basellem6 - Metamath Proof Explorer

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Theorem basellem6 26590

Description: Lemma for basel 26594. The function 𝐺 goes to zero because it is bounded by 1 / 𝑛. (Contributed by Mario Carneiro, 28-Jul-2014.)

**Hypothesis**
Ref	Expression
basel.g	⊢ 𝐺 = (𝑛 ∈ ℕ ↦ (1 / ((2 · 𝑛) + 1)))

**Assertion**
Ref	Expression
basellem6	⊢ 𝐺 ⇝ 0

Proof of Theorem basellem6 Dummy variable 𝑘 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		nnuz 12865	. . 3 ⊢ ℕ = (ℤ_≥‘1)
2		1zzd 12593	. . 3 ⊢ (⊤ → 1 ∈ ℤ)
3		ax-1cn 11168	. . . 4 ⊢ 1 ∈ ℂ
4		divcnv 15799	. . . 4 ⊢ (1 ∈ ℂ → (𝑛 ∈ ℕ ↦ (1 / 𝑛)) ⇝ 0)
5	3, 4	mp1i 13	. . 3 ⊢ (⊤ → (𝑛 ∈ ℕ ↦ (1 / 𝑛)) ⇝ 0)
6		basel.g	. . . . 5 ⊢ 𝐺 = (𝑛 ∈ ℕ ↦ (1 / ((2 · 𝑛) + 1)))
7		nnex 12218	. . . . . 6 ⊢ ℕ ∈ V
8	7	mptex 7225	. . . . 5 ⊢ (𝑛 ∈ ℕ ↦ (1 / ((2 · 𝑛) + 1))) ∈ V
9	6, 8	eqeltri 2830	. . . 4 ⊢ 𝐺 ∈ V
10	9	a1i 11	. . 3 ⊢ (⊤ → 𝐺 ∈ V)
11		oveq2 7417	. . . . . 6 ⊢ (𝑛 = 𝑘 → (1 / 𝑛) = (1 / 𝑘))
12		eqid 2733	. . . . . 6 ⊢ (𝑛 ∈ ℕ ↦ (1 / 𝑛)) = (𝑛 ∈ ℕ ↦ (1 / 𝑛))
13		ovex 7442	. . . . . 6 ⊢ (1 / 𝑘) ∈ V
14	11, 12, 13	fvmpt 6999	. . . . 5 ⊢ (𝑘 ∈ ℕ → ((𝑛 ∈ ℕ ↦ (1 / 𝑛))‘𝑘) = (1 / 𝑘))
15	14	adantl 483	. . . 4 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → ((𝑛 ∈ ℕ ↦ (1 / 𝑛))‘𝑘) = (1 / 𝑘))
16		nnrecre 12254	. . . . 5 ⊢ (𝑘 ∈ ℕ → (1 / 𝑘) ∈ ℝ)
17	16	adantl 483	. . . 4 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (1 / 𝑘) ∈ ℝ)
18	15, 17	eqeltrd 2834	. . 3 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → ((𝑛 ∈ ℕ ↦ (1 / 𝑛))‘𝑘) ∈ ℝ)
19		oveq2 7417	. . . . . . . 8 ⊢ (𝑛 = 𝑘 → (2 · 𝑛) = (2 · 𝑘))
20	19	oveq1d 7424	. . . . . . 7 ⊢ (𝑛 = 𝑘 → ((2 · 𝑛) + 1) = ((2 · 𝑘) + 1))
21	20	oveq2d 7425	. . . . . 6 ⊢ (𝑛 = 𝑘 → (1 / ((2 · 𝑛) + 1)) = (1 / ((2 · 𝑘) + 1)))
22		ovex 7442	. . . . . 6 ⊢ (1 / ((2 · 𝑘) + 1)) ∈ V
23	21, 6, 22	fvmpt 6999	. . . . 5 ⊢ (𝑘 ∈ ℕ → (𝐺‘𝑘) = (1 / ((2 · 𝑘) + 1)))
24	23	adantl 483	. . . 4 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (𝐺‘𝑘) = (1 / ((2 · 𝑘) + 1)))
25		2nn 12285	. . . . . . . 8 ⊢ 2 ∈ ℕ
26	25	a1i 11	. . . . . . 7 ⊢ (⊤ → 2 ∈ ℕ)
27		nnmulcl 12236	. . . . . . 7 ⊢ ((2 ∈ ℕ ∧ 𝑘 ∈ ℕ) → (2 · 𝑘) ∈ ℕ)
28	26, 27	sylan 581	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (2 · 𝑘) ∈ ℕ)
29	28	peano2nnd 12229	. . . . 5 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → ((2 · 𝑘) + 1) ∈ ℕ)
30	29	nnrecred 12263	. . . 4 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (1 / ((2 · 𝑘) + 1)) ∈ ℝ)
31	24, 30	eqeltrd 2834	. . 3 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (𝐺‘𝑘) ∈ ℝ)
32		nnre 12219	. . . . . . 7 ⊢ (𝑘 ∈ ℕ → 𝑘 ∈ ℝ)
33	32	adantl 483	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 𝑘 ∈ ℝ)
34	28	nnred 12227	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (2 · 𝑘) ∈ ℝ)
35	29	nnred 12227	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → ((2 · 𝑘) + 1) ∈ ℝ)
36		nnnn0 12479	. . . . . . . . 9 ⊢ (𝑘 ∈ ℕ → 𝑘 ∈ ℕ₀)
37	36	adantl 483	. . . . . . . 8 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 𝑘 ∈ ℕ₀)
38		nn0addge1 12518	. . . . . . . 8 ⊢ ((𝑘 ∈ ℝ ∧ 𝑘 ∈ ℕ₀) → 𝑘 ≤ (𝑘 + 𝑘))
39	33, 37, 38	syl2anc 585	. . . . . . 7 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 𝑘 ≤ (𝑘 + 𝑘))
40	33	recnd 11242	. . . . . . . 8 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 𝑘 ∈ ℂ)
41	40	2timesd 12455	. . . . . . 7 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (2 · 𝑘) = (𝑘 + 𝑘))
42	39, 41	breqtrrd 5177	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 𝑘 ≤ (2 · 𝑘))
43	34	lep1d 12145	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (2 · 𝑘) ≤ ((2 · 𝑘) + 1))
44	33, 34, 35, 42, 43	letrd 11371	. . . . 5 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 𝑘 ≤ ((2 · 𝑘) + 1))
45		nngt0 12243	. . . . . . 7 ⊢ (𝑘 ∈ ℕ → 0 < 𝑘)
46	45	adantl 483	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 0 < 𝑘)
47	29	nngt0d 12261	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 0 < ((2 · 𝑘) + 1))
48		lerec 12097	. . . . . 6 ⊢ (((𝑘 ∈ ℝ ∧ 0 < 𝑘) ∧ (((2 · 𝑘) + 1) ∈ ℝ ∧ 0 < ((2 · 𝑘) + 1))) → (𝑘 ≤ ((2 · 𝑘) + 1) ↔ (1 / ((2 · 𝑘) + 1)) ≤ (1 / 𝑘)))
49	33, 46, 35, 47, 48	syl22anc 838	. . . . 5 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (𝑘 ≤ ((2 · 𝑘) + 1) ↔ (1 / ((2 · 𝑘) + 1)) ≤ (1 / 𝑘)))
50	44, 49	mpbid 231	. . . 4 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (1 / ((2 · 𝑘) + 1)) ≤ (1 / 𝑘))
51	50, 24, 15	3brtr4d 5181	. . 3 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (𝐺‘𝑘) ≤ ((𝑛 ∈ ℕ ↦ (1 / 𝑛))‘𝑘))
52	29	nnrpd 13014	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → ((2 · 𝑘) + 1) ∈ ℝ⁺)
53	52	rpreccld 13026	. . . . 5 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (1 / ((2 · 𝑘) + 1)) ∈ ℝ⁺)
54	53	rpge0d 13020	. . . 4 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 0 ≤ (1 / ((2 · 𝑘) + 1)))
55	54, 24	breqtrrd 5177	. . 3 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 0 ≤ (𝐺‘𝑘))
56	1, 2, 5, 10, 18, 31, 51, 55	climsqz2 15586	. 2 ⊢ (⊤ → 𝐺 ⇝ 0)
57	56	mptru 1549	1 ⊢ 𝐺 ⇝ 0

Colors of variables: wff setvar class

Syntax hints: ↔ wb 205 ∧ wa 397 = wceq 1542 ⊤wtru 1543 ∈ wcel 2107 Vcvv 3475 class class class wbr 5149 ↦ cmpt 5232 ‘cfv 6544 (class class class)co 7409 ℂcc 11108 ℝcr 11109 0cc0 11110 1c1 11111 + caddc 11113 · cmul 11115 < clt 11248 ≤ cle 11249 / cdiv 11871 ℕcn 12212 2c2 12267 ℕ₀cn0 12472 ⇝ cli 15428

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 ax-cnex 11166 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186 ax-pre-mulgt0 11187 ax-pre-sup 11188

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-riota 7365 df-ov 7412 df-oprab 7413 df-mpo 7414 df-om 7856 df-2nd 7976 df-frecs 8266 df-wrecs 8297 df-recs 8371 df-rdg 8410 df-er 8703 df-pm 8823 df-en 8940 df-dom 8941 df-sdom 8942 df-sup 9437 df-inf 9438 df-pnf 11250 df-mnf 11251 df-xr 11252 df-ltxr 11253 df-le 11254 df-sub 11446 df-neg 11447 df-div 11872 df-nn 12213 df-2 12275 df-3 12276 df-n0 12473 df-z 12559 df-uz 12823 df-rp 12975 df-fl 13757 df-seq 13967 df-exp 14028 df-cj 15046 df-re 15047 df-im 15048 df-sqrt 15182 df-abs 15183 df-clim 15432 df-rlim 15433

This theorem is referenced by: basellem7 26591 basellem9 26593

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