| 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 48550 | . 2 ⊢ (𝑁 ∈ 𝑉 → (#b‘𝑁) = if(𝑁 = 0, 1, ((⌊‘(2 logb (abs‘𝑁))) + 1))) | |
| 2 | ifnefalse 4502 | . 2 ⊢ (𝑁 ≠ 0 → if(𝑁 = 0, 1, ((⌊‘(2 logb (abs‘𝑁))) + 1)) = ((⌊‘(2 logb (abs‘𝑁))) + 1)) | |
| 3 | 1, 2 | sylan9eq 2785 | 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 1540 ∈ wcel 2109 ≠ wne 2926 ifcif 4490 ‘cfv 6513 (class class class)co 7389 0cc0 11074 1c1 11075 + caddc 11077 2c2 12242 ⌊cfl 13758 abscabs 15206 logb clogb 26680 #bcblen 48548 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2702 ax-sep 5253 ax-nul 5263 ax-pr 5389 ax-1cn 11132 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-ral 3046 df-rex 3055 df-rab 3409 df-v 3452 df-dif 3919 df-un 3921 df-ss 3933 df-nul 4299 df-if 4491 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4874 df-br 5110 df-opab 5172 df-mpt 5191 df-id 5535 df-xp 5646 df-rel 5647 df-cnv 5648 df-co 5649 df-dm 5650 df-iota 6466 df-fun 6515 df-fv 6521 df-ov 7392 df-blen 48549 |
| This theorem is referenced by: blenre 48553 blennn 48554 |
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