climrescn - Mathbox for Glauco Siliprandi

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Theorem climrescn 44915

Description: A sequence converging w.r.t. the standard topology on the complex numbers, eventually becomes a sequence of complex numbers. (Contributed by Glauco Siliprandi, 5-Feb-2022.)

**Hypotheses**
Ref	Expression
climrescn.m	⊢ (𝜑 → 𝑀 ∈ ℤ)
climrescn.z	⊢ 𝑍 = (ℤ_≥‘𝑀)
climrescn.f	⊢ (𝜑 → 𝐹 Fn 𝑍)
climrescn.c	⊢ (𝜑 → 𝐹 ∈ dom ⇝ )

**Assertion**
Ref	Expression
climrescn	⊢ (𝜑 → ∃𝑗 ∈ 𝑍 (𝐹 ↾ (ℤ_≥‘𝑗)):(ℤ_≥‘𝑗)⟶ℂ)

Distinct variable groups: 𝑗,𝐹 𝑗,𝑍 Allowed substitution hints: 𝜑(𝑗) 𝑀(𝑗)

Proof of Theorem climrescn Dummy variables 𝑖 𝑘 𝑥 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		nfv 1909	. . . . . 6 ⊢ Ⅎ𝑘(𝜑 ∧ 𝑖 ∈ 𝑍)
2		nfra1 3273	. . . . . 6 ⊢ Ⅎ𝑘∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1)
3	1, 2	nfan 1894	. . . . 5 ⊢ Ⅎ𝑘((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1))
4		climrescn.z	. . . . . . . . . 10 ⊢ 𝑍 = (ℤ_≥‘𝑀)
5	4	uztrn2 12837	. . . . . . . . 9 ⊢ ((𝑖 ∈ 𝑍 ∧ 𝑘 ∈ (ℤ_≥‘𝑖)) → 𝑘 ∈ 𝑍)
6	5	adantll 711	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ 𝑘 ∈ (ℤ_≥‘𝑖)) → 𝑘 ∈ 𝑍)
7		climrescn.f	. . . . . . . . . 10 ⊢ (𝜑 → 𝐹 Fn 𝑍)
8	7	fndmd 6644	. . . . . . . . 9 ⊢ (𝜑 → dom 𝐹 = 𝑍)
9	8	ad2antrr 723	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ 𝑘 ∈ (ℤ_≥‘𝑖)) → dom 𝐹 = 𝑍)
10	6, 9	eleqtrrd 2828	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ 𝑘 ∈ (ℤ_≥‘𝑖)) → 𝑘 ∈ dom 𝐹)
11	10	adantlr 712	. . . . . 6 ⊢ ((((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1)) ∧ 𝑘 ∈ (ℤ_≥‘𝑖)) → 𝑘 ∈ dom 𝐹)
12		rspa 3237	. . . . . . . . 9 ⊢ ((∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1) ∧ 𝑘 ∈ (ℤ_≥‘𝑖)) → ((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1))
13	12	adantll 711	. . . . . . . 8 ⊢ (((𝑖 ∈ 𝑍 ∧ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1)) ∧ 𝑘 ∈ (ℤ_≥‘𝑖)) → ((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1))
14	13	simpld 494	. . . . . . 7 ⊢ (((𝑖 ∈ 𝑍 ∧ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1)) ∧ 𝑘 ∈ (ℤ_≥‘𝑖)) → (𝐹‘𝑘) ∈ ℂ)
15	14	adantlll 715	. . . . . 6 ⊢ ((((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1)) ∧ 𝑘 ∈ (ℤ_≥‘𝑖)) → (𝐹‘𝑘) ∈ ℂ)
16	11, 15	jca 511	. . . . 5 ⊢ ((((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1)) ∧ 𝑘 ∈ (ℤ_≥‘𝑖)) → (𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ℂ))
17	3, 16	ralrimia 3247	. . . 4 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1)) → ∀𝑘 ∈ (ℤ_≥‘𝑖)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ℂ))
18		fnfun 6639	. . . . . 6 ⊢ (𝐹 Fn 𝑍 → Fun 𝐹)
19		ffvresb 7116	. . . . . 6 ⊢ (Fun 𝐹 → ((𝐹 ↾ (ℤ_≥‘𝑖)):(ℤ_≥‘𝑖)⟶ℂ ↔ ∀𝑘 ∈ (ℤ_≥‘𝑖)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ℂ)))
20	7, 18, 19	3syl 18	. . . . 5 ⊢ (𝜑 → ((𝐹 ↾ (ℤ_≥‘𝑖)):(ℤ_≥‘𝑖)⟶ℂ ↔ ∀𝑘 ∈ (ℤ_≥‘𝑖)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ℂ)))
21	20	ad2antrr 723	. . . 4 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1)) → ((𝐹 ↾ (ℤ_≥‘𝑖)):(ℤ_≥‘𝑖)⟶ℂ ↔ ∀𝑘 ∈ (ℤ_≥‘𝑖)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ℂ)))
22	17, 21	mpbird 257	. . 3 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1)) → (𝐹 ↾ (ℤ_≥‘𝑖)):(ℤ_≥‘𝑖)⟶ℂ)
23		breq2 5142	. . . . . . 7 ⊢ (𝑥 = 1 → ((abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 𝑥 ↔ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1))
24	23	anbi2d 628	. . . . . 6 ⊢ (𝑥 = 1 → (((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 𝑥) ↔ ((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1)))
25	24	rexralbidv 3212	. . . . 5 ⊢ (𝑥 = 1 → (∃𝑖 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 𝑥) ↔ ∃𝑖 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1)))
26		climrescn.c	. . . . . . . 8 ⊢ (𝜑 → 𝐹 ∈ dom ⇝ )
27		climdm 15494	. . . . . . . 8 ⊢ (𝐹 ∈ dom ⇝ ↔ 𝐹 ⇝ ( ⇝ ‘𝐹))
28	26, 27	sylib 217	. . . . . . 7 ⊢ (𝜑 → 𝐹 ⇝ ( ⇝ ‘𝐹))
29		eqidd 2725	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ ℤ) → (𝐹‘𝑘) = (𝐹‘𝑘))
30	26, 29	clim 15434	. . . . . . 7 ⊢ (𝜑 → (𝐹 ⇝ ( ⇝ ‘𝐹) ↔ (( ⇝ ‘𝐹) ∈ ℂ ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑖 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 𝑥))))
31	28, 30	mpbid 231	. . . . . 6 ⊢ (𝜑 → (( ⇝ ‘𝐹) ∈ ℂ ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑖 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 𝑥)))
32	31	simprd 495	. . . . 5 ⊢ (𝜑 → ∀𝑥 ∈ ℝ⁺ ∃𝑖 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 𝑥))
33		1rp 12974	. . . . . 6 ⊢ 1 ∈ ℝ⁺
34	33	a1i 11	. . . . 5 ⊢ (𝜑 → 1 ∈ ℝ⁺)
35	25, 32, 34	rspcdva 3605	. . . 4 ⊢ (𝜑 → ∃𝑖 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1))
36		climrescn.m	. . . . 5 ⊢ (𝜑 → 𝑀 ∈ ℤ)
37	4	rexuz3 15291	. . . . 5 ⊢ (𝑀 ∈ ℤ → (∃𝑖 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1) ↔ ∃𝑖 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1)))
38	36, 37	syl 17	. . . 4 ⊢ (𝜑 → (∃𝑖 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1) ↔ ∃𝑖 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1)))
39	35, 38	mpbird 257	. . 3 ⊢ (𝜑 → ∃𝑖 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1))
40	22, 39	reximddv3 44294	. 2 ⊢ (𝜑 → ∃𝑖 ∈ 𝑍 (𝐹 ↾ (ℤ_≥‘𝑖)):(ℤ_≥‘𝑖)⟶ℂ)
41		fveq2 6881	. . . . 5 ⊢ (𝑗 = 𝑖 → (ℤ_≥‘𝑗) = (ℤ_≥‘𝑖))
42	41	reseq2d 5971	. . . 4 ⊢ (𝑗 = 𝑖 → (𝐹 ↾ (ℤ_≥‘𝑗)) = (𝐹 ↾ (ℤ_≥‘𝑖)))
43	42, 41	feq12d 6695	. . 3 ⊢ (𝑗 = 𝑖 → ((𝐹 ↾ (ℤ_≥‘𝑗)):(ℤ_≥‘𝑗)⟶ℂ ↔ (𝐹 ↾ (ℤ_≥‘𝑖)):(ℤ_≥‘𝑖)⟶ℂ))
44	43	cbvrexvw 3227	. 2 ⊢ (∃𝑗 ∈ 𝑍 (𝐹 ↾ (ℤ_≥‘𝑗)):(ℤ_≥‘𝑗)⟶ℂ ↔ ∃𝑖 ∈ 𝑍 (𝐹 ↾ (ℤ_≥‘𝑖)):(ℤ_≥‘𝑖)⟶ℂ)
45	40, 44	sylibr 233	1 ⊢ (𝜑 → ∃𝑗 ∈ 𝑍 (𝐹 ↾ (ℤ_≥‘𝑗)):(ℤ_≥‘𝑗)⟶ℂ)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 = wceq 1533 ∈ wcel 2098 ∀wral 3053 ∃wrex 3062 class class class wbr 5138 dom cdm 5666 ↾ cres 5668 Fun wfun 6527 Fn wfn 6528 ⟶wf 6529 ‘cfv 6533 (class class class)co 7401 ℂcc 11103 1c1 11106 < clt 11244 − cmin 11440 ℤcz 12554 ℤ_≥cuz 12818 ℝ⁺crp 12970 abscabs 15177 ⇝ cli 15424

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2695 ax-sep 5289 ax-nul 5296 ax-pow 5353 ax-pr 5417 ax-un 7718 ax-cnex 11161 ax-resscn 11162 ax-1cn 11163 ax-icn 11164 ax-addcl 11165 ax-addrcl 11166 ax-mulcl 11167 ax-mulrcl 11168 ax-mulcom 11169 ax-addass 11170 ax-mulass 11171 ax-distr 11172 ax-i2m1 11173 ax-1ne0 11174 ax-1rid 11175 ax-rnegex 11176 ax-rrecex 11177 ax-cnre 11178 ax-pre-lttri 11179 ax-pre-lttrn 11180 ax-pre-ltadd 11181 ax-pre-mulgt0 11182 ax-pre-sup 11183

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2526 df-eu 2555 df-clab 2702 df-cleq 2716 df-clel 2802 df-nfc 2877 df-ne 2933 df-nel 3039 df-ral 3054 df-rex 3063 df-rmo 3368 df-reu 3369 df-rab 3425 df-v 3468 df-sbc 3770 df-csb 3886 df-dif 3943 df-un 3945 df-in 3947 df-ss 3957 df-pss 3959 df-nul 4315 df-if 4521 df-pw 4596 df-sn 4621 df-pr 4623 df-op 4627 df-uni 4900 df-iun 4989 df-br 5139 df-opab 5201 df-mpt 5222 df-tr 5256 df-id 5564 df-eprel 5570 df-po 5578 df-so 5579 df-fr 5621 df-we 5623 df-xp 5672 df-rel 5673 df-cnv 5674 df-co 5675 df-dm 5676 df-rn 5677 df-res 5678 df-ima 5679 df-pred 6290 df-ord 6357 df-on 6358 df-lim 6359 df-suc 6360 df-iota 6485 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-riota 7357 df-ov 7404 df-oprab 7405 df-mpo 7406 df-om 7849 df-2nd 7969 df-frecs 8261 df-wrecs 8292 df-recs 8366 df-rdg 8405 df-er 8698 df-en 8935 df-dom 8936 df-sdom 8937 df-sup 9432 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-div 11868 df-nn 12209 df-2 12271 df-3 12272 df-n0 12469 df-z 12555 df-uz 12819 df-rp 12971 df-seq 13963 df-exp 14024 df-cj 15042 df-re 15043 df-im 15044 df-sqrt 15178 df-abs 15179 df-clim 15428

This theorem is referenced by: climxlim2 45013

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