Mathbox for Glauco Siliprandi |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > xlimpnfmpt | 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 |
---|---|
xlimpnfmpt.k | ⊢ Ⅎ𝑘𝜑 |
xlimpnfmpt.m | ⊢ (𝜑 → 𝑀 ∈ ℤ) |
xlimpnfmpt.z | ⊢ 𝑍 = (ℤ≥‘𝑀) |
xlimpnfmpt.b | ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → 𝐵 ∈ ℝ*) |
xlimpnfmpt.f | ⊢ 𝐹 = (𝑘 ∈ 𝑍 ↦ 𝐵) |
Ref | Expression |
---|---|
xlimpnfmpt | ⊢ (𝜑 → (𝐹~~>*+∞ ↔ ∀𝑥 ∈ ℝ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)𝑥 ≤ 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | xlimpnfmpt.f | . . . 4 ⊢ 𝐹 = (𝑘 ∈ 𝑍 ↦ 𝐵) | |
2 | nfmpt1 5187 | . . . 4 ⊢ Ⅎ𝑘(𝑘 ∈ 𝑍 ↦ 𝐵) | |
3 | 1, 2 | nfcxfr 2907 | . . 3 ⊢ Ⅎ𝑘𝐹 |
4 | xlimpnfmpt.m | . . 3 ⊢ (𝜑 → 𝑀 ∈ ℤ) | |
5 | xlimpnfmpt.z | . . 3 ⊢ 𝑍 = (ℤ≥‘𝑀) | |
6 | xlimpnfmpt.k | . . . 4 ⊢ Ⅎ𝑘𝜑 | |
7 | xlimpnfmpt.b | . . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → 𝐵 ∈ ℝ*) | |
8 | 6, 7, 1 | fmptdf 6988 | . . 3 ⊢ (𝜑 → 𝐹:𝑍⟶ℝ*) |
9 | 3, 4, 5, 8 | xlimpnf 43354 | . 2 ⊢ (𝜑 → (𝐹~~>*+∞ ↔ ∀𝑦 ∈ ℝ ∃𝑖 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑖)𝑦 ≤ (𝐹‘𝑘))) |
10 | nfv 1921 | . . . . . 6 ⊢ Ⅎ𝑘 𝑖 ∈ 𝑍 | |
11 | 6, 10 | nfan 1906 | . . . . 5 ⊢ Ⅎ𝑘(𝜑 ∧ 𝑖 ∈ 𝑍) |
12 | 5 | uztrn2 12600 | . . . . . . . 8 ⊢ ((𝑖 ∈ 𝑍 ∧ 𝑘 ∈ (ℤ≥‘𝑖)) → 𝑘 ∈ 𝑍) |
13 | 12 | adantll 711 | . . . . . . 7 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ 𝑘 ∈ (ℤ≥‘𝑖)) → 𝑘 ∈ 𝑍) |
14 | simpll 764 | . . . . . . . 8 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ 𝑘 ∈ (ℤ≥‘𝑖)) → 𝜑) | |
15 | 14, 13, 7 | syl2anc 584 | . . . . . . 7 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ 𝑘 ∈ (ℤ≥‘𝑖)) → 𝐵 ∈ ℝ*) |
16 | 1 | fvmpt2 6883 | . . . . . . 7 ⊢ ((𝑘 ∈ 𝑍 ∧ 𝐵 ∈ ℝ*) → (𝐹‘𝑘) = 𝐵) |
17 | 13, 15, 16 | syl2anc 584 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ 𝑘 ∈ (ℤ≥‘𝑖)) → (𝐹‘𝑘) = 𝐵) |
18 | 17 | breq2d 5091 | . . . . 5 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑍) ∧ 𝑘 ∈ (ℤ≥‘𝑖)) → (𝑦 ≤ (𝐹‘𝑘) ↔ 𝑦 ≤ 𝐵)) |
19 | 11, 18 | ralbida 3159 | . . . 4 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑍) → (∀𝑘 ∈ (ℤ≥‘𝑖)𝑦 ≤ (𝐹‘𝑘) ↔ ∀𝑘 ∈ (ℤ≥‘𝑖)𝑦 ≤ 𝐵)) |
20 | 19 | rexbidva 3227 | . . 3 ⊢ (𝜑 → (∃𝑖 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑖)𝑦 ≤ (𝐹‘𝑘) ↔ ∃𝑖 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑖)𝑦 ≤ 𝐵)) |
21 | 20 | ralbidv 3123 | . 2 ⊢ (𝜑 → (∀𝑦 ∈ ℝ ∃𝑖 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑖)𝑦 ≤ (𝐹‘𝑘) ↔ ∀𝑦 ∈ ℝ ∃𝑖 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑖)𝑦 ≤ 𝐵)) |
22 | breq1 5082 | . . . . . 6 ⊢ (𝑦 = 𝑥 → (𝑦 ≤ 𝐵 ↔ 𝑥 ≤ 𝐵)) | |
23 | 22 | rexralbidv 3232 | . . . . 5 ⊢ (𝑦 = 𝑥 → (∃𝑖 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑖)𝑦 ≤ 𝐵 ↔ ∃𝑖 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑖)𝑥 ≤ 𝐵)) |
24 | fveq2 6771 | . . . . . . 7 ⊢ (𝑖 = 𝑗 → (ℤ≥‘𝑖) = (ℤ≥‘𝑗)) | |
25 | 24 | raleqdv 3347 | . . . . . 6 ⊢ (𝑖 = 𝑗 → (∀𝑘 ∈ (ℤ≥‘𝑖)𝑥 ≤ 𝐵 ↔ ∀𝑘 ∈ (ℤ≥‘𝑗)𝑥 ≤ 𝐵)) |
26 | 25 | cbvrexvw 3382 | . . . . 5 ⊢ (∃𝑖 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑖)𝑥 ≤ 𝐵 ↔ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)𝑥 ≤ 𝐵) |
27 | 23, 26 | bitrdi 287 | . . . 4 ⊢ (𝑦 = 𝑥 → (∃𝑖 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑖)𝑦 ≤ 𝐵 ↔ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)𝑥 ≤ 𝐵)) |
28 | 27 | cbvralvw 3381 | . . 3 ⊢ (∀𝑦 ∈ ℝ ∃𝑖 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑖)𝑦 ≤ 𝐵 ↔ ∀𝑥 ∈ ℝ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)𝑥 ≤ 𝐵) |
29 | 28 | a1i 11 | . 2 ⊢ (𝜑 → (∀𝑦 ∈ ℝ ∃𝑖 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑖)𝑦 ≤ 𝐵 ↔ ∀𝑥 ∈ ℝ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)𝑥 ≤ 𝐵)) |
30 | 9, 21, 29 | 3bitrd 305 | 1 ⊢ (𝜑 → (𝐹~~>*+∞ ↔ ∀𝑥 ∈ ℝ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)𝑥 ≤ 𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 = wceq 1542 Ⅎwnf 1790 ∈ wcel 2110 ∀wral 3066 ∃wrex 3067 class class class wbr 5079 ↦ cmpt 5162 ‘cfv 6432 ℝcr 10871 +∞cpnf 11007 ℝ*cxr 11009 ≤ cle 11011 ℤcz 12319 ℤ≥cuz 12581 ~~>*clsxlim 43330 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1975 ax-7 2015 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2158 ax-12 2175 ax-ext 2711 ax-sep 5227 ax-nul 5234 ax-pow 5292 ax-pr 5356 ax-un 7582 ax-cnex 10928 ax-resscn 10929 ax-1cn 10930 ax-icn 10931 ax-addcl 10932 ax-addrcl 10933 ax-mulcl 10934 ax-mulrcl 10935 ax-mulcom 10936 ax-addass 10937 ax-mulass 10938 ax-distr 10939 ax-i2m1 10940 ax-1ne0 10941 ax-1rid 10942 ax-rnegex 10943 ax-rrecex 10944 ax-cnre 10945 ax-pre-lttri 10946 ax-pre-lttrn 10947 ax-pre-ltadd 10948 ax-pre-mulgt0 10949 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1545 df-fal 1555 df-ex 1787 df-nf 1791 df-sb 2072 df-mo 2542 df-eu 2571 df-clab 2718 df-cleq 2732 df-clel 2818 df-nfc 2891 df-ne 2946 df-nel 3052 df-ral 3071 df-rex 3072 df-reu 3073 df-rab 3075 df-v 3433 df-sbc 3721 df-csb 3838 df-dif 3895 df-un 3897 df-in 3899 df-ss 3909 df-pss 3911 df-nul 4263 df-if 4466 df-pw 4541 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4846 df-int 4886 df-iun 4932 df-br 5080 df-opab 5142 df-mpt 5163 df-tr 5197 df-id 5490 df-eprel 5496 df-po 5504 df-so 5505 df-fr 5545 df-we 5547 df-xp 5596 df-rel 5597 df-cnv 5598 df-co 5599 df-dm 5600 df-rn 5601 df-res 5602 df-ima 5603 df-ord 6268 df-on 6269 df-lim 6270 df-suc 6271 df-iota 6390 df-fun 6434 df-fn 6435 df-f 6436 df-f1 6437 df-fo 6438 df-f1o 6439 df-fv 6440 df-riota 7228 df-ov 7274 df-oprab 7275 df-mpo 7276 df-om 7707 df-1st 7824 df-2nd 7825 df-1o 8288 df-er 8481 df-pm 8601 df-en 8717 df-dom 8718 df-sdom 8719 df-fin 8720 df-fi 9148 df-pnf 11012 df-mnf 11013 df-xr 11014 df-ltxr 11015 df-le 11016 df-sub 11207 df-neg 11208 df-z 12320 df-uz 12582 df-ioo 13082 df-ioc 13083 df-ico 13084 df-icc 13085 df-topgen 17152 df-ordt 17210 df-ps 18282 df-tsr 18283 df-top 22041 df-topon 22058 df-bases 22094 df-lm 22378 df-xlim 43331 |
This theorem is referenced by: (None) |
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