Mathbox for Glauco Siliprandi |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > limsuppnfd | Structured version Visualization version GIF version |
Description: If the restriction of a function to every upper interval is unbounded above, its lim sup is +∞. (Contributed by Glauco Siliprandi, 23-Oct-2021.) |
Ref | Expression |
---|---|
limsuppnfd.j | ⊢ Ⅎ𝑗𝐹 |
limsuppnfd.a | ⊢ (𝜑 → 𝐴 ⊆ ℝ) |
limsuppnfd.f | ⊢ (𝜑 → 𝐹:𝐴⟶ℝ*) |
limsuppnfd.u | ⊢ (𝜑 → ∀𝑥 ∈ ℝ ∀𝑘 ∈ ℝ ∃𝑗 ∈ 𝐴 (𝑘 ≤ 𝑗 ∧ 𝑥 ≤ (𝐹‘𝑗))) |
Ref | Expression |
---|---|
limsuppnfd | ⊢ (𝜑 → (lim sup‘𝐹) = +∞) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | limsuppnfd.a | . 2 ⊢ (𝜑 → 𝐴 ⊆ ℝ) | |
2 | limsuppnfd.f | . 2 ⊢ (𝜑 → 𝐹:𝐴⟶ℝ*) | |
3 | limsuppnfd.u | . . 3 ⊢ (𝜑 → ∀𝑥 ∈ ℝ ∀𝑘 ∈ ℝ ∃𝑗 ∈ 𝐴 (𝑘 ≤ 𝑗 ∧ 𝑥 ≤ (𝐹‘𝑗))) | |
4 | breq1 5061 | . . . . . 6 ⊢ (𝑥 = 𝑦 → (𝑥 ≤ (𝐹‘𝑗) ↔ 𝑦 ≤ (𝐹‘𝑗))) | |
5 | 4 | anbi2d 630 | . . . . 5 ⊢ (𝑥 = 𝑦 → ((𝑘 ≤ 𝑗 ∧ 𝑥 ≤ (𝐹‘𝑗)) ↔ (𝑘 ≤ 𝑗 ∧ 𝑦 ≤ (𝐹‘𝑗)))) |
6 | 5 | rexbidv 3297 | . . . 4 ⊢ (𝑥 = 𝑦 → (∃𝑗 ∈ 𝐴 (𝑘 ≤ 𝑗 ∧ 𝑥 ≤ (𝐹‘𝑗)) ↔ ∃𝑗 ∈ 𝐴 (𝑘 ≤ 𝑗 ∧ 𝑦 ≤ (𝐹‘𝑗)))) |
7 | breq1 5061 | . . . . . . 7 ⊢ (𝑘 = 𝑖 → (𝑘 ≤ 𝑗 ↔ 𝑖 ≤ 𝑗)) | |
8 | 7 | anbi1d 631 | . . . . . 6 ⊢ (𝑘 = 𝑖 → ((𝑘 ≤ 𝑗 ∧ 𝑦 ≤ (𝐹‘𝑗)) ↔ (𝑖 ≤ 𝑗 ∧ 𝑦 ≤ (𝐹‘𝑗)))) |
9 | 8 | rexbidv 3297 | . . . . 5 ⊢ (𝑘 = 𝑖 → (∃𝑗 ∈ 𝐴 (𝑘 ≤ 𝑗 ∧ 𝑦 ≤ (𝐹‘𝑗)) ↔ ∃𝑗 ∈ 𝐴 (𝑖 ≤ 𝑗 ∧ 𝑦 ≤ (𝐹‘𝑗)))) |
10 | nfv 1911 | . . . . . . 7 ⊢ Ⅎ𝑙(𝑖 ≤ 𝑗 ∧ 𝑦 ≤ (𝐹‘𝑗)) | |
11 | nfv 1911 | . . . . . . . 8 ⊢ Ⅎ𝑗 𝑖 ≤ 𝑙 | |
12 | nfcv 2977 | . . . . . . . . 9 ⊢ Ⅎ𝑗𝑦 | |
13 | nfcv 2977 | . . . . . . . . 9 ⊢ Ⅎ𝑗 ≤ | |
14 | limsuppnfd.j | . . . . . . . . . 10 ⊢ Ⅎ𝑗𝐹 | |
15 | nfcv 2977 | . . . . . . . . . 10 ⊢ Ⅎ𝑗𝑙 | |
16 | 14, 15 | nffv 6674 | . . . . . . . . 9 ⊢ Ⅎ𝑗(𝐹‘𝑙) |
17 | 12, 13, 16 | nfbr 5105 | . . . . . . . 8 ⊢ Ⅎ𝑗 𝑦 ≤ (𝐹‘𝑙) |
18 | 11, 17 | nfan 1896 | . . . . . . 7 ⊢ Ⅎ𝑗(𝑖 ≤ 𝑙 ∧ 𝑦 ≤ (𝐹‘𝑙)) |
19 | breq2 5062 | . . . . . . . 8 ⊢ (𝑗 = 𝑙 → (𝑖 ≤ 𝑗 ↔ 𝑖 ≤ 𝑙)) | |
20 | fveq2 6664 | . . . . . . . . 9 ⊢ (𝑗 = 𝑙 → (𝐹‘𝑗) = (𝐹‘𝑙)) | |
21 | 20 | breq2d 5070 | . . . . . . . 8 ⊢ (𝑗 = 𝑙 → (𝑦 ≤ (𝐹‘𝑗) ↔ 𝑦 ≤ (𝐹‘𝑙))) |
22 | 19, 21 | anbi12d 632 | . . . . . . 7 ⊢ (𝑗 = 𝑙 → ((𝑖 ≤ 𝑗 ∧ 𝑦 ≤ (𝐹‘𝑗)) ↔ (𝑖 ≤ 𝑙 ∧ 𝑦 ≤ (𝐹‘𝑙)))) |
23 | 10, 18, 22 | cbvrexw 3442 | . . . . . 6 ⊢ (∃𝑗 ∈ 𝐴 (𝑖 ≤ 𝑗 ∧ 𝑦 ≤ (𝐹‘𝑗)) ↔ ∃𝑙 ∈ 𝐴 (𝑖 ≤ 𝑙 ∧ 𝑦 ≤ (𝐹‘𝑙))) |
24 | 23 | a1i 11 | . . . . 5 ⊢ (𝑘 = 𝑖 → (∃𝑗 ∈ 𝐴 (𝑖 ≤ 𝑗 ∧ 𝑦 ≤ (𝐹‘𝑗)) ↔ ∃𝑙 ∈ 𝐴 (𝑖 ≤ 𝑙 ∧ 𝑦 ≤ (𝐹‘𝑙)))) |
25 | 9, 24 | bitrd 281 | . . . 4 ⊢ (𝑘 = 𝑖 → (∃𝑗 ∈ 𝐴 (𝑘 ≤ 𝑗 ∧ 𝑦 ≤ (𝐹‘𝑗)) ↔ ∃𝑙 ∈ 𝐴 (𝑖 ≤ 𝑙 ∧ 𝑦 ≤ (𝐹‘𝑙)))) |
26 | 6, 25 | cbvral2vw 3461 | . . 3 ⊢ (∀𝑥 ∈ ℝ ∀𝑘 ∈ ℝ ∃𝑗 ∈ 𝐴 (𝑘 ≤ 𝑗 ∧ 𝑥 ≤ (𝐹‘𝑗)) ↔ ∀𝑦 ∈ ℝ ∀𝑖 ∈ ℝ ∃𝑙 ∈ 𝐴 (𝑖 ≤ 𝑙 ∧ 𝑦 ≤ (𝐹‘𝑙))) |
27 | 3, 26 | sylib 220 | . 2 ⊢ (𝜑 → ∀𝑦 ∈ ℝ ∀𝑖 ∈ ℝ ∃𝑙 ∈ 𝐴 (𝑖 ≤ 𝑙 ∧ 𝑦 ≤ (𝐹‘𝑙))) |
28 | eqid 2821 | . 2 ⊢ (𝑖 ∈ ℝ ↦ sup(((𝐹 “ (𝑖[,)+∞)) ∩ ℝ*), ℝ*, < )) = (𝑖 ∈ ℝ ↦ sup(((𝐹 “ (𝑖[,)+∞)) ∩ ℝ*), ℝ*, < )) | |
29 | 1, 2, 27, 28 | limsuppnfdlem 41975 | 1 ⊢ (𝜑 → (lim sup‘𝐹) = +∞) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 = wceq 1533 Ⅎwnfc 2961 ∀wral 3138 ∃wrex 3139 ∩ cin 3934 ⊆ wss 3935 class class class wbr 5058 ↦ cmpt 5138 “ cima 5552 ⟶wf 6345 ‘cfv 6349 (class class class)co 7150 supcsup 8898 ℝcr 10530 +∞cpnf 10666 ℝ*cxr 10668 < clt 10669 ≤ cle 10670 [,)cico 12734 lim supclsp 14821 |
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-rep 5182 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 ax-pre-sup 10609 |
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-rmo 3146 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-nul 4291 df-if 4467 df-pw 4540 df-sn 4561 df-pr 4563 df-op 4567 df-uni 4832 df-iun 4913 df-br 5059 df-opab 5121 df-mpt 5139 df-id 5454 df-po 5468 df-so 5469 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-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-er 8283 df-en 8504 df-dom 8505 df-sdom 8506 df-sup 8900 df-inf 8901 df-pnf 10671 df-mnf 10672 df-xr 10673 df-ltxr 10674 df-le 10675 df-sub 10866 df-neg 10867 df-ico 12738 df-limsup 14822 |
This theorem is referenced by: limsupub 41978 limsuppnflem 41984 |
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