basellem6 - Metamath Proof Explorer

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Theorem basellem6 26587

Description: Lemma for basel 26591. 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 12864	. . 3 ⊢ ℕ = (ℤ_≥‘1)
2		1zzd 12592	. . 3 ⊢ (⊤ → 1 ∈ ℤ)
3		ax-1cn 11167	. . . 4 ⊢ 1 ∈ ℂ
4		divcnv 15798	. . . 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 12217	. . . . . 6 ⊢ ℕ ∈ V
8	7	mptex 7224	. . . . 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 7416	. . . . . 6 ⊢ (𝑛 = 𝑘 → (1 / 𝑛) = (1 / 𝑘))
12		eqid 2732	. . . . . 6 ⊢ (𝑛 ∈ ℕ ↦ (1 / 𝑛)) = (𝑛 ∈ ℕ ↦ (1 / 𝑛))
13		ovex 7441	. . . . . 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 12253	. . . . 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 7416	. . . . . . . 8 ⊢ (𝑛 = 𝑘 → (2 · 𝑛) = (2 · 𝑘))
20	19	oveq1d 7423	. . . . . . 7 ⊢ (𝑛 = 𝑘 → ((2 · 𝑛) + 1) = ((2 · 𝑘) + 1))
21	20	oveq2d 7424	. . . . . 6 ⊢ (𝑛 = 𝑘 → (1 / ((2 · 𝑛) + 1)) = (1 / ((2 · 𝑘) + 1)))
22		ovex 7441	. . . . . 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 12284	. . . . . . . 8 ⊢ 2 ∈ ℕ
26	25	a1i 11	. . . . . . 7 ⊢ (⊤ → 2 ∈ ℕ)
27		nnmulcl 12235	. . . . . . 7 ⊢ ((2 ∈ ℕ ∧ 𝑘 ∈ ℕ) → (2 · 𝑘) ∈ ℕ)
28	26, 27	sylan 580	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (2 · 𝑘) ∈ ℕ)
29	28	peano2nnd 12228	. . . . 5 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → ((2 · 𝑘) + 1) ∈ ℕ)
30	29	nnrecred 12262	. . . 4 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (1 / ((2 · 𝑘) + 1)) ∈ ℝ)
31	24, 30	eqeltrd 2833	. . 3 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (𝐺‘𝑘) ∈ ℝ)
32		nnre 12218	. . . . . . 7 ⊢ (𝑘 ∈ ℕ → 𝑘 ∈ ℝ)
33	32	adantl 482	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 𝑘 ∈ ℝ)
34	28	nnred 12226	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (2 · 𝑘) ∈ ℝ)
35	29	nnred 12226	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → ((2 · 𝑘) + 1) ∈ ℝ)
36		nnnn0 12478	. . . . . . . . 9 ⊢ (𝑘 ∈ ℕ → 𝑘 ∈ ℕ₀)
37	36	adantl 482	. . . . . . . 8 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 𝑘 ∈ ℕ₀)
38		nn0addge1 12517	. . . . . . . 8 ⊢ ((𝑘 ∈ ℝ ∧ 𝑘 ∈ ℕ₀) → 𝑘 ≤ (𝑘 + 𝑘))
39	33, 37, 38	syl2anc 584	. . . . . . 7 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 𝑘 ≤ (𝑘 + 𝑘))
40	33	recnd 11241	. . . . . . . 8 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 𝑘 ∈ ℂ)
41	40	2timesd 12454	. . . . . . 7 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (2 · 𝑘) = (𝑘 + 𝑘))
42	39, 41	breqtrrd 5176	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 𝑘 ≤ (2 · 𝑘))
43	34	lep1d 12144	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (2 · 𝑘) ≤ ((2 · 𝑘) + 1))
44	33, 34, 35, 42, 43	letrd 11370	. . . . 5 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 𝑘 ≤ ((2 · 𝑘) + 1))
45		nngt0 12242	. . . . . . 7 ⊢ (𝑘 ∈ ℕ → 0 < 𝑘)
46	45	adantl 482	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 0 < 𝑘)
47	29	nngt0d 12260	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → 0 < ((2 · 𝑘) + 1))
48		lerec 12096	. . . . . 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 13013	. . . . . 6 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → ((2 · 𝑘) + 1) ∈ ℝ⁺)
53	52	rpreccld 13025	. . . . 5 ⊢ ((⊤ ∧ 𝑘 ∈ ℕ) → (1 / ((2 · 𝑘) + 1)) ∈ ℝ⁺)
54	53	rpge0d 13019	. . . 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 15585	. 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 7408 ℂcc 11107 ℝcr 11108 0cc0 11109 1c1 11110 + caddc 11112 · cmul 11114 < clt 11247 ≤ cle 11248 / cdiv 11870 ℕcn 12211 2c2 12266 ℕ₀cn0 12471 ⇝ cli 15427

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 7724 ax-cnex 11165 ax-resscn 11166 ax-1cn 11167 ax-icn 11168 ax-addcl 11169 ax-addrcl 11170 ax-mulcl 11171 ax-mulrcl 11172 ax-mulcom 11173 ax-addass 11174 ax-mulass 11175 ax-distr 11176 ax-i2m1 11177 ax-1ne0 11178 ax-1rid 11179 ax-rnegex 11180 ax-rrecex 11181 ax-cnre 11182 ax-pre-lttri 11183 ax-pre-lttrn 11184 ax-pre-ltadd 11185 ax-pre-mulgt0 11186 ax-pre-sup 11187

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 7364 df-ov 7411 df-oprab 7412 df-mpo 7413 df-om 7855 df-2nd 7975 df-frecs 8265 df-wrecs 8296 df-recs 8370 df-rdg 8409 df-er 8702 df-pm 8822 df-en 8939 df-dom 8940 df-sdom 8941 df-sup 9436 df-inf 9437 df-pnf 11249 df-mnf 11250 df-xr 11251 df-ltxr 11252 df-le 11253 df-sub 11445 df-neg 11446 df-div 11871 df-nn 12212 df-2 12274 df-3 12275 df-n0 12472 df-z 12558 df-uz 12822 df-rp 12974 df-fl 13756 df-seq 13966 df-exp 14027 df-cj 15045 df-re 15046 df-im 15047 df-sqrt 15181 df-abs 15182 df-clim 15431 df-rlim 15432

This theorem is referenced by: basellem7 26588 basellem9 26590

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