Theorem geo2lim 11457

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 9501	. . 3 ⊢ ℕ = (ℤ≥‘1)
2		1zzd 9218	. . 3 ⊢ (𝐴 ∈ ℂ → 1 ∈ ℤ)
3		halfcn 9071	. . . . . . 7 ⊢ (1 / 2) ∈ ℂ
4	3	a1i 9	. . . . . 6 ⊢ (𝐴 ∈ ℂ → (1 / 2) ∈ ℂ)
5		halfre 9070	. . . . . . . . 9 ⊢ (1 / 2) ∈ ℝ
6		halfge0 9073	. . . . . . . . 9 ⊢ 0 ≤ (1 / 2)
7		absid 11013	. . . . . . . . 9 ⊢ (((1 / 2) ∈ ℝ ∧ 0 ≤ (1 / 2)) → (abs‘(1 / 2)) = (1 / 2))
8	5, 6, 7	mp2an 423	. . . . . . . 8 ⊢ (abs‘(1 / 2)) = (1 / 2)
9		halflt1 9074	. . . . . . . 8 ⊢ (1 / 2) < 1
10	8, 9	eqbrtri 4003	. . . . . . 7 ⊢ (abs‘(1 / 2)) < 1
11	10	a1i 9	. . . . . 6 ⊢ (𝐴 ∈ ℂ → (abs‘(1 / 2)) < 1)
12	4, 11	expcnv 11445	. . . . 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 8863	. . . . . . . 8 ⊢ ℕ ∈ V
16	15	mptex 5711	. . . . . . 7 ⊢ (𝑘 ∈ ℕ ↦ (𝐴 / (2↑𝑘))) ∈ V
17	14, 16	eqeltri 2239	. . . . . 6 ⊢ 𝐹 ∈ V
18	17	a1i 9	. . . . 5 ⊢ (𝐴 ∈ ℂ → 𝐹 ∈ V)
19		nnnn0 9121	. . . . . . . 8 ⊢ (𝑗 ∈ ℕ → 𝑗 ∈ ℕ0)
20	19	adantl 275	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ ℕ0)
21	3	a1i 9	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (1 / 2) ∈ ℂ)
22	21, 20	expcld 10588	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → ((1 / 2)↑𝑗) ∈ ℂ)
23		oveq2 5850	. . . . . . . 8 ⊢ (𝑘 = 𝑗 → ((1 / 2)↑𝑘) = ((1 / 2)↑𝑗))
24		eqid 2165	. . . . . . . 8 ⊢ (𝑘 ∈ ℕ0 ↦ ((1 / 2)↑𝑘)) = (𝑘 ∈ ℕ0 ↦ ((1 / 2)↑𝑘))
25	23, 24	fvmptg 5562	. . . . . . 7 ⊢ ((𝑗 ∈ ℕ0 ∧ ((1 / 2)↑𝑗) ∈ ℂ) → ((𝑘 ∈ ℕ0 ↦ ((1 / 2)↑𝑘))‘𝑗) = ((1 / 2)↑𝑗))
26	20, 22, 25	syl2anc 409	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → ((𝑘 ∈ ℕ0 ↦ ((1 / 2)↑𝑘))‘𝑗) = ((1 / 2)↑𝑗))
27	26, 22	eqeltrd 2243	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → ((𝑘 ∈ ℕ0 ↦ ((1 / 2)↑𝑘))‘𝑗) ∈ ℂ)
28		simpl 108	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → 𝐴 ∈ ℂ)
29		2nn 9018	. . . . . . . . 9 ⊢ 2 ∈ ℕ
30		nnexpcl 10468	. . . . . . . . 9 ⊢ ((2 ∈ ℕ ∧ 𝑗 ∈ ℕ0) → (2↑𝑗) ∈ ℕ)
31	29, 20, 30	sylancr 411	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (2↑𝑗) ∈ ℕ)
32	31	nncnd 8871	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (2↑𝑗) ∈ ℂ)
33	31	nnap0d 8903	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (2↑𝑗) # 0)
34	28, 32, 33	divrecapd 8689	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐴 / (2↑𝑗)) = (𝐴 · (1 / (2↑𝑗))))
35		simpr 109	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ ℕ)
36	28, 32, 33	divclapd 8686	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐴 / (2↑𝑗)) ∈ ℂ)
37		oveq2 5850	. . . . . . . . 9 ⊢ (𝑘 = 𝑗 → (2↑𝑘) = (2↑𝑗))
38	37	oveq2d 5858	. . . . . . . 8 ⊢ (𝑘 = 𝑗 → (𝐴 / (2↑𝑘)) = (𝐴 / (2↑𝑗)))
39	38, 14	fvmptg 5562	. . . . . . 7 ⊢ ((𝑗 ∈ ℕ ∧ (𝐴 / (2↑𝑗)) ∈ ℂ) → (𝐹‘𝑗) = (𝐴 / (2↑𝑗)))
40	35, 36, 39	syl2anc 409	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐹‘𝑗) = (𝐴 / (2↑𝑗)))
41		2cn 8928	. . . . . . . . 9 ⊢ 2 ∈ ℂ
42		2ap0 8950	. . . . . . . . 9 ⊢ 2 # 0
43		nnz 9210	. . . . . . . . . 10 ⊢ (𝑗 ∈ ℕ → 𝑗 ∈ ℤ)
44	43	adantl 275	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ ℤ)
45		exprecap 10496	. . . . . . . . 9 ⊢ ((2 ∈ ℂ ∧ 2 # 0 ∧ 𝑗 ∈ ℤ) → ((1 / 2)↑𝑗) = (1 / (2↑𝑗)))
46	41, 42, 44, 45	mp3an12i 1331	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → ((1 / 2)↑𝑗) = (1 / (2↑𝑗)))
47	26, 46	eqtrd 2198	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → ((𝑘 ∈ ℕ0 ↦ ((1 / 2)↑𝑘))‘𝑗) = (1 / (2↑𝑗)))
48	47	oveq2d 5858	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐴 · ((𝑘 ∈ ℕ0 ↦ ((1 / 2)↑𝑘))‘𝑗)) = (𝐴 · (1 / (2↑𝑗))))
49	34, 40, 48	3eqtr4d 2208	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐹‘𝑗) = (𝐴 · ((𝑘 ∈ ℕ0 ↦ ((1 / 2)↑𝑘))‘𝑗)))
50	1, 2, 12, 13, 18, 27, 49	climmulc2 11272	. . . 4 ⊢ (𝐴 ∈ ℂ → 𝐹 ⇝ (𝐴 · 0))
51		mul01 8287	. . . 4 ⊢ (𝐴 ∈ ℂ → (𝐴 · 0) = 0)
52	50, 51	breqtrd 4008	. . 3 ⊢ (𝐴 ∈ ℂ → 𝐹 ⇝ 0)
53		seqex 10382	. . . 4 ⊢ seq1( + , 𝐹) ∈ V
54	53	a1i 9	. . 3 ⊢ (𝐴 ∈ ℂ → seq1( + , 𝐹) ∈ V)
55	40, 36	eqeltrd 2243	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐹‘𝑗) ∈ ℂ)
56	40	oveq2d 5858	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (𝐴 − (𝐹‘𝑗)) = (𝐴 − (𝐴 / (2↑𝑗))))
57		geo2sum 11455	. . . . 5 ⊢ ((𝑗 ∈ ℕ ∧ 𝐴 ∈ ℂ) → Σ𝑛 ∈ (1...𝑗)(𝐴 / (2↑𝑛)) = (𝐴 − (𝐴 / (2↑𝑗))))
58	57	ancoms 266	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → Σ𝑛 ∈ (1...𝑗)(𝐴 / (2↑𝑛)) = (𝐴 − (𝐴 / (2↑𝑗))))
59		elnnuz 9502	. . . . . . . 8 ⊢ (𝑛 ∈ ℕ ↔ 𝑛 ∈ (ℤ≥‘1))
60	59	biimpri 132	. . . . . . 7 ⊢ (𝑛 ∈ (ℤ≥‘1) → 𝑛 ∈ ℕ)
61	60	adantl 275	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (ℤ≥‘1)) → 𝑛 ∈ ℕ)
62		simpll 519	. . . . . . 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 9167	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (ℤ≥‘1)) → 𝑛 ∈ ℕ0)
65	63, 64	expcld 10588	. . . . . . 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 9312	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (ℤ≥‘1)) → 𝑛 ∈ ℤ)
68	63, 66, 67	expap0d 10594	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (ℤ≥‘1)) → (2↑𝑛) # 0)
69	62, 65, 68	divclapd 8686	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (ℤ≥‘1)) → (𝐴 / (2↑𝑛)) ∈ ℂ)
70		oveq2 5850	. . . . . . . 8 ⊢ (𝑘 = 𝑛 → (2↑𝑘) = (2↑𝑛))
71	70	oveq2d 5858	. . . . . . 7 ⊢ (𝑘 = 𝑛 → (𝐴 / (2↑𝑘)) = (𝐴 / (2↑𝑛)))
72	71, 14	fvmptg 5562	. . . . . 6 ⊢ ((𝑛 ∈ ℕ ∧ (𝐴 / (2↑𝑛)) ∈ ℂ) → (𝐹‘𝑛) = (𝐴 / (2↑𝑛)))
73	61, 69, 72	syl2anc 409	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) ∧ 𝑛 ∈ (ℤ≥‘1)) → (𝐹‘𝑛) = (𝐴 / (2↑𝑛)))
74	35, 1	eleqtrdi 2259	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ (ℤ≥‘1))
75	73, 74, 69	fsum3ser 11338	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → Σ𝑛 ∈ (1...𝑗)(𝐴 / (2↑𝑛)) = (seq1( + , 𝐹)‘𝑗))
76	56, 58, 75	3eqtr2rd 2205	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝑗 ∈ ℕ) → (seq1( + , 𝐹)‘𝑗) = (𝐴 − (𝐹‘𝑗)))
77	1, 2, 52, 13, 54, 55, 76	climsubc2 11274	. 2 ⊢ (𝐴 ∈ ℂ → seq1( + , 𝐹) ⇝ (𝐴 − 0))
78		subid1 8118	. 2 ⊢ (𝐴 ∈ ℂ → (𝐴 − 0) = 𝐴)
79	77, 78	breqtrd 4008	1 ⊢ (𝐴 ∈ ℂ → seq1( + , 𝐹) ⇝ 𝐴)

Syntax hints:   → wi 4   ∧ wa 103   = wceq 1343   ∈ wcel 2136  Vcvv 2726   class class class wbr 3982   ↦ cmpt 4043  ‘cfv 5188  (class class class)co 5842  ℂcc 7751  ℝcr 7752  0cc0 7753  1c1 7754   + caddc 7756   · cmul 7758   < clt 7933   ≤ cle 7934   − cmin 8069   # cap 8479   / cdiv 8568  ℕcn 8857  2c2 8908  ℕ₀cn0 9114  ℤcz 9191  ℤ_≥cuz 9466  ...cfz 9944  seqcseq 10380  ↑cexp 10454  abscabs 10939   ⇝ cli 11219  Σcsu 11294

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-coll 4097  ax-sep 4100  ax-nul 4108  ax-pow 4153  ax-pr 4187  ax-un 4411  ax-setind 4514  ax-iinf 4565  ax-cnex 7844  ax-resscn 7845  ax-1cn 7846  ax-1re 7847  ax-icn 7848  ax-addcl 7849  ax-addrcl 7850  ax-mulcl 7851  ax-mulrcl 7852  ax-addcom 7853  ax-mulcom 7854  ax-addass 7855  ax-mulass 7856  ax-distr 7857  ax-i2m1 7858  ax-0lt1 7859  ax-1rid 7860  ax-0id 7861  ax-rnegex 7862  ax-precex 7863  ax-cnre 7864  ax-pre-ltirr 7865  ax-pre-ltwlin 7866  ax-pre-lttrn 7867  ax-pre-apti 7868  ax-pre-ltadd 7869  ax-pre-mulgt0 7870  ax-pre-mulext 7871  ax-arch 7872  ax-caucvg 7873

This theorem depends on definitions:  df-bi 116  df-dc 825  df-3or 969  df-3an 970  df-tru 1346  df-fal 1349  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ne 2337  df-nel 2432  df-ral 2449  df-rex 2450  df-reu 2451  df-rmo 2452  df-rab 2453  df-v 2728  df-sbc 2952  df-csb 3046  df-dif 3118  df-un 3120  df-in 3122  df-ss 3129  df-nul 3410  df-if 3521  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-int 3825  df-iun 3868  df-br 3983  df-opab 4044  df-mpt 4045  df-tr 4081  df-id 4271  df-po 4274  df-iso 4275  df-iord 4344  df-on 4346  df-ilim 4347  df-suc 4349  df-iom 4568  df-xp 4610  df-rel 4611  df-cnv 4612  df-co 4613  df-dm 4614  df-rn 4615  df-res 4616  df-ima 4617  df-iota 5153  df-fun 5190  df-fn 5191  df-f 5192  df-f1 5193  df-fo 5194  df-f1o 5195  df-fv 5196  df-isom 5197  df-riota 5798  df-ov 5845  df-oprab 5846  df-mpo 5847  df-1st 6108  df-2nd 6109  df-recs 6273  df-irdg 6338  df-frec 6359  df-1o 6384  df-oadd 6388  df-er 6501  df-en 6707  df-dom 6708  df-fin 6709  df-pnf 7935  df-mnf 7936  df-xr 7937  df-ltxr 7938  df-le 7939  df-sub 8071  df-neg 8072  df-reap 8473  df-ap 8480  df-div 8569  df-inn 8858  df-2 8916  df-3 8917  df-4 8918  df-n0 9115  df-z 9192  df-uz 9467  df-q 9558  df-rp 9590  df-fz 9945  df-fzo 10078  df-seqfrec 10381  df-exp 10455  df-ihash 10689  df-cj 10784  df-re 10785  df-im 10786  df-rsqrt 10940  df-abs 10941  df-clim 11220  df-sumdc 11295

This theorem is referenced by:  trilpolemeq1  13919