Theorem prodfdiv 14467

Description: The quotient of two infinite products. (Contributed by Scott Fenton, 15-Jan-2018.)

Hypotheses

Ref	Expression
prodfdiv.1	⊢ (𝜑 → 𝑁 ∈ (ℤ≥‘𝑀))
prodfdiv.2	⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → (𝐹‘𝑘) ∈ ℂ)
prodfdiv.3	⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → (𝐺‘𝑘) ∈ ℂ)
prodfdiv.4	⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → (𝐺‘𝑘) ≠ 0)
prodfdiv.5	⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → (𝐻‘𝑘) = ((𝐹‘𝑘) / (𝐺‘𝑘)))

Assertion

Ref	Expression
prodfdiv	⊢ (𝜑 → (seq𝑀( · , 𝐻)‘𝑁) = ((seq𝑀( · , 𝐹)‘𝑁) / (seq𝑀( · , 𝐺)‘𝑁)))

Distinct variable groups:   𝑘,𝐹   𝑘,𝐺   𝑘,𝐻   𝜑,𝑘   𝑘,𝑀   𝑘,𝑁

Proof of Theorem prodfdiv

Dummy variables 𝑥 𝑛 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		prodfdiv.1	. . . 4 ⊢ (𝜑 → 𝑁 ∈ (ℤ≥‘𝑀))
2		prodfdiv.3	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → (𝐺‘𝑘) ∈ ℂ)
3		prodfdiv.4	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → (𝐺‘𝑘) ≠ 0)
4		fveq2 6103	. . . . . . 7 ⊢ (𝑛 = 𝑘 → (𝐺‘𝑛) = (𝐺‘𝑘))
5	4	oveq2d 6565	. . . . . 6 ⊢ (𝑛 = 𝑘 → (1 / (𝐺‘𝑛)) = (1 / (𝐺‘𝑘)))
6		eqid 2610	. . . . . 6 ⊢ (𝑛 ∈ (𝑀...𝑁) ↦ (1 / (𝐺‘𝑛))) = (𝑛 ∈ (𝑀...𝑁) ↦ (1 / (𝐺‘𝑛)))
7		ovex 6577	. . . . . 6 ⊢ (1 / (𝐺‘𝑘)) ∈ V
8	5, 6, 7	fvmpt 6191	. . . . 5 ⊢ (𝑘 ∈ (𝑀...𝑁) → ((𝑛 ∈ (𝑀...𝑁) ↦ (1 / (𝐺‘𝑛)))‘𝑘) = (1 / (𝐺‘𝑘)))
9	8	adantl 481	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → ((𝑛 ∈ (𝑀...𝑁) ↦ (1 / (𝐺‘𝑛)))‘𝑘) = (1 / (𝐺‘𝑘)))
10	1, 2, 3, 9	prodfrec 14466	. . 3 ⊢ (𝜑 → (seq𝑀( · , (𝑛 ∈ (𝑀...𝑁) ↦ (1 / (𝐺‘𝑛))))‘𝑁) = (1 / (seq𝑀( · , 𝐺)‘𝑁)))
11	10	oveq2d 6565	. 2 ⊢ (𝜑 → ((seq𝑀( · , 𝐹)‘𝑁) · (seq𝑀( · , (𝑛 ∈ (𝑀...𝑁) ↦ (1 / (𝐺‘𝑛))))‘𝑁)) = ((seq𝑀( · , 𝐹)‘𝑁) · (1 / (seq𝑀( · , 𝐺)‘𝑁))))
12		prodfdiv.2	. . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → (𝐹‘𝑘) ∈ ℂ)
13		eleq1 2676	. . . . . . . . 9 ⊢ (𝑘 = 𝑛 → (𝑘 ∈ (𝑀...𝑁) ↔ 𝑛 ∈ (𝑀...𝑁)))
14	13	anbi2d 736	. . . . . . . 8 ⊢ (𝑘 = 𝑛 → ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) ↔ (𝜑 ∧ 𝑛 ∈ (𝑀...𝑁))))
15		fveq2 6103	. . . . . . . . 9 ⊢ (𝑘 = 𝑛 → (𝐺‘𝑘) = (𝐺‘𝑛))
16	15	eleq1d 2672	. . . . . . . 8 ⊢ (𝑘 = 𝑛 → ((𝐺‘𝑘) ∈ ℂ ↔ (𝐺‘𝑛) ∈ ℂ))
17	14, 16	imbi12d 333	. . . . . . 7 ⊢ (𝑘 = 𝑛 → (((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → (𝐺‘𝑘) ∈ ℂ) ↔ ((𝜑 ∧ 𝑛 ∈ (𝑀...𝑁)) → (𝐺‘𝑛) ∈ ℂ)))
18	17, 2	chvarv 2251	. . . . . 6 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...𝑁)) → (𝐺‘𝑛) ∈ ℂ)
19	15	neeq1d 2841	. . . . . . . 8 ⊢ (𝑘 = 𝑛 → ((𝐺‘𝑘) ≠ 0 ↔ (𝐺‘𝑛) ≠ 0))
20	14, 19	imbi12d 333	. . . . . . 7 ⊢ (𝑘 = 𝑛 → (((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → (𝐺‘𝑘) ≠ 0) ↔ ((𝜑 ∧ 𝑛 ∈ (𝑀...𝑁)) → (𝐺‘𝑛) ≠ 0)))
21	20, 3	chvarv 2251	. . . . . 6 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...𝑁)) → (𝐺‘𝑛) ≠ 0)
22	18, 21	reccld 10673	. . . . 5 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...𝑁)) → (1 / (𝐺‘𝑛)) ∈ ℂ)
23	22, 6	fmptd 6292	. . . 4 ⊢ (𝜑 → (𝑛 ∈ (𝑀...𝑁) ↦ (1 / (𝐺‘𝑛))):(𝑀...𝑁)⟶ℂ)
24	23	ffvelrnda 6267	. . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → ((𝑛 ∈ (𝑀...𝑁) ↦ (1 / (𝐺‘𝑛)))‘𝑘) ∈ ℂ)
25	12, 2, 3	divrecd 10683	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → ((𝐹‘𝑘) / (𝐺‘𝑘)) = ((𝐹‘𝑘) · (1 / (𝐺‘𝑘))))
26		prodfdiv.5	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → (𝐻‘𝑘) = ((𝐹‘𝑘) / (𝐺‘𝑘)))
27	9	oveq2d 6565	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → ((𝐹‘𝑘) · ((𝑛 ∈ (𝑀...𝑁) ↦ (1 / (𝐺‘𝑛)))‘𝑘)) = ((𝐹‘𝑘) · (1 / (𝐺‘𝑘))))
28	25, 26, 27	3eqtr4d 2654	. . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → (𝐻‘𝑘) = ((𝐹‘𝑘) · ((𝑛 ∈ (𝑀...𝑁) ↦ (1 / (𝐺‘𝑛)))‘𝑘)))
29	1, 12, 24, 28	prodfmul 14461	. 2 ⊢ (𝜑 → (seq𝑀( · , 𝐻)‘𝑁) = ((seq𝑀( · , 𝐹)‘𝑁) · (seq𝑀( · , (𝑛 ∈ (𝑀...𝑁) ↦ (1 / (𝐺‘𝑛))))‘𝑁)))
30		mulcl 9899	. . . . 5 ⊢ ((𝑘 ∈ ℂ ∧ 𝑥 ∈ ℂ) → (𝑘 · 𝑥) ∈ ℂ)
31	30	adantl 481	. . . 4 ⊢ ((𝜑 ∧ (𝑘 ∈ ℂ ∧ 𝑥 ∈ ℂ)) → (𝑘 · 𝑥) ∈ ℂ)
32	1, 12, 31	seqcl 12683	. . 3 ⊢ (𝜑 → (seq𝑀( · , 𝐹)‘𝑁) ∈ ℂ)
33	1, 2, 31	seqcl 12683	. . 3 ⊢ (𝜑 → (seq𝑀( · , 𝐺)‘𝑁) ∈ ℂ)
34	1, 2, 3	prodfn0 14465	. . 3 ⊢ (𝜑 → (seq𝑀( · , 𝐺)‘𝑁) ≠ 0)
35	32, 33, 34	divrecd 10683	. 2 ⊢ (𝜑 → ((seq𝑀( · , 𝐹)‘𝑁) / (seq𝑀( · , 𝐺)‘𝑁)) = ((seq𝑀( · , 𝐹)‘𝑁) · (1 / (seq𝑀( · , 𝐺)‘𝑁))))
36	11, 29, 35	3eqtr4d 2654	1 ⊢ (𝜑 → (seq𝑀( · , 𝐻)‘𝑁) = ((seq𝑀( · , 𝐹)‘𝑁) / (seq𝑀( · , 𝐺)‘𝑁)))

Syntax hints:   → wi 4   ∧ wa 383   = wceq 1475   ∈ wcel 1977   ≠ wne 2780   ↦ cmpt 4643  ‘cfv 5804  (class class class)co 6549  ℂcc 9813  0cc0 9815  1c1 9816   · cmul 9820   / cdiv 10563  ℤ_≥cuz 11563  ...cfz 12197  seqcseq 12663

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-er 7629  df-en 7842  df-dom 7843  df-sdom 7844  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-div 10564  df-nn 10898  df-n0 11170  df-z 11255  df-uz 11564  df-fz 12198  df-fzo 12335  df-seq 12664

This theorem is referenced by:  fproddiv  14530