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| Mirrors > Home > MPE Home > Th. List > Mathboxes > dig2nn0 | Structured version Visualization version GIF version | ||
| Description: A digit of a nonnegative integer 𝑁 in a binary system is either 0 or 1. (Contributed by AV, 24-May-2020.) |
| Ref | Expression |
|---|---|
| dig2nn0 | ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℤ) → (𝐾(digit‘2)𝑁) ∈ {0, 1}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 2nn 12338 | . . . 4 ⊢ 2 ∈ ℕ | |
| 2 | 1 | a1i 11 | . . 3 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℤ) → 2 ∈ ℕ) |
| 3 | simpr 490 | . . 3 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℤ) → 𝐾 ∈ ℤ) | |
| 4 | nn0rp0 13508 | . . . 4 ⊢ (𝑁 ∈ ℕ0 → 𝑁 ∈ (0[,)+∞)) | |
| 5 | 4 | adantr 486 | . . 3 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℤ) → 𝑁 ∈ (0[,)+∞)) |
| 6 | digval 49528 | . . 3 ⊢ ((2 ∈ ℕ ∧ 𝐾 ∈ ℤ ∧ 𝑁 ∈ (0[,)+∞)) → (𝐾(digit‘2)𝑁) = ((⌊‘((2↑-𝐾) · 𝑁)) mod 2)) | |
| 7 | 2, 3, 5, 6 | syl3anc 1398 | . 2 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℤ) → (𝐾(digit‘2)𝑁) = ((⌊‘((2↑-𝐾) · 𝑁)) mod 2)) |
| 8 | 2re 12339 | . . . . . . 7 ⊢ 2 ∈ ℝ | |
| 9 | 8 | a1i 11 | . . . . . 6 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℤ) → 2 ∈ ℝ) |
| 10 | 2ne0 12371 | . . . . . . 7 ⊢ 2 ≠ 0 | |
| 11 | 10 | a1i 11 | . . . . . 6 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℤ) → 2 ≠ 0) |
| 12 | znegcl 12653 | . . . . . . 7 ⊢ (𝐾 ∈ ℤ → -𝐾 ∈ ℤ) | |
| 13 | 12 | adantl 487 | . . . . . 6 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℤ) → -𝐾 ∈ ℤ) |
| 14 | 9, 11, 13 | reexpclzd 14313 | . . . . 5 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℤ) → (2↑-𝐾) ∈ ℝ) |
| 15 | nn0re 12537 | . . . . . 6 ⊢ (𝑁 ∈ ℕ0 → 𝑁 ∈ ℝ) | |
| 16 | 15 | adantr 486 | . . . . 5 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℤ) → 𝑁 ∈ ℝ) |
| 17 | 14, 16 | remulcld 11263 | . . . 4 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℤ) → ((2↑-𝐾) · 𝑁) ∈ ℝ) |
| 18 | 17 | flcld 13859 | . . 3 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℤ) → (⌊‘((2↑-𝐾) · 𝑁)) ∈ ℤ) |
| 19 | elmod2 48249 | . . 3 ⊢ ((⌊‘((2↑-𝐾) · 𝑁)) ∈ ℤ → ((⌊‘((2↑-𝐾) · 𝑁)) mod 2) ∈ {0, 1}) | |
| 20 | 18, 19 | syl 18 | . 2 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℤ) → ((⌊‘((2↑-𝐾) · 𝑁)) mod 2) ∈ {0, 1}) |
| 21 | 7, 20 | eqeltrd 2860 | 1 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℤ) → (𝐾(digit‘2)𝑁) ∈ {0, 1}) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2145 ≠ wne 2955 {cpr 4586 ‘cfv 6533 (class class class)co 7413 ℝcr 11123 0cc0 11124 1c1 11125 · cmul 11129 +∞cpnf 11264 -cneg 11466 ℕcn 12257 2c2 12319 ℕ0cn0 12528 ℤcz 12615 [,)cico 13400 ⌊cfl 13851 mod cmo 13930 ↑cexp 14125 digitcdig 49525 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-rep 5232 ax-sep 5251 ax-nul 5263 ax-pow 5330 ax-pr 5398 ax-un 7736 ax-cnex 11180 ax-resscn 11181 ax-1cn 11182 ax-icn 11183 ax-addcl 11184 ax-addrcl 11185 ax-mulcl 11186 ax-mulrcl 11187 ax-mulcom 11188 ax-addass 11189 ax-mulass 11190 ax-distr 11191 ax-i2m1 11192 ax-1ne0 11193 ax-1rid 11194 ax-rnegex 11195 ax-rrecex 11196 ax-cnre 11197 ax-pre-lttri 11198 ax-pre-lttrn 11199 ax-pre-ltadd 11200 ax-pre-mulgt0 11201 ax-pre-sup 11202 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6299 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-riota 7370 df-ov 7416 df-oprab 7417 df-mpo 7418 df-om 7863 df-1st 7986 df-2nd 7987 df-frecs 8280 df-wrecs 8311 df-recs 8360 df-rdg 8399 df-er 8696 df-en 8953 df-dom 8954 df-sdom 8955 df-sup 9412 df-inf 9413 df-pnf 11269 df-mnf 11270 df-xr 11271 df-ltxr 11272 df-le 11273 df-sub 11467 df-neg 11468 df-div 11896 df-nn 12258 df-2 12327 df-n0 12529 df-z 12616 df-uz 12888 df-rp 13043 df-ico 13404 df-fz 13562 df-fzo 13710 df-fl 13853 df-mod 13931 df-seq 14066 df-exp 14126 df-dig 49526 |
| This theorem is used by: (None) |
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