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Mirrors > Home > MPE Home > Th. List > logdifbnd | Structured version Visualization version GIF version |
Description: Bound on the difference of logs. (Contributed by Mario Carneiro, 23-May-2016.) |
Ref | Expression |
---|---|
logdifbnd | ⊢ (𝐴 ∈ ℝ+ → ((log‘(𝐴 + 1)) − (log‘𝐴)) ≤ (1 / 𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rpcn 12387 | . . . . . 6 ⊢ (𝐴 ∈ ℝ+ → 𝐴 ∈ ℂ) | |
2 | 1cnd 10624 | . . . . . 6 ⊢ (𝐴 ∈ ℝ+ → 1 ∈ ℂ) | |
3 | rpne0 12393 | . . . . . 6 ⊢ (𝐴 ∈ ℝ+ → 𝐴 ≠ 0) | |
4 | 1, 2, 1, 3 | divdird 11442 | . . . . 5 ⊢ (𝐴 ∈ ℝ+ → ((𝐴 + 1) / 𝐴) = ((𝐴 / 𝐴) + (1 / 𝐴))) |
5 | 1, 3 | dividd 11402 | . . . . . 6 ⊢ (𝐴 ∈ ℝ+ → (𝐴 / 𝐴) = 1) |
6 | 5 | oveq1d 7160 | . . . . 5 ⊢ (𝐴 ∈ ℝ+ → ((𝐴 / 𝐴) + (1 / 𝐴)) = (1 + (1 / 𝐴))) |
7 | 4, 6 | eqtr2d 2854 | . . . 4 ⊢ (𝐴 ∈ ℝ+ → (1 + (1 / 𝐴)) = ((𝐴 + 1) / 𝐴)) |
8 | 7 | fveq2d 6667 | . . 3 ⊢ (𝐴 ∈ ℝ+ → (log‘(1 + (1 / 𝐴))) = (log‘((𝐴 + 1) / 𝐴))) |
9 | 1rp 12381 | . . . . 5 ⊢ 1 ∈ ℝ+ | |
10 | rpaddcl 12399 | . . . . 5 ⊢ ((𝐴 ∈ ℝ+ ∧ 1 ∈ ℝ+) → (𝐴 + 1) ∈ ℝ+) | |
11 | 9, 10 | mpan2 687 | . . . 4 ⊢ (𝐴 ∈ ℝ+ → (𝐴 + 1) ∈ ℝ+) |
12 | relogdiv 25103 | . . . 4 ⊢ (((𝐴 + 1) ∈ ℝ+ ∧ 𝐴 ∈ ℝ+) → (log‘((𝐴 + 1) / 𝐴)) = ((log‘(𝐴 + 1)) − (log‘𝐴))) | |
13 | 11, 12 | mpancom 684 | . . 3 ⊢ (𝐴 ∈ ℝ+ → (log‘((𝐴 + 1) / 𝐴)) = ((log‘(𝐴 + 1)) − (log‘𝐴))) |
14 | 8, 13 | eqtrd 2853 | . 2 ⊢ (𝐴 ∈ ℝ+ → (log‘(1 + (1 / 𝐴))) = ((log‘(𝐴 + 1)) − (log‘𝐴))) |
15 | rpreccl 12403 | . . . . . 6 ⊢ (𝐴 ∈ ℝ+ → (1 / 𝐴) ∈ ℝ+) | |
16 | rpaddcl 12399 | . . . . . 6 ⊢ ((1 ∈ ℝ+ ∧ (1 / 𝐴) ∈ ℝ+) → (1 + (1 / 𝐴)) ∈ ℝ+) | |
17 | 9, 15, 16 | sylancr 587 | . . . . 5 ⊢ (𝐴 ∈ ℝ+ → (1 + (1 / 𝐴)) ∈ ℝ+) |
18 | 17 | reeflogd 25134 | . . . 4 ⊢ (𝐴 ∈ ℝ+ → (exp‘(log‘(1 + (1 / 𝐴)))) = (1 + (1 / 𝐴))) |
19 | 17 | rpred 12419 | . . . . 5 ⊢ (𝐴 ∈ ℝ+ → (1 + (1 / 𝐴)) ∈ ℝ) |
20 | 15 | rpred 12419 | . . . . . 6 ⊢ (𝐴 ∈ ℝ+ → (1 / 𝐴) ∈ ℝ) |
21 | 20 | reefcld 15429 | . . . . 5 ⊢ (𝐴 ∈ ℝ+ → (exp‘(1 / 𝐴)) ∈ ℝ) |
22 | efgt1p 15456 | . . . . . 6 ⊢ ((1 / 𝐴) ∈ ℝ+ → (1 + (1 / 𝐴)) < (exp‘(1 / 𝐴))) | |
23 | 15, 22 | syl 17 | . . . . 5 ⊢ (𝐴 ∈ ℝ+ → (1 + (1 / 𝐴)) < (exp‘(1 / 𝐴))) |
24 | 19, 21, 23 | ltled 10776 | . . . 4 ⊢ (𝐴 ∈ ℝ+ → (1 + (1 / 𝐴)) ≤ (exp‘(1 / 𝐴))) |
25 | 18, 24 | eqbrtrd 5079 | . . 3 ⊢ (𝐴 ∈ ℝ+ → (exp‘(log‘(1 + (1 / 𝐴)))) ≤ (exp‘(1 / 𝐴))) |
26 | relogcl 25086 | . . . . . . 7 ⊢ ((𝐴 + 1) ∈ ℝ+ → (log‘(𝐴 + 1)) ∈ ℝ) | |
27 | 11, 26 | syl 17 | . . . . . 6 ⊢ (𝐴 ∈ ℝ+ → (log‘(𝐴 + 1)) ∈ ℝ) |
28 | relogcl 25086 | . . . . . 6 ⊢ (𝐴 ∈ ℝ+ → (log‘𝐴) ∈ ℝ) | |
29 | 27, 28 | resubcld 11056 | . . . . 5 ⊢ (𝐴 ∈ ℝ+ → ((log‘(𝐴 + 1)) − (log‘𝐴)) ∈ ℝ) |
30 | 14, 29 | eqeltrd 2910 | . . . 4 ⊢ (𝐴 ∈ ℝ+ → (log‘(1 + (1 / 𝐴))) ∈ ℝ) |
31 | efle 15459 | . . . 4 ⊢ (((log‘(1 + (1 / 𝐴))) ∈ ℝ ∧ (1 / 𝐴) ∈ ℝ) → ((log‘(1 + (1 / 𝐴))) ≤ (1 / 𝐴) ↔ (exp‘(log‘(1 + (1 / 𝐴)))) ≤ (exp‘(1 / 𝐴)))) | |
32 | 30, 20, 31 | syl2anc 584 | . . 3 ⊢ (𝐴 ∈ ℝ+ → ((log‘(1 + (1 / 𝐴))) ≤ (1 / 𝐴) ↔ (exp‘(log‘(1 + (1 / 𝐴)))) ≤ (exp‘(1 / 𝐴)))) |
33 | 25, 32 | mpbird 258 | . 2 ⊢ (𝐴 ∈ ℝ+ → (log‘(1 + (1 / 𝐴))) ≤ (1 / 𝐴)) |
34 | 14, 33 | eqbrtrrd 5081 | 1 ⊢ (𝐴 ∈ ℝ+ → ((log‘(𝐴 + 1)) − (log‘𝐴)) ≤ (1 / 𝐴)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 207 = wceq 1528 ∈ wcel 2105 class class class wbr 5057 ‘cfv 6348 (class class class)co 7145 ℝcr 10524 1c1 10526 + caddc 10528 < clt 10663 ≤ cle 10664 − cmin 10858 / cdiv 11285 ℝ+crp 12377 expce 15403 logclog 25065 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1787 ax-4 1801 ax-5 1902 ax-6 1961 ax-7 2006 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2151 ax-12 2167 ax-ext 2790 ax-rep 5181 ax-sep 5194 ax-nul 5201 ax-pow 5257 ax-pr 5320 ax-un 7450 ax-inf2 9092 ax-cnex 10581 ax-resscn 10582 ax-1cn 10583 ax-icn 10584 ax-addcl 10585 ax-addrcl 10586 ax-mulcl 10587 ax-mulrcl 10588 ax-mulcom 10589 ax-addass 10590 ax-mulass 10591 ax-distr 10592 ax-i2m1 10593 ax-1ne0 10594 ax-1rid 10595 ax-rnegex 10596 ax-rrecex 10597 ax-cnre 10598 ax-pre-lttri 10599 ax-pre-lttrn 10600 ax-pre-ltadd 10601 ax-pre-mulgt0 10602 ax-pre-sup 10603 ax-addf 10604 ax-mulf 10605 |
This theorem depends on definitions: df-bi 208 df-an 397 df-or 842 df-3or 1080 df-3an 1081 df-tru 1531 df-fal 1541 df-ex 1772 df-nf 1776 df-sb 2061 df-mo 2615 df-eu 2647 df-clab 2797 df-cleq 2811 df-clel 2890 df-nfc 2960 df-ne 3014 df-nel 3121 df-ral 3140 df-rex 3141 df-reu 3142 df-rmo 3143 df-rab 3144 df-v 3494 df-sbc 3770 df-csb 3881 df-dif 3936 df-un 3938 df-in 3940 df-ss 3949 df-pss 3951 df-nul 4289 df-if 4464 df-pw 4537 df-sn 4558 df-pr 4560 df-tp 4562 df-op 4564 df-uni 4831 df-int 4868 df-iun 4912 df-iin 4913 df-br 5058 df-opab 5120 df-mpt 5138 df-tr 5164 df-id 5453 df-eprel 5458 df-po 5467 df-so 5468 df-fr 5507 df-se 5508 df-we 5509 df-xp 5554 df-rel 5555 df-cnv 5556 df-co 5557 df-dm 5558 df-rn 5559 df-res 5560 df-ima 5561 df-pred 6141 df-ord 6187 df-on 6188 df-lim 6189 df-suc 6190 df-iota 6307 df-fun 6350 df-fn 6351 df-f 6352 df-f1 6353 df-fo 6354 df-f1o 6355 df-fv 6356 df-isom 6357 df-riota 7103 df-ov 7148 df-oprab 7149 df-mpo 7150 df-of 7398 df-om 7570 df-1st 7678 df-2nd 7679 df-supp 7820 df-wrecs 7936 df-recs 7997 df-rdg 8035 df-1o 8091 df-2o 8092 df-oadd 8095 df-er 8278 df-map 8397 df-pm 8398 df-ixp 8450 df-en 8498 df-dom 8499 df-sdom 8500 df-fin 8501 df-fsupp 8822 df-fi 8863 df-sup 8894 df-inf 8895 df-oi 8962 df-card 9356 df-pnf 10665 df-mnf 10666 df-xr 10667 df-ltxr 10668 df-le 10669 df-sub 10860 df-neg 10861 df-div 11286 df-nn 11627 df-2 11688 df-3 11689 df-4 11690 df-5 11691 df-6 11692 df-7 11693 df-8 11694 df-9 11695 df-n0 11886 df-z 11970 df-dec 12087 df-uz 12232 df-q 12337 df-rp 12378 df-xneg 12495 df-xadd 12496 df-xmul 12497 df-ioo 12730 df-ioc 12731 df-ico 12732 df-icc 12733 df-fz 12881 df-fzo 13022 df-fl 13150 df-mod 13226 df-seq 13358 df-exp 13418 df-fac 13622 df-bc 13651 df-hash 13679 df-shft 14414 df-cj 14446 df-re 14447 df-im 14448 df-sqrt 14582 df-abs 14583 df-limsup 14816 df-clim 14833 df-rlim 14834 df-sum 15031 df-ef 15409 df-sin 15411 df-cos 15412 df-pi 15414 df-struct 16473 df-ndx 16474 df-slot 16475 df-base 16477 df-sets 16478 df-ress 16479 df-plusg 16566 df-mulr 16567 df-starv 16568 df-sca 16569 df-vsca 16570 df-ip 16571 df-tset 16572 df-ple 16573 df-ds 16575 df-unif 16576 df-hom 16577 df-cco 16578 df-rest 16684 df-topn 16685 df-0g 16703 df-gsum 16704 df-topgen 16705 df-pt 16706 df-prds 16709 df-xrs 16763 df-qtop 16768 df-imas 16769 df-xps 16771 df-mre 16845 df-mrc 16846 df-acs 16848 df-mgm 17840 df-sgrp 17889 df-mnd 17900 df-submnd 17945 df-mulg 18163 df-cntz 18385 df-cmn 18837 df-psmet 20465 df-xmet 20466 df-met 20467 df-bl 20468 df-mopn 20469 df-fbas 20470 df-fg 20471 df-cnfld 20474 df-top 21430 df-topon 21447 df-topsp 21469 df-bases 21482 df-cld 21555 df-ntr 21556 df-cls 21557 df-nei 21634 df-lp 21672 df-perf 21673 df-cn 21763 df-cnp 21764 df-haus 21851 df-tx 22098 df-hmeo 22291 df-fil 22382 df-fm 22474 df-flim 22475 df-flf 22476 df-xms 22857 df-ms 22858 df-tms 22859 df-cncf 23413 df-limc 24391 df-dv 24392 df-log 25067 |
This theorem is referenced by: emcllem2 25501 lgamgulmlem3 25535 selberg2lem 26053 pntrlog2bndlem5 26084 |
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