Theorem geo2lim 12285

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 9960	. . 3 ⊢ ℕ = (ℤ≥‘1)
2		1zzd 9673	. . 3 ⊢ (𝐴 ∈ ℂ → 1 ∈ ℤ)
3		halfcn 9521	. . . . . . 7 ⊢ (1 / 2) ∈ ℂ
4	3	a1i 9	. . . . . 6 ⊢ (𝐴 ∈ ℂ → (1 / 2) ∈ ℂ)
5		halfre 9520	. . . . . . . . 9 ⊢ (1 / 2) ∈ ℝ
6		halfge0 9523	. . . . . . . . 9 ⊢ 0 ≤ (1 / 2)
7		absid 11839	. . . . . . . . 9 ⊢ (((1 / 2) ∈ ℝ ∧ 0 ≤ (1 / 2)) → (abs‘(1 / 2)) = (1 / 2))
8	5, 6, 7	mp2an 430	. . . . . . . 8 ⊢ (abs‘(1 / 2)) = (1 / 2)
9		halflt1 9524	. . . . . . . 8 ⊢ (1 / 2) < 1
10	8, 9	eqbrtri 4151	. . . . . . 7 ⊢ (abs‘(1 / 2)) < 1
11	10	a1i 9	. . . . . 6 ⊢ (𝐴 ∈ ℂ → (abs‘(1 / 2)) < 1)
12	4, 11	expcnv 12273	. . . . 5 ⊢ (𝐴 ∈ ℂ → (𝑘 ∈ ℕ0 ↦ ((1 / 2)↑𝑘)) ⇝ 0)
13		id 19	. . . . 5 ⊢ (𝐴 ∈ ℂ → 𝐴 ∈ ℂ)
14		geo2lim.1	. . . . . . 7 ⊢ 𝐹 = (𝑘 ∈ ℕ ↦ (𝐴 / (2↑𝑘)))
15		nnex 9311	. . . . . . . 8 ⊢ ℕ ∈ V
16	15	mptex 5943	. . . . . . 7 ⊢ (𝑘 ∈ ℕ ↦ (𝐴 / (2↑𝑘))) ∈ V
17	14, 16	eqeltri 2311	. . . . . 6 ⊢ 𝐹 ∈ V
18	17	a1i 9	. . . . 5 ⊢ (𝐴 ∈ ℂ → 𝐹 ∈ V)
19		nnnn0 9572	. . . . . . . 8 ⊢ (𝑗 ∈ ℕ → 𝑗 ∈ ℕ0)
20	19	adantl 277	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ ℕ0)
21	3	a1i 9	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (1 / 2) ∈ ℂ)
22	21, 20	expcld 11113	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → ((1 / 2)↑𝑗) ∈ ℂ)
23		oveq2 6093	. . . . . . . 8 ⊢ (𝑘 = 𝑗 → ((1 / 2)↑𝑘) = ((1 / 2)↑𝑗))
24		eqid 2238	. . . . . . . 8 ⊢ (𝑘 ∈ ℕ0 ↦ ((1 / 2)↑𝑘)) = (𝑘 ∈ ℕ0 ↦ ((1 / 2)↑𝑘))
25	23, 24	fvmptg 5781	. . . . . . 7 ⊢ ((𝑗 ∈ ℕ0 ∧ ((1 / 2)↑𝑗) ∈ ℂ) → ((𝑘 ∈ ℕ0 ↦ ((1 / 2)↑𝑘))‘𝑗) = ((1 / 2)↑𝑗))
26	20, 22, 25	syl2anc 415	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → ((𝑘 ∈ ℕ0 ↦ ((1 / 2)↑𝑘))‘𝑗) = ((1 / 2)↑𝑗))
27	26, 22	eqeltrd 2315	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → ((𝑘 ∈ ℕ0 ↦ ((1 / 2)↑𝑘))‘𝑗) ∈ ℂ)
28		simpl 109	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → 𝐴 ∈ ℂ)
29		2nn 9468	. . . . . . . . 9 ⊢ 2 ∈ ℕ
30		nnexpcl 10991	. . . . . . . . 9 ⊢ ((2 ∈ ℕ ∧ 𝑗 ∈ ℕ0) → (2↑𝑗) ∈ ℕ)
31	29, 20, 30	sylancr 418	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (2↑𝑗) ∈ ℕ)
32	31	nncnd 9319	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (2↑𝑗) ∈ ℂ)
33	31	nnap0d 9351	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (2↑𝑗) # 0)
34	28, 32, 33	divrecapd 9124	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐴 / (2↑𝑗)) = (𝐴 · (1 / (2↑𝑗))))
35		simpr 110	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ ℕ)
36	28, 32, 33	divclapd 9121	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐴 / (2↑𝑗)) ∈ ℂ)
37		oveq2 6093	. . . . . . . . 9 ⊢ (𝑘 = 𝑗 → (2↑𝑘) = (2↑𝑗))
38	37	oveq2d 6101	. . . . . . . 8 ⊢ (𝑘 = 𝑗 → (𝐴 / (2↑𝑘)) = (𝐴 / (2↑𝑗)))
39	38, 14	fvmptg 5781	. . . . . . 7 ⊢ ((𝑗 ∈ ℕ ∧ (𝐴 / (2↑𝑗)) ∈ ℂ) → (𝐹‘𝑗) = (𝐴 / (2↑𝑗)))
40	35, 36, 39	syl2anc 415	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐹‘𝑗) = (𝐴 / (2↑𝑗)))
41		2cn 9376	. . . . . . . . 9 ⊢ 2 ∈ ℂ
42		2ap0 9398	. . . . . . . . 9 ⊢ 2 # 0
43		nnz 9665	. . . . . . . . . 10 ⊢ (𝑗 ∈ ℕ → 𝑗 ∈ ℤ)
44	43	adantl 277	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ ℤ)
45		exprecap 11019	. . . . . . . . 9 ⊢ ((2 ∈ ℂ ∧ 2 # 0 ∧ 𝑗 ∈ ℤ) → ((1 / 2)↑𝑗) = (1 / (2↑𝑗)))
46	41, 42, 44, 45	mp3an12i 1382	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → ((1 / 2)↑𝑗) = (1 / (2↑𝑗)))
47	26, 46	eqtrd 2271	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → ((𝑘 ∈ ℕ0 ↦ ((1 / 2)↑𝑘))‘𝑗) = (1 / (2↑𝑗)))
48	47	oveq2d 6101	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐴 · ((𝑘 ∈ ℕ0 ↦ ((1 / 2)↑𝑘))‘𝑗)) = (𝐴 · (1 / (2↑𝑗))))
49	34, 40, 48	3eqtr4d 2281	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐹‘𝑗) = (𝐴 · ((𝑘 ∈ ℕ0 ↦ ((1 / 2)↑𝑘))‘𝑗)))
50	1, 2, 12, 13, 18, 27, 49	climmulc2 12099	. . . 4 ⊢ (𝐴 ∈ ℂ → 𝐹 ⇝ (𝐴 · 0))
51		mul01 8716	. . . 4 ⊢ (𝐴 ∈ ℂ → (𝐴 · 0) = 0)
52	50, 51	breqtrd 4156	. . 3 ⊢ (𝐴 ∈ ℂ → 𝐹 ⇝ 0)
53		seqex 10888	. . . 4 ⊢ seq1( + , 𝐹) ∈ V
54	53	a1i 9	. . 3 ⊢ (𝐴 ∈ ℂ → seq1( + , 𝐹) ∈ V)
55	40, 36	eqeltrd 2315	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐹‘𝑗) ∈ ℂ)
56	40	oveq2d 6101	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐴 − (𝐹‘𝑗)) = (𝐴 − (𝐴 / (2↑𝑗))))
57		geo2sum 12283	. . . . 5 ⊢ ((𝑗 ∈ ℕ ∧ 𝐴 ∈ ℂ) → Σ𝑛 ∈ (1...𝑗)(𝐴 / (2↑𝑛)) = (𝐴 − (𝐴 / (2↑𝑗))))
58	57	ancoms 268	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → Σ𝑛 ∈ (1...𝑗)(𝐴 / (2↑𝑛)) = (𝐴 − (𝐴 / (2↑𝑗))))
59		elnnuz 9961	. . . . . . . 8 ⊢ (𝑛 ∈ ℕ ↔ 𝑛 ∈ (ℤ≥‘1))
60	59	biimpri 133	. . . . . . 7 ⊢ (𝑛 ∈ (ℤ≥‘1) → 𝑛 ∈ ℕ)
61	60	adantl 277	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (ℤ≥‘1)) → 𝑛 ∈ ℕ)
62		simpll 531	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (ℤ≥‘1)) → 𝐴 ∈ ℂ)
63	41	a1i 9	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (ℤ≥‘1)) → 2 ∈ ℂ)
64	61	nnnn0d 9622	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (ℤ≥‘1)) → 𝑛 ∈ ℕ0)
65	63, 64	expcld 11113	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (ℤ≥‘1)) → (2↑𝑛) ∈ ℂ)
66	42	a1i 9	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (ℤ≥‘1)) → 2 # 0)
67	61	nnzd 9769	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (ℤ≥‘1)) → 𝑛 ∈ ℤ)
68	63, 66, 67	expap0d 11119	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (ℤ≥‘1)) → (2↑𝑛) # 0)
69	62, 65, 68	divclapd 9121	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (ℤ≥‘1)) → (𝐴 / (2↑𝑛)) ∈ ℂ)
70		oveq2 6093	. . . . . . . 8 ⊢ (𝑘 = 𝑛 → (2↑𝑘) = (2↑𝑛))
71	70	oveq2d 6101	. . . . . . 7 ⊢ (𝑘 = 𝑛 → (𝐴 / (2↑𝑘)) = (𝐴 / (2↑𝑛)))
72	71, 14	fvmptg 5781	. . . . . 6 ⊢ ((𝑛 ∈ ℕ ∧ (𝐴 / (2↑𝑛)) ∈ ℂ) → (𝐹‘𝑛) = (𝐴 / (2↑𝑛)))
73	61, 69, 72	syl2anc 415	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (ℤ≥‘1)) → (𝐹‘𝑛) = (𝐴 / (2↑𝑛)))
74	35, 1	eleqtrdi 2331	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ (ℤ≥‘1))
75	73, 74, 69	fsum3ser 12166	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → Σ𝑛 ∈ (1...𝑗)(𝐴 / (2↑𝑛)) = (seq1( + , 𝐹)‘𝑗))
76	56, 58, 75	3eqtr2rd 2278	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (seq1( + , 𝐹)‘𝑗) = (𝐴 − (𝐹‘𝑗)))
77	1, 2, 52, 13, 54, 55, 76	climsubc2 12101	. 2 ⊢ (𝐴 ∈ ℂ → seq1( + , 𝐹) ⇝ (𝐴 − 0))
78		subid1 8546	. 2 ⊢ (𝐴 ∈ ℂ → (𝐴 − 0) = 𝐴)
79	77, 78	breqtrd 4156	1 ⊢ (𝐴 ∈ ℂ → seq1( + , 𝐹) ⇝ 𝐴)

This proof depends on syntax axioms:   → wi 4   ∧ wa 104   = wceq 1402   ∈ wcel 2209  Vcvv 2821   class class class wbr 4130   ↦ cmpt 4192  ‘cfv 5377  (class class class)co 6085  ℂcc 8177  ℝcr 8178  0cc0 8179  1c1 8180   + caddc 8182   · cmul 8184   < clt 8360   ≤ cle 8361   − cmin 8497   # cap 8910   / cdiv 9003  ℕcn 9305  2c2 9356  ℕ₀cn0 9565  ℤcz 9646  ℤ_≥cuz 9923  ...cfz 10413  seqcseq 10886  ↑cexp 10977  abscabs 11765   ⇝ cli 12046  Σcsu 12121

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4246  ax-sep 4249  ax-nul 4259  ax-pow 4311  ax-pr 4346  ax-un 4578  ax-setind 4684  ax-iinf 4735  ax-cnex 8270  ax-resscn 8271  ax-1cn 8272  ax-1re 8273  ax-icn 8274  ax-addcl 8275  ax-addrcl 8276  ax-mulcl 8277  ax-mulrcl 8278  ax-addcom 8279  ax-mulcom 8280  ax-addass 8281  ax-mulass 8282  ax-distr 8283  ax-i2m1 8284  ax-0lt1 8285  ax-1rid 8286  ax-0id 8287  ax-rnegex 8288  ax-precex 8289  ax-cnre 8290  ax-pre-ltirr 8291  ax-pre-ltwlin 8292  ax-pre-lttrn 8293  ax-pre-apti 8294  ax-pre-ltadd 8295  ax-pre-mulgt0 8296  ax-pre-mulext 8297  ax-arch 8298  ax-caucvg 8299

This proof depends on definitions:  df-bi 117  df-dc 847  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-if 3639  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-iun 4014  df-br 4131  df-opab 4193  df-mpt 4194  df-tr 4230  df-id 4438  df-po 4441  df-iso 4442  df-iord 4511  df-on 4513  df-ilim 4514  df-suc 4516  df-iom 4738  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-res 4786  df-ima 4787  df-iota 5337  df-fun 5379  df-fn 5380  df-f 5381  df-f1 5382  df-fo 5383  df-f1o 5384  df-fv 5385  df-isom 5386  df-riota 6038  df-ov 6088  df-oprab 6089  df-mpo 6090  df-1st 6374  df-2nd 6375  df-recs 6576  df-irdg 6641  df-frec 6662  df-1o 6687  df-oadd 6691  df-er 6807  df-en 7023  df-dom 7024  df-fin 7025  df-pnf 8362  df-mnf 8363  df-xr 8364  df-ltxr 8365  df-le 8366  df-sub 8499  df-neg 8500  df-reap 8904  df-ap 8911  df-div 9004  df-inn 9306  df-2 9364  df-3 9365  df-4 9366  df-n0 9566  df-z 9647  df-uz 9924  df-q 10022  df-rp 10057  df-fz 10414  df-fzo 10552  df-seqfrec 10887  df-exp 10978  df-ihash 11217  df-cj 11609  df-re 11610  df-im 11611  df-rsqrt 11766  df-abs 11767  df-clim 12047  df-sumdc 12122

This theorem is used by:  trilpolemeq1  17101