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| Mirrors > Home > MPE Home > Th. List > logno1 | Structured version Visualization version GIF version | ||
| Description: The logarithm function is not eventually bounded. (Contributed by Mario Carneiro, 30-Apr-2016.) (Proof shortened by Mario Carneiro, 30-May-2016.) |
| Ref | Expression |
|---|---|
| logno1 | ⊢ ¬ (𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elioore 13275 | . . . . . . 7 ⊢ (𝑦 ∈ (1(,)+∞) → 𝑦 ∈ ℝ) | |
| 2 | 1 | adantl 481 | . . . . . 6 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → 𝑦 ∈ ℝ) |
| 3 | 1rp 12894 | . . . . . . 7 ⊢ 1 ∈ ℝ+ | |
| 4 | 3 | a1i 11 | . . . . . 6 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → 1 ∈ ℝ+) |
| 5 | 1red 11113 | . . . . . . 7 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → 1 ∈ ℝ) | |
| 6 | eliooord 13305 | . . . . . . . . 9 ⊢ (𝑦 ∈ (1(,)+∞) → (1 < 𝑦 ∧ 𝑦 < +∞)) | |
| 7 | 6 | adantl 481 | . . . . . . . 8 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → (1 < 𝑦 ∧ 𝑦 < +∞)) |
| 8 | 7 | simpld 494 | . . . . . . 7 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → 1 < 𝑦) |
| 9 | 5, 2, 8 | ltled 11261 | . . . . . 6 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → 1 ≤ 𝑦) |
| 10 | 2, 4, 9 | rpgecld 12973 | . . . . 5 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → 𝑦 ∈ ℝ+) |
| 11 | 10 | ex 412 | . . . 4 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) → (𝑦 ∈ (1(,)+∞) → 𝑦 ∈ ℝ+)) |
| 12 | 11 | ssrdv 3940 | . . 3 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) → (1(,)+∞) ⊆ ℝ+) |
| 13 | fveq2 6822 | . . . . . 6 ⊢ (𝑥 = 𝑦 → (log‘𝑥) = (log‘𝑦)) | |
| 14 | 13 | cbvmptv 5195 | . . . . 5 ⊢ (𝑥 ∈ ℝ+ ↦ (log‘𝑥)) = (𝑦 ∈ ℝ+ ↦ (log‘𝑦)) |
| 15 | 14 | eleq1i 2822 | . . . 4 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ↔ (𝑦 ∈ ℝ+ ↦ (log‘𝑦)) ∈ 𝑂(1)) |
| 16 | 15 | biimpi 216 | . . 3 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) → (𝑦 ∈ ℝ+ ↦ (log‘𝑦)) ∈ 𝑂(1)) |
| 17 | 12, 16 | o1res2 15470 | . 2 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) → (𝑦 ∈ (1(,)+∞) ↦ (log‘𝑦)) ∈ 𝑂(1)) |
| 18 | 1red 11113 | . . . . 5 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) → 1 ∈ ℝ) | |
| 19 | 18 | rexrd 11162 | . . . 4 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) → 1 ∈ ℝ*) |
| 20 | 18 | renepnfd 11163 | . . . 4 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) → 1 ≠ +∞) |
| 21 | ioopnfsup 13768 | . . . 4 ⊢ ((1 ∈ ℝ* ∧ 1 ≠ +∞) → sup((1(,)+∞), ℝ*, < ) = +∞) | |
| 22 | 19, 20, 21 | syl2anc 584 | . . 3 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) → sup((1(,)+∞), ℝ*, < ) = +∞) |
| 23 | divlogrlim 26572 | . . . 4 ⊢ (𝑦 ∈ (1(,)+∞) ↦ (1 / (log‘𝑦))) ⇝𝑟 0 | |
| 24 | 23 | a1i 11 | . . 3 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) → (𝑦 ∈ (1(,)+∞) ↦ (1 / (log‘𝑦))) ⇝𝑟 0) |
| 25 | 2, 8 | rplogcld 26566 | . . . 4 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → (log‘𝑦) ∈ ℝ+) |
| 26 | 25 | rpcnd 12936 | . . 3 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → (log‘𝑦) ∈ ℂ) |
| 27 | 25 | rpne0d 12939 | . . 3 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → (log‘𝑦) ≠ 0) |
| 28 | 22, 24, 26, 27 | rlimno1 15561 | . 2 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) → ¬ (𝑦 ∈ (1(,)+∞) ↦ (log‘𝑦)) ∈ 𝑂(1)) |
| 29 | 17, 28 | pm2.65i 194 | 1 ⊢ ¬ (𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ∧ wa 395 = wceq 1541 ∈ wcel 2111 ≠ wne 2928 class class class wbr 5091 ↦ cmpt 5172 ‘cfv 6481 (class class class)co 7346 supcsup 9324 ℝcr 11005 0cc0 11006 1c1 11007 +∞cpnf 11143 ℝ*cxr 11145 < clt 11146 / cdiv 11774 ℝ+crp 12890 (,)cioo 13245 ⇝𝑟 crli 15392 𝑂(1)co1 15393 logclog 26491 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-rep 5217 ax-sep 5234 ax-nul 5244 ax-pow 5303 ax-pr 5370 ax-un 7668 ax-inf2 9531 ax-cnex 11062 ax-resscn 11063 ax-1cn 11064 ax-icn 11065 ax-addcl 11066 ax-addrcl 11067 ax-mulcl 11068 ax-mulrcl 11069 ax-mulcom 11070 ax-addass 11071 ax-mulass 11072 ax-distr 11073 ax-i2m1 11074 ax-1ne0 11075 ax-1rid 11076 ax-rnegex 11077 ax-rrecex 11078 ax-cnre 11079 ax-pre-lttri 11080 ax-pre-lttrn 11081 ax-pre-ltadd 11082 ax-pre-mulgt0 11083 ax-pre-sup 11084 ax-addf 11085 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-rmo 3346 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3742 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4284 df-if 4476 df-pw 4552 df-sn 4577 df-pr 4579 df-tp 4581 df-op 4583 df-uni 4860 df-int 4898 df-iun 4943 df-iin 4944 df-br 5092 df-opab 5154 df-mpt 5173 df-tr 5199 df-id 5511 df-eprel 5516 df-po 5524 df-so 5525 df-fr 5569 df-se 5570 df-we 5571 df-xp 5622 df-rel 5623 df-cnv 5624 df-co 5625 df-dm 5626 df-rn 5627 df-res 5628 df-ima 5629 df-pred 6248 df-ord 6309 df-on 6310 df-lim 6311 df-suc 6312 df-iota 6437 df-fun 6483 df-fn 6484 df-f 6485 df-f1 6486 df-fo 6487 df-f1o 6488 df-fv 6489 df-isom 6490 df-riota 7303 df-ov 7349 df-oprab 7350 df-mpo 7351 df-of 7610 df-om 7797 df-1st 7921 df-2nd 7922 df-supp 8091 df-frecs 8211 df-wrecs 8242 df-recs 8291 df-rdg 8329 df-1o 8385 df-2o 8386 df-er 8622 df-map 8752 df-pm 8753 df-ixp 8822 df-en 8870 df-dom 8871 df-sdom 8872 df-fin 8873 df-fsupp 9246 df-fi 9295 df-sup 9326 df-inf 9327 df-oi 9396 df-card 9832 df-pnf 11148 df-mnf 11149 df-xr 11150 df-ltxr 11151 df-le 11152 df-sub 11346 df-neg 11347 df-div 11775 df-nn 12126 df-2 12188 df-3 12189 df-4 12190 df-5 12191 df-6 12192 df-7 12193 df-8 12194 df-9 12195 df-n0 12382 df-z 12469 df-dec 12589 df-uz 12733 df-q 12847 df-rp 12891 df-xneg 13011 df-xadd 13012 df-xmul 13013 df-ioo 13249 df-ioc 13250 df-ico 13251 df-icc 13252 df-fz 13408 df-fzo 13555 df-fl 13696 df-mod 13774 df-seq 13909 df-exp 13969 df-fac 14181 df-bc 14210 df-hash 14238 df-shft 14974 df-cj 15006 df-re 15007 df-im 15008 df-sqrt 15142 df-abs 15143 df-limsup 15378 df-clim 15395 df-rlim 15396 df-o1 15397 df-lo1 15398 df-sum 15594 df-ef 15974 df-sin 15976 df-cos 15977 df-pi 15979 df-struct 17058 df-sets 17075 df-slot 17093 df-ndx 17105 df-base 17121 df-ress 17142 df-plusg 17174 df-mulr 17175 df-starv 17176 df-sca 17177 df-vsca 17178 df-ip 17179 df-tset 17180 df-ple 17181 df-ds 17183 df-unif 17184 df-hom 17185 df-cco 17186 df-rest 17326 df-topn 17327 df-0g 17345 df-gsum 17346 df-topgen 17347 df-pt 17348 df-prds 17351 df-xrs 17406 df-qtop 17411 df-imas 17412 df-xps 17414 df-mre 17488 df-mrc 17489 df-acs 17491 df-mgm 18548 df-sgrp 18627 df-mnd 18643 df-submnd 18692 df-mulg 18981 df-cntz 19230 df-cmn 19695 df-psmet 21284 df-xmet 21285 df-met 21286 df-bl 21287 df-mopn 21288 df-fbas 21289 df-fg 21290 df-cnfld 21293 df-top 22810 df-topon 22827 df-topsp 22849 df-bases 22862 df-cld 22935 df-ntr 22936 df-cls 22937 df-nei 23014 df-lp 23052 df-perf 23053 df-cn 23143 df-cnp 23144 df-haus 23231 df-tx 23478 df-hmeo 23671 df-fil 23762 df-fm 23854 df-flim 23855 df-flf 23856 df-xms 24236 df-ms 24237 df-tms 24238 df-cncf 24799 df-limc 25795 df-dv 25796 df-log 26493 |
| This theorem is referenced by: dchrisum0fno1 27450 dchrisum0re 27452 dirith2 27467 |
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