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Theorem fsumdvdscom 27091

Description: A double commutation of divisor sums based on fsumdvdsdiag 27090. Note that 𝐴 depends on both 𝑗 and 𝑘. (Contributed by Mario Carneiro, 13-May-2016.)

**Hypotheses**
Ref	Expression
fsumdvdscom.1	⊢ (𝜑 → 𝑁 ∈ ℕ)
fsumdvdscom.2	⊢ (𝑗 = (𝑘 · 𝑚) → 𝐴 = 𝐵)
fsumdvdscom.3	⊢ ((𝜑 ∧ (𝑗 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑗})) → 𝐴 ∈ ℂ)

**Assertion**
Ref	Expression
fsumdvdscom	⊢ (𝜑 → Σ𝑗 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑗}𝐴 = Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}Σ𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}𝐵)

Distinct variable groups: 𝐴,𝑚 𝐵,𝑗 𝑗,𝑘,𝑚,𝑥,𝑁 𝜑,𝑗,𝑘,𝑚 Allowed substitution hints: 𝜑(𝑥) 𝐴(𝑥,𝑗,𝑘) 𝐵(𝑥,𝑘,𝑚)

Proof of Theorem fsumdvdscom Dummy variables 𝑢 𝑣 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		nfcv 2898	. . 3 ⊢ Ⅎ𝑢Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑗}𝐴
2		nfcv 2898	. . . 4 ⊢ Ⅎ𝑗{𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢}
3		nfcsb1v 3914	. . . 4 ⊢ Ⅎ𝑗⦋𝑢 / 𝑗⦌𝐴
4	2, 3	nfsum 15655	. . 3 ⊢ Ⅎ𝑗Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢}⦋𝑢 / 𝑗⦌𝐴
5		breq2 5146	. . . . 5 ⊢ (𝑗 = 𝑢 → (𝑥 ∥ 𝑗 ↔ 𝑥 ∥ 𝑢))
6	5	rabbidv 3435	. . . 4 ⊢ (𝑗 = 𝑢 → {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑗} = {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢})
7		csbeq1a 3903	. . . . 5 ⊢ (𝑗 = 𝑢 → 𝐴 = ⦋𝑢 / 𝑗⦌𝐴)
8	7	adantr 480	. . . 4 ⊢ ((𝑗 = 𝑢 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑗}) → 𝐴 = ⦋𝑢 / 𝑗⦌𝐴)
9	6, 8	sumeq12dv 15670	. . 3 ⊢ (𝑗 = 𝑢 → Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑗}𝐴 = Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢}⦋𝑢 / 𝑗⦌𝐴)
10	1, 4, 9	cbvsumi 15661	. 2 ⊢ Σ𝑗 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑗}𝐴 = Σ𝑢 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢}⦋𝑢 / 𝑗⦌𝐴
11		breq2 5146	. . . . . 6 ⊢ (𝑢 = (𝑁 / 𝑣) → (𝑥 ∥ 𝑢 ↔ 𝑥 ∥ (𝑁 / 𝑣)))
12	11	rabbidv 3435	. . . . 5 ⊢ (𝑢 = (𝑁 / 𝑣) → {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢} = {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑣)})
13		csbeq1 3892	. . . . . 6 ⊢ (𝑢 = (𝑁 / 𝑣) → ⦋𝑢 / 𝑗⦌𝐴 = ⦋(𝑁 / 𝑣) / 𝑗⦌𝐴)
14	13	adantr 480	. . . . 5 ⊢ ((𝑢 = (𝑁 / 𝑣) ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢}) → ⦋𝑢 / 𝑗⦌𝐴 = ⦋(𝑁 / 𝑣) / 𝑗⦌𝐴)
15	12, 14	sumeq12dv 15670	. . . 4 ⊢ (𝑢 = (𝑁 / 𝑣) → Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢}⦋𝑢 / 𝑗⦌𝐴 = Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑣)}⦋(𝑁 / 𝑣) / 𝑗⦌𝐴)
16		fzfid 13956	. . . . 5 ⊢ (𝜑 → (1...𝑁) ∈ Fin)
17		fsumdvdscom.1	. . . . . 6 ⊢ (𝜑 → 𝑁 ∈ ℕ)
18		dvdsssfz1 16280	. . . . . 6 ⊢ (𝑁 ∈ ℕ → {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} ⊆ (1...𝑁))
19	17, 18	syl 17	. . . . 5 ⊢ (𝜑 → {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} ⊆ (1...𝑁))
20	16, 19	ssfid 9281	. . . 4 ⊢ (𝜑 → {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} ∈ Fin)
21		eqid 2727	. . . . . 6 ⊢ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} = {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}
22		eqid 2727	. . . . . 6 ⊢ (𝑧 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} ↦ (𝑁 / 𝑧)) = (𝑧 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} ↦ (𝑁 / 𝑧))
23	21, 22	dvdsflip 16279	. . . . 5 ⊢ (𝑁 ∈ ℕ → (𝑧 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} ↦ (𝑁 / 𝑧)):{𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}–1-1-onto→{𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁})
24	17, 23	syl 17	. . . 4 ⊢ (𝜑 → (𝑧 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} ↦ (𝑁 / 𝑧)):{𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}–1-1-onto→{𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁})
25		oveq2 7422	. . . . . 6 ⊢ (𝑧 = 𝑣 → (𝑁 / 𝑧) = (𝑁 / 𝑣))
26		ovex 7447	. . . . . 6 ⊢ (𝑁 / 𝑧) ∈ V
27	25, 22, 26	fvmpt3i 7004	. . . . 5 ⊢ (𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} → ((𝑧 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} ↦ (𝑁 / 𝑧))‘𝑣) = (𝑁 / 𝑣))
28	27	adantl 481	. . . 4 ⊢ ((𝜑 ∧ 𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → ((𝑧 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} ↦ (𝑁 / 𝑧))‘𝑣) = (𝑁 / 𝑣))
29		fzfid 13956	. . . . . 6 ⊢ ((𝜑 ∧ 𝑢 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → (1...𝑢) ∈ Fin)
30		ssrab2 4073	. . . . . . . 8 ⊢ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} ⊆ ℕ
31		simpr 484	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑢 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → 𝑢 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁})
32	30, 31	sselid 3976	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑢 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → 𝑢 ∈ ℕ)
33		dvdsssfz1 16280	. . . . . . 7 ⊢ (𝑢 ∈ ℕ → {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢} ⊆ (1...𝑢))
34	32, 33	syl 17	. . . . . 6 ⊢ ((𝜑 ∧ 𝑢 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢} ⊆ (1...𝑢))
35	29, 34	ssfid 9281	. . . . 5 ⊢ ((𝜑 ∧ 𝑢 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢} ∈ Fin)
36		fsumdvdscom.3	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑗 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑗})) → 𝐴 ∈ ℂ)
37	36	ralrimivva 3195	. . . . . . . 8 ⊢ (𝜑 → ∀𝑗 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}∀𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑗}𝐴 ∈ ℂ)
38		nfv 1910	. . . . . . . . 9 ⊢ Ⅎ𝑢∀𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑗}𝐴 ∈ ℂ
39	3	nfel1 2914	. . . . . . . . . 10 ⊢ Ⅎ𝑗⦋𝑢 / 𝑗⦌𝐴 ∈ ℂ
40	2, 39	nfralw 3303	. . . . . . . . 9 ⊢ Ⅎ𝑗∀𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢}⦋𝑢 / 𝑗⦌𝐴 ∈ ℂ
41	7	eleq1d 2813	. . . . . . . . . 10 ⊢ (𝑗 = 𝑢 → (𝐴 ∈ ℂ ↔ ⦋𝑢 / 𝑗⦌𝐴 ∈ ℂ))
42	6, 41	raleqbidv 3337	. . . . . . . . 9 ⊢ (𝑗 = 𝑢 → (∀𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑗}𝐴 ∈ ℂ ↔ ∀𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢}⦋𝑢 / 𝑗⦌𝐴 ∈ ℂ))
43	38, 40, 42	cbvralw 3298	. . . . . . . 8 ⊢ (∀𝑗 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}∀𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑗}𝐴 ∈ ℂ ↔ ∀𝑢 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}∀𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢}⦋𝑢 / 𝑗⦌𝐴 ∈ ℂ)
44	37, 43	sylib 217	. . . . . . 7 ⊢ (𝜑 → ∀𝑢 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}∀𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢}⦋𝑢 / 𝑗⦌𝐴 ∈ ℂ)
45	44	r19.21bi 3243	. . . . . 6 ⊢ ((𝜑 ∧ 𝑢 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → ∀𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢}⦋𝑢 / 𝑗⦌𝐴 ∈ ℂ)
46	45	r19.21bi 3243	. . . . 5 ⊢ (((𝜑 ∧ 𝑢 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢}) → ⦋𝑢 / 𝑗⦌𝐴 ∈ ℂ)
47	35, 46	fsumcl 15697	. . . 4 ⊢ ((𝜑 ∧ 𝑢 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢}⦋𝑢 / 𝑗⦌𝐴 ∈ ℂ)
48	15, 20, 24, 28, 47	fsumf1o 15687	. . 3 ⊢ (𝜑 → Σ𝑢 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢}⦋𝑢 / 𝑗⦌𝐴 = Σ𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑣)}⦋(𝑁 / 𝑣) / 𝑗⦌𝐴)
49	13	eleq1d 2813	. . . . . . . 8 ⊢ (𝑢 = (𝑁 / 𝑣) → (⦋𝑢 / 𝑗⦌𝐴 ∈ ℂ ↔ ⦋(𝑁 / 𝑣) / 𝑗⦌𝐴 ∈ ℂ))
50	12, 49	raleqbidv 3337	. . . . . . 7 ⊢ (𝑢 = (𝑁 / 𝑣) → (∀𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢}⦋𝑢 / 𝑗⦌𝐴 ∈ ℂ ↔ ∀𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑣)}⦋(𝑁 / 𝑣) / 𝑗⦌𝐴 ∈ ℂ))
51	44	adantr 480	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → ∀𝑢 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}∀𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢}⦋𝑢 / 𝑗⦌𝐴 ∈ ℂ)
52		dvdsdivcl 16278	. . . . . . . 8 ⊢ ((𝑁 ∈ ℕ ∧ 𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → (𝑁 / 𝑣) ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁})
53	17, 52	sylan 579	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → (𝑁 / 𝑣) ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁})
54	50, 51, 53	rspcdva 3608	. . . . . 6 ⊢ ((𝜑 ∧ 𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → ∀𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑣)}⦋(𝑁 / 𝑣) / 𝑗⦌𝐴 ∈ ℂ)
55	54	r19.21bi 3243	. . . . 5 ⊢ (((𝜑 ∧ 𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑣)}) → ⦋(𝑁 / 𝑣) / 𝑗⦌𝐴 ∈ ℂ)
56	55	anasss 466	. . . 4 ⊢ ((𝜑 ∧ (𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑣)})) → ⦋(𝑁 / 𝑣) / 𝑗⦌𝐴 ∈ ℂ)
57	17, 56	fsumdvdsdiag 27090	. . 3 ⊢ (𝜑 → Σ𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑣)}⦋(𝑁 / 𝑣) / 𝑗⦌𝐴 = Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}Σ𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}⦋(𝑁 / 𝑣) / 𝑗⦌𝐴)
58		oveq2 7422	. . . . . . 7 ⊢ (𝑣 = ((𝑁 / 𝑘) / 𝑚) → (𝑁 / 𝑣) = (𝑁 / ((𝑁 / 𝑘) / 𝑚)))
59	58	csbeq1d 3893	. . . . . 6 ⊢ (𝑣 = ((𝑁 / 𝑘) / 𝑚) → ⦋(𝑁 / 𝑣) / 𝑗⦌𝐴 = ⦋(𝑁 / ((𝑁 / 𝑘) / 𝑚)) / 𝑗⦌𝐴)
60		fzfid 13956	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → (1...(𝑁 / 𝑘)) ∈ Fin)
61		dvdsdivcl 16278	. . . . . . . . . 10 ⊢ ((𝑁 ∈ ℕ ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → (𝑁 / 𝑘) ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁})
62	30, 61	sselid 3976	. . . . . . . . 9 ⊢ ((𝑁 ∈ ℕ ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → (𝑁 / 𝑘) ∈ ℕ)
63	17, 62	sylan 579	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → (𝑁 / 𝑘) ∈ ℕ)
64		dvdsssfz1 16280	. . . . . . . 8 ⊢ ((𝑁 / 𝑘) ∈ ℕ → {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)} ⊆ (1...(𝑁 / 𝑘)))
65	63, 64	syl 17	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)} ⊆ (1...(𝑁 / 𝑘)))
66	60, 65	ssfid 9281	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)} ∈ Fin)
67		eqid 2727	. . . . . . . 8 ⊢ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)} = {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}
68		eqid 2727	. . . . . . . 8 ⊢ (𝑧 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)} ↦ ((𝑁 / 𝑘) / 𝑧)) = (𝑧 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)} ↦ ((𝑁 / 𝑘) / 𝑧))
69	67, 68	dvdsflip 16279	. . . . . . 7 ⊢ ((𝑁 / 𝑘) ∈ ℕ → (𝑧 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)} ↦ ((𝑁 / 𝑘) / 𝑧)):{𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}–1-1-onto→{𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)})
70	63, 69	syl 17	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → (𝑧 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)} ↦ ((𝑁 / 𝑘) / 𝑧)):{𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}–1-1-onto→{𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)})
71		oveq2 7422	. . . . . . . 8 ⊢ (𝑧 = 𝑚 → ((𝑁 / 𝑘) / 𝑧) = ((𝑁 / 𝑘) / 𝑚))
72		ovex 7447	. . . . . . . 8 ⊢ ((𝑁 / 𝑘) / 𝑧) ∈ V
73	71, 68, 72	fvmpt3i 7004	. . . . . . 7 ⊢ (𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)} → ((𝑧 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)} ↦ ((𝑁 / 𝑘) / 𝑧))‘𝑚) = ((𝑁 / 𝑘) / 𝑚))
74	73	adantl 481	. . . . . 6 ⊢ (((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → ((𝑧 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)} ↦ ((𝑁 / 𝑘) / 𝑧))‘𝑚) = ((𝑁 / 𝑘) / 𝑚))
75	17	fsumdvdsdiaglem 27089	. . . . . . . 8 ⊢ (𝜑 → ((𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} ∧ 𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → (𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑣)})))
76	56	ex 412	. . . . . . . 8 ⊢ (𝜑 → ((𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑣)}) → ⦋(𝑁 / 𝑣) / 𝑗⦌𝐴 ∈ ℂ))
77	75, 76	syld 47	. . . . . . 7 ⊢ (𝜑 → ((𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} ∧ 𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → ⦋(𝑁 / 𝑣) / 𝑗⦌𝐴 ∈ ℂ))
78	77	impl 455	. . . . . 6 ⊢ (((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → ⦋(𝑁 / 𝑣) / 𝑗⦌𝐴 ∈ ℂ)
79	59, 66, 70, 74, 78	fsumf1o 15687	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → Σ𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}⦋(𝑁 / 𝑣) / 𝑗⦌𝐴 = Σ𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}⦋(𝑁 / ((𝑁 / 𝑘) / 𝑚)) / 𝑗⦌𝐴)
80		ovexd 7449	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → (𝑁 / ((𝑁 / 𝑘) / 𝑚)) ∈ V)
81		nncn 12236	. . . . . . . . . . . . . . . . 17 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℂ)
82		nnne0 12262	. . . . . . . . . . . . . . . . 17 ⊢ (𝑁 ∈ ℕ → 𝑁 ≠ 0)
83	81, 82	jca 511	. . . . . . . . . . . . . . . 16 ⊢ (𝑁 ∈ ℕ → (𝑁 ∈ ℂ ∧ 𝑁 ≠ 0))
84	17, 83	syl 17	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (𝑁 ∈ ℂ ∧ 𝑁 ≠ 0))
85	84	ad2antrr 725	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → (𝑁 ∈ ℂ ∧ 𝑁 ≠ 0))
86	85	simpld 494	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → 𝑁 ∈ ℂ)
87		elrabi 3674	. . . . . . . . . . . . . . . 16 ⊢ (𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} → 𝑘 ∈ ℕ)
88	87	adantl 481	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → 𝑘 ∈ ℕ)
89	88	adantr 480	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → 𝑘 ∈ ℕ)
90		nncn 12236	. . . . . . . . . . . . . . 15 ⊢ (𝑘 ∈ ℕ → 𝑘 ∈ ℂ)
91		nnne0 12262	. . . . . . . . . . . . . . 15 ⊢ (𝑘 ∈ ℕ → 𝑘 ≠ 0)
92	90, 91	jca 511	. . . . . . . . . . . . . 14 ⊢ (𝑘 ∈ ℕ → (𝑘 ∈ ℂ ∧ 𝑘 ≠ 0))
93	89, 92	syl 17	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → (𝑘 ∈ ℂ ∧ 𝑘 ≠ 0))
94		elrabi 3674	. . . . . . . . . . . . . . 15 ⊢ (𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)} → 𝑚 ∈ ℕ)
95	94	adantl 481	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → 𝑚 ∈ ℕ)
96		nncn 12236	. . . . . . . . . . . . . . 15 ⊢ (𝑚 ∈ ℕ → 𝑚 ∈ ℂ)
97		nnne0 12262	. . . . . . . . . . . . . . 15 ⊢ (𝑚 ∈ ℕ → 𝑚 ≠ 0)
98	96, 97	jca 511	. . . . . . . . . . . . . 14 ⊢ (𝑚 ∈ ℕ → (𝑚 ∈ ℂ ∧ 𝑚 ≠ 0))
99	95, 98	syl 17	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → (𝑚 ∈ ℂ ∧ 𝑚 ≠ 0))
100		divdiv1 11941	. . . . . . . . . . . . 13 ⊢ ((𝑁 ∈ ℂ ∧ (𝑘 ∈ ℂ ∧ 𝑘 ≠ 0) ∧ (𝑚 ∈ ℂ ∧ 𝑚 ≠ 0)) → ((𝑁 / 𝑘) / 𝑚) = (𝑁 / (𝑘 · 𝑚)))
101	86, 93, 99, 100	syl3anc 1369	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → ((𝑁 / 𝑘) / 𝑚) = (𝑁 / (𝑘 · 𝑚)))
102	101	oveq2d 7430	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → (𝑁 / ((𝑁 / 𝑘) / 𝑚)) = (𝑁 / (𝑁 / (𝑘 · 𝑚))))
103		nnmulcl 12252	. . . . . . . . . . . . . 14 ⊢ ((𝑘 ∈ ℕ ∧ 𝑚 ∈ ℕ) → (𝑘 · 𝑚) ∈ ℕ)
104	88, 94, 103	syl2an 595	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → (𝑘 · 𝑚) ∈ ℕ)
105		nncn 12236	. . . . . . . . . . . . . 14 ⊢ ((𝑘 · 𝑚) ∈ ℕ → (𝑘 · 𝑚) ∈ ℂ)
106		nnne0 12262	. . . . . . . . . . . . . 14 ⊢ ((𝑘 · 𝑚) ∈ ℕ → (𝑘 · 𝑚) ≠ 0)
107	105, 106	jca 511	. . . . . . . . . . . . 13 ⊢ ((𝑘 · 𝑚) ∈ ℕ → ((𝑘 · 𝑚) ∈ ℂ ∧ (𝑘 · 𝑚) ≠ 0))
108	104, 107	syl 17	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → ((𝑘 · 𝑚) ∈ ℂ ∧ (𝑘 · 𝑚) ≠ 0))
109		ddcan 11944	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℂ ∧ 𝑁 ≠ 0) ∧ ((𝑘 · 𝑚) ∈ ℂ ∧ (𝑘 · 𝑚) ≠ 0)) → (𝑁 / (𝑁 / (𝑘 · 𝑚))) = (𝑘 · 𝑚))
110	85, 108, 109	syl2anc 583	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → (𝑁 / (𝑁 / (𝑘 · 𝑚))) = (𝑘 · 𝑚))
111	102, 110	eqtrd 2767	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → (𝑁 / ((𝑁 / 𝑘) / 𝑚)) = (𝑘 · 𝑚))
112	111	eqeq2d 2738	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → (𝑗 = (𝑁 / ((𝑁 / 𝑘) / 𝑚)) ↔ 𝑗 = (𝑘 · 𝑚)))
113	112	biimpa 476	. . . . . . . 8 ⊢ ((((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) ∧ 𝑗 = (𝑁 / ((𝑁 / 𝑘) / 𝑚))) → 𝑗 = (𝑘 · 𝑚))
114		fsumdvdscom.2	. . . . . . . 8 ⊢ (𝑗 = (𝑘 · 𝑚) → 𝐴 = 𝐵)
115	113, 114	syl 17	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) ∧ 𝑗 = (𝑁 / ((𝑁 / 𝑘) / 𝑚))) → 𝐴 = 𝐵)
116	80, 115	csbied 3927	. . . . . 6 ⊢ (((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) ∧ 𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}) → ⦋(𝑁 / ((𝑁 / 𝑘) / 𝑚)) / 𝑗⦌𝐴 = 𝐵)
117	116	sumeq2dv 15667	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → Σ𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}⦋(𝑁 / ((𝑁 / 𝑘) / 𝑚)) / 𝑗⦌𝐴 = Σ𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}𝐵)
118	79, 117	eqtrd 2767	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → Σ𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}⦋(𝑁 / 𝑣) / 𝑗⦌𝐴 = Σ𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}𝐵)
119	118	sumeq2dv 15667	. . 3 ⊢ (𝜑 → Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}Σ𝑣 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}⦋(𝑁 / 𝑣) / 𝑗⦌𝐴 = Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}Σ𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}𝐵)
120	48, 57, 119	3eqtrd 2771	. 2 ⊢ (𝜑 → Σ𝑢 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑢}⦋𝑢 / 𝑗⦌𝐴 = Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}Σ𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}𝐵)
121	10, 120	eqtrid 2779	1 ⊢ (𝜑 → Σ𝑗 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑗}𝐴 = Σ𝑘 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}Σ𝑚 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ (𝑁 / 𝑘)}𝐵)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1534 ∈ wcel 2099 ≠ wne 2935 ∀wral 3056 {crab 3427 Vcvv 3469 ⦋csb 3889 ⊆ wss 3944 class class class wbr 5142 ↦ cmpt 5225 –1-1-onto→wf1o 6541 ‘cfv 6542 (class class class)co 7414 ℂcc 11122 0cc0 11124 1c1 11125 · cmul 11129 / cdiv 11887 ℕcn 12228 ...cfz 13502 Σcsu 15650 ∥ cdvds 16216

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 2164 ax-ext 2698 ax-rep 5279 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7732 ax-inf2 9650 ax-cnex 11180 ax-resscn 11181 ax-1cn 11182 ax-icn 11183 ax-addcl 11184 ax-addrcl 11185 ax-mulcl 11186 ax-mulrcl 11187 ax-mulcom 11188 ax-addass 11189 ax-mulass 11190 ax-distr 11191 ax-i2m1 11192 ax-1ne0 11193 ax-1rid 11194 ax-rnegex 11195 ax-rrecex 11196 ax-cnre 11197 ax-pre-lttri 11198 ax-pre-lttrn 11199 ax-pre-ltadd 11200 ax-pre-mulgt0 11201 ax-pre-sup 11202

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 2529 df-eu 2558 df-clab 2705 df-cleq 2719 df-clel 2805 df-nfc 2880 df-ne 2936 df-nel 3042 df-ral 3057 df-rex 3066 df-rmo 3371 df-reu 3372 df-rab 3428 df-v 3471 df-sbc 3775 df-csb 3890 df-dif 3947 df-un 3949 df-in 3951 df-ss 3961 df-pss 3963 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-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 7863 df-1st 7985 df-2nd 7986 df-frecs 8278 df-wrecs 8309 df-recs 8383 df-rdg 8422 df-1o 8478 df-er 8716 df-en 8954 df-dom 8955 df-sdom 8956 df-fin 8957 df-sup 9451 df-oi 9519 df-card 9948 df-pnf 11266 df-mnf 11267 df-xr 11268 df-ltxr 11269 df-le 11270 df-sub 11462 df-neg 11463 df-div 11888 df-nn 12229 df-2 12291 df-3 12292 df-n0 12489 df-z 12575 df-uz 12839 df-rp 12993 df-fz 13503 df-fzo 13646 df-seq 13985 df-exp 14045 df-hash 14308 df-cj 15064 df-re 15065 df-im 15066 df-sqrt 15200 df-abs 15201 df-clim 15450 df-sum 15651 df-dvds 16217

This theorem is referenced by: logsqvma 27449

W3C validator