Theorem lo1resb 15526

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 15521	. 2 ⊢ (𝐹 ∈ ≤𝑂(1) → (𝐹 ↾ (𝐵[,)+∞)) ∈ ≤𝑂(1))
2		lo1resb.1	. . . . . . 7 ⊢ (𝜑 → 𝐹:𝐴⟶ℝ)
3	2	feqmptd 6908	. . . . . 6 ⊢ (𝜑 → 𝐹 = (𝑥 ∈ 𝐴 ↦ (𝐹‘𝑥)))
4	3	reseq1d 5943	. . . . 5 ⊢ (𝜑 → (𝐹 ↾ (𝐵[,)+∞)) = ((𝑥 ∈ 𝐴 ↦ (𝐹‘𝑥)) ↾ (𝐵[,)+∞)))
5		resmpt3 6003	. . . . 5 ⊢ ((𝑥 ∈ 𝐴 ↦ (𝐹‘𝑥)) ↾ (𝐵[,)+∞)) = (𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞)) ↦ (𝐹‘𝑥))
6	4, 5	eqtrdi 2787	. . . 4 ⊢ (𝜑 → (𝐹 ↾ (𝐵[,)+∞)) = (𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞)) ↦ (𝐹‘𝑥)))
7	6	eleq1d 2821	. . 3 ⊢ (𝜑 → ((𝐹 ↾ (𝐵[,)+∞)) ∈ ≤𝑂(1) ↔ (𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞)) ↦ (𝐹‘𝑥)) ∈ ≤𝑂(1)))
8		inss1 4177	. . . . . 6 ⊢ (𝐴 ∩ (𝐵[,)+∞)) ⊆ 𝐴
9		lo1resb.2	. . . . . 6 ⊢ (𝜑 → 𝐴 ⊆ ℝ)
10	8, 9	sstrid 3933	. . . . 5 ⊢ (𝜑 → (𝐴 ∩ (𝐵[,)+∞)) ⊆ ℝ)
11		elinel1 4141	. . . . . 6 ⊢ (𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞)) → 𝑥 ∈ 𝐴)
12		ffvelcdm 7033	. . . . . 6 ⊢ ((𝐹:𝐴⟶ℝ ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝑥) ∈ ℝ)
13	2, 11, 12	syl2an 597	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞))) → (𝐹‘𝑥) ∈ ℝ)
14	10, 13	ello1mpt 15483	. . . 4 ⊢ (𝜑 → ((𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞)) ↦ (𝐹‘𝑥)) ∈ ≤𝑂(1) ↔ ∃𝑦 ∈ ℝ ∃𝑧 ∈ ℝ ∀𝑥 ∈ (𝐴 ∩ (𝐵[,)+∞))(𝑦 ≤ 𝑥 → (𝐹‘𝑥) ≤ 𝑧)))
15		elin 3905	. . . . . . . . . 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 727	. . . . . . . . . . . . . 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 3921	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) ∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ ℝ)
24		elicopnf 13398	. . . . . . . . . . . . . . 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 585	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) ∧ 𝑥 ∈ 𝐴) → (𝑥 ∈ (𝐵[,)+∞) ↔ 𝐵 ≤ 𝑥))
27	26	anbi1d 632	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) ∧ 𝑥 ∈ 𝐴) → ((𝑥 ∈ (𝐵[,)+∞) ∧ 𝑦 ≤ 𝑥) ↔ (𝐵 ≤ 𝑥 ∧ 𝑦 ≤ 𝑥)))
28		simplrl 777	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) ∧ 𝑥 ∈ 𝐴) → 𝑦 ∈ ℝ)
29		maxle 13143	. . . . . . . . . . . . 13 ⊢ ((𝐵 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑥 ∈ ℝ) → (if(𝐵 ≤ 𝑦, 𝑦, 𝐵) ≤ 𝑥 ↔ (𝐵 ≤ 𝑥 ∧ 𝑦 ≤ 𝑥)))
30	21, 28, 23, 29	syl3anc 1374	. . . . . . . . . . . 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 804	. . . . . . . 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 3156	. . . . . 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 771	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) → 𝑦 ∈ ℝ)
39	20	adantr 480	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) → 𝐵 ∈ ℝ)
40	38, 39	ifcld 4513	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) → if(𝐵 ≤ 𝑦, 𝑦, 𝐵) ∈ ℝ)
41		simprr 773	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) → 𝑧 ∈ ℝ)
42		ello12r 15479	. . . . . . . 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 1122	. . . . . . 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 839	. . . . . 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 3194	. . . 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 2114  ∀wral 3051  ∃wrex 3061   ∩ cin 3888   ⊆ wss 3889  ifcif 4466   class class class wbr 5085   ↦ cmpt 5166   ↾ cres 5633  ⟶wf 6494  ‘cfv 6498  (class class class)co 7367  ℝcr 11037  +∞cpnf 11176   ≤ cle 11180  [,)cico 13300  ≤𝑂(1)clo1 15449

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 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2708  ax-sep 5231  ax-nul 5241  ax-pow 5307  ax-pr 5375  ax-un 7689  ax-cnex 11094  ax-resscn 11095  ax-pre-lttri 11112  ax-pre-lttrn 11113

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3or 1088  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-nel 3037  df-ral 3052  df-rex 3062  df-rab 3390  df-v 3431  df-sbc 3729  df-csb 3838  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-nul 4274  df-if 4467  df-pw 4543  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4851  df-br 5086  df-opab 5148  df-mpt 5167  df-id 5526  df-po 5539  df-so 5540  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-res 5643  df-ima 5644  df-iota 6454  df-fun 6500  df-fn 6501  df-f 6502  df-f1 6503  df-fo 6504  df-f1o 6505  df-fv 6506  df-ov 7370  df-oprab 7371  df-mpo 7372  df-er 8643  df-pm 8776  df-en 8894  df-dom 8895  df-sdom 8896  df-pnf 11181  df-mnf 11182  df-xr 11183  df-ltxr 11184  df-le 11185  df-ico 13304  df-lo1 15453

This theorem is referenced by:  lo1eq  15530