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| 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 35083 | . . 3 ⊢ ((𝐹 ∈ Word ℝ ∧ 𝐶 ∈ ℝ+) → 𝐻:(0..^((♯‘𝐹) + 1))⟶ℝ) |
| 7 | ffn 6706 | . . 3 ⊢ (𝐻:(0..^((♯‘𝐹) + 1))⟶ℝ → 𝐻 Fn (0..^((♯‘𝐹) + 1))) | |
| 8 | hashfn 14441 | . . 3 ⊢ (𝐻 Fn (0..^((♯‘𝐹) + 1)) → (♯‘𝐻) = (♯‘(0..^((♯‘𝐹) + 1)))) | |
| 9 | 6, 7, 8 | 3syl 19 | . 2 ⊢ ((𝐹 ∈ Word ℝ ∧ 𝐶 ∈ ℝ+) → (♯‘𝐻) = (♯‘(0..^((♯‘𝐹) + 1)))) |
| 10 | lencl 14600 | . . . . 5 ⊢ (𝐹 ∈ Word ℝ → (♯‘𝐹) ∈ ℕ0) | |
| 11 | 10 | adantr 486 | . . . 4 ⊢ ((𝐹 ∈ Word ℝ ∧ 𝐶 ∈ ℝ+) → (♯‘𝐹) ∈ ℕ0) |
| 12 | 1nn0 12547 | . . . . 5 ⊢ 1 ∈ ℕ0 | |
| 13 | 12 | a1i 11 | . . . 4 ⊢ ((𝐹 ∈ Word ℝ ∧ 𝐶 ∈ ℝ+) → 1 ∈ ℕ0) |
| 14 | 11, 13 | nn0addcld 12596 | . . 3 ⊢ ((𝐹 ∈ Word ℝ ∧ 𝐶 ∈ ℝ+) → ((♯‘𝐹) + 1) ∈ ℕ0) |
| 15 | hashfzo0 14497 | . . 3 ⊢ (((♯‘𝐹) + 1) ∈ ℕ0 → (♯‘(0..^((♯‘𝐹) + 1))) = ((♯‘𝐹) + 1)) | |
| 16 | 14, 15 | syl 18 | . 2 ⊢ ((𝐹 ∈ Word ℝ ∧ 𝐶 ∈ ℝ+) → (♯‘(0..^((♯‘𝐹) + 1))) = ((♯‘𝐹) + 1)) |
| 17 | 9, 16 | eqtrd 2797 | 1 ⊢ ((𝐹 ∈ Word ℝ ∧ 𝐶 ∈ ℝ+) → (♯‘𝐻) = ((♯‘𝐹) + 1)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2145 ≠ wne 2957 ifcif 4485 {cpr 4589 {ctp 4591 〈cop 4593 ↦ cmpt 5190 Fn wfn 6532 ⟶wf 6533 ‘cfv 6537 (class class class)co 7416 ∈ cmpo 7418 ∘f cof 7679 ℝcr 11126 0cc0 11127 1c1 11128 + caddc 11130 · cmul 11132 − cmin 11468 -cneg 11469 ℕ0cn0 12531 ℝ+crp 13044 ...cfz 13563 ..^cfzo 13711 ♯chash 14396 Word cword 14580 ++ cconcat 14637 〈“cs1 14664 sgncsgn 15161 Σcsu 15775 ndxcnx 17289 Basecbs 17305 +gcplusg 17346 Σg cgsu 17529 ∘f/c cofc 34592 |
| 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-rep 5236 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7739 ax-cnex 11183 ax-resscn 11184 ax-1cn 11185 ax-icn 11186 ax-addcl 11187 ax-addrcl 11188 ax-mulcl 11189 ax-mulrcl 11190 ax-mulcom 11191 ax-addass 11192 ax-mulass 11193 ax-distr 11194 ax-i2m1 11195 ax-1ne0 11196 ax-1rid 11197 ax-rnegex 11198 ax-rrecex 11199 ax-cnre 11200 ax-pre-lttri 11201 ax-pre-lttrn 11202 ax-pre-ltadd 11203 ax-pre-mulgt0 11204 |
| 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-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-int 4911 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 7373 df-ov 7419 df-oprab 7420 df-mpo 7421 df-of 7681 df-om 7866 df-1st 7989 df-2nd 7990 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 df-1o 8458 df-er 8699 df-en 8956 df-dom 8957 df-sdom 8958 df-fin 8959 df-card 9947 df-pnf 11272 df-mnf 11273 df-xr 11274 df-ltxr 11275 df-le 11276 df-sub 11470 df-neg 11471 df-nn 12261 df-n0 12532 df-z 12619 df-uz 12891 df-rp 13045 df-fz 13564 df-fzo 13712 df-hash 14397 df-word 14581 df-concat 14638 df-s1 14665 df-ofc 34593 |
| This theorem is used by: signshnz 35086 |
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