climrescn - Mathbox for Glauco Siliprandi

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Theorem climrescn 44450

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 1917	. . . . . 6 ⊢ Ⅎ𝑘(𝜑 ∧ 𝑖 ∈ 𝑍)
2		nfra1 3281	. . . . . 6 ⊢ Ⅎ𝑘∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1)
3	1, 2	nfan 1902	. . . . 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 712	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ 𝑘 ∈ (ℤ_≥‘𝑖)) → 𝑘 ∈ 𝑍)
7		climrescn.f	. . . . . . . . . 10 ⊢ (𝜑 → 𝐹 Fn 𝑍)
8	7	fndmd 6651	. . . . . . . . 9 ⊢ (𝜑 → dom 𝐹 = 𝑍)
9	8	ad2antrr 724	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ 𝑘 ∈ (ℤ_≥‘𝑖)) → dom 𝐹 = 𝑍)
10	6, 9	eleqtrrd 2836	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ 𝑘 ∈ (ℤ_≥‘𝑖)) → 𝑘 ∈ dom 𝐹)
11	10	adantlr 713	. . . . . 6 ⊢ ((((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1)) ∧ 𝑘 ∈ (ℤ_≥‘𝑖)) → 𝑘 ∈ dom 𝐹)
12		rspa 3245	. . . . . . . . 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 712	. . . . . . . 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 495	. . . . . . 7 ⊢ (((𝑖 ∈ 𝑍 ∧ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1)) ∧ 𝑘 ∈ (ℤ_≥‘𝑖)) → (𝐹‘𝑘) ∈ ℂ)
15	14	adantlll 716	. . . . . 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 512	. . . . 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 3255	. . . 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 6646	. . . . . 6 ⊢ (𝐹 Fn 𝑍 → Fun 𝐹)
19		ffvresb 7120	. . . . . 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 724	. . . 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 256	. . 3 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1)) → (𝐹 ↾ (ℤ_≥‘𝑖)):(ℤ_≥‘𝑖)⟶ℂ)
23		breq2 5151	. . . . . . 7 ⊢ (𝑥 = 1 → ((abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 𝑥 ↔ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1))
24	23	anbi2d 629	. . . . . 6 ⊢ (𝑥 = 1 → (((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 𝑥) ↔ ((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1)))
25	24	rexralbidv 3220	. . . . 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 2733	. . . . . . . 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 496	. . . . 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 3613	. . . 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 256	. . 3 ⊢ (𝜑 → ∃𝑖 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑖)((𝐹‘𝑘) ∈ ℂ ∧ (abs‘((𝐹‘𝑘) − ( ⇝ ‘𝐹))) < 1))
40	22, 39	reximddv3 43825	. 2 ⊢ (𝜑 → ∃𝑖 ∈ 𝑍 (𝐹 ↾ (ℤ_≥‘𝑖)):(ℤ_≥‘𝑖)⟶ℂ)
41		fveq2 6888	. . . . 5 ⊢ (𝑗 = 𝑖 → (ℤ_≥‘𝑗) = (ℤ_≥‘𝑖))
42	41	reseq2d 5979	. . . 4 ⊢ (𝑗 = 𝑖 → (𝐹 ↾ (ℤ_≥‘𝑗)) = (𝐹 ↾ (ℤ_≥‘𝑖)))
43	42, 41	feq12d 6702	. . 3 ⊢ (𝑗 = 𝑖 → ((𝐹 ↾ (ℤ_≥‘𝑗)):(ℤ_≥‘𝑗)⟶ℂ ↔ (𝐹 ↾ (ℤ_≥‘𝑖)):(ℤ_≥‘𝑖)⟶ℂ))
44	43	cbvrexvw 3235	. 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 396 = wceq 1541 ∈ wcel 2106 ∀wral 3061 ∃wrex 3070 class class class wbr 5147 dom cdm 5675 ↾ cres 5677 Fun wfun 6534 Fn wfn 6535 ⟶wf 6536 ‘cfv 6540 (class class class)co 7405 ℂcc 11104 1c1 11107 < 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 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183 ax-pre-sup 11184

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-op 4634 df-uni 4908 df-iun 4998 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-om 7852 df-2nd 7972 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-er 8699 df-en 8936 df-dom 8937 df-sdom 8938 df-sup 9433 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 44548

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