐾 ⊕ 𝐿) ∈ (SubGrp‘𝐺))
55	6	subgss 19075	. . . 4 ⊢ ((𝐾 ⊕ 𝐿) ∈ (SubGrp‘𝐺) → (𝐾 ⊕ 𝐿) ⊆ 𝐵)
56	54, 55	syl 17	. . 3 ⊢ (𝜑 → (𝐾 ⊕ 𝐿) ⊆ 𝐵)
57		eqid 2728	. . . . . 6 ⊢ (._g‘𝐺) = (._g‘𝐺)
58	6, 57	mulg1 19029	. . . . 5 ⊢ (𝑔 ∈ 𝐵 → (1(._g‘𝐺)𝑔) = 𝑔)
59	58	adantl 481	. . . 4 ⊢ ((𝜑 ∧ 𝑔 ∈ 𝐵) → (1(._g‘𝐺)𝑔) = 𝑔)
60		bezout 16512	. . . . . . 7 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ∃𝑎 ∈ ℤ ∃𝑏 ∈ ℤ (𝑀 gcd 𝑁) = ((𝑀 · 𝑎) + (𝑁 · 𝑏)))
61	12, 15, 60	syl2anc 583	. . . . . 6 ⊢ (𝜑 → ∃𝑎 ∈ ℤ ∃𝑏 ∈ ℤ (𝑀 gcd 𝑁) = ((𝑀 · 𝑎) + (𝑁 · 𝑏)))
62	61	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑔 ∈ 𝐵) → ∃𝑎 ∈ ℤ ∃𝑏 ∈ ℤ (𝑀 gcd 𝑁) = ((𝑀 · 𝑎) + (𝑁 · 𝑏)))
63	20	ad2antrr 725	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (𝑀 gcd 𝑁) = 1)
64	63	eqeq1d 2730	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → ((𝑀 gcd 𝑁) = ((𝑀 · 𝑎) + (𝑁 · 𝑏)) ↔ 1 = ((𝑀 · 𝑎) + (𝑁 · 𝑏))))
65	12	ad2antrr 725	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → 𝑀 ∈ ℤ)
66		simprl 770	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → 𝑎 ∈ ℤ)
67	65, 66	zmulcld 12696	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (𝑀 · 𝑎) ∈ ℤ)
68	67	zcnd 12691	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (𝑀 · 𝑎) ∈ ℂ)
69	15	ad2antrr 725	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → 𝑁 ∈ ℤ)
70		simprr 772	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → 𝑏 ∈ ℤ)
71	69, 70	zmulcld 12696	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (𝑁 · 𝑏) ∈ ℤ)
72	71	zcnd 12691	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (𝑁 · 𝑏) ∈ ℂ)
73	68, 72	addcomd 11440	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → ((𝑀 · 𝑎) + (𝑁 · 𝑏)) = ((𝑁 · 𝑏) + (𝑀 · 𝑎)))
74	73	oveq1d 7429	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (((𝑀 · 𝑎) + (𝑁 · 𝑏))(._g‘𝐺)𝑔) = (((𝑁 · 𝑏) + (𝑀 · 𝑎))(._g‘𝐺)𝑔))
75	29	ad2antrr 725	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → 𝐺 ∈ Grp)
76		simplr 768	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → 𝑔 ∈ 𝐵)
77		eqid 2728	. . . . . . . . . . . 12 ⊢ (+_g‘𝐺) = (+_g‘𝐺)
78	6, 57, 77	mulgdir 19054	. . . . . . . . . . 11 ⊢ ((𝐺 ∈ Grp ∧ ((𝑁 · 𝑏) ∈ ℤ ∧ (𝑀 · 𝑎) ∈ ℤ ∧ 𝑔 ∈ 𝐵)) → (((𝑁 · 𝑏) + (𝑀 · 𝑎))(._g‘𝐺)𝑔) = (((𝑁 · 𝑏)(._g‘𝐺)𝑔)(+_g‘𝐺)((𝑀 · 𝑎)(._g‘𝐺)𝑔)))
79	75, 71, 67, 76, 78	syl13anc 1370	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (((𝑁 · 𝑏) + (𝑀 · 𝑎))(._g‘𝐺)𝑔) = (((𝑁 · 𝑏)(._g‘𝐺)𝑔)(+_g‘𝐺)((𝑀 · 𝑎)(._g‘𝐺)𝑔)))
80	74, 79	eqtrd 2768	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (((𝑀 · 𝑎) + (𝑁 · 𝑏))(._g‘𝐺)𝑔) = (((𝑁 · 𝑏)(._g‘𝐺)𝑔)(+_g‘𝐺)((𝑀 · 𝑎)(._g‘𝐺)𝑔)))
81	41	ad2antrr 725	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → 𝐾 ∈ (SubGrp‘𝐺))
82	46	ad2antrr 725	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → 𝐿 ∈ (SubGrp‘𝐺))
83	6, 57	mulgcl 19039	. . . . . . . . . . . 12 ⊢ ((𝐺 ∈ Grp ∧ (𝑁 · 𝑏) ∈ ℤ ∧ 𝑔 ∈ 𝐵) → ((𝑁 · 𝑏)(._g‘𝐺)𝑔) ∈ 𝐵)
84	75, 71, 76, 83	syl3anc 1369	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → ((𝑁 · 𝑏)(._g‘𝐺)𝑔) ∈ 𝐵)
85	6, 7	odcl 19484	. . . . . . . . . . . . . . . 16 ⊢ (𝑔 ∈ 𝐵 → (𝑂‘𝑔) ∈ ℕ₀)
86	85	ad2antlr 726	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (𝑂‘𝑔) ∈ ℕ₀)
87	86	nn0zd 12608	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (𝑂‘𝑔) ∈ ℤ)
88	65, 69	zmulcld 12696	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (𝑀 · 𝑁) ∈ ℤ)
89		ablfacrp.2	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝜑 → (♯‘𝐵) = (𝑀 · 𝑁))
90	11, 14	nnmulcld 12289	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝜑 → (𝑀 · 𝑁) ∈ ℕ)
91	90	nnnn0d 12556	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝜑 → (𝑀 · 𝑁) ∈ ℕ₀)
92	89, 91	eqeltrd 2829	. . . . . . . . . . . . . . . . . 18 ⊢ (𝜑 → (♯‘𝐵) ∈ ℕ₀)
93	6	fvexi 6905	. . . . . . . . . . . . . . . . . . 19 ⊢ 𝐵 ∈ V
94		hashclb 14343	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝐵 ∈ V → (𝐵 ∈ Fin ↔ (♯‘𝐵) ∈ ℕ₀))
95	93, 94	ax-mp 5	. . . . . . . . . . . . . . . . . 18 ⊢ (𝐵 ∈ Fin ↔ (♯‘𝐵) ∈ ℕ₀)
96	92, 95	sylibr 233	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → 𝐵 ∈ Fin)
97	96	ad2antrr 725	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → 𝐵 ∈ Fin)
98	6, 7	oddvds2 19514	. . . . . . . . . . . . . . . 16 ⊢ ((𝐺 ∈ Grp ∧ 𝐵 ∈ Fin ∧ 𝑔 ∈ 𝐵) → (𝑂‘𝑔) ∥ (♯‘𝐵))
99	75, 97, 76, 98	syl3anc 1369	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (𝑂‘𝑔) ∥ (♯‘𝐵))
100	89	ad2antrr 725	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (♯‘𝐵) = (𝑀 · 𝑁))
101	99, 100	breqtrd 5168	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (𝑂‘𝑔) ∥ (𝑀 · 𝑁))
102	87, 88, 70, 101	dvdsmultr1d 16267	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (𝑂‘𝑔) ∥ ((𝑀 · 𝑁) · 𝑏))
103	65	zcnd 12691	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → 𝑀 ∈ ℂ)
104	69	zcnd 12691	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → 𝑁 ∈ ℂ)
105	70	zcnd 12691	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → 𝑏 ∈ ℂ)
106	103, 104, 105	mulassd 11261	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → ((𝑀 · 𝑁) · 𝑏) = (𝑀 · (𝑁 · 𝑏)))
107	102, 106	breqtrd 5168	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (𝑂‘𝑔) ∥ (𝑀 · (𝑁 · 𝑏)))
108	6, 7, 57	odmulgid 19502	. . . . . . . . . . . . 13 ⊢ (((𝐺 ∈ Grp ∧ 𝑔 ∈ 𝐵 ∧ (𝑁 · 𝑏) ∈ ℤ) ∧ 𝑀 ∈ ℤ) → ((𝑂‘((𝑁 · 𝑏)(._g‘𝐺)𝑔)) ∥ 𝑀 ↔ (𝑂‘𝑔) ∥ (𝑀 · (𝑁 · 𝑏))))
109	75, 76, 71, 65, 108	syl31anc 1371	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → ((𝑂‘((𝑁 · 𝑏)(._g‘𝐺)𝑔)) ∥ 𝑀 ↔ (𝑂‘𝑔) ∥ (𝑀 · (𝑁 · 𝑏))))
110	107, 109	mpbird 257	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (𝑂‘((𝑁 · 𝑏)(._g‘𝐺)𝑔)) ∥ 𝑀)
111		fveq2 6891	. . . . . . . . . . . . 13 ⊢ (𝑥 = ((𝑁 · 𝑏)(._g‘𝐺)𝑔) → (𝑂‘𝑥) = (𝑂‘((𝑁 · 𝑏)(._g‘𝐺)𝑔)))
112	111	breq1d 5152	. . . . . . . . . . . 12 ⊢ (𝑥 = ((𝑁 · 𝑏)(._g‘𝐺)𝑔) → ((𝑂‘𝑥) ∥ 𝑀 ↔ (𝑂‘((𝑁 · 𝑏)(._g‘𝐺)𝑔)) ∥ 𝑀))
113	112, 1	elrab2 3684	. . . . . . . . . . 11 ⊢ (((𝑁 · 𝑏)(._g‘𝐺)𝑔) ∈ 𝐾 ↔ (((𝑁 · 𝑏)(._g‘𝐺)𝑔) ∈ 𝐵 ∧ (𝑂‘((𝑁 · 𝑏)(._g‘𝐺)𝑔)) ∥ 𝑀))
114	84, 110, 113	sylanbrc 582	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → ((𝑁 · 𝑏)(._g‘𝐺)𝑔) ∈ 𝐾)
115	6, 57	mulgcl 19039	. . . . . . . . . . . 12 ⊢ ((𝐺 ∈ Grp ∧ (𝑀 · 𝑎) ∈ ℤ ∧ 𝑔 ∈ 𝐵) → ((𝑀 · 𝑎)(._g‘𝐺)𝑔) ∈ 𝐵)
116	75, 67, 76, 115	syl3anc 1369	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → ((𝑀 · 𝑎)(._g‘𝐺)𝑔) ∈ 𝐵)
117	87, 88, 66, 101	dvdsmultr1d 16267	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (𝑂‘𝑔) ∥ ((𝑀 · 𝑁) · 𝑎))
118		zcn 12587	. . . . . . . . . . . . . . 15 ⊢ (𝑎 ∈ ℤ → 𝑎 ∈ ℂ)
119	118	ad2antrl 727	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → 𝑎 ∈ ℂ)
120		mulass 11220	. . . . . . . . . . . . . . 15 ⊢ ((𝑀 ∈ ℂ ∧ 𝑁 ∈ ℂ ∧ 𝑎 ∈ ℂ) → ((𝑀 · 𝑁) · 𝑎) = (𝑀 · (𝑁 · 𝑎)))
121		mul12 11403	. . . . . . . . . . . . . . 15 ⊢ ((𝑀 ∈ ℂ ∧ 𝑁 ∈ ℂ ∧ 𝑎 ∈ ℂ) → (𝑀 · (𝑁 · 𝑎)) = (𝑁 · (𝑀 · 𝑎)))
122	120, 121	eqtrd 2768	. . . . . . . . . . . . . 14 ⊢ ((𝑀 ∈ ℂ ∧ 𝑁 ∈ ℂ ∧ 𝑎 ∈ ℂ) → ((𝑀 · 𝑁) · 𝑎) = (𝑁 · (𝑀 · 𝑎)))
123	103, 104, 119, 122	syl3anc 1369	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → ((𝑀 · 𝑁) · 𝑎) = (𝑁 · (𝑀 · 𝑎)))
124	117, 123	breqtrd 5168	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (𝑂‘𝑔) ∥ (𝑁 · (𝑀 · 𝑎)))
125	6, 7, 57	odmulgid 19502	. . . . . . . . . . . . 13 ⊢ (((𝐺 ∈ Grp ∧ 𝑔 ∈ 𝐵 ∧ (𝑀 · 𝑎) ∈ ℤ) ∧ 𝑁 ∈ ℤ) → ((𝑂‘((𝑀 · 𝑎)(._g‘𝐺)𝑔)) ∥ 𝑁 ↔ (𝑂‘𝑔) ∥ (𝑁 · (𝑀 · 𝑎))))
126	75, 76, 67, 69, 125	syl31anc 1371	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → ((𝑂‘((𝑀 · 𝑎)(._g‘𝐺)𝑔)) ∥ 𝑁 ↔ (𝑂‘𝑔) ∥ (𝑁 · (𝑀 · 𝑎))))
127	124, 126	mpbird 257	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (𝑂‘((𝑀 · 𝑎)(._g‘𝐺)𝑔)) ∥ 𝑁)
128		fveq2 6891	. . . . . . . . . . . . 13 ⊢ (𝑥 = ((𝑀 · 𝑎)(._g‘𝐺)𝑔) → (𝑂‘𝑥) = (𝑂‘((𝑀 · 𝑎)(._g‘𝐺)𝑔)))
129	128	breq1d 5152	. . . . . . . . . . . 12 ⊢ (𝑥 = ((𝑀 · 𝑎)(._g‘𝐺)𝑔) → ((𝑂‘𝑥) ∥ 𝑁 ↔ (𝑂‘((𝑀 · 𝑎)(._g‘𝐺)𝑔)) ∥ 𝑁))
130	129, 2	elrab2 3684	. . . . . . . . . . 11 ⊢ (((𝑀 · 𝑎)(._g‘𝐺)𝑔) ∈ 𝐿 ↔ (((𝑀 · 𝑎)(._g‘𝐺)𝑔) ∈ 𝐵 ∧ (𝑂‘((𝑀 · 𝑎)(._g‘𝐺)𝑔)) ∥ 𝑁))
131	116, 127, 130	sylanbrc 582	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → ((𝑀 · 𝑎)(._g‘𝐺)𝑔) ∈ 𝐿)
132	77, 52	lsmelvali 19598	. . . . . . . . . 10 ⊢ (((𝐾 ∈ (SubGrp‘𝐺) ∧ 𝐿 ∈ (SubGrp‘𝐺)) ∧ (((𝑁 · 𝑏)(._g‘𝐺)𝑔) ∈ 𝐾 ∧ ((𝑀 · 𝑎)(._g‘𝐺)𝑔) ∈ 𝐿)) → (((𝑁 · 𝑏)(._g‘𝐺)𝑔)(+_g‘𝐺)((𝑀 · 𝑎)(._g‘𝐺)𝑔)) ∈ (𝐾 ⊕ 𝐿))
133	81, 82, 114, 131, 132	syl22anc 838	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (((𝑁 · 𝑏)(._g‘𝐺)𝑔)(+_g‘𝐺)((𝑀 · 𝑎)(._g‘𝐺)𝑔)) ∈ (𝐾 ⊕ 𝐿))
134	80, 133	eqeltrd 2829	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (((𝑀 · 𝑎) + (𝑁 · 𝑏))(._g‘𝐺)𝑔) ∈ (𝐾 ⊕ 𝐿))
135		oveq1 7421	. . . . . . . . 9 ⊢ (1 = ((𝑀 · 𝑎) + (𝑁 · 𝑏)) → (1(._g‘𝐺)𝑔) = (((𝑀 · 𝑎) + (𝑁 · 𝑏))(._g‘𝐺)𝑔))
136	135	eleq1d 2814	. . . . . . . 8 ⊢ (1 = ((𝑀 · 𝑎) + (𝑁 · 𝑏)) → ((1(._g‘𝐺)𝑔) ∈ (𝐾 ⊕ 𝐿) ↔ (((𝑀 · 𝑎) + (𝑁 · 𝑏))(._g‘𝐺)𝑔) ∈ (𝐾 ⊕ 𝐿)))
137	134, 136	syl5ibrcom 246	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → (1 = ((𝑀 · 𝑎) + (𝑁 · 𝑏)) → (1(._g‘𝐺)𝑔) ∈ (𝐾 ⊕ 𝐿)))
138	64, 137	sylbid 239	. . . . . 6 ⊢ (((𝜑 ∧ 𝑔 ∈ 𝐵) ∧ (𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ)) → ((𝑀 gcd 𝑁) = ((𝑀 · 𝑎) + (𝑁 · 𝑏)) → (1(._g‘𝐺)𝑔) ∈ (𝐾 ⊕ 𝐿)))
139	138	rexlimdvva 3207	. . . . 5 ⊢ ((𝜑 ∧ 𝑔 ∈ 𝐵) → (∃𝑎 ∈ ℤ ∃𝑏 ∈ ℤ (𝑀 gcd 𝑁) = ((𝑀 · 𝑎) + (𝑁 · 𝑏)) → (1(._g‘𝐺)𝑔) ∈ (𝐾 ⊕ 𝐿)))
140	62, 139	mpd 15	. . . 4 ⊢ ((𝜑 ∧ 𝑔 ∈ 𝐵) → (1(._g‘𝐺)𝑔) ∈ (𝐾 ⊕ 𝐿))
141	59, 140	eqeltrrd 2830	. . 3 ⊢ ((𝜑 ∧ 𝑔 ∈ 𝐵) → 𝑔 ∈ (𝐾 ⊕ 𝐿))
142	56, 141	eqelssd 3999	. 2 ⊢ (𝜑 → (𝐾 ⊕ 𝐿) = 𝐵)
143	51, 142	jca 511	1 ⊢ (𝜑 → ((𝐾 ∩ 𝐿) = { 0 } ∧ (𝐾 ⊕ 𝐿) = 𝐵))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1085 = wceq 1534 ∈ wcel 2099 ∃wrex 3066 {crab 3428 Vcvv 3470 ∩ cin 3944 ⊆ wss 3945 {csn 4624 class class class wbr 5142 ‘cfv 6542 (class class class)co 7414 Fincfn 8957 ℂcc 11130 1c1 11133 + caddc 11135 · cmul 11137 ℕcn 12236 ℕ₀cn0 12496 ℤcz 12582 ♯chash 14315 ∥ cdvds 16224 gcd cgcd 16462 Basecbs 17173 +_gcplusg 17226 0_gc0g 17414 Grpcgrp 18883 ._gcmg 19016 SubGrpcsubg 19068 odcod 19472 LSSumclsm 19582 Abelcabl 19729

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-rep 5279 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-inf2 9658 ax-cnex 11188 ax-resscn 11189 ax-1cn 11190 ax-icn 11191 ax-addcl 11192 ax-addrcl 11193 ax-mulcl 11194 ax-mulrcl 11195 ax-mulcom 11196 ax-addass 11197 ax-mulass 11198 ax-distr 11199 ax-i2m1 11200 ax-1ne0 11201 ax-1rid 11202 ax-rnegex 11203 ax-rrecex 11204 ax-cnre 11205 ax-pre-lttri 11206 ax-pre-lttrn 11207 ax-pre-ltadd 11208 ax-pre-mulgt0 11209 ax-pre-sup 11210

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-rmo 3372 df-reu 3373 df-rab 3429 df-v 3472 df-sbc 3776 df-csb 3891 df-dif 3948 df-un 3950 df-in 3952 df-ss 3962 df-pss 3964 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-int 4945 df-iun 4993 df-disj 5108 df-br 5143 df-opab 5205 df-mpt 5226 df-tr 5260 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-se 5628 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-pred 6299 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-isom 6551 df-riota 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 df-om 7865 df-1st 7987 df-2nd 7988 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-1o 8480 df-oadd 8484 df-omul 8485 df-er 8718 df-ec 8720 df-qs 8724 df-map 8840 df-en 8958 df-dom 8959 df-sdom 8960 df-fin 8961 df-sup 9459 df-inf 9460 df-oi 9527 df-card 9956 df-acn 9959 df-pnf 11274 df-mnf 11275 df-xr 11276 df-ltxr 11277 df-le 11278 df-sub 11470 df-neg 11471 df-div 11896 df-nn 12237 df-2 12299 df-3 12300 df-n0 12497 df-z 12583 df-uz 12847 df-rp 13001 df-fz 13511 df-fzo 13654 df-fl 13783 df-mod 13861 df-seq 13993 df-exp 14053 df-hash 14316 df-cj 15072 df-re 15073 df-im 15074 df-sqrt 15208 df-abs 15209 df-clim 15458 df-sum 15659 df-dvds 16225 df-gcd 16463 df-sets 17126 df-slot 17144 df-ndx 17156 df-base 17174 df-ress 17203 df-plusg 17239 df-0g 17416 df-mgm 18593 df-sgrp 18672 df-mnd 18688 df-submnd 18734 df-grp 18886 df-minusg 18887 df-sbg 18888 df-mulg 19017 df-subg 19071 df-eqg 19073 df-cntz 19261 df-od 19476 df-lsm 19584 df-cmn 19730 df-abl 19731

This theorem is referenced by: ablfacrp2 20017 ablfac1b 20020

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