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Mirrors > Home > MPE Home > Th. List > Mathboxes > lmclim2 | Structured version Visualization version GIF version |
Description: A sequence in a metric space converges to a point iff the distance between the point and the elements of the sequence converges to 0. (Contributed by Jeff Madsen, 2-Sep-2009.) (Proof shortened by Mario Carneiro, 5-Jun-2014.) |
Ref | Expression |
---|---|
lmclim2.2 | ⊢ (𝜑 → 𝐷 ∈ (Met‘𝑋)) |
lmclim2.3 | ⊢ (𝜑 → 𝐹:ℕ⟶𝑋) |
lmclim2.4 | ⊢ 𝐽 = (MetOpen‘𝐷) |
lmclim2.5 | ⊢ 𝐺 = (𝑥 ∈ ℕ ↦ ((𝐹‘𝑥)𝐷𝑌)) |
lmclim2.6 | ⊢ (𝜑 → 𝑌 ∈ 𝑋) |
Ref | Expression |
---|---|
lmclim2 | ⊢ (𝜑 → (𝐹(⇝𝑡‘𝐽)𝑌 ↔ 𝐺 ⇝ 0)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | lmclim2.4 | . . 3 ⊢ 𝐽 = (MetOpen‘𝐷) | |
2 | lmclim2.2 | . . . 4 ⊢ (𝜑 → 𝐷 ∈ (Met‘𝑋)) | |
3 | metxmet 22871 | . . . 4 ⊢ (𝐷 ∈ (Met‘𝑋) → 𝐷 ∈ (∞Met‘𝑋)) | |
4 | 2, 3 | syl 17 | . . 3 ⊢ (𝜑 → 𝐷 ∈ (∞Met‘𝑋)) |
5 | nnuz 12269 | . . 3 ⊢ ℕ = (ℤ≥‘1) | |
6 | 1zzd 12001 | . . 3 ⊢ (𝜑 → 1 ∈ ℤ) | |
7 | eqidd 2819 | . . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → (𝐹‘𝑘) = (𝐹‘𝑘)) | |
8 | lmclim2.3 | . . 3 ⊢ (𝜑 → 𝐹:ℕ⟶𝑋) | |
9 | 1, 4, 5, 6, 7, 8 | lmmbrf 23792 | . 2 ⊢ (𝜑 → (𝐹(⇝𝑡‘𝐽)𝑌 ↔ (𝑌 ∈ 𝑋 ∧ ∀𝑥 ∈ ℝ+ ∃𝑗 ∈ ℕ ∀𝑘 ∈ (ℤ≥‘𝑗)((𝐹‘𝑘)𝐷𝑌) < 𝑥))) |
10 | lmclim2.5 | . . . . . 6 ⊢ 𝐺 = (𝑥 ∈ ℕ ↦ ((𝐹‘𝑥)𝐷𝑌)) | |
11 | nnex 11632 | . . . . . . 7 ⊢ ℕ ∈ V | |
12 | 11 | mptex 6977 | . . . . . 6 ⊢ (𝑥 ∈ ℕ ↦ ((𝐹‘𝑥)𝐷𝑌)) ∈ V |
13 | 10, 12 | eqeltri 2906 | . . . . 5 ⊢ 𝐺 ∈ V |
14 | 13 | a1i 11 | . . . 4 ⊢ (𝜑 → 𝐺 ∈ V) |
15 | fveq2 6663 | . . . . . . 7 ⊢ (𝑥 = 𝑘 → (𝐹‘𝑥) = (𝐹‘𝑘)) | |
16 | 15 | oveq1d 7160 | . . . . . 6 ⊢ (𝑥 = 𝑘 → ((𝐹‘𝑥)𝐷𝑌) = ((𝐹‘𝑘)𝐷𝑌)) |
17 | ovex 7178 | . . . . . 6 ⊢ ((𝐹‘𝑘)𝐷𝑌) ∈ V | |
18 | 16, 10, 17 | fvmpt 6761 | . . . . 5 ⊢ (𝑘 ∈ ℕ → (𝐺‘𝑘) = ((𝐹‘𝑘)𝐷𝑌)) |
19 | 18 | adantl 482 | . . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → (𝐺‘𝑘) = ((𝐹‘𝑘)𝐷𝑌)) |
20 | 2 | adantr 481 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → 𝐷 ∈ (Met‘𝑋)) |
21 | 8 | ffvelrnda 6843 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → (𝐹‘𝑘) ∈ 𝑋) |
22 | lmclim2.6 | . . . . . . 7 ⊢ (𝜑 → 𝑌 ∈ 𝑋) | |
23 | 22 | adantr 481 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → 𝑌 ∈ 𝑋) |
24 | metcl 22869 | . . . . . 6 ⊢ ((𝐷 ∈ (Met‘𝑋) ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ 𝑌 ∈ 𝑋) → ((𝐹‘𝑘)𝐷𝑌) ∈ ℝ) | |
25 | 20, 21, 23, 24 | syl3anc 1363 | . . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → ((𝐹‘𝑘)𝐷𝑌) ∈ ℝ) |
26 | 25 | recnd 10657 | . . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → ((𝐹‘𝑘)𝐷𝑌) ∈ ℂ) |
27 | 5, 6, 14, 19, 26 | clim0c 14852 | . . 3 ⊢ (𝜑 → (𝐺 ⇝ 0 ↔ ∀𝑥 ∈ ℝ+ ∃𝑗 ∈ ℕ ∀𝑘 ∈ (ℤ≥‘𝑗)(abs‘((𝐹‘𝑘)𝐷𝑌)) < 𝑥)) |
28 | eluznn 12306 | . . . . . . . 8 ⊢ ((𝑗 ∈ ℕ ∧ 𝑘 ∈ (ℤ≥‘𝑗)) → 𝑘 ∈ ℕ) | |
29 | metge0 22882 | . . . . . . . . . . 11 ⊢ ((𝐷 ∈ (Met‘𝑋) ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ 𝑌 ∈ 𝑋) → 0 ≤ ((𝐹‘𝑘)𝐷𝑌)) | |
30 | 20, 21, 23, 29 | syl3anc 1363 | . . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → 0 ≤ ((𝐹‘𝑘)𝐷𝑌)) |
31 | 25, 30 | absidd 14770 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → (abs‘((𝐹‘𝑘)𝐷𝑌)) = ((𝐹‘𝑘)𝐷𝑌)) |
32 | 31 | breq1d 5067 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → ((abs‘((𝐹‘𝑘)𝐷𝑌)) < 𝑥 ↔ ((𝐹‘𝑘)𝐷𝑌) < 𝑥)) |
33 | 28, 32 | sylan2 592 | . . . . . . 7 ⊢ ((𝜑 ∧ (𝑗 ∈ ℕ ∧ 𝑘 ∈ (ℤ≥‘𝑗))) → ((abs‘((𝐹‘𝑘)𝐷𝑌)) < 𝑥 ↔ ((𝐹‘𝑘)𝐷𝑌) < 𝑥)) |
34 | 33 | anassrs 468 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑗 ∈ ℕ) ∧ 𝑘 ∈ (ℤ≥‘𝑗)) → ((abs‘((𝐹‘𝑘)𝐷𝑌)) < 𝑥 ↔ ((𝐹‘𝑘)𝐷𝑌) < 𝑥)) |
35 | 34 | ralbidva 3193 | . . . . 5 ⊢ ((𝜑 ∧ 𝑗 ∈ ℕ) → (∀𝑘 ∈ (ℤ≥‘𝑗)(abs‘((𝐹‘𝑘)𝐷𝑌)) < 𝑥 ↔ ∀𝑘 ∈ (ℤ≥‘𝑗)((𝐹‘𝑘)𝐷𝑌) < 𝑥)) |
36 | 35 | rexbidva 3293 | . . . 4 ⊢ (𝜑 → (∃𝑗 ∈ ℕ ∀𝑘 ∈ (ℤ≥‘𝑗)(abs‘((𝐹‘𝑘)𝐷𝑌)) < 𝑥 ↔ ∃𝑗 ∈ ℕ ∀𝑘 ∈ (ℤ≥‘𝑗)((𝐹‘𝑘)𝐷𝑌) < 𝑥)) |
37 | 36 | ralbidv 3194 | . . 3 ⊢ (𝜑 → (∀𝑥 ∈ ℝ+ ∃𝑗 ∈ ℕ ∀𝑘 ∈ (ℤ≥‘𝑗)(abs‘((𝐹‘𝑘)𝐷𝑌)) < 𝑥 ↔ ∀𝑥 ∈ ℝ+ ∃𝑗 ∈ ℕ ∀𝑘 ∈ (ℤ≥‘𝑗)((𝐹‘𝑘)𝐷𝑌) < 𝑥)) |
38 | 22 | biantrurd 533 | . . 3 ⊢ (𝜑 → (∀𝑥 ∈ ℝ+ ∃𝑗 ∈ ℕ ∀𝑘 ∈ (ℤ≥‘𝑗)((𝐹‘𝑘)𝐷𝑌) < 𝑥 ↔ (𝑌 ∈ 𝑋 ∧ ∀𝑥 ∈ ℝ+ ∃𝑗 ∈ ℕ ∀𝑘 ∈ (ℤ≥‘𝑗)((𝐹‘𝑘)𝐷𝑌) < 𝑥))) |
39 | 27, 37, 38 | 3bitrrd 307 | . 2 ⊢ (𝜑 → ((𝑌 ∈ 𝑋 ∧ ∀𝑥 ∈ ℝ+ ∃𝑗 ∈ ℕ ∀𝑘 ∈ (ℤ≥‘𝑗)((𝐹‘𝑘)𝐷𝑌) < 𝑥) ↔ 𝐺 ⇝ 0)) |
40 | 9, 39 | bitrd 280 | 1 ⊢ (𝜑 → (𝐹(⇝𝑡‘𝐽)𝑌 ↔ 𝐺 ⇝ 0)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 207 ∧ wa 396 = wceq 1528 ∈ wcel 2105 ∀wral 3135 ∃wrex 3136 Vcvv 3492 class class class wbr 5057 ↦ cmpt 5137 ⟶wf 6344 ‘cfv 6348 (class class class)co 7145 ℝcr 10524 0cc0 10525 1c1 10526 < clt 10663 ≤ cle 10664 ℕcn 11626 ℤ≥cuz 12231 ℝ+crp 12377 abscabs 14581 ⇝ cli 14829 ∞Metcxmet 20458 Metcmet 20459 MetOpencmopn 20463 ⇝𝑡clm 21762 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1787 ax-4 1801 ax-5 1902 ax-6 1961 ax-7 2006 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2151 ax-12 2167 ax-ext 2790 ax-rep 5181 ax-sep 5194 ax-nul 5201 ax-pow 5257 ax-pr 5320 ax-un 7450 ax-cnex 10581 ax-resscn 10582 ax-1cn 10583 ax-icn 10584 ax-addcl 10585 ax-addrcl 10586 ax-mulcl 10587 ax-mulrcl 10588 ax-mulcom 10589 ax-addass 10590 ax-mulass 10591 ax-distr 10592 ax-i2m1 10593 ax-1ne0 10594 ax-1rid 10595 ax-rnegex 10596 ax-rrecex 10597 ax-cnre 10598 ax-pre-lttri 10599 ax-pre-lttrn 10600 ax-pre-ltadd 10601 ax-pre-mulgt0 10602 ax-pre-sup 10603 |
This theorem depends on definitions: df-bi 208 df-an 397 df-or 842 df-3or 1080 df-3an 1081 df-tru 1531 df-ex 1772 df-nf 1776 df-sb 2061 df-mo 2615 df-eu 2647 df-clab 2797 df-cleq 2811 df-clel 2890 df-nfc 2960 df-ne 3014 df-nel 3121 df-ral 3140 df-rex 3141 df-reu 3142 df-rmo 3143 df-rab 3144 df-v 3494 df-sbc 3770 df-csb 3881 df-dif 3936 df-un 3938 df-in 3940 df-ss 3949 df-pss 3951 df-nul 4289 df-if 4464 df-pw 4537 df-sn 4558 df-pr 4560 df-tp 4562 df-op 4564 df-uni 4831 df-iun 4912 df-br 5058 df-opab 5120 df-mpt 5138 df-tr 5164 df-id 5453 df-eprel 5458 df-po 5467 df-so 5468 df-fr 5507 df-we 5509 df-xp 5554 df-rel 5555 df-cnv 5556 df-co 5557 df-dm 5558 df-rn 5559 df-res 5560 df-ima 5561 df-pred 6141 df-ord 6187 df-on 6188 df-lim 6189 df-suc 6190 df-iota 6307 df-fun 6350 df-fn 6351 df-f 6352 df-f1 6353 df-fo 6354 df-f1o 6355 df-fv 6356 df-riota 7103 df-ov 7148 df-oprab 7149 df-mpo 7150 df-om 7570 df-1st 7678 df-2nd 7679 df-wrecs 7936 df-recs 7997 df-rdg 8035 df-er 8278 df-map 8397 df-pm 8398 df-en 8498 df-dom 8499 df-sdom 8500 df-sup 8894 df-inf 8895 df-pnf 10665 df-mnf 10666 df-xr 10667 df-ltxr 10668 df-le 10669 df-sub 10860 df-neg 10861 df-div 11286 df-nn 11627 df-2 11688 df-3 11689 df-n0 11886 df-z 11970 df-uz 12232 df-q 12337 df-rp 12378 df-xneg 12495 df-xadd 12496 df-xmul 12497 df-seq 13358 df-exp 13418 df-cj 14446 df-re 14447 df-im 14448 df-sqrt 14582 df-abs 14583 df-clim 14833 df-topgen 16705 df-psmet 20465 df-xmet 20466 df-met 20467 df-bl 20468 df-mopn 20469 df-top 21430 df-topon 21447 df-bases 21482 df-lm 21765 |
This theorem is referenced by: (None) |
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