| Mathbox for Glauco Siliprandi |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > limsup0 | Structured version Visualization version GIF version | ||
| Description: The superior limit of the empty set. (Contributed by Glauco Siliprandi, 23-Oct-2021.) |
| Ref | Expression |
|---|---|
| limsup0 | ⊢ (lim sup‘∅) = -∞ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0ex 5254 | . . 3 ⊢ ∅ ∈ V | |
| 2 | eqid 2737 | . . . 4 ⊢ (𝑥 ∈ ℝ ↦ sup(((∅ “ (𝑥[,)+∞)) ∩ ℝ*), ℝ*, < )) = (𝑥 ∈ ℝ ↦ sup(((∅ “ (𝑥[,)+∞)) ∩ ℝ*), ℝ*, < )) | |
| 3 | 2 | limsupval 15409 | . . 3 ⊢ (∅ ∈ V → (lim sup‘∅) = inf(ran (𝑥 ∈ ℝ ↦ sup(((∅ “ (𝑥[,)+∞)) ∩ ℝ*), ℝ*, < )), ℝ*, < )) |
| 4 | 1, 3 | ax-mp 5 | . 2 ⊢ (lim sup‘∅) = inf(ran (𝑥 ∈ ℝ ↦ sup(((∅ “ (𝑥[,)+∞)) ∩ ℝ*), ℝ*, < )), ℝ*, < ) |
| 5 | 0ima 6045 | . . . . . . . . . 10 ⊢ (∅ “ (𝑥[,)+∞)) = ∅ | |
| 6 | 5 | ineq1i 4170 | . . . . . . . . 9 ⊢ ((∅ “ (𝑥[,)+∞)) ∩ ℝ*) = (∅ ∩ ℝ*) |
| 7 | 0in 4351 | . . . . . . . . 9 ⊢ (∅ ∩ ℝ*) = ∅ | |
| 8 | 6, 7 | eqtri 2760 | . . . . . . . 8 ⊢ ((∅ “ (𝑥[,)+∞)) ∩ ℝ*) = ∅ |
| 9 | 8 | supeq1i 9362 | . . . . . . 7 ⊢ sup(((∅ “ (𝑥[,)+∞)) ∩ ℝ*), ℝ*, < ) = sup(∅, ℝ*, < ) |
| 10 | xrsup0 13250 | . . . . . . 7 ⊢ sup(∅, ℝ*, < ) = -∞ | |
| 11 | 9, 10 | eqtri 2760 | . . . . . 6 ⊢ sup(((∅ “ (𝑥[,)+∞)) ∩ ℝ*), ℝ*, < ) = -∞ |
| 12 | 11 | mpteq2i 5196 | . . . . 5 ⊢ (𝑥 ∈ ℝ ↦ sup(((∅ “ (𝑥[,)+∞)) ∩ ℝ*), ℝ*, < )) = (𝑥 ∈ ℝ ↦ -∞) |
| 13 | ren0 45757 | . . . . . 6 ⊢ ℝ ≠ ∅ | |
| 14 | 13 | a1i 11 | . . . . 5 ⊢ (⊤ → ℝ ≠ ∅) |
| 15 | 12, 14 | rnmptc 7163 | . . . 4 ⊢ (⊤ → ran (𝑥 ∈ ℝ ↦ sup(((∅ “ (𝑥[,)+∞)) ∩ ℝ*), ℝ*, < )) = {-∞}) |
| 16 | 15 | mptru 1549 | . . 3 ⊢ ran (𝑥 ∈ ℝ ↦ sup(((∅ “ (𝑥[,)+∞)) ∩ ℝ*), ℝ*, < )) = {-∞} |
| 17 | 16 | infeq1i 9394 | . 2 ⊢ inf(ran (𝑥 ∈ ℝ ↦ sup(((∅ “ (𝑥[,)+∞)) ∩ ℝ*), ℝ*, < )), ℝ*, < ) = inf({-∞}, ℝ*, < ) |
| 18 | xrltso 13067 | . . 3 ⊢ < Or ℝ* | |
| 19 | mnfxr 11201 | . . 3 ⊢ -∞ ∈ ℝ* | |
| 20 | infsn 9422 | . . 3 ⊢ (( < Or ℝ* ∧ -∞ ∈ ℝ*) → inf({-∞}, ℝ*, < ) = -∞) | |
| 21 | 18, 19, 20 | mp2an 693 | . 2 ⊢ inf({-∞}, ℝ*, < ) = -∞ |
| 22 | 4, 17, 21 | 3eqtri 2764 | 1 ⊢ (lim sup‘∅) = -∞ |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1542 ⊤wtru 1543 ∈ wcel 2114 ≠ wne 2933 Vcvv 3442 ∩ cin 3902 ∅c0 4287 {csn 4582 ↦ cmpt 5181 Or wor 5539 ran crn 5633 “ cima 5635 ‘cfv 6500 (class class class)co 7368 supcsup 9355 infcinf 9356 ℝcr 11037 +∞cpnf 11175 -∞cmnf 11176 ℝ*cxr 11177 < clt 11178 [,)cico 13275 lim supclsp 15405 |
| 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 2185 ax-ext 2709 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115 |
| 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 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rmo 3352 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-br 5101 df-opab 5163 df-mpt 5182 df-id 5527 df-po 5540 df-so 5541 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-riota 7325 df-ov 7371 df-oprab 7372 df-mpo 7373 df-er 8645 df-en 8896 df-dom 8897 df-sdom 8898 df-sup 9357 df-inf 9358 df-pnf 11180 df-mnf 11181 df-xr 11182 df-ltxr 11183 df-le 11184 df-sub 11378 df-neg 11379 df-limsup 15406 |
| This theorem is referenced by: climlimsupcex 46124 liminf0 46148 liminflelimsupcex 46152 |
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