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Mirrors > Home > MPE Home > Th. List > Mathboxes > blen0 | Structured version Visualization version GIF version |
Description: The binary length of 0. (Contributed by AV, 20-May-2020.) |
Ref | Expression |
---|---|
blen0 | ⊢ (#b‘0) = 1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | c0ex 10638 | . . 3 ⊢ 0 ∈ V | |
2 | blenval 44638 | . . 3 ⊢ (0 ∈ V → (#b‘0) = if(0 = 0, 1, ((⌊‘(2 logb (abs‘0))) + 1))) | |
3 | 1, 2 | ax-mp 5 | . 2 ⊢ (#b‘0) = if(0 = 0, 1, ((⌊‘(2 logb (abs‘0))) + 1)) |
4 | eqid 2824 | . . 3 ⊢ 0 = 0 | |
5 | 4 | iftruei 4477 | . 2 ⊢ if(0 = 0, 1, ((⌊‘(2 logb (abs‘0))) + 1)) = 1 |
6 | 3, 5 | eqtri 2847 | 1 ⊢ (#b‘0) = 1 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1536 ∈ wcel 2113 Vcvv 3497 ifcif 4470 ‘cfv 6358 (class class class)co 7159 0cc0 10540 1c1 10541 + caddc 10543 2c2 11695 ⌊cfl 13163 abscabs 14596 logb clogb 25345 #bcblen 44636 |
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 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2796 ax-sep 5206 ax-nul 5213 ax-pr 5333 ax-1cn 10598 ax-icn 10599 ax-addcl 10600 ax-mulcl 10602 ax-i2m1 10608 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-mo 2621 df-eu 2653 df-clab 2803 df-cleq 2817 df-clel 2896 df-nfc 2966 df-ral 3146 df-rex 3147 df-rab 3150 df-v 3499 df-sbc 3776 df-dif 3942 df-un 3944 df-in 3946 df-ss 3955 df-nul 4295 df-if 4471 df-sn 4571 df-pr 4573 df-op 4577 df-uni 4842 df-br 5070 df-opab 5132 df-mpt 5150 df-id 5463 df-xp 5564 df-rel 5565 df-cnv 5566 df-co 5567 df-dm 5568 df-iota 6317 df-fun 6360 df-fv 6366 df-ov 7162 df-blen 44637 |
This theorem is referenced by: blennn0elnn 44644 blen1b 44655 nn0sumshdiglem1 44688 |
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