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| Mirrors > Home > MPE Home > Th. List > bitsp1o | Structured version Visualization version GIF version | ||
| Description: The 𝑀 + 1-th bit of 2𝑁 + 1 is the 𝑀-th bit of 𝑁. (Contributed by Mario Carneiro, 5-Sep-2016.) |
| Ref | Expression |
|---|---|
| bitsp1o | ⊢ ((𝑁 ∈ ℤ ∧ 𝑀 ∈ ℕ0) → ((𝑀 + 1) ∈ (bits‘((2 · 𝑁) + 1)) ↔ 𝑀 ∈ (bits‘𝑁))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 2z 12709 | . . . . . 6 ⊢ 2 ∈ ℤ | |
| 2 | 1 | a1i 11 | . . . . 5 ⊢ (𝑁 ∈ ℤ → 2 ∈ ℤ) |
| 3 | id 23 | . . . . 5 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℤ) | |
| 4 | 2, 3 | zmulcld 12790 | . . . 4 ⊢ (𝑁 ∈ ℤ → (2 · 𝑁) ∈ ℤ) |
| 5 | 4 | peano2zd 12787 | . . 3 ⊢ (𝑁 ∈ ℤ → ((2 · 𝑁) + 1) ∈ ℤ) |
| 6 | bitsp1 16581 | . . 3 ⊢ ((((2 · 𝑁) + 1) ∈ ℤ ∧ 𝑀 ∈ ℕ0) → ((𝑀 + 1) ∈ (bits‘((2 · 𝑁) + 1)) ↔ 𝑀 ∈ (bits‘(⌊‘(((2 · 𝑁) + 1) / 2))))) | |
| 7 | 5, 6 | sylan 592 | . 2 ⊢ ((𝑁 ∈ ℤ ∧ 𝑀 ∈ ℕ0) → ((𝑀 + 1) ∈ (bits‘((2 · 𝑁) + 1)) ↔ 𝑀 ∈ (bits‘(⌊‘(((2 · 𝑁) + 1) / 2))))) |
| 8 | 2re 12398 | . . . . . . . . . . . 12 ⊢ 2 ∈ ℝ | |
| 9 | 8 | a1i 11 | . . . . . . . . . . 11 ⊢ (𝑁 ∈ ℤ → 2 ∈ ℝ) |
| 10 | zre 12678 | . . . . . . . . . . 11 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℝ) | |
| 11 | 9, 10 | remulcld 11320 | . . . . . . . . . 10 ⊢ (𝑁 ∈ ℤ → (2 · 𝑁) ∈ ℝ) |
| 12 | 11 | recnd 11318 | . . . . . . . . 9 ⊢ (𝑁 ∈ ℤ → (2 · 𝑁) ∈ ℂ) |
| 13 | 1cnd 11283 | . . . . . . . . 9 ⊢ (𝑁 ∈ ℤ → 1 ∈ ℂ) | |
| 14 | 2cnd 12402 | . . . . . . . . 9 ⊢ (𝑁 ∈ ℤ → 2 ∈ ℂ) | |
| 15 | 2ne0 12430 | . . . . . . . . . 10 ⊢ 2 ≠ 0 | |
| 16 | 15 | a1i 11 | . . . . . . . . 9 ⊢ (𝑁 ∈ ℤ → 2 ≠ 0) |
| 17 | 12, 13, 14, 16 | divdird 12112 | . . . . . . . 8 ⊢ (𝑁 ∈ ℤ → (((2 · 𝑁) + 1) / 2) = (((2 · 𝑁) / 2) + (1 / 2))) |
| 18 | zcn 12679 | . . . . . . . . . 10 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℂ) | |
| 19 | 18, 14, 16 | divcan3d 12079 | . . . . . . . . 9 ⊢ (𝑁 ∈ ℤ → ((2 · 𝑁) / 2) = 𝑁) |
| 20 | 19 | oveq1d 7427 | . . . . . . . 8 ⊢ (𝑁 ∈ ℤ → (((2 · 𝑁) / 2) + (1 / 2)) = (𝑁 + (1 / 2))) |
| 21 | 17, 20 | eqtrd 2796 | . . . . . . 7 ⊢ (𝑁 ∈ ℤ → (((2 · 𝑁) + 1) / 2) = (𝑁 + (1 / 2))) |
| 22 | 21 | fveq2d 6881 | . . . . . 6 ⊢ (𝑁 ∈ ℤ → (⌊‘(((2 · 𝑁) + 1) / 2)) = (⌊‘(𝑁 + (1 / 2)))) |
| 23 | halfge0 12543 | . . . . . . . 8 ⊢ 0 ≤ (1 / 2) | |
| 24 | halflt1 12544 | . . . . . . . 8 ⊢ (1 / 2) < 1 | |
| 25 | 23, 24 | pm3.2i 476 | . . . . . . 7 ⊢ (0 ≤ (1 / 2) ∧ (1 / 2) < 1) |
| 26 | halfre 12540 | . . . . . . . 8 ⊢ (1 / 2) ∈ ℝ | |
| 27 | flbi2 13937 | . . . . . . . 8 ⊢ ((𝑁 ∈ ℤ ∧ (1 / 2) ∈ ℝ) → ((⌊‘(𝑁 + (1 / 2))) = 𝑁 ↔ (0 ≤ (1 / 2) ∧ (1 / 2) < 1))) | |
| 28 | 26, 27 | mpan2 704 | . . . . . . 7 ⊢ (𝑁 ∈ ℤ → ((⌊‘(𝑁 + (1 / 2))) = 𝑁 ↔ (0 ≤ (1 / 2) ∧ (1 / 2) < 1))) |
| 29 | 25, 28 | mpbiri 261 | . . . . . 6 ⊢ (𝑁 ∈ ℤ → (⌊‘(𝑁 + (1 / 2))) = 𝑁) |
| 30 | 22, 29 | eqtrd 2796 | . . . . 5 ⊢ (𝑁 ∈ ℤ → (⌊‘(((2 · 𝑁) + 1) / 2)) = 𝑁) |
| 31 | 30 | adantr 486 | . . . 4 ⊢ ((𝑁 ∈ ℤ ∧ 𝑀 ∈ ℕ0) → (⌊‘(((2 · 𝑁) + 1) / 2)) = 𝑁) |
| 32 | 31 | fveq2d 6881 | . . 3 ⊢ ((𝑁 ∈ ℤ ∧ 𝑀 ∈ ℕ0) → (bits‘(⌊‘(((2 · 𝑁) + 1) / 2))) = (bits‘𝑁)) |
| 33 | 32 | eleq2d 2847 | . 2 ⊢ ((𝑁 ∈ ℤ ∧ 𝑀 ∈ ℕ0) → (𝑀 ∈ (bits‘(⌊‘(((2 · 𝑁) + 1) / 2))) ↔ 𝑀 ∈ (bits‘𝑁))) |
| 34 | 7, 33 | bitrd 282 | 1 ⊢ ((𝑁 ∈ ℤ ∧ 𝑀 ∈ ℕ0) → ((𝑀 + 1) ∈ (bits‘((2 · 𝑁) + 1)) ↔ 𝑀 ∈ (bits‘𝑁))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2145 ≠ wne 2956 class class class wbr 5103 ‘cfv 6531 (class class class)co 7412 ℝcr 11180 0cc0 11181 1c1 11182 + caddc 11184 · cmul 11186 < clt 11324 ≤ cle 11325 / cdiv 11954 2c2 12378 ℕ0cn0 12587 ℤcz 12674 ⌊cfl 13910 bitscbits 16569 |
| 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 2733 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7740 ax-cnex 11237 ax-resscn 11238 ax-1cn 11239 ax-icn 11240 ax-addcl 11241 ax-addrcl 11242 ax-mulcl 11243 ax-mulrcl 11244 ax-mulcom 11245 ax-addass 11246 ax-mulass 11247 ax-distr 11248 ax-i2m1 11249 ax-1ne0 11250 ax-1rid 11251 ax-rnegex 11252 ax-rrecex 11253 ax-cnre 11254 ax-pre-lttri 11255 ax-pre-lttrn 11256 ax-pre-ltadd 11257 ax-pre-mulgt0 11258 ax-pre-sup 11259 |
| 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 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3453 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 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6297 df-ord 6358 df-on 6359 df-lim 6360 df-suc 6361 df-iota 6487 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-fv 6539 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7867 df-2nd 7991 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 df-er 8701 df-en 8958 df-dom 8959 df-sdom 8960 df-sup 9418 df-inf 9419 df-pnf 11326 df-mnf 11327 df-xr 11328 df-ltxr 11329 df-le 11330 df-sub 11524 df-neg 11525 df-div 11955 df-nn 12317 df-2 12386 df-n0 12588 df-z 12675 df-uz 12947 df-fl 13912 df-seq 14125 df-exp 14185 df-bits 16572 |
| This theorem is used by: (None) |
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