Theorem rlim3 14229

Description: Restrict the range of the domain bound to reals greater than some 𝐷 ∈ ℝ. (Contributed by Mario Carneiro, 16-Sep-2014.)

Hypotheses

Ref	Expression
rlim2.1	⊢ (𝜑 → ∀𝑧 ∈ 𝐴 𝐵 ∈ ℂ)
rlim2.2	⊢ (𝜑 → 𝐴 ⊆ ℝ)
rlim2.3	⊢ (𝜑 → 𝐶 ∈ ℂ)
rlim3.4	⊢ (𝜑 → 𝐷 ∈ ℝ)

Assertion

Ref	Expression
rlim3	⊢ (𝜑 → ((𝑧 ∈ 𝐴 ↦ 𝐵) ⇝𝑟 𝐶 ↔ ∀𝑥 ∈ ℝ+ ∃𝑦 ∈ (𝐷[,)+∞)∀𝑧 ∈ 𝐴 (𝑦 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥)))

Distinct variable groups:   𝑥,𝑦,𝑧,𝐴   𝑥,𝐵,𝑦   𝑥,𝐶,𝑦,𝑧   𝜑,𝑥,𝑦   𝑦,𝐷,𝑧

Allowed substitution hints:   𝜑(𝑧)   𝐵(𝑧)   𝐷(𝑥)

Proof of Theorem rlim3

Dummy variable 𝑤 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		rlim2.1	. . . 4 ⊢ (𝜑 → ∀𝑧 ∈ 𝐴 𝐵 ∈ ℂ)
2		rlim2.2	. . . 4 ⊢ (𝜑 → 𝐴 ⊆ ℝ)
3		rlim2.3	. . . 4 ⊢ (𝜑 → 𝐶 ∈ ℂ)
4	1, 2, 3	rlim2 14227	. . 3 ⊢ (𝜑 → ((𝑧 ∈ 𝐴 ↦ 𝐵) ⇝𝑟 𝐶 ↔ ∀𝑥 ∈ ℝ+ ∃𝑤 ∈ ℝ ∀𝑧 ∈ 𝐴 (𝑤 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥)))
5		simpr 477	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑤 ∈ ℝ) → 𝑤 ∈ ℝ)
6		rlim3.4	. . . . . . . . 9 ⊢ (𝜑 → 𝐷 ∈ ℝ)
7	6	adantr 481	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑤 ∈ ℝ) → 𝐷 ∈ ℝ)
8	5, 7	ifcld 4131	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑤 ∈ ℝ) → if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ∈ ℝ)
9		max1 12016	. . . . . . . 8 ⊢ ((𝐷 ∈ ℝ ∧ 𝑤 ∈ ℝ) → 𝐷 ≤ if(𝐷 ≤ 𝑤, 𝑤, 𝐷))
10	6, 9	sylan 488	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑤 ∈ ℝ) → 𝐷 ≤ if(𝐷 ≤ 𝑤, 𝑤, 𝐷))
11		elicopnf 12269	. . . . . . . 8 ⊢ (𝐷 ∈ ℝ → (if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ∈ (𝐷[,)+∞) ↔ (if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ∈ ℝ ∧ 𝐷 ≤ if(𝐷 ≤ 𝑤, 𝑤, 𝐷))))
12	7, 11	syl 17	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑤 ∈ ℝ) → (if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ∈ (𝐷[,)+∞) ↔ (if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ∈ ℝ ∧ 𝐷 ≤ if(𝐷 ≤ 𝑤, 𝑤, 𝐷))))
13	8, 10, 12	mpbir2and 957	. . . . . 6 ⊢ ((𝜑 ∧ 𝑤 ∈ ℝ) → if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ∈ (𝐷[,)+∞))
14	2, 6	jca 554	. . . . . . 7 ⊢ (𝜑 → (𝐴 ⊆ ℝ ∧ 𝐷 ∈ ℝ))
15		simpllr 799	. . . . . . . . . . 11 ⊢ ((((𝐴 ⊆ ℝ ∧ 𝐷 ∈ ℝ) ∧ 𝑤 ∈ ℝ) ∧ 𝑧 ∈ 𝐴) → 𝐷 ∈ ℝ)
16		simplr 792	. . . . . . . . . . 11 ⊢ ((((𝐴 ⊆ ℝ ∧ 𝐷 ∈ ℝ) ∧ 𝑤 ∈ ℝ) ∧ 𝑧 ∈ 𝐴) → 𝑤 ∈ ℝ)
17		max2 12018	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ ℝ ∧ 𝑤 ∈ ℝ) → 𝑤 ≤ if(𝐷 ≤ 𝑤, 𝑤, 𝐷))
18	15, 16, 17	syl2anc 693	. . . . . . . . . 10 ⊢ ((((𝐴 ⊆ ℝ ∧ 𝐷 ∈ ℝ) ∧ 𝑤 ∈ ℝ) ∧ 𝑧 ∈ 𝐴) → 𝑤 ≤ if(𝐷 ≤ 𝑤, 𝑤, 𝐷))
19	16, 15	ifcld 4131	. . . . . . . . . . 11 ⊢ ((((𝐴 ⊆ ℝ ∧ 𝐷 ∈ ℝ) ∧ 𝑤 ∈ ℝ) ∧ 𝑧 ∈ 𝐴) → if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ∈ ℝ)
20		simpll 790	. . . . . . . . . . . 12 ⊢ (((𝐴 ⊆ ℝ ∧ 𝐷 ∈ ℝ) ∧ 𝑤 ∈ ℝ) → 𝐴 ⊆ ℝ)
21	20	sselda 3603	. . . . . . . . . . 11 ⊢ ((((𝐴 ⊆ ℝ ∧ 𝐷 ∈ ℝ) ∧ 𝑤 ∈ ℝ) ∧ 𝑧 ∈ 𝐴) → 𝑧 ∈ ℝ)
22		letr 10131	. . . . . . . . . . 11 ⊢ ((𝑤 ∈ ℝ ∧ if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ∈ ℝ ∧ 𝑧 ∈ ℝ) → ((𝑤 ≤ if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ∧ if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ≤ 𝑧) → 𝑤 ≤ 𝑧))
23	16, 19, 21, 22	syl3anc 1326	. . . . . . . . . 10 ⊢ ((((𝐴 ⊆ ℝ ∧ 𝐷 ∈ ℝ) ∧ 𝑤 ∈ ℝ) ∧ 𝑧 ∈ 𝐴) → ((𝑤 ≤ if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ∧ if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ≤ 𝑧) → 𝑤 ≤ 𝑧))
24	18, 23	mpand 711	. . . . . . . . 9 ⊢ ((((𝐴 ⊆ ℝ ∧ 𝐷 ∈ ℝ) ∧ 𝑤 ∈ ℝ) ∧ 𝑧 ∈ 𝐴) → (if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ≤ 𝑧 → 𝑤 ≤ 𝑧))
25	24	imim1d 82	. . . . . . . 8 ⊢ ((((𝐴 ⊆ ℝ ∧ 𝐷 ∈ ℝ) ∧ 𝑤 ∈ ℝ) ∧ 𝑧 ∈ 𝐴) → ((𝑤 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥) → (if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥)))
26	25	ralimdva 2962	. . . . . . 7 ⊢ (((𝐴 ⊆ ℝ ∧ 𝐷 ∈ ℝ) ∧ 𝑤 ∈ ℝ) → (∀𝑧 ∈ 𝐴 (𝑤 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥) → ∀𝑧 ∈ 𝐴 (if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥)))
27	14, 26	sylan 488	. . . . . 6 ⊢ ((𝜑 ∧ 𝑤 ∈ ℝ) → (∀𝑧 ∈ 𝐴 (𝑤 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥) → ∀𝑧 ∈ 𝐴 (if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥)))
28		breq1 4656	. . . . . . . . 9 ⊢ (𝑦 = if(𝐷 ≤ 𝑤, 𝑤, 𝐷) → (𝑦 ≤ 𝑧 ↔ if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ≤ 𝑧))
29	28	imbi1d 331	. . . . . . . 8 ⊢ (𝑦 = if(𝐷 ≤ 𝑤, 𝑤, 𝐷) → ((𝑦 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥) ↔ (if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥)))
30	29	ralbidv 2986	. . . . . . 7 ⊢ (𝑦 = if(𝐷 ≤ 𝑤, 𝑤, 𝐷) → (∀𝑧 ∈ 𝐴 (𝑦 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥) ↔ ∀𝑧 ∈ 𝐴 (if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥)))
31	30	rspcev 3309	. . . . . 6 ⊢ ((if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ∈ (𝐷[,)+∞) ∧ ∀𝑧 ∈ 𝐴 (if(𝐷 ≤ 𝑤, 𝑤, 𝐷) ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥)) → ∃𝑦 ∈ (𝐷[,)+∞)∀𝑧 ∈ 𝐴 (𝑦 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥))
32	13, 27, 31	syl6an 568	. . . . 5 ⊢ ((𝜑 ∧ 𝑤 ∈ ℝ) → (∀𝑧 ∈ 𝐴 (𝑤 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥) → ∃𝑦 ∈ (𝐷[,)+∞)∀𝑧 ∈ 𝐴 (𝑦 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥)))
33	32	rexlimdva 3031	. . . 4 ⊢ (𝜑 → (∃𝑤 ∈ ℝ ∀𝑧 ∈ 𝐴 (𝑤 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥) → ∃𝑦 ∈ (𝐷[,)+∞)∀𝑧 ∈ 𝐴 (𝑦 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥)))
34	33	ralimdv 2963	. . 3 ⊢ (𝜑 → (∀𝑥 ∈ ℝ+ ∃𝑤 ∈ ℝ ∀𝑧 ∈ 𝐴 (𝑤 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥) → ∀𝑥 ∈ ℝ+ ∃𝑦 ∈ (𝐷[,)+∞)∀𝑧 ∈ 𝐴 (𝑦 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥)))
35	4, 34	sylbid 230	. 2 ⊢ (𝜑 → ((𝑧 ∈ 𝐴 ↦ 𝐵) ⇝𝑟 𝐶 → ∀𝑥 ∈ ℝ+ ∃𝑦 ∈ (𝐷[,)+∞)∀𝑧 ∈ 𝐴 (𝑦 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥)))
36		pnfxr 10092	. . . . . 6 ⊢ +∞ ∈ ℝ*
37		icossre 12254	. . . . . 6 ⊢ ((𝐷 ∈ ℝ ∧ +∞ ∈ ℝ*) → (𝐷[,)+∞) ⊆ ℝ)
38	6, 36, 37	sylancl 694	. . . . 5 ⊢ (𝜑 → (𝐷[,)+∞) ⊆ ℝ)
39		ssrexv 3667	. . . . 5 ⊢ ((𝐷[,)+∞) ⊆ ℝ → (∃𝑦 ∈ (𝐷[,)+∞)∀𝑧 ∈ 𝐴 (𝑦 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥) → ∃𝑦 ∈ ℝ ∀𝑧 ∈ 𝐴 (𝑦 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥)))
40	38, 39	syl 17	. . . 4 ⊢ (𝜑 → (∃𝑦 ∈ (𝐷[,)+∞)∀𝑧 ∈ 𝐴 (𝑦 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥) → ∃𝑦 ∈ ℝ ∀𝑧 ∈ 𝐴 (𝑦 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥)))
41	40	ralimdv 2963	. . 3 ⊢ (𝜑 → (∀𝑥 ∈ ℝ+ ∃𝑦 ∈ (𝐷[,)+∞)∀𝑧 ∈ 𝐴 (𝑦 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥) → ∀𝑥 ∈ ℝ+ ∃𝑦 ∈ ℝ ∀𝑧 ∈ 𝐴 (𝑦 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥)))
42	1, 2, 3	rlim2 14227	. . 3 ⊢ (𝜑 → ((𝑧 ∈ 𝐴 ↦ 𝐵) ⇝𝑟 𝐶 ↔ ∀𝑥 ∈ ℝ+ ∃𝑦 ∈ ℝ ∀𝑧 ∈ 𝐴 (𝑦 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥)))
43	41, 42	sylibrd 249	. 2 ⊢ (𝜑 → (∀𝑥 ∈ ℝ+ ∃𝑦 ∈ (𝐷[,)+∞)∀𝑧 ∈ 𝐴 (𝑦 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥) → (𝑧 ∈ 𝐴 ↦ 𝐵) ⇝𝑟 𝐶))
44	35, 43	impbid 202	1 ⊢ (𝜑 → ((𝑧 ∈ 𝐴 ↦ 𝐵) ⇝𝑟 𝐶 ↔ ∀𝑥 ∈ ℝ+ ∃𝑦 ∈ (𝐷[,)+∞)∀𝑧 ∈ 𝐴 (𝑦 ≤ 𝑧 → (abs‘(𝐵 − 𝐶)) < 𝑥)))

Syntax hints:   → wi 4   ↔ wb 196   ∧ wa 384   = wceq 1483   ∈ wcel 1990  ∀wral 2912  ∃wrex 2913   ⊆ wss 3574  ifcif 4086   class class class wbr 4653   ↦ cmpt 4729  ‘cfv 5888  (class class class)co 6650  ℂcc 9934  ℝcr 9935  +∞cpnf 10071  ℝ^*cxr 10073   < clt 10074   ≤ cle 10075   − cmin 10266  ℝ⁺crp 11832  [,)cico 12177  abscabs 13974   ⇝_𝑟 crli 14216

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-pre-lttri 10010  ax-pre-lttrn 10011

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-po 5035  df-so 5036  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-er 7742  df-pm 7860  df-en 7956  df-dom 7957  df-sdom 7958  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-ico 12181  df-rlim 14220

This theorem is referenced by:  rlimresb  14296  rlimsqzlem  14379  rlimcnp  24692  signsply0  30628