| Mathbox for Thierry Arnoux |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > MPE Home > Th. List > Mathboxes > signshlen | Structured version Visualization version GIF version | ||
| Description: Length of 𝐻, corresponding to the word 𝐹 multiplied by (𝑥 − 𝐶). (Contributed by Thierry Arnoux, 14-Oct-2018.) |
| Ref | Expression |
|---|---|
| signsv.p | ⊢ ⨣ = (𝑎 ∈ {-1, 0, 1}, 𝑏 ∈ {-1, 0, 1} ↦ if(𝑏 = 0, 𝑎, 𝑏)) |
| signsv.w | ⊢ 𝑊 = {〈(Base‘ndx), {-1, 0, 1}〉, 〈(+g‘ndx), ⨣ 〉} |
| signsv.t | ⊢ 𝑇 = (𝑓 ∈ Word ℝ ↦ (𝑛 ∈ (0..^(♯‘𝑓)) ↦ (𝑊 Σg (𝑖 ∈ (0...𝑛) ↦ (sgn‘(𝑓‘𝑖)))))) |
| signsv.v | ⊢ 𝑉 = (𝑓 ∈ Word ℝ ↦ Σ𝑗 ∈ (1..^(♯‘𝑓))if(((𝑇‘𝑓)‘𝑗) ≠ ((𝑇‘𝑓)‘(𝑗 − 1)), 1, 0)) |
| signs.h | ⊢ 𝐻 = ((〈“0”〉 ++ 𝐹) ∘f − ((𝐹 ++ 〈“0”〉) ∘f/c · 𝐶)) |
| Ref | Expression |
|---|---|
| signshlen | ⊢ ((𝐹 ∈ Word ℝ ∧ 𝐶 ∈ ℝ+) → (♯‘𝐻) = ((♯‘𝐹) + 1)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | signsv.p | . . . 4 ⊢ ⨣ = (𝑎 ∈ {-1, 0, 1}, 𝑏 ∈ {-1, 0, 1} ↦ if(𝑏 = 0, 𝑎, 𝑏)) | |
| 2 | signsv.w | . . . 4 ⊢ 𝑊 = {〈(Base‘ndx), {-1, 0, 1}〉, 〈(+g‘ndx), ⨣ 〉} | |
| 3 | signsv.t | . . . 4 ⊢ 𝑇 = (𝑓 ∈ Word ℝ ↦ (𝑛 ∈ (0..^(♯‘𝑓)) ↦ (𝑊 Σg (𝑖 ∈ (0...𝑛) ↦ (sgn‘(𝑓‘𝑖)))))) | |
| 4 | signsv.v | . . . 4 ⊢ 𝑉 = (𝑓 ∈ Word ℝ ↦ Σ𝑗 ∈ (1..^(♯‘𝑓))if(((𝑇‘𝑓)‘𝑗) ≠ ((𝑇‘𝑓)‘(𝑗 − 1)), 1, 0)) | |
| 5 | signs.h | . . . 4 ⊢ 𝐻 = ((〈“0”〉 ++ 𝐹) ∘f − ((𝐹 ++ 〈“0”〉) ∘f/c · 𝐶)) | |
| 6 | 1, 2, 3, 4, 5 | signshf 34734 | . . 3 ⊢ ((𝐹 ∈ Word ℝ ∧ 𝐶 ∈ ℝ+) → 𝐻:(0..^((♯‘𝐹) + 1))⟶ℝ) |
| 7 | ffn 6670 | . . 3 ⊢ (𝐻:(0..^((♯‘𝐹) + 1))⟶ℝ → 𝐻 Fn (0..^((♯‘𝐹) + 1))) | |
| 8 | hashfn 14339 | . . 3 ⊢ (𝐻 Fn (0..^((♯‘𝐹) + 1)) → (♯‘𝐻) = (♯‘(0..^((♯‘𝐹) + 1)))) | |
| 9 | 6, 7, 8 | 3syl 18 | . 2 ⊢ ((𝐹 ∈ Word ℝ ∧ 𝐶 ∈ ℝ+) → (♯‘𝐻) = (♯‘(0..^((♯‘𝐹) + 1)))) |
| 10 | lencl 14497 | . . . . 5 ⊢ (𝐹 ∈ Word ℝ → (♯‘𝐹) ∈ ℕ0) | |
| 11 | 10 | adantr 480 | . . . 4 ⊢ ((𝐹 ∈ Word ℝ ∧ 𝐶 ∈ ℝ+) → (♯‘𝐹) ∈ ℕ0) |
| 12 | 1nn0 12455 | . . . . 5 ⊢ 1 ∈ ℕ0 | |
| 13 | 12 | a1i 11 | . . . 4 ⊢ ((𝐹 ∈ Word ℝ ∧ 𝐶 ∈ ℝ+) → 1 ∈ ℕ0) |
| 14 | 11, 13 | nn0addcld 12504 | . . 3 ⊢ ((𝐹 ∈ Word ℝ ∧ 𝐶 ∈ ℝ+) → ((♯‘𝐹) + 1) ∈ ℕ0) |
| 15 | hashfzo0 14394 | . . 3 ⊢ (((♯‘𝐹) + 1) ∈ ℕ0 → (♯‘(0..^((♯‘𝐹) + 1))) = ((♯‘𝐹) + 1)) | |
| 16 | 14, 15 | syl 17 | . 2 ⊢ ((𝐹 ∈ Word ℝ ∧ 𝐶 ∈ ℝ+) → (♯‘(0..^((♯‘𝐹) + 1))) = ((♯‘𝐹) + 1)) |
| 17 | 9, 16 | eqtrd 2772 | 1 ⊢ ((𝐹 ∈ Word ℝ ∧ 𝐶 ∈ ℝ+) → (♯‘𝐻) = ((♯‘𝐹) + 1)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1542 ∈ wcel 2114 ≠ wne 2933 ifcif 4467 {cpr 4570 {ctp 4572 〈cop 4574 ↦ cmpt 5167 Fn wfn 6495 ⟶wf 6496 ‘cfv 6500 (class class class)co 7369 ∈ cmpo 7371 ∘f cof 7631 ℝcr 11039 0cc0 11040 1c1 11041 + caddc 11043 · cmul 11045 − cmin 11379 -cneg 11380 ℕ0cn0 12439 ℝ+crp 12944 ...cfz 13463 ..^cfzo 13610 ♯chash 14294 Word cword 14477 ++ cconcat 14534 〈“cs1 14560 sgncsgn 15050 Σcsu 15650 ndxcnx 17165 Basecbs 17181 +gcplusg 17222 Σg cgsu 17405 ∘f/c cofc 34241 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5213 ax-sep 5232 ax-nul 5242 ax-pow 5308 ax-pr 5376 ax-un 7691 ax-cnex 11096 ax-resscn 11097 ax-1cn 11098 ax-icn 11099 ax-addcl 11100 ax-addrcl 11101 ax-mulcl 11102 ax-mulrcl 11103 ax-mulcom 11104 ax-addass 11105 ax-mulass 11106 ax-distr 11107 ax-i2m1 11108 ax-1ne0 11109 ax-1rid 11110 ax-rnegex 11111 ax-rrecex 11112 ax-cnre 11113 ax-pre-lttri 11114 ax-pre-lttrn 11115 ax-pre-ltadd 11116 ax-pre-mulgt0 11117 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-int 4891 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5527 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-pred 6267 df-ord 6328 df-on 6329 df-lim 6330 df-suc 6331 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-riota 7326 df-ov 7372 df-oprab 7373 df-mpo 7374 df-of 7633 df-om 7820 df-1st 7944 df-2nd 7945 df-frecs 8233 df-wrecs 8264 df-recs 8313 df-rdg 8351 df-1o 8407 df-er 8645 df-en 8896 df-dom 8897 df-sdom 8898 df-fin 8899 df-card 9865 df-pnf 11183 df-mnf 11184 df-xr 11185 df-ltxr 11186 df-le 11187 df-sub 11381 df-neg 11382 df-nn 12177 df-n0 12440 df-z 12527 df-uz 12791 df-rp 12945 df-fz 13464 df-fzo 13611 df-hash 14295 df-word 14478 df-concat 14535 df-s1 14561 df-ofc 34242 |
| This theorem is referenced by: signshnz 34737 |
| Copyright terms: Public domain | W3C validator |