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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 13372 | . . . . . . 7 ⊢ (𝑦 ∈ (1(,)+∞) → 𝑦 ∈ ℝ) | |
| 2 | 1 | adantl 485 | . . . . . 6 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → 𝑦 ∈ ℝ) |
| 3 | 1rp 12990 | . . . . . . 7 ⊢ 1 ∈ ℝ+ | |
| 4 | 3 | a1i 11 | . . . . . 6 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → 1 ∈ ℝ+) |
| 5 | 1red 11175 | . . . . . . 7 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → 1 ∈ ℝ) | |
| 6 | eliooord 13402 | . . . . . . . . 9 ⊢ (𝑦 ∈ (1(,)+∞) → (1 < 𝑦 ∧ 𝑦 < +∞)) | |
| 7 | 6 | adantl 485 | . . . . . . . 8 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → (1 < 𝑦 ∧ 𝑦 < +∞)) |
| 8 | 7 | simpld 498 | . . . . . . 7 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → 1 < 𝑦) |
| 9 | 5, 2, 8 | ltled 11324 | . . . . . 6 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → 1 ≤ 𝑦) |
| 10 | 2, 4, 9 | rpgecld 13069 | . . . . 5 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → 𝑦 ∈ ℝ+) |
| 11 | 10 | ex 416 | . . . 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 6861 | . . . . . 6 ⊢ (𝑥 = 𝑦 → (log‘𝑥) = (log‘𝑦)) | |
| 14 | 13 | cbvmptv 5201 | . . . . 5 ⊢ (𝑥 ∈ ℝ+ ↦ (log‘𝑥)) = (𝑦 ∈ ℝ+ ↦ (log‘𝑦)) |
| 15 | 14 | eleq1i 2852 | . . . 4 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ↔ (𝑦 ∈ ℝ+ ↦ (log‘𝑦)) ∈ 𝑂(1)) |
| 16 | 15 | biimpi 218 | . . 3 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) → (𝑦 ∈ ℝ+ ↦ (log‘𝑦)) ∈ 𝑂(1)) |
| 17 | 12, 16 | o1res2 15580 | . 2 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) → (𝑦 ∈ (1(,)+∞) ↦ (log‘𝑦)) ∈ 𝑂(1)) |
| 18 | 1red 11175 | . . . . 5 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) → 1 ∈ ℝ) | |
| 19 | 18 | rexrd 11225 | . . . 4 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) → 1 ∈ ℝ*) |
| 20 | 18 | renepnfd 11226 | . . . 4 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) → 1 ≠ +∞) |
| 21 | ioopnfsup 13867 | . . . 4 ⊢ ((1 ∈ ℝ* ∧ 1 ≠ +∞) → sup((1(,)+∞), ℝ*, < ) = +∞) | |
| 22 | 19, 20, 21 | syl2anc 593 | . . 3 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) → sup((1(,)+∞), ℝ*, < ) = +∞) |
| 23 | divlogrlim 26687 | . . . 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 26681 | . . . 4 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → (log‘𝑦) ∈ ℝ+) |
| 26 | 25 | rpcnd 13032 | . . 3 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → (log‘𝑦) ∈ ℂ) |
| 27 | 25 | rpne0d 13035 | . . 3 ⊢ (((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) ∧ 𝑦 ∈ (1(,)+∞)) → (log‘𝑦) ≠ 0) |
| 28 | 22, 24, 26, 27 | rlimno1 15671 | . 2 ⊢ ((𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) → ¬ (𝑦 ∈ (1(,)+∞) ↦ (log‘𝑦)) ∈ 𝑂(1)) |
| 29 | 17, 28 | pm2.65i 195 | 1 ⊢ ¬ (𝑥 ∈ ℝ+ ↦ (log‘𝑥)) ∈ 𝑂(1) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ∧ wa 399 = wceq 1559 ∈ wcel 2141 ≠ wne 2956 class class class wbr 5097 ↦ cmpt 5178 ‘cfv 6515 (class class class)co 7390 supcsup 9379 ℝcr 11065 0cc0 11066 1c1 11067 +∞cpnf 11206 ℝ*cxr 11208 < clt 11209 / cdiv 11837 ℝ+crp 12986 (,)cioo 13342 ⇝𝑟 crli 15502 𝑂(1)co1 15503 logclog 26606 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-10 2174 ax-11 2190 ax-12 2211 ax-ext 2733 ax-rep 5224 ax-sep 5243 ax-nul 5253 ax-pow 5319 ax-pr 5387 ax-un 7712 ax-inf2 9589 ax-cnex 11122 ax-resscn 11123 ax-1cn 11124 ax-icn 11125 ax-addcl 11126 ax-addrcl 11127 ax-mulcl 11128 ax-mulrcl 11129 ax-mulcom 11130 ax-addass 11131 ax-mulass 11132 ax-distr 11133 ax-i2m1 11134 ax-1ne0 11135 ax-1rid 11136 ax-rnegex 11137 ax-rrecex 11138 ax-cnre 11139 ax-pre-lttri 11140 ax-pre-lttrn 11141 ax-pre-ltadd 11142 ax-pre-mulgt0 11143 ax-pre-sup 11144 ax-addf 11145 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1098 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-nf 1803 df-sb 2090 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3061 df-ral 3076 df-rex 3086 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4284 df-if 4478 df-pw 4554 df-sn 4580 df-pr 4582 df-tp 4584 df-op 4586 df-uni 4863 df-int 4903 df-iun 4948 df-iin 4949 df-br 5098 df-opab 5160 df-mpt 5179 df-tr 5205 df-id 5538 df-eprel 5543 df-po 5551 df-so 5552 df-fr 5596 df-se 5597 df-we 5598 df-xp 5649 df-rel 5650 df-cnv 5651 df-co 5652 df-dm 5653 df-rn 5654 df-res 5655 df-ima 5656 df-pred 6282 df-ord 6343 df-on 6344 df-lim 6345 df-suc 6346 df-iota 6471 df-fun 6517 df-fn 6518 df-f 6519 df-f1 6520 df-fo 6521 df-f1o 6522 df-fv 6523 df-isom 6524 df-riota 7347 df-ov 7393 df-oprab 7394 df-mpo 7395 df-of 7654 df-om 7841 df-1st 7964 df-2nd 7965 df-supp 8134 df-frecs 8255 df-wrecs 8286 df-recs 8335 df-rdg 8374 df-1o 8430 df-2o 8431 df-er 8671 df-map 8803 df-pm 8804 df-ixp 8873 df-en 8921 df-dom 8922 df-sdom 8923 df-fin 8924 df-fsupp 9301 df-fi 9350 df-sup 9381 df-inf 9382 df-oi 9451 df-card 9890 df-pnf 11211 df-mnf 11212 df-xr 11213 df-ltxr 11214 df-le 11215 df-sub 11409 df-neg 11410 df-div 11838 df-nn 12204 df-2 12273 df-3 12274 df-4 12275 df-5 12276 df-6 12277 df-7 12278 df-8 12279 df-9 12280 df-n0 12475 df-z 12562 df-dec 12682 df-uz 12833 df-q 12943 df-rp 12987 df-xneg 13107 df-xadd 13108 df-xmul 13109 df-ioo 13346 df-ioc 13347 df-ico 13348 df-icc 13349 df-fz 13506 df-fzo 13653 df-fl 13795 df-mod 13873 df-seq 14008 df-exp 14068 df-fac 14280 df-bc 14309 df-hash 14337 df-shft 15073 df-cj 15116 df-re 15117 df-im 15118 df-sqrt 15252 df-abs 15253 df-limsup 15488 df-clim 15505 df-rlim 15506 df-o1 15507 df-lo1 15508 df-sum 15704 df-ef 16087 df-sin 16089 df-cos 16090 df-pi 16092 df-struct 17173 df-sets 17190 df-slot 17208 df-ndx 17220 df-base 17236 df-ress 17257 df-plusg 17289 df-mulr 17290 df-starv 17291 df-sca 17292 df-vsca 17293 df-ip 17294 df-tset 17295 df-ple 17296 df-ds 17298 df-unif 17299 df-hom 17300 df-cco 17301 df-rest 17441 df-topn 17442 df-0g 17460 df-gsum 17461 df-topgen 17462 df-pt 17463 df-prds 17466 df-xrs 17522 df-qtop 17527 df-imas 17528 df-xps 17530 df-mre 17604 df-mrc 17605 df-acs 17607 df-mgm 18664 df-sgrp 18743 df-mnd 18759 df-submnd 18808 df-mulg 19100 df-cntz 19347 df-cmn 19812 df-psmet 21403 df-xmet 21404 df-met 21405 df-bl 21406 df-mopn 21407 df-fbas 21408 df-fg 21409 df-cnfld 21412 df-top 22941 df-topon 22958 df-topsp 22980 df-bases 22993 df-cld 23066 df-ntr 23067 df-cls 23068 df-nei 23145 df-lp 23183 df-perf 23184 df-cn 23274 df-cnp 23275 df-haus 23362 df-tx 23609 df-hmeo 23802 df-fil 23893 df-fm 23985 df-flim 23986 df-flf 23987 df-xms 24367 df-ms 24368 df-tms 24369 df-cncf 24927 df-limc 25915 df-dv 25916 df-log 26608 |
| This theorem is referenced by: dchrisum0fno1 27562 dchrisum0re 27564 dirith2 27579 |
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