| Mathbox for Alexander van der Vekens |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > blenn0 | Structured version Visualization version GIF version | ||
| Description: The binary length of a "number" not being 0. (Contributed by AV, 20-May-2020.) |
| Ref | Expression |
|---|---|
| blenn0 | ⊢ ((𝑁 ∈ 𝑉 ∧ 𝑁 ≠ 0) → (#b‘𝑁) = ((⌊‘(2 logb (abs‘𝑁))) + 1)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | blenval 48696 | . 2 ⊢ (𝑁 ∈ 𝑉 → (#b‘𝑁) = if(𝑁 = 0, 1, ((⌊‘(2 logb (abs‘𝑁))) + 1))) | |
| 2 | ifnefalse 4486 | . 2 ⊢ (𝑁 ≠ 0 → if(𝑁 = 0, 1, ((⌊‘(2 logb (abs‘𝑁))) + 1)) = ((⌊‘(2 logb (abs‘𝑁))) + 1)) | |
| 3 | 1, 2 | sylan9eq 2788 | 1 ⊢ ((𝑁 ∈ 𝑉 ∧ 𝑁 ≠ 0) → (#b‘𝑁) = ((⌊‘(2 logb (abs‘𝑁))) + 1)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1541 ∈ wcel 2113 ≠ wne 2929 ifcif 4474 ‘cfv 6486 (class class class)co 7352 0cc0 11013 1c1 11014 + caddc 11016 2c2 12187 ⌊cfl 13696 abscabs 15143 logb clogb 26702 #bcblen 48694 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2182 ax-ext 2705 ax-sep 5236 ax-nul 5246 ax-pr 5372 ax-1cn 11071 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2537 df-eu 2566 df-clab 2712 df-cleq 2725 df-clel 2808 df-nfc 2882 df-ne 2930 df-ral 3049 df-rex 3058 df-rab 3397 df-v 3439 df-dif 3901 df-un 3903 df-ss 3915 df-nul 4283 df-if 4475 df-sn 4576 df-pr 4578 df-op 4582 df-uni 4859 df-br 5094 df-opab 5156 df-mpt 5175 df-id 5514 df-xp 5625 df-rel 5626 df-cnv 5627 df-co 5628 df-dm 5629 df-iota 6442 df-fun 6488 df-fv 6494 df-ov 7355 df-blen 48695 |
| This theorem is referenced by: blenre 48699 blennn 48700 |
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