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Mirrors > Home > MPE Home > Th. List > Mathboxes > nnlog2ge0lt1 | Structured version Visualization version GIF version |
Description: A positive integer is 1 iff its binary logarithm is between 0 and 1. (Contributed by AV, 30-May-2020.) |
Ref | Expression |
---|---|
nnlog2ge0lt1 | ⊢ (𝑁 ∈ ℕ → (𝑁 = 1 ↔ (0 ≤ (2 logb 𝑁) ∧ (2 logb 𝑁) < 1))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0le0 12338 | . . . . 5 ⊢ 0 ≤ 0 | |
2 | 2cn 12312 | . . . . . 6 ⊢ 2 ∈ ℂ | |
3 | 2ne0 12341 | . . . . . 6 ⊢ 2 ≠ 0 | |
4 | 1ne2 12445 | . . . . . . 7 ⊢ 1 ≠ 2 | |
5 | 4 | necomi 2985 | . . . . . 6 ⊢ 2 ≠ 1 |
6 | logb1 26714 | . . . . . 6 ⊢ ((2 ∈ ℂ ∧ 2 ≠ 0 ∧ 2 ≠ 1) → (2 logb 1) = 0) | |
7 | 2, 3, 5, 6 | mp3an 1457 | . . . . 5 ⊢ (2 logb 1) = 0 |
8 | 1, 7 | breqtrri 5171 | . . . 4 ⊢ 0 ≤ (2 logb 1) |
9 | 0lt1 11761 | . . . . 5 ⊢ 0 < 1 | |
10 | 7, 9 | eqbrtri 5165 | . . . 4 ⊢ (2 logb 1) < 1 |
11 | 8, 10 | pm3.2i 469 | . . 3 ⊢ (0 ≤ (2 logb 1) ∧ (2 logb 1) < 1) |
12 | oveq2 7421 | . . . . 5 ⊢ (𝑁 = 1 → (2 logb 𝑁) = (2 logb 1)) | |
13 | 12 | breq2d 5156 | . . . 4 ⊢ (𝑁 = 1 → (0 ≤ (2 logb 𝑁) ↔ 0 ≤ (2 logb 1))) |
14 | 12 | breq1d 5154 | . . . 4 ⊢ (𝑁 = 1 → ((2 logb 𝑁) < 1 ↔ (2 logb 1) < 1)) |
15 | 13, 14 | anbi12d 630 | . . 3 ⊢ (𝑁 = 1 → ((0 ≤ (2 logb 𝑁) ∧ (2 logb 𝑁) < 1) ↔ (0 ≤ (2 logb 1) ∧ (2 logb 1) < 1))) |
16 | 11, 15 | mpbiri 257 | . 2 ⊢ (𝑁 = 1 → (0 ≤ (2 logb 𝑁) ∧ (2 logb 𝑁) < 1)) |
17 | 2z 12619 | . . . . . . 7 ⊢ 2 ∈ ℤ | |
18 | uzid 12862 | . . . . . . 7 ⊢ (2 ∈ ℤ → 2 ∈ (ℤ≥‘2)) | |
19 | 17, 18 | ax-mp 5 | . . . . . 6 ⊢ 2 ∈ (ℤ≥‘2) |
20 | 19 | a1i 11 | . . . . 5 ⊢ (𝑁 ∈ ℕ → 2 ∈ (ℤ≥‘2)) |
21 | nnrp 13012 | . . . . 5 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℝ+) | |
22 | logbge0b 47744 | . . . . 5 ⊢ ((2 ∈ (ℤ≥‘2) ∧ 𝑁 ∈ ℝ+) → (0 ≤ (2 logb 𝑁) ↔ 1 ≤ 𝑁)) | |
23 | 20, 21, 22 | syl2anc 582 | . . . 4 ⊢ (𝑁 ∈ ℕ → (0 ≤ (2 logb 𝑁) ↔ 1 ≤ 𝑁)) |
24 | logblt1b 47745 | . . . . 5 ⊢ ((2 ∈ (ℤ≥‘2) ∧ 𝑁 ∈ ℝ+) → ((2 logb 𝑁) < 1 ↔ 𝑁 < 2)) | |
25 | 20, 21, 24 | syl2anc 582 | . . . 4 ⊢ (𝑁 ∈ ℕ → ((2 logb 𝑁) < 1 ↔ 𝑁 < 2)) |
26 | 23, 25 | anbi12d 630 | . . 3 ⊢ (𝑁 ∈ ℕ → ((0 ≤ (2 logb 𝑁) ∧ (2 logb 𝑁) < 1) ↔ (1 ≤ 𝑁 ∧ 𝑁 < 2))) |
27 | df-2 12300 | . . . . . . . 8 ⊢ 2 = (1 + 1) | |
28 | 27 | breq2i 5152 | . . . . . . 7 ⊢ (𝑁 < 2 ↔ 𝑁 < (1 + 1)) |
29 | 28 | a1i 11 | . . . . . 6 ⊢ (𝑁 ∈ ℕ → (𝑁 < 2 ↔ 𝑁 < (1 + 1))) |
30 | 29 | anbi2d 628 | . . . . 5 ⊢ (𝑁 ∈ ℕ → ((1 ≤ 𝑁 ∧ 𝑁 < 2) ↔ (1 ≤ 𝑁 ∧ 𝑁 < (1 + 1)))) |
31 | nnre 12244 | . . . . . 6 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℝ) | |
32 | 1zzd 12618 | . . . . . 6 ⊢ (𝑁 ∈ ℕ → 1 ∈ ℤ) | |
33 | flbi 13808 | . . . . . 6 ⊢ ((𝑁 ∈ ℝ ∧ 1 ∈ ℤ) → ((⌊‘𝑁) = 1 ↔ (1 ≤ 𝑁 ∧ 𝑁 < (1 + 1)))) | |
34 | 31, 32, 33 | syl2anc 582 | . . . . 5 ⊢ (𝑁 ∈ ℕ → ((⌊‘𝑁) = 1 ↔ (1 ≤ 𝑁 ∧ 𝑁 < (1 + 1)))) |
35 | 30, 34 | bitr4d 281 | . . . 4 ⊢ (𝑁 ∈ ℕ → ((1 ≤ 𝑁 ∧ 𝑁 < 2) ↔ (⌊‘𝑁) = 1)) |
36 | nnz 12604 | . . . . . . . . 9 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℤ) | |
37 | flid 13800 | . . . . . . . . 9 ⊢ (𝑁 ∈ ℤ → (⌊‘𝑁) = 𝑁) | |
38 | 36, 37 | syl 17 | . . . . . . . 8 ⊢ (𝑁 ∈ ℕ → (⌊‘𝑁) = 𝑁) |
39 | 38 | eqcomd 2731 | . . . . . . 7 ⊢ (𝑁 ∈ ℕ → 𝑁 = (⌊‘𝑁)) |
40 | 39 | adantr 479 | . . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ (⌊‘𝑁) = 1) → 𝑁 = (⌊‘𝑁)) |
41 | simpr 483 | . . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ (⌊‘𝑁) = 1) → (⌊‘𝑁) = 1) | |
42 | 40, 41 | eqtrd 2765 | . . . . 5 ⊢ ((𝑁 ∈ ℕ ∧ (⌊‘𝑁) = 1) → 𝑁 = 1) |
43 | 42 | ex 411 | . . . 4 ⊢ (𝑁 ∈ ℕ → ((⌊‘𝑁) = 1 → 𝑁 = 1)) |
44 | 35, 43 | sylbid 239 | . . 3 ⊢ (𝑁 ∈ ℕ → ((1 ≤ 𝑁 ∧ 𝑁 < 2) → 𝑁 = 1)) |
45 | 26, 44 | sylbid 239 | . 2 ⊢ (𝑁 ∈ ℕ → ((0 ≤ (2 logb 𝑁) ∧ (2 logb 𝑁) < 1) → 𝑁 = 1)) |
46 | 16, 45 | impbid2 225 | 1 ⊢ (𝑁 ∈ ℕ → (𝑁 = 1 ↔ (0 ≤ (2 logb 𝑁) ∧ (2 logb 𝑁) < 1))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 394 = wceq 1533 ∈ wcel 2098 ≠ wne 2930 class class class wbr 5144 ‘cfv 6543 (class class class)co 7413 ℂcc 11131 ℝcr 11132 0cc0 11133 1c1 11134 + caddc 11136 < clt 11273 ≤ cle 11274 ℕcn 12237 2c2 12292 ℤcz 12583 ℤ≥cuz 12847 ℝ+crp 13001 ⌊cfl 13782 logb clogb 26709 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2696 ax-rep 5281 ax-sep 5295 ax-nul 5302 ax-pow 5360 ax-pr 5424 ax-un 7735 ax-inf2 9659 ax-cnex 11189 ax-resscn 11190 ax-1cn 11191 ax-icn 11192 ax-addcl 11193 ax-addrcl 11194 ax-mulcl 11195 ax-mulrcl 11196 ax-mulcom 11197 ax-addass 11198 ax-mulass 11199 ax-distr 11200 ax-i2m1 11201 ax-1ne0 11202 ax-1rid 11203 ax-rnegex 11204 ax-rrecex 11205 ax-cnre 11206 ax-pre-lttri 11207 ax-pre-lttrn 11208 ax-pre-ltadd 11209 ax-pre-mulgt0 11210 ax-pre-sup 11211 ax-addf 11212 |
This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2703 df-cleq 2717 df-clel 2802 df-nfc 2877 df-ne 2931 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3364 df-reu 3365 df-rab 3420 df-v 3465 df-sbc 3771 df-csb 3887 df-dif 3944 df-un 3946 df-in 3948 df-ss 3958 df-pss 3961 df-nul 4320 df-if 4526 df-pw 4601 df-sn 4626 df-pr 4628 df-tp 4630 df-op 4632 df-uni 4905 df-int 4946 df-iun 4994 df-iin 4995 df-br 5145 df-opab 5207 df-mpt 5228 df-tr 5262 df-id 5571 df-eprel 5577 df-po 5585 df-so 5586 df-fr 5628 df-se 5629 df-we 5630 df-xp 5679 df-rel 5680 df-cnv 5681 df-co 5682 df-dm 5683 df-rn 5684 df-res 5685 df-ima 5686 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-isom 6552 df-riota 7369 df-ov 7416 df-oprab 7417 df-mpo 7418 df-of 7679 df-om 7866 df-1st 7987 df-2nd 7988 df-supp 8159 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-1o 8480 df-2o 8481 df-er 8718 df-map 8840 df-pm 8841 df-ixp 8910 df-en 8958 df-dom 8959 df-sdom 8960 df-fin 8961 df-fsupp 9381 df-fi 9429 df-sup 9460 df-inf 9461 df-oi 9528 df-card 9957 df-pnf 11275 df-mnf 11276 df-xr 11277 df-ltxr 11278 df-le 11279 df-sub 11471 df-neg 11472 df-div 11897 df-nn 12238 df-2 12300 df-3 12301 df-4 12302 df-5 12303 df-6 12304 df-7 12305 df-8 12306 df-9 12307 df-n0 12498 df-z 12584 df-dec 12703 df-uz 12848 df-q 12958 df-rp 13002 df-xneg 13119 df-xadd 13120 df-xmul 13121 df-ioo 13355 df-ioc 13356 df-ico 13357 df-icc 13358 df-fz 13512 df-fzo 13655 df-fl 13784 df-mod 13862 df-seq 13994 df-exp 14054 df-fac 14260 df-bc 14289 df-hash 14317 df-shft 15041 df-cj 15073 df-re 15074 df-im 15075 df-sqrt 15209 df-abs 15210 df-limsup 15442 df-clim 15459 df-rlim 15460 df-sum 15660 df-ef 16038 df-sin 16040 df-cos 16041 df-pi 16043 df-struct 17110 df-sets 17127 df-slot 17145 df-ndx 17157 df-base 17175 df-ress 17204 df-plusg 17240 df-mulr 17241 df-starv 17242 df-sca 17243 df-vsca 17244 df-ip 17245 df-tset 17246 df-ple 17247 df-ds 17249 df-unif 17250 df-hom 17251 df-cco 17252 df-rest 17398 df-topn 17399 df-0g 17417 df-gsum 17418 df-topgen 17419 df-pt 17420 df-prds 17423 df-xrs 17478 df-qtop 17483 df-imas 17484 df-xps 17486 df-mre 17560 df-mrc 17561 df-acs 17563 df-mgm 18594 df-sgrp 18673 df-mnd 18689 df-submnd 18735 df-mulg 19023 df-cntz 19267 df-cmn 19736 df-psmet 21270 df-xmet 21271 df-met 21272 df-bl 21273 df-mopn 21274 df-fbas 21275 df-fg 21276 df-cnfld 21279 df-top 22809 df-topon 22826 df-topsp 22848 df-bases 22862 df-cld 22936 df-ntr 22937 df-cls 22938 df-nei 23015 df-lp 23053 df-perf 23054 df-cn 23144 df-cnp 23145 df-haus 23232 df-tx 23479 df-hmeo 23672 df-fil 23763 df-fm 23855 df-flim 23856 df-flf 23857 df-xms 24239 df-ms 24240 df-tms 24241 df-cncf 24811 df-limc 25808 df-dv 25809 df-log 26503 df-logb 26710 |
This theorem is referenced by: blen1b 47769 |
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