Theorem lo1resb 15485

Description: The restriction of a function to an unbounded-above interval is eventually upper bounded iff the original is eventually upper bounded. (Contributed by Mario Carneiro, 26-May-2016.)

Hypotheses

Ref	Expression
lo1resb.1	⊢ (𝜑 → 𝐹:𝐴⟶ℝ)
lo1resb.2	⊢ (𝜑 → 𝐴 ⊆ ℝ)
lo1resb.3	⊢ (𝜑 → 𝐵 ∈ ℝ)

Assertion

Ref	Expression
lo1resb	⊢ (𝜑 → (𝐹 ∈ ≤𝑂(1) ↔ (𝐹 ↾ (𝐵[,)+∞)) ∈ ≤𝑂(1)))

Proof of Theorem lo1resb

Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		lo1res 15480	. 2 ⊢ (𝐹 ∈ ≤𝑂(1) → (𝐹 ↾ (𝐵[,)+∞)) ∈ ≤𝑂(1))
2		lo1resb.1	. . . . . . 7 ⊢ (𝜑 → 𝐹:𝐴⟶ℝ)
3	2	feqmptd 6900	. . . . . 6 ⊢ (𝜑 → 𝐹 = (𝑥 ∈ 𝐴 ↦ (𝐹‘𝑥)))
4	3	reseq1d 5935	. . . . 5 ⊢ (𝜑 → (𝐹 ↾ (𝐵[,)+∞)) = ((𝑥 ∈ 𝐴 ↦ (𝐹‘𝑥)) ↾ (𝐵[,)+∞)))
5		resmpt3 5995	. . . . 5 ⊢ ((𝑥 ∈ 𝐴 ↦ (𝐹‘𝑥)) ↾ (𝐵[,)+∞)) = (𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞)) ↦ (𝐹‘𝑥))
6	4, 5	eqtrdi 2785	. . . 4 ⊢ (𝜑 → (𝐹 ↾ (𝐵[,)+∞)) = (𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞)) ↦ (𝐹‘𝑥)))
7	6	eleq1d 2819	. . 3 ⊢ (𝜑 → ((𝐹 ↾ (𝐵[,)+∞)) ∈ ≤𝑂(1) ↔ (𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞)) ↦ (𝐹‘𝑥)) ∈ ≤𝑂(1)))
8		inss1 4187	. . . . . 6 ⊢ (𝐴 ∩ (𝐵[,)+∞)) ⊆ 𝐴
9		lo1resb.2	. . . . . 6 ⊢ (𝜑 → 𝐴 ⊆ ℝ)
10	8, 9	sstrid 3943	. . . . 5 ⊢ (𝜑 → (𝐴 ∩ (𝐵[,)+∞)) ⊆ ℝ)
11		elinel1 4151	. . . . . 6 ⊢ (𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞)) → 𝑥 ∈ 𝐴)
12		ffvelcdm 7024	. . . . . 6 ⊢ ((𝐹:𝐴⟶ℝ ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝑥) ∈ ℝ)
13	2, 11, 12	syl2an 596	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞))) → (𝐹‘𝑥) ∈ ℝ)
14	10, 13	ello1mpt 15442	. . . 4 ⊢ (𝜑 → ((𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞)) ↦ (𝐹‘𝑥)) ∈ ≤𝑂(1) ↔ ∃𝑦 ∈ ℝ ∃𝑧 ∈ ℝ ∀𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞))(𝑦 ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧)))
15		elin 3915	. . . . . . . . . 10 ⊢ (𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞)) ↔ (𝑥 ∈ 𝐴 ∧ 𝑥 ∈ (𝐵[,)+∞)))
16	15	imbi1i 349	. . . . . . . . 9 ⊢ ((𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞)) → (𝑦 ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧)) ↔ ((𝑥 ∈ 𝐴 ∧ 𝑥 ∈ (𝐵[,)+∞)) → (𝑦 ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧)))
17		impexp 450	. . . . . . . . 9 ⊢ (((𝑥 ∈ 𝐴 ∧ 𝑥 ∈ (𝐵[,)+∞)) → (𝑦 ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧)) ↔ (𝑥 ∈ 𝐴 → (𝑥 ∈ (𝐵[,)+∞) → (𝑦 ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧))))
18	16, 17	bitri 275	. . . . . . . 8 ⊢ ((𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞)) → (𝑦 ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧)) ↔ (𝑥 ∈ 𝐴 → (𝑥 ∈ (𝐵[,)+∞) → (𝑦 ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧))))
19		impexp 450	. . . . . . . . . 10 ⊢ (((𝑥 ∈ (𝐵[,)+∞) ∧ 𝑦 ≤ 𝑥) → (𝐹‘𝑥) ≤ 𝑧) ↔ (𝑥 ∈ (𝐵[,)+∞) → (𝑦 ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧)))
20		lo1resb.3	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 𝐵 ∈ ℝ)
21	20	ad2antrr 726	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℝ)
22	9	adantr 480	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) → 𝐴 ⊆ ℝ)
23	22	sselda 3931	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) ∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ ℝ)
24		elicopnf 13359	. . . . . . . . . . . . . . 15 ⊢ (𝐵 ∈ ℝ → (𝑥 ∈ (𝐵[,)+∞) ↔ (𝑥 ∈ ℝ ∧ 𝐵 ≤ 𝑥)))
25	24	baibd 539	. . . . . . . . . . . . . 14 ⊢ ((𝐵 ∈ ℝ ∧ 𝑥 ∈ ℝ) → (𝑥 ∈ (𝐵[,)+∞) ↔ 𝐵 ≤ 𝑥))
26	21, 23, 25	syl2anc 584	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) ∧ 𝑥 ∈ 𝐴) → (𝑥 ∈ (𝐵[,)+∞) ↔ 𝐵 ≤ 𝑥))
27	26	anbi1d 631	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) ∧ 𝑥 ∈ 𝐴) → ((𝑥 ∈ (𝐵[,)+∞) ∧ 𝑦 ≤ 𝑥) ↔ (𝐵 ≤ 𝑥 ∧ 𝑦 ≤ 𝑥)))
28		simplrl 776	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) ∧ 𝑥 ∈ 𝐴) → 𝑦 ∈ ℝ)
29		maxle 13104	. . . . . . . . . . . . 13 ⊢ ((𝐵 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 ∈ ℝ) → (if(𝐵 ≤ 𝑦, 𝑦, 𝐵) ≤ 𝑥 ↔ (𝐵 ≤ 𝑥 ∧ 𝑦 ≤ 𝑥)))
30	21, 28, 23, 29	syl3anc 1373	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) ∧ 𝑥 ∈ 𝐴) → (if(𝐵 ≤ 𝑦, 𝑦, 𝐵) ≤ 𝑥 ↔ (𝐵 ≤ 𝑥 ∧ 𝑦 ≤ 𝑥)))
31	27, 30	bitr4d 282	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) ∧ 𝑥 ∈ 𝐴) → ((𝑥 ∈ (𝐵[,)+∞) ∧ 𝑦 ≤ 𝑥) ↔ if(𝐵 ≤ 𝑦, 𝑦, 𝐵) ≤ 𝑥))
32	31	imbi1d 341	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) ∧ 𝑥 ∈ 𝐴) → (((𝑥 ∈ (𝐵[,)+∞) ∧ 𝑦 ≤ 𝑥) → (𝐹‘𝑥) ≤ 𝑧) ↔ (if(𝐵 ≤ 𝑦, 𝑦, 𝐵) ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧)))
33	19, 32	bitr3id 285	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) ∧ 𝑥 ∈ 𝐴) → ((𝑥 ∈ (𝐵[,)+∞) → (𝑦 ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧)) ↔ (if(𝐵 ≤ 𝑦, 𝑦, 𝐵) ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧)))
34	33	pm5.74da 803	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) → ((𝑥 ∈ 𝐴 → (𝑥 ∈ (𝐵[,)+∞) → (𝑦 ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧))) ↔ (𝑥 ∈ 𝐴 → (if(𝐵 ≤ 𝑦, 𝑦, 𝐵) ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧))))
35	18, 34	bitrid 283	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) → ((𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞)) → (𝑦 ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧)) ↔ (𝑥 ∈ 𝐴 → (if(𝐵 ≤ 𝑦, 𝑦, 𝐵) ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧))))
36	35	ralbidv2 3153	. . . . . 6 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) → (∀𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞))(𝑦 ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧) ↔ ∀𝑥 ∈ 𝐴 (if(𝐵 ≤ 𝑦, 𝑦, 𝐵) ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧)))
37	2	adantr 480	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) → 𝐹:𝐴⟶ℝ)
38		simprl 770	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) → 𝑦 ∈ ℝ)
39	20	adantr 480	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) → 𝐵 ∈ ℝ)
40	38, 39	ifcld 4524	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) → if(𝐵 ≤ 𝑦, 𝑦, 𝐵) ∈ ℝ)
41		simprr 772	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) → 𝑧 ∈ ℝ)
42		ello12r 15438	. . . . . . . 8 ⊢ (((𝐹:𝐴⟶ℝ ∧ 𝐴 ⊆ ℝ) ∧ (if(𝐵 ≤ 𝑦, 𝑦, 𝐵) ∈ ℝ ∧ 𝑧 ∈ ℝ) ∧ ∀𝑥 ∈ 𝐴 (if(𝐵 ≤ 𝑦, 𝑦, 𝐵) ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧)) → 𝐹 ∈ ≤𝑂(1))
43	42	3expia 1121	. . . . . . 7 ⊢ (((𝐹:𝐴⟶ℝ ∧ 𝐴 ⊆ ℝ) ∧ (if(𝐵 ≤ 𝑦, 𝑦, 𝐵) ∈ ℝ ∧ 𝑧 ∈ ℝ)) → (∀𝑥 ∈ 𝐴 (if(𝐵 ≤ 𝑦, 𝑦, 𝐵) ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧) → 𝐹 ∈ ≤𝑂(1)))
44	37, 22, 40, 41, 43	syl22anc 838	. . . . . 6 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) → (∀𝑥 ∈ 𝐴 (if(𝐵 ≤ 𝑦, 𝑦, 𝐵) ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧) → 𝐹 ∈ ≤𝑂(1)))
45	36, 44	sylbid 240	. . . . 5 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) → (∀𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞))(𝑦 ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧) → 𝐹 ∈ ≤𝑂(1)))
46	45	rexlimdvva 3191	. . . 4 ⊢ (𝜑 → (∃𝑦 ∈ ℝ ∃𝑧 ∈ ℝ ∀𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞))(𝑦 ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧) → 𝐹 ∈ ≤𝑂(1)))
47	14, 46	sylbid 240	. . 3 ⊢ (𝜑 → ((𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞)) ↦ (𝐹‘𝑥)) ∈ ≤𝑂(1) → 𝐹 ∈ ≤𝑂(1)))
48	7, 47	sylbid 240	. 2 ⊢ (𝜑 → ((𝐹 ↾ (𝐵[,)+∞)) ∈ ≤𝑂(1) → 𝐹 ∈ ≤𝑂(1)))
49	1, 48	impbid2 226	1 ⊢ (𝜑 → (𝐹 ∈ ≤𝑂(1) ↔ (𝐹 ↾ (𝐵[,)+∞)) ∈ ≤𝑂(1)))

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395   ∈ wcel 2113  ∀wral 3049  ∃wrex 3058   ∩ cin 3898   ⊆ wss 3899  ifcif 4477   class class class wbr 5096   ↦ cmpt 5177   ↾ cres 5624  ⟶wf 6486  ‘cfv 6490  (class class class)co 7356  ℝcr 11023  +∞cpnf 11161   ≤ cle 11165  [,)cico 13261  ≤𝑂(1)clo1 15408

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-10 2146  ax-11 2162  ax-12 2182  ax-ext 2706  ax-sep 5239  ax-nul 5249  ax-pow 5308  ax-pr 5375  ax-un 7678  ax-cnex 11080  ax-resscn 11081  ax-pre-lttri 11098  ax-pre-lttrn 11099

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2537  df-eu 2567  df-clab 2713  df-cleq 2726  df-clel 2809  df-nfc 2883  df-ne 2931  df-nel 3035  df-ral 3050  df-rex 3059  df-rab 3398  df-v 3440  df-sbc 3739  df-csb 3848  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4284  df-if 4478  df-pw 4554  df-sn 4579  df-pr 4581  df-op 4585  df-uni 4862  df-br 5097  df-opab 5159  df-mpt 5178  df-id 5517  df-po 5530  df-so 5531  df-xp 5628  df-rel 5629  df-cnv 5630  df-co 5631  df-dm 5632  df-rn 5633  df-res 5634  df-ima 5635  df-iota 6446  df-fun 6492  df-fn 6493  df-f 6494  df-f1 6495  df-fo 6496  df-f1o 6497  df-fv 6498  df-ov 7359  df-oprab 7360  df-mpo 7361  df-er 8633  df-pm 8764  df-en 8882  df-dom 8883  df-sdom 8884  df-pnf 11166  df-mnf 11167  df-xr 11168  df-ltxr 11169  df-le 11170  df-ico 13265  df-lo1 15412

This theorem is referenced by:  lo1eq  15489