Mathbox for Alexander van der Vekens |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > blennnelnn | Structured version Visualization version GIF version |
Description: The binary length of a positive integer is a positive integer. (Contributed by AV, 25-May-2020.) |
Ref | Expression |
---|---|
blennnelnn | ⊢ (𝑁 ∈ ℕ → (#b‘𝑁) ∈ ℕ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | blennn 44563 | . 2 ⊢ (𝑁 ∈ ℕ → (#b‘𝑁) = ((⌊‘(2 logb 𝑁)) + 1)) | |
2 | 2rp 12382 | . . . . . 6 ⊢ 2 ∈ ℝ+ | |
3 | 2 | a1i 11 | . . . . 5 ⊢ (𝑁 ∈ ℕ → 2 ∈ ℝ+) |
4 | nnrp 12388 | . . . . 5 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℝ+) | |
5 | 1ne2 11833 | . . . . . . 7 ⊢ 1 ≠ 2 | |
6 | 5 | necomi 3067 | . . . . . 6 ⊢ 2 ≠ 1 |
7 | 6 | a1i 11 | . . . . 5 ⊢ (𝑁 ∈ ℕ → 2 ≠ 1) |
8 | relogbcl 25278 | . . . . 5 ⊢ ((2 ∈ ℝ+ ∧ 𝑁 ∈ ℝ+ ∧ 2 ≠ 1) → (2 logb 𝑁) ∈ ℝ) | |
9 | 3, 4, 7, 8 | syl3anc 1363 | . . . 4 ⊢ (𝑁 ∈ ℕ → (2 logb 𝑁) ∈ ℝ) |
10 | 2z 12002 | . . . . . 6 ⊢ 2 ∈ ℤ | |
11 | uzid 12246 | . . . . . 6 ⊢ (2 ∈ ℤ → 2 ∈ (ℤ≥‘2)) | |
12 | 10, 11 | mp1i 13 | . . . . 5 ⊢ (𝑁 ∈ ℕ → 2 ∈ (ℤ≥‘2)) |
13 | nnre 11633 | . . . . . 6 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℝ) | |
14 | nnge1 11653 | . . . . . 6 ⊢ (𝑁 ∈ ℕ → 1 ≤ 𝑁) | |
15 | 1re 10629 | . . . . . . 7 ⊢ 1 ∈ ℝ | |
16 | elicopnf 12821 | . . . . . . 7 ⊢ (1 ∈ ℝ → (𝑁 ∈ (1[,)+∞) ↔ (𝑁 ∈ ℝ ∧ 1 ≤ 𝑁))) | |
17 | 15, 16 | ax-mp 5 | . . . . . 6 ⊢ (𝑁 ∈ (1[,)+∞) ↔ (𝑁 ∈ ℝ ∧ 1 ≤ 𝑁)) |
18 | 13, 14, 17 | sylanbrc 583 | . . . . 5 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ (1[,)+∞)) |
19 | rege1logbzge0 44547 | . . . . 5 ⊢ ((2 ∈ (ℤ≥‘2) ∧ 𝑁 ∈ (1[,)+∞)) → 0 ≤ (2 logb 𝑁)) | |
20 | 12, 18, 19 | syl2anc 584 | . . . 4 ⊢ (𝑁 ∈ ℕ → 0 ≤ (2 logb 𝑁)) |
21 | flge0nn0 13178 | . . . 4 ⊢ (((2 logb 𝑁) ∈ ℝ ∧ 0 ≤ (2 logb 𝑁)) → (⌊‘(2 logb 𝑁)) ∈ ℕ0) | |
22 | 9, 20, 21 | syl2anc 584 | . . 3 ⊢ (𝑁 ∈ ℕ → (⌊‘(2 logb 𝑁)) ∈ ℕ0) |
23 | nn0p1nn 11924 | . . 3 ⊢ ((⌊‘(2 logb 𝑁)) ∈ ℕ0 → ((⌊‘(2 logb 𝑁)) + 1) ∈ ℕ) | |
24 | 22, 23 | syl 17 | . 2 ⊢ (𝑁 ∈ ℕ → ((⌊‘(2 logb 𝑁)) + 1) ∈ ℕ) |
25 | 1, 24 | eqeltrd 2910 | 1 ⊢ (𝑁 ∈ ℕ → (#b‘𝑁) ∈ ℕ) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 207 ∧ wa 396 ∈ wcel 2105 ≠ wne 3013 class class class wbr 5057 ‘cfv 6348 (class class class)co 7145 ℝcr 10524 0cc0 10525 1c1 10526 + caddc 10528 +∞cpnf 10660 ≤ cle 10664 ℕcn 11626 2c2 11680 ℕ0cn0 11885 ℤcz 11969 ℤ≥cuz 12231 ℝ+crp 12377 [,)cico 12728 ⌊cfl 13148 logb clogb 25269 #bcblen 44557 |
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 df-logb 25270 df-blen 44558 |
This theorem is referenced by: blennn0elnn 44565 nnpw2blenfzo 44569 nnpw2pmod 44571 nnpw2p 44574 nnolog2flm1 44578 blennn0em1 44579 blengt1fldiv2p1 44581 dig2nn1st 44593 |
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