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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 12654 | . . . . . 6 ⊢ 2 ∈ ℤ | |
| 2 | 1 | a1i 11 | . . . . 5 ⊢ (𝑁 ∈ ℤ → 2 ∈ ℤ) |
| 3 | id 23 | . . . . 5 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℤ) | |
| 4 | 2, 3 | zmulcld 12735 | . . . 4 ⊢ (𝑁 ∈ ℤ → (2 · 𝑁) ∈ ℤ) |
| 5 | 4 | peano2zd 12732 | . . 3 ⊢ (𝑁 ∈ ℤ → ((2 · 𝑁) + 1) ∈ ℤ) |
| 6 | bitsp1 16527 | . . 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 12343 | . . . . . . . . . . . 12 ⊢ 2 ∈ ℝ | |
| 9 | 8 | a1i 11 | . . . . . . . . . . 11 ⊢ (𝑁 ∈ ℤ → 2 ∈ ℝ) |
| 10 | zre 12623 | . . . . . . . . . . 11 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℝ) | |
| 11 | 9, 10 | remulcld 11267 | . . . . . . . . . 10 ⊢ (𝑁 ∈ ℤ → (2 · 𝑁) ∈ ℝ) |
| 12 | 11 | recnd 11265 | . . . . . . . . 9 ⊢ (𝑁 ∈ ℤ → (2 · 𝑁) ∈ ℂ) |
| 13 | 1cnd 11230 | . . . . . . . . 9 ⊢ (𝑁 ∈ ℤ → 1 ∈ ℂ) | |
| 14 | 2cnd 12347 | . . . . . . . . 9 ⊢ (𝑁 ∈ ℤ → 2 ∈ ℂ) | |
| 15 | 2ne0 12375 | . . . . . . . . . 10 ⊢ 2 ≠ 0 | |
| 16 | 15 | a1i 11 | . . . . . . . . 9 ⊢ (𝑁 ∈ ℤ → 2 ≠ 0) |
| 17 | 12, 13, 14, 16 | divdird 12057 | . . . . . . . 8 ⊢ (𝑁 ∈ ℤ → (((2 · 𝑁) + 1) / 2) = (((2 · 𝑁) / 2) + (1 / 2))) |
| 18 | zcn 12624 | . . . . . . . . . 10 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℂ) | |
| 19 | 18, 14, 16 | divcan3d 12024 | . . . . . . . . 9 ⊢ (𝑁 ∈ ℤ → ((2 · 𝑁) / 2) = 𝑁) |
| 20 | 19 | oveq1d 7432 | . . . . . . . 8 ⊢ (𝑁 ∈ ℤ → (((2 · 𝑁) / 2) + (1 / 2)) = (𝑁 + (1 / 2))) |
| 21 | 17, 20 | eqtrd 2797 | . . . . . . 7 ⊢ (𝑁 ∈ ℤ → (((2 · 𝑁) + 1) / 2) = (𝑁 + (1 / 2))) |
| 22 | 21 | fveq2d 6886 | . . . . . 6 ⊢ (𝑁 ∈ ℤ → (⌊‘(((2 · 𝑁) + 1) / 2)) = (⌊‘(𝑁 + (1 / 2)))) |
| 23 | halfge0 12488 | . . . . . . . 8 ⊢ 0 ≤ (1 / 2) | |
| 24 | halflt1 12489 | . . . . . . . 8 ⊢ (1 / 2) < 1 | |
| 25 | 23, 24 | pm3.2i 476 | . . . . . . 7 ⊢ (0 ≤ (1 / 2) ∧ (1 / 2) < 1) |
| 26 | halfre 12485 | . . . . . . . 8 ⊢ (1 / 2) ∈ ℝ | |
| 27 | flbi2 13882 | . . . . . . . 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 2797 | . . . . 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 6886 | . . 3 ⊢ ((𝑁 ∈ ℤ ∧ 𝑀 ∈ ℕ0) → (bits‘(⌊‘(((2 · 𝑁) + 1) / 2))) = (bits‘𝑁)) |
| 33 | 32 | eleq2d 2848 | . 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 2957 class class class wbr 5107 ‘cfv 6537 (class class class)co 7417 ℝcr 11127 0cc0 11128 1c1 11129 + caddc 11131 · cmul 11133 < clt 11271 ≤ cle 11272 / cdiv 11899 2c2 12323 ℕ0cn0 12532 ℤcz 12619 ⌊cfl 13855 bitscbits 16515 |
| 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 2215 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7740 ax-cnex 11184 ax-resscn 11185 ax-1cn 11186 ax-icn 11187 ax-addcl 11188 ax-addrcl 11189 ax-mulcl 11190 ax-mulrcl 11191 ax-mulcom 11192 ax-addass 11193 ax-mulass 11194 ax-distr 11195 ax-i2m1 11196 ax-1ne0 11197 ax-1rid 11198 ax-rnegex 11199 ax-rrecex 11200 ax-cnre 11201 ax-pre-lttri 11202 ax-pre-lttrn 11203 ax-pre-ltadd 11204 ax-pre-mulgt0 11205 ax-pre-sup 11206 |
| 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 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-rmo 3367 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-iun 4956 df-br 5108 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-we 5614 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7374 df-ov 7420 df-oprab 7421 df-mpo 7422 df-om 7867 df-2nd 7991 df-frecs 8284 df-wrecs 8315 df-recs 8364 df-rdg 8403 df-er 8700 df-en 8957 df-dom 8958 df-sdom 8959 df-sup 9416 df-inf 9417 df-pnf 11273 df-mnf 11274 df-xr 11275 df-ltxr 11276 df-le 11277 df-sub 11471 df-neg 11472 df-div 11900 df-nn 12262 df-2 12331 df-n0 12533 df-z 12620 df-uz 12892 df-fl 13857 df-seq 14070 df-exp 14130 df-bits 16518 |
| This theorem is used by: (None) |
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