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Theorem chto1lb 26981

Description: The θ function is lower bounded by a linear term. Corollary of chebbnd1 26975. (Contributed by Mario Carneiro, 8-Apr-2016.)

**Assertion**
Ref	Expression
chto1lb	⊢ (𝑥 ∈ (2[,)+∞) ↦ (𝑥 / (θ‘𝑥))) ∈ 𝑂(1)

**Proof of Theorem chto1lb**
Step	Hyp	Ref	Expression
1		ovexd 7444	. . . . 5 ⊢ (⊤ → (2[,)+∞) ∈ V)
2		2re 12286	. . . . . . . . . . . 12 ⊢ 2 ∈ ℝ
3		elicopnf 13422	. . . . . . . . . . . 12 ⊢ (2 ∈ ℝ → (𝑥 ∈ (2[,)+∞) ↔ (𝑥 ∈ ℝ ∧ 2 ≤ 𝑥)))
4	2, 3	ax-mp 5	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (2[,)+∞) ↔ (𝑥 ∈ ℝ ∧ 2 ≤ 𝑥))
5	4	biimpi 215	. . . . . . . . . 10 ⊢ (𝑥 ∈ (2[,)+∞) → (𝑥 ∈ ℝ ∧ 2 ≤ 𝑥))
6	5	simpld 496	. . . . . . . . 9 ⊢ (𝑥 ∈ (2[,)+∞) → 𝑥 ∈ ℝ)
7		0red 11217	. . . . . . . . . 10 ⊢ (𝑥 ∈ (2[,)+∞) → 0 ∈ ℝ)
8	2	a1i 11	. . . . . . . . . 10 ⊢ (𝑥 ∈ (2[,)+∞) → 2 ∈ ℝ)
9		2pos 12315	. . . . . . . . . . 11 ⊢ 0 < 2
10	9	a1i 11	. . . . . . . . . 10 ⊢ (𝑥 ∈ (2[,)+∞) → 0 < 2)
11	5	simprd 497	. . . . . . . . . 10 ⊢ (𝑥 ∈ (2[,)+∞) → 2 ≤ 𝑥)
12	7, 8, 6, 10, 11	ltletrd 11374	. . . . . . . . 9 ⊢ (𝑥 ∈ (2[,)+∞) → 0 < 𝑥)
13	6, 12	elrpd 13013	. . . . . . . 8 ⊢ (𝑥 ∈ (2[,)+∞) → 𝑥 ∈ ℝ⁺)
14		ppinncl 26678	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ ∧ 2 ≤ 𝑥) → (π‘𝑥) ∈ ℕ)
15	14	nnrpd 13014	. . . . . . . . . 10 ⊢ ((𝑥 ∈ ℝ ∧ 2 ≤ 𝑥) → (π‘𝑥) ∈ ℝ⁺)
16	5, 15	syl 17	. . . . . . . . 9 ⊢ (𝑥 ∈ (2[,)+∞) → (π‘𝑥) ∈ ℝ⁺)
17		1red 11215	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (2[,)+∞) → 1 ∈ ℝ)
18		1lt2 12383	. . . . . . . . . . . 12 ⊢ 1 < 2
19	18	a1i 11	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (2[,)+∞) → 1 < 2)
20	17, 8, 6, 19, 11	ltletrd 11374	. . . . . . . . . 10 ⊢ (𝑥 ∈ (2[,)+∞) → 1 < 𝑥)
21	6, 20	rplogcld 26137	. . . . . . . . 9 ⊢ (𝑥 ∈ (2[,)+∞) → (log‘𝑥) ∈ ℝ⁺)
22	16, 21	rpmulcld 13032	. . . . . . . 8 ⊢ (𝑥 ∈ (2[,)+∞) → ((π‘𝑥) · (log‘𝑥)) ∈ ℝ⁺)
23	13, 22	rpdivcld 13033	. . . . . . 7 ⊢ (𝑥 ∈ (2[,)+∞) → (𝑥 / ((π‘𝑥) · (log‘𝑥))) ∈ ℝ⁺)
24	23	rpcnd 13018	. . . . . 6 ⊢ (𝑥 ∈ (2[,)+∞) → (𝑥 / ((π‘𝑥) · (log‘𝑥))) ∈ ℂ)
25	24	adantl 483	. . . . 5 ⊢ ((⊤ ∧ 𝑥 ∈ (2[,)+∞)) → (𝑥 / ((π‘𝑥) · (log‘𝑥))) ∈ ℂ)
26		chtrpcl 26679	. . . . . . . . 9 ⊢ ((𝑥 ∈ ℝ ∧ 2 ≤ 𝑥) → (θ‘𝑥) ∈ ℝ⁺)
27	5, 26	syl 17	. . . . . . . 8 ⊢ (𝑥 ∈ (2[,)+∞) → (θ‘𝑥) ∈ ℝ⁺)
28	22, 27	rpdivcld 13033	. . . . . . 7 ⊢ (𝑥 ∈ (2[,)+∞) → (((π‘𝑥) · (log‘𝑥)) / (θ‘𝑥)) ∈ ℝ⁺)
29	28	rpcnd 13018	. . . . . 6 ⊢ (𝑥 ∈ (2[,)+∞) → (((π‘𝑥) · (log‘𝑥)) / (θ‘𝑥)) ∈ ℂ)
30	29	adantl 483	. . . . 5 ⊢ ((⊤ ∧ 𝑥 ∈ (2[,)+∞)) → (((π‘𝑥) · (log‘𝑥)) / (θ‘𝑥)) ∈ ℂ)
31	6	recnd 11242	. . . . . . . . 9 ⊢ (𝑥 ∈ (2[,)+∞) → 𝑥 ∈ ℂ)
32	21	rpcnd 13018	. . . . . . . . 9 ⊢ (𝑥 ∈ (2[,)+∞) → (log‘𝑥) ∈ ℂ)
33	16	rpcnd 13018	. . . . . . . . 9 ⊢ (𝑥 ∈ (2[,)+∞) → (π‘𝑥) ∈ ℂ)
34	21	rpne0d 13021	. . . . . . . . 9 ⊢ (𝑥 ∈ (2[,)+∞) → (log‘𝑥) ≠ 0)
35	16	rpne0d 13021	. . . . . . . . 9 ⊢ (𝑥 ∈ (2[,)+∞) → (π‘𝑥) ≠ 0)
36	31, 32, 33, 34, 35	divdiv1d 12021	. . . . . . . 8 ⊢ (𝑥 ∈ (2[,)+∞) → ((𝑥 / (log‘𝑥)) / (π‘𝑥)) = (𝑥 / ((log‘𝑥) · (π‘𝑥))))
37	32, 33	mulcomd 11235	. . . . . . . . 9 ⊢ (𝑥 ∈ (2[,)+∞) → ((log‘𝑥) · (π‘𝑥)) = ((π‘𝑥) · (log‘𝑥)))
38	37	oveq2d 7425	. . . . . . . 8 ⊢ (𝑥 ∈ (2[,)+∞) → (𝑥 / ((log‘𝑥) · (π‘𝑥))) = (𝑥 / ((π‘𝑥) · (log‘𝑥))))
39	36, 38	eqtrd 2773	. . . . . . 7 ⊢ (𝑥 ∈ (2[,)+∞) → ((𝑥 / (log‘𝑥)) / (π‘𝑥)) = (𝑥 / ((π‘𝑥) · (log‘𝑥))))
40	39	mpteq2ia 5252	. . . . . 6 ⊢ (𝑥 ∈ (2[,)+∞) ↦ ((𝑥 / (log‘𝑥)) / (π‘𝑥))) = (𝑥 ∈ (2[,)+∞) ↦ (𝑥 / ((π‘𝑥) · (log‘𝑥))))
41	40	a1i 11	. . . . 5 ⊢ (⊤ → (𝑥 ∈ (2[,)+∞) ↦ ((𝑥 / (log‘𝑥)) / (π‘𝑥))) = (𝑥 ∈ (2[,)+∞) ↦ (𝑥 / ((π‘𝑥) · (log‘𝑥)))))
42	27	rpcnd 13018	. . . . . . . 8 ⊢ (𝑥 ∈ (2[,)+∞) → (θ‘𝑥) ∈ ℂ)
43	22	rpcnd 13018	. . . . . . . 8 ⊢ (𝑥 ∈ (2[,)+∞) → ((π‘𝑥) · (log‘𝑥)) ∈ ℂ)
44	27	rpne0d 13021	. . . . . . . 8 ⊢ (𝑥 ∈ (2[,)+∞) → (θ‘𝑥) ≠ 0)
45	22	rpne0d 13021	. . . . . . . 8 ⊢ (𝑥 ∈ (2[,)+∞) → ((π‘𝑥) · (log‘𝑥)) ≠ 0)
46	42, 43, 44, 45	recdivd 12007	. . . . . . 7 ⊢ (𝑥 ∈ (2[,)+∞) → (1 / ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥)))) = (((π‘𝑥) · (log‘𝑥)) / (θ‘𝑥)))
47	46	mpteq2ia 5252	. . . . . 6 ⊢ (𝑥 ∈ (2[,)+∞) ↦ (1 / ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥))))) = (𝑥 ∈ (2[,)+∞) ↦ (((π‘𝑥) · (log‘𝑥)) / (θ‘𝑥)))
48	47	a1i 11	. . . . 5 ⊢ (⊤ → (𝑥 ∈ (2[,)+∞) ↦ (1 / ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥))))) = (𝑥 ∈ (2[,)+∞) ↦ (((π‘𝑥) · (log‘𝑥)) / (θ‘𝑥))))
49	1, 25, 30, 41, 48	offval2 7690	. . . 4 ⊢ (⊤ → ((𝑥 ∈ (2[,)+∞) ↦ ((𝑥 / (log‘𝑥)) / (π‘𝑥))) ∘_f · (𝑥 ∈ (2[,)+∞) ↦ (1 / ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥)))))) = (𝑥 ∈ (2[,)+∞) ↦ ((𝑥 / ((π‘𝑥) · (log‘𝑥))) · (((π‘𝑥) · (log‘𝑥)) / (θ‘𝑥)))))
50	31, 43, 42, 45, 44	dmdcan2d 12020	. . . . 5 ⊢ (𝑥 ∈ (2[,)+∞) → ((𝑥 / ((π‘𝑥) · (log‘𝑥))) · (((π‘𝑥) · (log‘𝑥)) / (θ‘𝑥))) = (𝑥 / (θ‘𝑥)))
51	50	mpteq2ia 5252	. . . 4 ⊢ (𝑥 ∈ (2[,)+∞) ↦ ((𝑥 / ((π‘𝑥) · (log‘𝑥))) · (((π‘𝑥) · (log‘𝑥)) / (θ‘𝑥)))) = (𝑥 ∈ (2[,)+∞) ↦ (𝑥 / (θ‘𝑥)))
52	49, 51	eqtrdi 2789	. . 3 ⊢ (⊤ → ((𝑥 ∈ (2[,)+∞) ↦ ((𝑥 / (log‘𝑥)) / (π‘𝑥))) ∘_f · (𝑥 ∈ (2[,)+∞) ↦ (1 / ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥)))))) = (𝑥 ∈ (2[,)+∞) ↦ (𝑥 / (θ‘𝑥))))
53		chebbnd1 26975	. . . 4 ⊢ (𝑥 ∈ (2[,)+∞) ↦ ((𝑥 / (log‘𝑥)) / (π‘𝑥))) ∈ 𝑂(1)
54		ax-1cn 11168	. . . . . . 7 ⊢ 1 ∈ ℂ
55	54	a1i 11	. . . . . 6 ⊢ ((⊤ ∧ 𝑥 ∈ (2[,)+∞)) → 1 ∈ ℂ)
56	27, 22	rpdivcld 13033	. . . . . . . 8 ⊢ (𝑥 ∈ (2[,)+∞) → ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥))) ∈ ℝ⁺)
57	56	adantl 483	. . . . . . 7 ⊢ ((⊤ ∧ 𝑥 ∈ (2[,)+∞)) → ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥))) ∈ ℝ⁺)
58	57	rpcnd 13018	. . . . . 6 ⊢ ((⊤ ∧ 𝑥 ∈ (2[,)+∞)) → ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥))) ∈ ℂ)
59	6	ssriv 3987	. . . . . . . 8 ⊢ (2[,)+∞) ⊆ ℝ
60		rlimconst 15488	. . . . . . . 8 ⊢ (((2[,)+∞) ⊆ ℝ ∧ 1 ∈ ℂ) → (𝑥 ∈ (2[,)+∞) ↦ 1) ⇝_𝑟 1)
61	59, 54, 60	mp2an 691	. . . . . . 7 ⊢ (𝑥 ∈ (2[,)+∞) ↦ 1) ⇝_𝑟 1
62	61	a1i 11	. . . . . 6 ⊢ (⊤ → (𝑥 ∈ (2[,)+∞) ↦ 1) ⇝_𝑟 1)
63		chtppilim 26978	. . . . . . 7 ⊢ (𝑥 ∈ (2[,)+∞) ↦ ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥)))) ⇝_𝑟 1
64	63	a1i 11	. . . . . 6 ⊢ (⊤ → (𝑥 ∈ (2[,)+∞) ↦ ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥)))) ⇝_𝑟 1)
65		ax-1ne0 11179	. . . . . . 7 ⊢ 1 ≠ 0
66	65	a1i 11	. . . . . 6 ⊢ (⊤ → 1 ≠ 0)
67	56	rpne0d 13021	. . . . . . 7 ⊢ (𝑥 ∈ (2[,)+∞) → ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥))) ≠ 0)
68	67	adantl 483	. . . . . 6 ⊢ ((⊤ ∧ 𝑥 ∈ (2[,)+∞)) → ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥))) ≠ 0)
69	55, 58, 62, 64, 66, 68	rlimdiv 15592	. . . . 5 ⊢ (⊤ → (𝑥 ∈ (2[,)+∞) ↦ (1 / ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥))))) ⇝_𝑟 (1 / 1))
70		rlimo1 15561	. . . . 5 ⊢ ((𝑥 ∈ (2[,)+∞) ↦ (1 / ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥))))) ⇝_𝑟 (1 / 1) → (𝑥 ∈ (2[,)+∞) ↦ (1 / ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥))))) ∈ 𝑂(1))
71	69, 70	syl 17	. . . 4 ⊢ (⊤ → (𝑥 ∈ (2[,)+∞) ↦ (1 / ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥))))) ∈ 𝑂(1))
72		o1mul 15559	. . . 4 ⊢ (((𝑥 ∈ (2[,)+∞) ↦ ((𝑥 / (log‘𝑥)) / (π‘𝑥))) ∈ 𝑂(1) ∧ (𝑥 ∈ (2[,)+∞) ↦ (1 / ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥))))) ∈ 𝑂(1)) → ((𝑥 ∈ (2[,)+∞) ↦ ((𝑥 / (log‘𝑥)) / (π‘𝑥))) ∘_f · (𝑥 ∈ (2[,)+∞) ↦ (1 / ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥)))))) ∈ 𝑂(1))
73	53, 71, 72	sylancr 588	. . 3 ⊢ (⊤ → ((𝑥 ∈ (2[,)+∞) ↦ ((𝑥 / (log‘𝑥)) / (π‘𝑥))) ∘_f · (𝑥 ∈ (2[,)+∞) ↦ (1 / ((θ‘𝑥) / ((π‘𝑥) · (log‘𝑥)))))) ∈ 𝑂(1))
74	52, 73	eqeltrrd 2835	. 2 ⊢ (⊤ → (𝑥 ∈ (2[,)+∞) ↦ (𝑥 / (θ‘𝑥))) ∈ 𝑂(1))
75	74	mptru 1549	1 ⊢ (𝑥 ∈ (2[,)+∞) ↦ (𝑥 / (θ‘𝑥))) ∈ 𝑂(1)

Colors of variables: wff setvar class

Syntax hints: ↔ wb 205 ∧ wa 397 = wceq 1542 ⊤wtru 1543 ∈ wcel 2107 ≠ wne 2941 Vcvv 3475 ⊆ wss 3949 class class class wbr 5149 ↦ cmpt 5232 ‘cfv 6544 (class class class)co 7409 ∘_f cof 7668 ℂcc 11108 ℝcr 11109 0cc0 11110 1c1 11111 · cmul 11115 +∞cpnf 11245 < clt 11248 ≤ cle 11249 / cdiv 11871 2c2 12267 ℝ⁺crp 12974 [,)cico 13326 ⇝_𝑟 crli 15429 𝑂(1)co1 15430 logclog 26063 θccht 26595 πcppi 26598

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-inf2 9636 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 ax-addf 11189 ax-mulf 11190

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-tp 4634 df-op 4636 df-uni 4910 df-int 4952 df-iun 5000 df-iin 5001 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-se 5633 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-isom 6553 df-riota 7365 df-ov 7412 df-oprab 7413 df-mpo 7414 df-of 7670 df-om 7856 df-1st 7975 df-2nd 7976 df-supp 8147 df-frecs 8266 df-wrecs 8297 df-recs 8371 df-rdg 8410 df-1o 8466 df-2o 8467 df-oadd 8470 df-er 8703 df-map 8822 df-pm 8823 df-ixp 8892 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-fsupp 9362 df-fi 9406 df-sup 9437 df-inf 9438 df-oi 9505 df-dju 9896 df-card 9934 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-4 12277 df-5 12278 df-6 12279 df-7 12280 df-8 12281 df-9 12282 df-n0 12473 df-xnn0 12545 df-z 12559 df-dec 12678 df-uz 12823 df-q 12933 df-rp 12975 df-xneg 13092 df-xadd 13093 df-xmul 13094 df-ioo 13328 df-ioc 13329 df-ico 13330 df-icc 13331 df-fz 13485 df-fzo 13628 df-fl 13757 df-mod 13835 df-seq 13967 df-exp 14028 df-fac 14234 df-bc 14263 df-hash 14291 df-shft 15014 df-cj 15046 df-re 15047 df-im 15048 df-sqrt 15182 df-abs 15183 df-limsup 15415 df-clim 15432 df-rlim 15433 df-o1 15434 df-lo1 15435 df-sum 15633 df-ef 16011 df-e 16012 df-sin 16013 df-cos 16014 df-pi 16016 df-dvds 16198 df-gcd 16436 df-prm 16609 df-pc 16770 df-struct 17080 df-sets 17097 df-slot 17115 df-ndx 17127 df-base 17145 df-ress 17174 df-plusg 17210 df-mulr 17211 df-starv 17212 df-sca 17213 df-vsca 17214 df-ip 17215 df-tset 17216 df-ple 17217 df-ds 17219 df-unif 17220 df-hom 17221 df-cco 17222 df-rest 17368 df-topn 17369 df-0g 17387 df-gsum 17388 df-topgen 17389 df-pt 17390 df-prds 17393 df-xrs 17448 df-qtop 17453 df-imas 17454 df-xps 17456 df-mre 17530 df-mrc 17531 df-acs 17533 df-mgm 18561 df-sgrp 18610 df-mnd 18626 df-submnd 18672 df-mulg 18951 df-cntz 19181 df-cmn 19650 df-psmet 20936 df-xmet 20937 df-met 20938 df-bl 20939 df-mopn 20940 df-fbas 20941 df-fg 20942 df-cnfld 20945 df-top 22396 df-topon 22413 df-topsp 22435 df-bases 22449 df-cld 22523 df-ntr 22524 df-cls 22525 df-nei 22602 df-lp 22640 df-perf 22641 df-cn 22731 df-cnp 22732 df-haus 22819 df-tx 23066 df-hmeo 23259 df-fil 23350 df-fm 23442 df-flim 23443 df-flf 23444 df-xms 23826 df-ms 23827 df-tms 23828 df-cncf 24394 df-limc 25383 df-dv 25384 df-log 26065 df-cxp 26066 df-cht 26601 df-ppi 26604

This theorem is referenced by: chpchtlim 26982

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