Mathbox for Glauco Siliprandi |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > climinf2 | Structured version Visualization version GIF version |
Description: A convergent, nonincreasing sequence, converges to the infimum of its range. (Contributed by Glauco Siliprandi, 23-Oct-2021.) |
Ref | Expression |
---|---|
climinf2.k | ⊢ Ⅎ𝑘𝜑 |
climinf2.n | ⊢ Ⅎ𝑘𝐹 |
climinf2.z | ⊢ 𝑍 = (ℤ≥‘𝑀) |
climinf2.m | ⊢ (𝜑 → 𝑀 ∈ ℤ) |
climinf2.f | ⊢ (𝜑 → 𝐹:𝑍⟶ℝ) |
climinf2.l | ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘(𝑘 + 1)) ≤ (𝐹‘𝑘)) |
climinf2.e | ⊢ (𝜑 → ∃𝑥 ∈ ℝ ∀𝑘 ∈ 𝑍 𝑥 ≤ (𝐹‘𝑘)) |
Ref | Expression |
---|---|
climinf2 | ⊢ (𝜑 → 𝐹 ⇝ inf(ran 𝐹, ℝ*, < )) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | climinf2.z | . 2 ⊢ 𝑍 = (ℤ≥‘𝑀) | |
2 | climinf2.m | . 2 ⊢ (𝜑 → 𝑀 ∈ ℤ) | |
3 | climinf2.f | . 2 ⊢ (𝜑 → 𝐹:𝑍⟶ℝ) | |
4 | climinf2.k | . . . . 5 ⊢ Ⅎ𝑘𝜑 | |
5 | nfv 1906 | . . . . 5 ⊢ Ⅎ𝑘 𝑗 ∈ 𝑍 | |
6 | 4, 5 | nfan 1891 | . . . 4 ⊢ Ⅎ𝑘(𝜑 ∧ 𝑗 ∈ 𝑍) |
7 | climinf2.n | . . . . . 6 ⊢ Ⅎ𝑘𝐹 | |
8 | nfcv 2974 | . . . . . 6 ⊢ Ⅎ𝑘(𝑗 + 1) | |
9 | 7, 8 | nffv 6673 | . . . . 5 ⊢ Ⅎ𝑘(𝐹‘(𝑗 + 1)) |
10 | nfcv 2974 | . . . . 5 ⊢ Ⅎ𝑘 ≤ | |
11 | nfcv 2974 | . . . . . 6 ⊢ Ⅎ𝑘𝑗 | |
12 | 7, 11 | nffv 6673 | . . . . 5 ⊢ Ⅎ𝑘(𝐹‘𝑗) |
13 | 9, 10, 12 | nfbr 5104 | . . . 4 ⊢ Ⅎ𝑘(𝐹‘(𝑗 + 1)) ≤ (𝐹‘𝑗) |
14 | 6, 13 | nfim 1888 | . . 3 ⊢ Ⅎ𝑘((𝜑 ∧ 𝑗 ∈ 𝑍) → (𝐹‘(𝑗 + 1)) ≤ (𝐹‘𝑗)) |
15 | eleq1w 2892 | . . . . 5 ⊢ (𝑘 = 𝑗 → (𝑘 ∈ 𝑍 ↔ 𝑗 ∈ 𝑍)) | |
16 | 15 | anbi2d 628 | . . . 4 ⊢ (𝑘 = 𝑗 → ((𝜑 ∧ 𝑘 ∈ 𝑍) ↔ (𝜑 ∧ 𝑗 ∈ 𝑍))) |
17 | fvoveq1 7168 | . . . . 5 ⊢ (𝑘 = 𝑗 → (𝐹‘(𝑘 + 1)) = (𝐹‘(𝑗 + 1))) | |
18 | fveq2 6663 | . . . . 5 ⊢ (𝑘 = 𝑗 → (𝐹‘𝑘) = (𝐹‘𝑗)) | |
19 | 17, 18 | breq12d 5070 | . . . 4 ⊢ (𝑘 = 𝑗 → ((𝐹‘(𝑘 + 1)) ≤ (𝐹‘𝑘) ↔ (𝐹‘(𝑗 + 1)) ≤ (𝐹‘𝑗))) |
20 | 16, 19 | imbi12d 346 | . . 3 ⊢ (𝑘 = 𝑗 → (((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘(𝑘 + 1)) ≤ (𝐹‘𝑘)) ↔ ((𝜑 ∧ 𝑗 ∈ 𝑍) → (𝐹‘(𝑗 + 1)) ≤ (𝐹‘𝑗)))) |
21 | climinf2.l | . . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘(𝑘 + 1)) ≤ (𝐹‘𝑘)) | |
22 | 14, 20, 21 | chvarfv 2232 | . 2 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝑍) → (𝐹‘(𝑗 + 1)) ≤ (𝐹‘𝑗)) |
23 | climinf2.e | . . 3 ⊢ (𝜑 → ∃𝑥 ∈ ℝ ∀𝑘 ∈ 𝑍 𝑥 ≤ (𝐹‘𝑘)) | |
24 | breq1 5060 | . . . . . 6 ⊢ (𝑥 = 𝑦 → (𝑥 ≤ (𝐹‘𝑘) ↔ 𝑦 ≤ (𝐹‘𝑘))) | |
25 | 24 | ralbidv 3194 | . . . . 5 ⊢ (𝑥 = 𝑦 → (∀𝑘 ∈ 𝑍 𝑥 ≤ (𝐹‘𝑘) ↔ ∀𝑘 ∈ 𝑍 𝑦 ≤ (𝐹‘𝑘))) |
26 | nfv 1906 | . . . . . . 7 ⊢ Ⅎ𝑗 𝑦 ≤ (𝐹‘𝑘) | |
27 | nfcv 2974 | . . . . . . . 8 ⊢ Ⅎ𝑘𝑦 | |
28 | 27, 10, 12 | nfbr 5104 | . . . . . . 7 ⊢ Ⅎ𝑘 𝑦 ≤ (𝐹‘𝑗) |
29 | 18 | breq2d 5069 | . . . . . . 7 ⊢ (𝑘 = 𝑗 → (𝑦 ≤ (𝐹‘𝑘) ↔ 𝑦 ≤ (𝐹‘𝑗))) |
30 | 26, 28, 29 | cbvralw 3439 | . . . . . 6 ⊢ (∀𝑘 ∈ 𝑍 𝑦 ≤ (𝐹‘𝑘) ↔ ∀𝑗 ∈ 𝑍 𝑦 ≤ (𝐹‘𝑗)) |
31 | 30 | a1i 11 | . . . . 5 ⊢ (𝑥 = 𝑦 → (∀𝑘 ∈ 𝑍 𝑦 ≤ (𝐹‘𝑘) ↔ ∀𝑗 ∈ 𝑍 𝑦 ≤ (𝐹‘𝑗))) |
32 | 25, 31 | bitrd 280 | . . . 4 ⊢ (𝑥 = 𝑦 → (∀𝑘 ∈ 𝑍 𝑥 ≤ (𝐹‘𝑘) ↔ ∀𝑗 ∈ 𝑍 𝑦 ≤ (𝐹‘𝑗))) |
33 | 32 | cbvrexvw 3448 | . . 3 ⊢ (∃𝑥 ∈ ℝ ∀𝑘 ∈ 𝑍 𝑥 ≤ (𝐹‘𝑘) ↔ ∃𝑦 ∈ ℝ ∀𝑗 ∈ 𝑍 𝑦 ≤ (𝐹‘𝑗)) |
34 | 23, 33 | sylib 219 | . 2 ⊢ (𝜑 → ∃𝑦 ∈ ℝ ∀𝑗 ∈ 𝑍 𝑦 ≤ (𝐹‘𝑗)) |
35 | 1, 2, 3, 22, 34 | climinf2lem 41863 | 1 ⊢ (𝜑 → 𝐹 ⇝ inf(ran 𝐹, ℝ*, < )) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 207 ∧ wa 396 = wceq 1528 Ⅎwnf 1775 ∈ wcel 2105 Ⅎwnfc 2958 ∀wral 3135 ∃wrex 3136 class class class wbr 5057 ran crn 5549 ⟶wf 6344 ‘cfv 6348 (class class class)co 7145 infcinf 8893 ℝcr 10524 1c1 10526 + caddc 10528 ℝ*cxr 10662 < clt 10663 ≤ cle 10664 ℤcz 11969 ℤ≥cuz 12231 ⇝ cli 14829 |
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-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-rp 12378 df-fz 12881 df-seq 13358 df-exp 13418 df-cj 14446 df-re 14447 df-im 14448 df-sqrt 14582 df-abs 14583 df-clim 14833 |
This theorem is referenced by: climinf2mpt 41871 climinfmpt 41872 climinf3 41873 |
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