| Mathbox for Alexander van der Vekens |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > MPE Home > Th. List > Mathboxes > blennn | Structured version Visualization version GIF version | ||
| Description: The binary length of a positive integer. (Contributed by AV, 21-May-2020.) |
| Ref | Expression |
|---|---|
| blennn | ⊢ (𝑁 ∈ ℕ → (#b‘𝑁) = ((⌊‘(2 logb 𝑁)) + 1)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nnne0 12202 | . . 3 ⊢ (𝑁 ∈ ℕ → 𝑁 ≠ 0) | |
| 2 | blenn0 49061 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ 𝑁 ≠ 0) → (#b‘𝑁) = ((⌊‘(2 logb (abs‘𝑁))) + 1)) | |
| 3 | 1, 2 | mpdan 688 | . 2 ⊢ (𝑁 ∈ ℕ → (#b‘𝑁) = ((⌊‘(2 logb (abs‘𝑁))) + 1)) |
| 4 | nnre 12172 | . . . . . 6 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℝ) | |
| 5 | nnnn0 12435 | . . . . . . 7 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℕ0) | |
| 6 | 5 | nn0ge0d 12492 | . . . . . 6 ⊢ (𝑁 ∈ ℕ → 0 ≤ 𝑁) |
| 7 | 4, 6 | absidd 15376 | . . . . 5 ⊢ (𝑁 ∈ ℕ → (abs‘𝑁) = 𝑁) |
| 8 | 7 | oveq2d 7376 | . . . 4 ⊢ (𝑁 ∈ ℕ → (2 logb (abs‘𝑁)) = (2 logb 𝑁)) |
| 9 | 8 | fveq2d 6838 | . . 3 ⊢ (𝑁 ∈ ℕ → (⌊‘(2 logb (abs‘𝑁))) = (⌊‘(2 logb 𝑁))) |
| 10 | 9 | oveq1d 7375 | . 2 ⊢ (𝑁 ∈ ℕ → ((⌊‘(2 logb (abs‘𝑁))) + 1) = ((⌊‘(2 logb 𝑁)) + 1)) |
| 11 | 3, 10 | eqtrd 2772 | 1 ⊢ (𝑁 ∈ ℕ → (#b‘𝑁) = ((⌊‘(2 logb 𝑁)) + 1)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1542 ∈ wcel 2114 ≠ wne 2933 ‘cfv 6492 (class class class)co 7360 0cc0 11029 1c1 11030 + caddc 11032 ℕcn 12165 2c2 12227 ⌊cfl 13740 abscabs 15187 logb clogb 26741 #bcblen 49057 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5231 ax-nul 5241 ax-pow 5302 ax-pr 5370 ax-un 7682 ax-cnex 11085 ax-resscn 11086 ax-1cn 11087 ax-icn 11088 ax-addcl 11089 ax-addrcl 11090 ax-mulcl 11091 ax-mulrcl 11092 ax-mulcom 11093 ax-addass 11094 ax-mulass 11095 ax-distr 11096 ax-i2m1 11097 ax-1ne0 11098 ax-1rid 11099 ax-rnegex 11100 ax-rrecex 11101 ax-cnre 11102 ax-pre-lttri 11103 ax-pre-lttrn 11104 ax-pre-ltadd 11105 ax-pre-mulgt0 11106 ax-pre-sup 11107 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rmo 3343 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5519 df-eprel 5524 df-po 5532 df-so 5533 df-fr 5577 df-we 5579 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7317 df-ov 7363 df-oprab 7364 df-mpo 7365 df-om 7811 df-2nd 7936 df-frecs 8224 df-wrecs 8255 df-recs 8304 df-rdg 8342 df-er 8636 df-en 8887 df-dom 8888 df-sdom 8889 df-sup 9348 df-pnf 11172 df-mnf 11173 df-xr 11174 df-ltxr 11175 df-le 11176 df-sub 11370 df-neg 11371 df-div 11799 df-nn 12166 df-2 12235 df-3 12236 df-n0 12429 df-z 12516 df-uz 12780 df-rp 12934 df-seq 13955 df-exp 14015 df-cj 15052 df-re 15053 df-im 15054 df-sqrt 15188 df-abs 15189 df-blen 49058 |
| This theorem is referenced by: blennnelnn 49064 blenpw2 49066 blenpw2m1 49067 nnpw2blen 49068 blen1 49072 blen2 49073 blen1b 49076 blennnt2 49077 nnolog2flm1 49078 blennngt2o2 49080 blennn0e2 49082 dig2nn0ld 49092 dig2nn1st 49093 |
| Copyright terms: Public domain | W3C validator |