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| Mirrors > Home > MPE Home > Th. List > Mathboxes > xlimmnflimsup2 | Structured version Visualization version GIF version | ||
| Description: A sequence of extended reals converges to -∞ if and only if its superior limit is also -∞. (Contributed by Glauco Siliprandi, 23-Apr-2023.) |
| Ref | Expression |
|---|---|
| xlimmnflimsup2.m | ⊢ (𝜑 → 𝑀 ∈ ℤ) |
| xlimmnflimsup2.z | ⊢ 𝑍 = (ℤ≥‘𝑀) |
| xlimmnflimsup2.f | ⊢ (𝜑 → 𝐹:𝑍⟶ℝ*) |
| Ref | Expression |
|---|---|
| xlimmnflimsup2 | ⊢ (𝜑 → (𝐹~~>*-∞ ↔ (lim sup‘𝐹) = -∞)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | xlimmnflimsup2.m | . . 3 ⊢ (𝜑 → 𝑀 ∈ ℤ) | |
| 2 | xlimmnflimsup2.z | . . 3 ⊢ 𝑍 = (ℤ≥‘𝑀) | |
| 3 | xlimmnflimsup2.f | . . 3 ⊢ (𝜑 → 𝐹:𝑍⟶ℝ*) | |
| 4 | 1, 2, 3 | xlimmnfv 46250 | . 2 ⊢ (𝜑 → (𝐹~~>*-∞ ↔ ∀𝑥 ∈ ℝ ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥)) |
| 5 | nfcv 2897 | . . 3 ⊢ Ⅎ𝑗𝐹 | |
| 6 | 5, 1, 2, 3 | limsupmnfuz 46143 | . 2 ⊢ (𝜑 → ((lim sup‘𝐹) = -∞ ↔ ∀𝑥 ∈ ℝ ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥)) |
| 7 | 4, 6 | bitr4d 282 | 1 ⊢ (𝜑 → (𝐹~~>*-∞ ↔ (lim sup‘𝐹) = -∞)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 = wceq 1542 ∈ wcel 2114 ∀wral 3049 ∃wrex 3059 class class class wbr 5074 ⟶wf 6483 ‘cfv 6487 ℝcr 11026 -∞cmnf 11166 ℝ*cxr 11167 ≤ cle 11169 ℤcz 12513 ℤ≥cuz 12777 lim supclsp 15421 ~~>*clsxlim 46234 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2184 ax-ext 2707 ax-rep 5201 ax-sep 5220 ax-nul 5230 ax-pow 5296 ax-pr 5364 ax-un 7678 ax-cnex 11083 ax-resscn 11084 ax-1cn 11085 ax-icn 11086 ax-addcl 11087 ax-addrcl 11088 ax-mulcl 11089 ax-mulrcl 11090 ax-mulcom 11091 ax-addass 11092 ax-mulass 11093 ax-distr 11094 ax-i2m1 11095 ax-1ne0 11096 ax-1rid 11097 ax-rnegex 11098 ax-rrecex 11099 ax-cnre 11100 ax-pre-lttri 11101 ax-pre-lttrn 11102 ax-pre-ltadd 11103 ax-pre-mulgt0 11104 ax-pre-sup 11105 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2538 df-eu 2568 df-clab 2714 df-cleq 2727 df-clel 2810 df-nfc 2884 df-ne 2931 df-nel 3035 df-ral 3050 df-rex 3060 df-rmo 3340 df-reu 3341 df-rab 3388 df-v 3429 df-sbc 3726 df-csb 3834 df-dif 3888 df-un 3890 df-in 3892 df-ss 3902 df-pss 3905 df-nul 4264 df-if 4457 df-pw 4533 df-sn 4558 df-pr 4560 df-op 4564 df-uni 4841 df-int 4880 df-iun 4925 df-br 5075 df-opab 5137 df-mpt 5156 df-tr 5182 df-id 5515 df-eprel 5520 df-po 5528 df-so 5529 df-fr 5573 df-we 5575 df-xp 5626 df-rel 5627 df-cnv 5628 df-co 5629 df-dm 5630 df-rn 5631 df-res 5632 df-ima 5633 df-pred 6254 df-ord 6315 df-on 6316 df-lim 6317 df-suc 6318 df-iota 6443 df-fun 6489 df-fn 6490 df-f 6491 df-f1 6492 df-fo 6493 df-f1o 6494 df-fv 6495 df-riota 7313 df-ov 7359 df-oprab 7360 df-mpo 7361 df-om 7807 df-1st 7931 df-2nd 7932 df-frecs 8220 df-wrecs 8251 df-recs 8300 df-rdg 8338 df-1o 8394 df-2o 8395 df-er 8632 df-pm 8765 df-en 8883 df-dom 8884 df-sdom 8885 df-fin 8886 df-fi 9313 df-sup 9344 df-inf 9345 df-pnf 11170 df-mnf 11171 df-xr 11172 df-ltxr 11173 df-le 11174 df-sub 11368 df-neg 11369 df-nn 12164 df-n0 12427 df-z 12514 df-uz 12778 df-ioo 13291 df-ioc 13292 df-ico 13293 df-icc 13294 df-fl 13740 df-ceil 13741 df-limsup 15422 df-topgen 17395 df-ordt 17454 df-ps 18521 df-tsr 18522 df-top 22847 df-topon 22864 df-bases 22899 df-lm 23182 df-xlim 46235 |
| This theorem is referenced by: xlimliminflimsup 46278 |
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