Mathbox for Glauco Siliprandi |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > xlimpnf | Structured version Visualization version GIF version |
Description: A function converges to plus infinity if it eventually becomes (and stays) larger than any given real number. (Contributed by Glauco Siliprandi, 5-Feb-2022.) |
Ref | Expression |
---|---|
xlimpnf.k | ⊢ Ⅎ𝑘𝐹 |
xlimpnf.m | ⊢ (𝜑 → 𝑀 ∈ ℤ) |
xlimpnf.z | ⊢ 𝑍 = (ℤ≥‘𝑀) |
xlimpnf.f | ⊢ (𝜑 → 𝐹:𝑍⟶ℝ*) |
Ref | Expression |
---|---|
xlimpnf | ⊢ (𝜑 → (𝐹~~>*+∞ ↔ ∀𝑥 ∈ ℝ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)𝑥 ≤ (𝐹‘𝑘))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | xlimpnf.m | . . 3 ⊢ (𝜑 → 𝑀 ∈ ℤ) | |
2 | xlimpnf.z | . . 3 ⊢ 𝑍 = (ℤ≥‘𝑀) | |
3 | xlimpnf.f | . . 3 ⊢ (𝜑 → 𝐹:𝑍⟶ℝ*) | |
4 | 1, 2, 3 | xlimpnfv 42112 | . 2 ⊢ (𝜑 → (𝐹~~>*+∞ ↔ ∀𝑦 ∈ ℝ ∃𝑖 ∈ 𝑍 ∀𝑙 ∈ (ℤ≥‘𝑖)𝑦 ≤ (𝐹‘𝑙))) |
5 | breq1 5061 | . . . . 5 ⊢ (𝑦 = 𝑥 → (𝑦 ≤ (𝐹‘𝑙) ↔ 𝑥 ≤ (𝐹‘𝑙))) | |
6 | 5 | rexralbidv 3301 | . . . 4 ⊢ (𝑦 = 𝑥 → (∃𝑖 ∈ 𝑍 ∀𝑙 ∈ (ℤ≥‘𝑖)𝑦 ≤ (𝐹‘𝑙) ↔ ∃𝑖 ∈ 𝑍 ∀𝑙 ∈ (ℤ≥‘𝑖)𝑥 ≤ (𝐹‘𝑙))) |
7 | fveq2 6664 | . . . . . . 7 ⊢ (𝑖 = 𝑗 → (ℤ≥‘𝑖) = (ℤ≥‘𝑗)) | |
8 | 7 | raleqdv 3415 | . . . . . 6 ⊢ (𝑖 = 𝑗 → (∀𝑙 ∈ (ℤ≥‘𝑖)𝑥 ≤ (𝐹‘𝑙) ↔ ∀𝑙 ∈ (ℤ≥‘𝑗)𝑥 ≤ (𝐹‘𝑙))) |
9 | nfcv 2977 | . . . . . . . 8 ⊢ Ⅎ𝑘𝑥 | |
10 | nfcv 2977 | . . . . . . . 8 ⊢ Ⅎ𝑘 ≤ | |
11 | xlimpnf.k | . . . . . . . . 9 ⊢ Ⅎ𝑘𝐹 | |
12 | nfcv 2977 | . . . . . . . . 9 ⊢ Ⅎ𝑘𝑙 | |
13 | 11, 12 | nffv 6674 | . . . . . . . 8 ⊢ Ⅎ𝑘(𝐹‘𝑙) |
14 | 9, 10, 13 | nfbr 5105 | . . . . . . 7 ⊢ Ⅎ𝑘 𝑥 ≤ (𝐹‘𝑙) |
15 | nfv 1911 | . . . . . . 7 ⊢ Ⅎ𝑙 𝑥 ≤ (𝐹‘𝑘) | |
16 | fveq2 6664 | . . . . . . . 8 ⊢ (𝑙 = 𝑘 → (𝐹‘𝑙) = (𝐹‘𝑘)) | |
17 | 16 | breq2d 5070 | . . . . . . 7 ⊢ (𝑙 = 𝑘 → (𝑥 ≤ (𝐹‘𝑙) ↔ 𝑥 ≤ (𝐹‘𝑘))) |
18 | 14, 15, 17 | cbvralw 3441 | . . . . . 6 ⊢ (∀𝑙 ∈ (ℤ≥‘𝑗)𝑥 ≤ (𝐹‘𝑙) ↔ ∀𝑘 ∈ (ℤ≥‘𝑗)𝑥 ≤ (𝐹‘𝑘)) |
19 | 8, 18 | syl6bb 289 | . . . . 5 ⊢ (𝑖 = 𝑗 → (∀𝑙 ∈ (ℤ≥‘𝑖)𝑥 ≤ (𝐹‘𝑙) ↔ ∀𝑘 ∈ (ℤ≥‘𝑗)𝑥 ≤ (𝐹‘𝑘))) |
20 | 19 | cbvrexvw 3450 | . . . 4 ⊢ (∃𝑖 ∈ 𝑍 ∀𝑙 ∈ (ℤ≥‘𝑖)𝑥 ≤ (𝐹‘𝑙) ↔ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)𝑥 ≤ (𝐹‘𝑘)) |
21 | 6, 20 | syl6bb 289 | . . 3 ⊢ (𝑦 = 𝑥 → (∃𝑖 ∈ 𝑍 ∀𝑙 ∈ (ℤ≥‘𝑖)𝑦 ≤ (𝐹‘𝑙) ↔ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)𝑥 ≤ (𝐹‘𝑘))) |
22 | 21 | cbvralvw 3449 | . 2 ⊢ (∀𝑦 ∈ ℝ ∃𝑖 ∈ 𝑍 ∀𝑙 ∈ (ℤ≥‘𝑖)𝑦 ≤ (𝐹‘𝑙) ↔ ∀𝑥 ∈ ℝ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)𝑥 ≤ (𝐹‘𝑘)) |
23 | 4, 22 | syl6bb 289 | 1 ⊢ (𝜑 → (𝐹~~>*+∞ ↔ ∀𝑥 ∈ ℝ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)𝑥 ≤ (𝐹‘𝑘))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 = wceq 1533 ∈ wcel 2110 Ⅎwnfc 2961 ∀wral 3138 ∃wrex 3139 class class class wbr 5058 ⟶wf 6345 ‘cfv 6349 ℝcr 10530 +∞cpnf 10666 ℝ*cxr 10668 ≤ cle 10670 ℤcz 11975 ℤ≥cuz 12237 ~~>*clsxlim 42092 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5195 ax-nul 5202 ax-pow 5258 ax-pr 5321 ax-un 7455 ax-cnex 10587 ax-resscn 10588 ax-1cn 10589 ax-icn 10590 ax-addcl 10591 ax-addrcl 10592 ax-mulcl 10593 ax-mulrcl 10594 ax-mulcom 10595 ax-addass 10596 ax-mulass 10597 ax-distr 10598 ax-i2m1 10599 ax-1ne0 10600 ax-1rid 10601 ax-rnegex 10602 ax-rrecex 10603 ax-cnre 10604 ax-pre-lttri 10605 ax-pre-lttrn 10606 ax-pre-ltadd 10607 ax-pre-mulgt0 10608 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-sbc 3772 df-csb 3883 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-pss 3953 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4561 df-pr 4563 df-tp 4565 df-op 4567 df-uni 4832 df-int 4869 df-iun 4913 df-br 5059 df-opab 5121 df-mpt 5139 df-tr 5165 df-id 5454 df-eprel 5459 df-po 5468 df-so 5469 df-fr 5508 df-we 5510 df-xp 5555 df-rel 5556 df-cnv 5557 df-co 5558 df-dm 5559 df-rn 5560 df-res 5561 df-ima 5562 df-pred 6142 df-ord 6188 df-on 6189 df-lim 6190 df-suc 6191 df-iota 6308 df-fun 6351 df-fn 6352 df-f 6353 df-f1 6354 df-fo 6355 df-f1o 6356 df-fv 6357 df-riota 7108 df-ov 7153 df-oprab 7154 df-mpo 7155 df-om 7575 df-1st 7683 df-2nd 7684 df-wrecs 7941 df-recs 8002 df-rdg 8040 df-1o 8096 df-oadd 8100 df-er 8283 df-pm 8403 df-en 8504 df-dom 8505 df-sdom 8506 df-fin 8507 df-fi 8869 df-pnf 10671 df-mnf 10672 df-xr 10673 df-ltxr 10674 df-le 10675 df-sub 10866 df-neg 10867 df-z 11976 df-uz 12238 df-ioo 12736 df-ioc 12737 df-ico 12738 df-icc 12739 df-topgen 16711 df-ordt 16768 df-ps 17804 df-tsr 17805 df-top 21496 df-topon 21513 df-bases 21548 df-lm 21831 df-xlim 42093 |
This theorem is referenced by: xlimpnfmpt 42118 dfxlim2v 42121 xlimpnfxnegmnf2 42132 meaiuninc3v 42760 |
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