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| Mirrors > Home > MPE Home > Th. List > swrdlen | Structured version Visualization version GIF version | ||
| Description: Length of an extracted subword. (Contributed by Stefan O'Rear, 16-Aug-2015.) |
| Ref | Expression |
|---|---|
| swrdlen | ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝐹 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝑆))) → (♯‘(𝑆 substr 〈𝐹, 𝐿〉)) = (𝐿 − 𝐹)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fvex 6895 | . . . . 5 ⊢ (𝑆‘(𝑥 + 𝐹)) ∈ V | |
| 2 | eqid 2762 | . . . . 5 ⊢ (𝑥 ∈ (0..^(𝐿 − 𝐹)) ↦ (𝑆‘(𝑥 + 𝐹))) = (𝑥 ∈ (0..^(𝐿 − 𝐹)) ↦ (𝑆‘(𝑥 + 𝐹))) | |
| 3 | 1, 2 | fnmpti 6679 | . . . 4 ⊢ (𝑥 ∈ (0..^(𝐿 − 𝐹)) ↦ (𝑆‘(𝑥 + 𝐹))) Fn (0..^(𝐿 − 𝐹)) |
| 4 | swrdval2 14718 | . . . . 5 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝐹 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝑆))) → (𝑆 substr 〈𝐹, 𝐿〉) = (𝑥 ∈ (0..^(𝐿 − 𝐹)) ↦ (𝑆‘(𝑥 + 𝐹)))) | |
| 5 | 4 | fneq1d 6629 | . . . 4 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝐹 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝑆))) → ((𝑆 substr 〈𝐹, 𝐿〉) Fn (0..^(𝐿 − 𝐹)) ↔ (𝑥 ∈ (0..^(𝐿 − 𝐹)) ↦ (𝑆‘(𝑥 + 𝐹))) Fn (0..^(𝐿 − 𝐹)))) |
| 6 | 3, 5 | mpbiri 261 | . . 3 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝐹 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝑆))) → (𝑆 substr 〈𝐹, 𝐿〉) Fn (0..^(𝐿 − 𝐹))) |
| 7 | hashfn 14443 | . . 3 ⊢ ((𝑆 substr 〈𝐹, 𝐿〉) Fn (0..^(𝐿 − 𝐹)) → (♯‘(𝑆 substr 〈𝐹, 𝐿〉)) = (♯‘(0..^(𝐿 − 𝐹)))) | |
| 8 | 6, 7 | syl 18 | . 2 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝐹 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝑆))) → (♯‘(𝑆 substr 〈𝐹, 𝐿〉)) = (♯‘(0..^(𝐿 − 𝐹)))) |
| 9 | fznn0sub 13615 | . . . 4 ⊢ (𝐹 ∈ (0...𝐿) → (𝐿 − 𝐹) ∈ ℕ0) | |
| 10 | 9 | 3ad2ant2 1152 | . . 3 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝐹 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝑆))) → (𝐿 − 𝐹) ∈ ℕ0) |
| 11 | hashfzo0 14499 | . . 3 ⊢ ((𝐿 − 𝐹) ∈ ℕ0 → (♯‘(0..^(𝐿 − 𝐹))) = (𝐿 − 𝐹)) | |
| 12 | 10, 11 | syl 18 | . 2 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝐹 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝑆))) → (♯‘(0..^(𝐿 − 𝐹))) = (𝐿 − 𝐹)) |
| 13 | 8, 12 | eqtrd 2797 | 1 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝐹 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝑆))) → (♯‘(𝑆 substr 〈𝐹, 𝐿〉)) = (𝐿 − 𝐹)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ w3a 1103 = wceq 1570 ∈ wcel 2145 〈cop 4593 ↦ cmpt 5190 Fn wfn 6532 ‘cfv 6537 (class class class)co 7417 0cc0 11128 + caddc 11131 − cmin 11469 ℕ0cn0 12532 ...cfz 13565 ..^cfzo 13713 ♯chash 14398 Word cword 14582 substr csubstr 14712 |
| 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 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 |
| 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 7374 df-ov 7420 df-oprab 7421 df-mpo 7422 df-om 7867 df-1st 7990 df-2nd 7991 df-frecs 8284 df-wrecs 8315 df-recs 8364 df-rdg 8403 df-1o 8459 df-er 8700 df-en 8957 df-dom 8958 df-sdom 8959 df-fin 8960 df-card 9948 df-pnf 11273 df-mnf 11274 df-xr 11275 df-ltxr 11276 df-le 11277 df-sub 11471 df-neg 11472 df-nn 12262 df-n0 12533 df-z 12620 df-uz 12892 df-fz 13566 df-fzo 13714 df-hash 14399 df-word 14583 df-substr 14713 |
| This theorem is used by: swrdf 14722 swrdrlen 14733 swrdlen2 14734 swrds1 14740 ccatswrd 14742 swrdccat2 14743 ccatpfx 14774 swrdswrd 14778 pfxccatin12lem2 14804 pfxccatin12 14806 spllen 14827 revpfxsfxrev 14841 cshwlen 14874 cshwidxmod 14878 efgredleme 19876 splfv3 33406 cycpmco2lem3 33576 cycpmco2lem4 33577 cycpmco2lem5 33578 cycpmco2lem6 33579 cycpmco2 33581 |
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