basellem6 - Metamath Proof Explorer

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Theorem basellem6 26597

Description: Lemma for basel 26601. 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 12867	. . 3 ⊢ ℕ = (ℤ_≥‘1)
2		1zzd 12595	. . 3 ⊢ (⊤ → 1 ∈ ℤ)
3		ax-1cn 11170	. . . 4 ⊢ 1 ∈ ℂ
4		divcnv 15801	. . . 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 12220	. . . . . 6 ⊢ ℕ ∈ V
8	7	mptex 7227	. . . . 5 ⊢ (𝑛 ∈ ℕ ↦ (1 / ((2 · 𝑛) + 1))) ∈ V
9	6, 8	eqeltri 2829	. . . 4 ⊢ 𝐺 ∈ V
10	9	a1i 11	. . 3 ⊢ (⊤ → 𝐺 ∈ V)
11		oveq2 7419	. . . . . 6 ⊢ (𝑛 = 𝑘 → (1 / 𝑛) = (1 / 𝑘))
12		eqid 2732	. . . . . 6 ⊢ (𝑛 ∈ ℕ ↦ (1 / 𝑛)) = (𝑛 ∈ ℕ ↦ (1 / 𝑛))
13		ovex 7444	. . . . . 6 ⊢ (1 / 𝑘) ∈ V
14	11, 12, 13	fvmpt 6998	. . . . 5 ⊢ (𝑘 ∈ ℕ → ((𝑛 ∈ ℕ ↦ (1 / 𝑛))‘𝑘) = (1 / 𝑘))
15	14	adantl 482	. . . 4 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → ((𝑛 ∈ ℕ ↦ (1 / 𝑛))‘𝑘) = (1 / 𝑘))
16		nnrecre 12256	. . . . 5 ⊢ (𝑘 ∈ ℕ → (1 / 𝑘) ∈ ℝ)
17	16	adantl 482	. . . 4 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (1 / 𝑘) ∈ ℝ)
18	15, 17	eqeltrd 2833	. . 3 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → ((𝑛 ∈ ℕ ↦ (1 / 𝑛))‘𝑘) ∈ ℝ)
19		oveq2 7419	. . . . . . . 8 ⊢ (𝑛 = 𝑘 → (2 · 𝑛) = (2 · 𝑘))
20	19	oveq1d 7426	. . . . . . 7 ⊢ (𝑛 = 𝑘 → ((2 · 𝑛) + 1) = ((2 · 𝑘) + 1))
21	20	oveq2d 7427	. . . . . 6 ⊢ (𝑛 = 𝑘 → (1 / ((2 · 𝑛) + 1)) = (1 / ((2 · 𝑘) + 1)))
22		ovex 7444	. . . . . 6 ⊢ (1 / ((2 · 𝑘) + 1)) ∈ V
23	21, 6, 22	fvmpt 6998	. . . . 5 ⊢ (𝑘 ∈ ℕ → (𝐺‘𝑘) = (1 / ((2 · 𝑘) + 1)))
24	23	adantl 482	. . . 4 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (𝐺‘𝑘) = (1 / ((2 · 𝑘) + 1)))
25		2nn 12287	. . . . . . . 8 ⊢ 2 ∈ ℕ
26	25	a1i 11	. . . . . . 7 ⊢ (⊤ → 2 ∈ ℕ)
27		nnmulcl 12238	. . . . . . 7 ⊢ ((2 ∈ ℕ ∧ 𝑘 ∈ ℕ) → (2 · 𝑘) ∈ ℕ)
28	26, 27	sylan 580	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (2 · 𝑘) ∈ ℕ)
29	28	peano2nnd 12231	. . . . 5 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → ((2 · 𝑘) + 1) ∈ ℕ)
30	29	nnrecred 12265	. . . 4 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (1 / ((2 · 𝑘) + 1)) ∈ ℝ)
31	24, 30	eqeltrd 2833	. . 3 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (𝐺‘𝑘) ∈ ℝ)
32		nnre 12221	. . . . . . 7 ⊢ (𝑘 ∈ ℕ → 𝑘 ∈ ℝ)
33	32	adantl 482	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 𝑘 ∈ ℝ)
34	28	nnred 12229	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (2 · 𝑘) ∈ ℝ)
35	29	nnred 12229	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → ((2 · 𝑘) + 1) ∈ ℝ)
36		nnnn0 12481	. . . . . . . . 9 ⊢ (𝑘 ∈ ℕ → 𝑘 ∈ ℕ₀)
37	36	adantl 482	. . . . . . . 8 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 𝑘 ∈ ℕ₀)
38		nn0addge1 12520	. . . . . . . 8 ⊢ ((𝑘 ∈ ℝ ∧ 𝑘 ∈ ℕ₀) → 𝑘 ≤ (𝑘 + 𝑘))
39	33, 37, 38	syl2anc 584	. . . . . . 7 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 𝑘 ≤ (𝑘 + 𝑘))
40	33	recnd 11244	. . . . . . . 8 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 𝑘 ∈ ℂ)
41	40	2timesd 12457	. . . . . . 7 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (2 · 𝑘) = (𝑘 + 𝑘))
42	39, 41	breqtrrd 5176	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 𝑘 ≤ (2 · 𝑘))
43	34	lep1d 12147	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (2 · 𝑘) ≤ ((2 · 𝑘) + 1))
44	33, 34, 35, 42, 43	letrd 11373	. . . . 5 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 𝑘 ≤ ((2 · 𝑘) + 1))
45		nngt0 12245	. . . . . . 7 ⊢ (𝑘 ∈ ℕ → 0 < 𝑘)
46	45	adantl 482	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 0 < 𝑘)
47	29	nngt0d 12263	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 0 < ((2 · 𝑘) + 1))
48		lerec 12099	. . . . . 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 837	. . . . 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 5180	. . 3 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (𝐺‘𝑘) ≤ ((𝑛 ∈ ℕ ↦ (1 / 𝑛))‘𝑘))
52	29	nnrpd 13016	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → ((2 · 𝑘) + 1) ∈ ℝ⁺)
53	52	rpreccld 13028	. . . . 5 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (1 / ((2 · 𝑘) + 1)) ∈ ℝ⁺)
54	53	rpge0d 13022	. . . 4 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 0 ≤ (1 / ((2 · 𝑘) + 1)))
55	54, 24	breqtrrd 5176	. . 3 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 0 ≤ (𝐺‘𝑘))
56	1, 2, 5, 10, 18, 31, 51, 55	climsqz2 15588	. 2 ⊢ (⊤ → 𝐺 ⇝ 0)
57	56	mptru 1548	1 ⊢ 𝐺 ⇝ 0

Colors of variables: wff setvar class

Syntax hints: ↔ wb 205 ∧ wa 396 = wceq 1541 ⊤wtru 1542 ∈ wcel 2106 Vcvv 3474 class class class wbr 5148 ↦ cmpt 5231 ‘cfv 6543 (class class class)co 7411 ℂcc 11110 ℝcr 11111 0cc0 11112 1c1 11113 + caddc 11115 · cmul 11117 < clt 11250 ≤ cle 11251 / cdiv 11873 ℕcn 12214 2c2 12269 ℕ₀cn0 12474 ⇝ cli 15430

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7727 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189 ax-pre-sup 11190

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7367 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7858 df-2nd 7978 df-frecs 8268 df-wrecs 8299 df-recs 8373 df-rdg 8412 df-er 8705 df-pm 8825 df-en 8942 df-dom 8943 df-sdom 8944 df-sup 9439 df-inf 9440 df-pnf 11252 df-mnf 11253 df-xr 11254 df-ltxr 11255 df-le 11256 df-sub 11448 df-neg 11449 df-div 11874 df-nn 12215 df-2 12277 df-3 12278 df-n0 12475 df-z 12561 df-uz 12825 df-rp 12977 df-fl 13759 df-seq 13969 df-exp 14030 df-cj 15048 df-re 15049 df-im 15050 df-sqrt 15184 df-abs 15185 df-clim 15434 df-rlim 15435

This theorem is referenced by: basellem7 26598 basellem9 26600

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