geo2lim - Metamath Proof Explorer

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Theorem geo2lim 15845

Description: The value of the infinite geometric series 2↑-1 + 2↑-2 +... , multiplied by a constant. (Contributed by Mario Carneiro, 15-Jun-2014.)

**Hypothesis**
Ref	Expression
geo2lim.1	⊢ 𝐹 = (𝑘 ∈ ℕ ↦ (𝐴 / (2↑𝑘)))

**Assertion**
Ref	Expression
geo2lim	⊢ (𝐴 ∈ ℂ → seq1( + , 𝐹) ⇝ 𝐴)

Distinct variable group: 𝐴,𝑘 Allowed substitution hint: 𝐹(𝑘)

Proof of Theorem geo2lim Dummy variables 𝑗 𝑛 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		nnuz 12887	. . 3 ⊢ ℕ = (ℤ_≥‘1)
2		1zzd 12615	. . 3 ⊢ (𝐴 ∈ ℂ → 1 ∈ ℤ)
3		halfcn 12449	. . . . . . 7 ⊢ (1 / 2) ∈ ℂ
4	3	a1i 11	. . . . . 6 ⊢ (𝐴 ∈ ℂ → (1 / 2) ∈ ℂ)
5		halfre 12448	. . . . . . . . 9 ⊢ (1 / 2) ∈ ℝ
6		halfge0 12451	. . . . . . . . 9 ⊢ 0 ≤ (1 / 2)
7		absid 15267	. . . . . . . . 9 ⊢ (((1 / 2) ∈ ℝ ∧ 0 ≤ (1 / 2)) → (abs‘(1 / 2)) = (1 / 2))
8	5, 6, 7	mp2an 691	. . . . . . . 8 ⊢ (abs‘(1 / 2)) = (1 / 2)
9		halflt1 12452	. . . . . . . 8 ⊢ (1 / 2) < 1
10	8, 9	eqbrtri 5163	. . . . . . 7 ⊢ (abs‘(1 / 2)) < 1
11	10	a1i 11	. . . . . 6 ⊢ (𝐴 ∈ ℂ → (abs‘(1 / 2)) < 1)
12	4, 11	expcnv 15834	. . . . 5 ⊢ (𝐴 ∈ ℂ → (𝑘 ∈ ℕ₀ ↦ ((1 / 2)↑𝑘)) ⇝ 0)
13		id 22	. . . . 5 ⊢ (𝐴 ∈ ℂ → 𝐴 ∈ ℂ)
14		geo2lim.1	. . . . . . 7 ⊢ 𝐹 = (𝑘 ∈ ℕ ↦ (𝐴 / (2↑𝑘)))
15		nnex 12240	. . . . . . . 8 ⊢ ℕ ∈ V
16	15	mptex 7229	. . . . . . 7 ⊢ (𝑘 ∈ ℕ ↦ (𝐴 / (2↑𝑘))) ∈ V
17	14, 16	eqeltri 2824	. . . . . 6 ⊢ 𝐹 ∈ V
18	17	a1i 11	. . . . 5 ⊢ (𝐴 ∈ ℂ → 𝐹 ∈ V)
19		nnnn0 12501	. . . . . . . . 9 ⊢ (𝑗 ∈ ℕ → 𝑗 ∈ ℕ₀)
20	19	adantl 481	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ ℕ₀)
21		oveq2 7422	. . . . . . . . 9 ⊢ (𝑘 = 𝑗 → ((1 / 2)↑𝑘) = ((1 / 2)↑𝑗))
22		eqid 2727	. . . . . . . . 9 ⊢ (𝑘 ∈ ℕ₀ ↦ ((1 / 2)↑𝑘)) = (𝑘 ∈ ℕ₀ ↦ ((1 / 2)↑𝑘))
23		ovex 7447	. . . . . . . . 9 ⊢ ((1 / 2)↑𝑗) ∈ V
24	21, 22, 23	fvmpt 6999	. . . . . . . 8 ⊢ (𝑗 ∈ ℕ₀ → ((𝑘 ∈ ℕ₀ ↦ ((1 / 2)↑𝑘))‘𝑗) = ((1 / 2)↑𝑗))
25	20, 24	syl 17	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → ((𝑘 ∈ ℕ₀ ↦ ((1 / 2)↑𝑘))‘𝑗) = ((1 / 2)↑𝑗))
26		2cn 12309	. . . . . . . 8 ⊢ 2 ∈ ℂ
27		2ne0 12338	. . . . . . . 8 ⊢ 2 ≠ 0
28		nnz 12601	. . . . . . . . 9 ⊢ (𝑗 ∈ ℕ → 𝑗 ∈ ℤ)
29	28	adantl 481	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ ℤ)
30		exprec 14092	. . . . . . . 8 ⊢ ((2 ∈ ℂ ∧ 2 ≠ 0 ∧ 𝑗 ∈ ℤ) → ((1 / 2)↑𝑗) = (1 / (2↑𝑗)))
31	26, 27, 29, 30	mp3an12i 1462	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → ((1 / 2)↑𝑗) = (1 / (2↑𝑗)))
32	25, 31	eqtrd 2767	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → ((𝑘 ∈ ℕ₀ ↦ ((1 / 2)↑𝑘))‘𝑗) = (1 / (2↑𝑗)))
33		2nn 12307	. . . . . . . . 9 ⊢ 2 ∈ ℕ
34		nnexpcl 14063	. . . . . . . . 9 ⊢ ((2 ∈ ℕ ∧ 𝑗 ∈ ℕ₀) → (2↑𝑗) ∈ ℕ)
35	33, 20, 34	sylancr 586	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (2↑𝑗) ∈ ℕ)
36	35	nnrecred 12285	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (1 / (2↑𝑗)) ∈ ℝ)
37	36	recnd 11264	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (1 / (2↑𝑗)) ∈ ℂ)
38	32, 37	eqeltrd 2828	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → ((𝑘 ∈ ℕ₀ ↦ ((1 / 2)↑𝑘))‘𝑗) ∈ ℂ)
39		simpl 482	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → 𝐴 ∈ ℂ)
40	35	nncnd 12250	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (2↑𝑗) ∈ ℂ)
41	35	nnne0d 12284	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (2↑𝑗) ≠ 0)
42	39, 40, 41	divrecd 12015	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐴 / (2↑𝑗)) = (𝐴 · (1 / (2↑𝑗))))
43		oveq2 7422	. . . . . . . . 9 ⊢ (𝑘 = 𝑗 → (2↑𝑘) = (2↑𝑗))
44	43	oveq2d 7430	. . . . . . . 8 ⊢ (𝑘 = 𝑗 → (𝐴 / (2↑𝑘)) = (𝐴 / (2↑𝑗)))
45		ovex 7447	. . . . . . . 8 ⊢ (𝐴 / (2↑𝑗)) ∈ V
46	44, 14, 45	fvmpt 6999	. . . . . . 7 ⊢ (𝑗 ∈ ℕ → (𝐹‘𝑗) = (𝐴 / (2↑𝑗)))
47	46	adantl 481	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐹‘𝑗) = (𝐴 / (2↑𝑗)))
48	32	oveq2d 7430	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐴 · ((𝑘 ∈ ℕ₀ ↦ ((1 / 2)↑𝑘))‘𝑗)) = (𝐴 · (1 / (2↑𝑗))))
49	42, 47, 48	3eqtr4d 2777	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐹‘𝑗) = (𝐴 · ((𝑘 ∈ ℕ₀ ↦ ((1 / 2)↑𝑘))‘𝑗)))
50	1, 2, 12, 13, 18, 38, 49	climmulc2 15605	. . . 4 ⊢ (𝐴 ∈ ℂ → 𝐹 ⇝ (𝐴 · 0))
51		mul01 11415	. . . 4 ⊢ (𝐴 ∈ ℂ → (𝐴 · 0) = 0)
52	50, 51	breqtrd 5168	. . 3 ⊢ (𝐴 ∈ ℂ → 𝐹 ⇝ 0)
53		seqex 13992	. . . 4 ⊢ seq1( + , 𝐹) ∈ V
54	53	a1i 11	. . 3 ⊢ (𝐴 ∈ ℂ → seq1( + , 𝐹) ∈ V)
55	39, 40, 41	divcld 12012	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐴 / (2↑𝑗)) ∈ ℂ)
56	47, 55	eqeltrd 2828	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐹‘𝑗) ∈ ℂ)
57	47	oveq2d 7430	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐴 − (𝐹‘𝑗)) = (𝐴 − (𝐴 / (2↑𝑗))))
58		geo2sum 15843	. . . . 5 ⊢ ((𝑗 ∈ ℕ ∧ 𝐴 ∈ ℂ) → Σ𝑛 ∈ (1...𝑗)(𝐴 / (2↑𝑛)) = (𝐴 − (𝐴 / (2↑𝑗))))
59	58	ancoms 458	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → Σ𝑛 ∈ (1...𝑗)(𝐴 / (2↑𝑛)) = (𝐴 − (𝐴 / (2↑𝑗))))
60		elfznn 13554	. . . . . . 7 ⊢ (𝑛 ∈ (1...𝑗) → 𝑛 ∈ ℕ)
61	60	adantl 481	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (1...𝑗)) → 𝑛 ∈ ℕ)
62		oveq2 7422	. . . . . . . 8 ⊢ (𝑘 = 𝑛 → (2↑𝑘) = (2↑𝑛))
63	62	oveq2d 7430	. . . . . . 7 ⊢ (𝑘 = 𝑛 → (𝐴 / (2↑𝑘)) = (𝐴 / (2↑𝑛)))
64		ovex 7447	. . . . . . 7 ⊢ (𝐴 / (2↑𝑛)) ∈ V
65	63, 14, 64	fvmpt 6999	. . . . . 6 ⊢ (𝑛 ∈ ℕ → (𝐹‘𝑛) = (𝐴 / (2↑𝑛)))
66	61, 65	syl 17	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (1...𝑗)) → (𝐹‘𝑛) = (𝐴 / (2↑𝑛)))
67		simpr 484	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ ℕ)
68	67, 1	eleqtrdi 2838	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ (ℤ_≥‘1))
69		simpll 766	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (1...𝑗)) → 𝐴 ∈ ℂ)
70		nnnn0 12501	. . . . . . . . 9 ⊢ (𝑛 ∈ ℕ → 𝑛 ∈ ℕ₀)
71		nnexpcl 14063	. . . . . . . . 9 ⊢ ((2 ∈ ℕ ∧ 𝑛 ∈ ℕ₀) → (2↑𝑛) ∈ ℕ)
72	33, 70, 71	sylancr 586	. . . . . . . 8 ⊢ (𝑛 ∈ ℕ → (2↑𝑛) ∈ ℕ)
73	61, 72	syl 17	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (1...𝑗)) → (2↑𝑛) ∈ ℕ)
74	73	nncnd 12250	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (1...𝑗)) → (2↑𝑛) ∈ ℂ)
75	73	nnne0d 12284	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (1...𝑗)) → (2↑𝑛) ≠ 0)
76	69, 74, 75	divcld 12012	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (1...𝑗)) → (𝐴 / (2↑𝑛)) ∈ ℂ)
77	66, 68, 76	fsumser 15700	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → Σ𝑛 ∈ (1...𝑗)(𝐴 / (2↑𝑛)) = (seq1( + , 𝐹)‘𝑗))
78	57, 59, 77	3eqtr2rd 2774	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (seq1( + , 𝐹)‘𝑗) = (𝐴 − (𝐹‘𝑗)))
79	1, 2, 52, 13, 54, 56, 78	climsubc2 15607	. 2 ⊢ (𝐴 ∈ ℂ → seq1( + , 𝐹) ⇝ (𝐴 − 0))
80		subid1 11502	. 2 ⊢ (𝐴 ∈ ℂ → (𝐴 − 0) = 𝐴)
81	79, 80	breqtrd 5168	1 ⊢ (𝐴 ∈ ℂ → seq1( + , 𝐹) ⇝ 𝐴)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1534 ∈ wcel 2099 ≠ wne 2935 Vcvv 3469 class class class wbr 5142 ↦ cmpt 5225 ‘cfv 6542 (class class class)co 7414 ℂcc 11128 ℝcr 11129 0cc0 11130 1c1 11131 + caddc 11133 · cmul 11135 < clt 11270 ≤ cle 11271 − cmin 11466 / cdiv 11893 ℕcn 12234 2c2 12289 ℕ₀cn0 12494 ℤcz 12580 ℤ_≥cuz 12844 ...cfz 13508 seqcseq 13990 ↑cexp 14050 abscabs 15205 ⇝ cli 15452 Σcsu 15656

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 7734 ax-inf2 9656 ax-cnex 11186 ax-resscn 11187 ax-1cn 11188 ax-icn 11189 ax-addcl 11190 ax-addrcl 11191 ax-mulcl 11192 ax-mulrcl 11193 ax-mulcom 11194 ax-addass 11195 ax-mulass 11196 ax-distr 11197 ax-i2m1 11198 ax-1ne0 11199 ax-1rid 11200 ax-rnegex 11201 ax-rrecex 11202 ax-cnre 11203 ax-pre-lttri 11204 ax-pre-lttrn 11205 ax-pre-ltadd 11206 ax-pre-mulgt0 11207 ax-pre-sup 11208

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 7865 df-1st 7987 df-2nd 7988 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-1o 8480 df-er 8718 df-pm 8839 df-en 8956 df-dom 8957 df-sdom 8958 df-fin 8959 df-sup 9457 df-inf 9458 df-oi 9525 df-card 9954 df-pnf 11272 df-mnf 11273 df-xr 11274 df-ltxr 11275 df-le 11276 df-sub 11468 df-neg 11469 df-div 11894 df-nn 12235 df-2 12297 df-3 12298 df-n0 12495 df-z 12581 df-uz 12845 df-rp 12999 df-fz 13509 df-fzo 13652 df-fl 13781 df-seq 13991 df-exp 14051 df-hash 14314 df-cj 15070 df-re 15071 df-im 15072 df-sqrt 15206 df-abs 15207 df-clim 15456 df-rlim 15457 df-sum 15657

This theorem is referenced by: omssubadd 33856 sge0ad2en 45742

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