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Mirrors > Home > MPE Home > Th. List > swrdfv0 | Structured version Visualization version GIF version |
Description: The first symbol in an extracted subword. (Contributed by AV, 27-Apr-2022.) |
Ref | Expression |
---|---|
swrdfv0 | ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝐹 ∈ (0..^𝐿) ∧ 𝐿 ∈ (0...(♯‘𝑆))) → ((𝑆 substr ⟨𝐹, 𝐿⟩)‘0) = (𝑆‘𝐹)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elfzofz 13648 | . . . 4 ⊢ (𝐹 ∈ (0..^𝐿) → 𝐹 ∈ (0...𝐿)) | |
2 | 1 | 3anim2i 1154 | . . 3 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝐹 ∈ (0..^𝐿) ∧ 𝐿 ∈ (0...(♯‘𝑆))) → (𝑆 ∈ Word 𝐴 ∧ 𝐹 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝑆)))) |
3 | fzonnsub 13657 | . . . . 5 ⊢ (𝐹 ∈ (0..^𝐿) → (𝐿 − 𝐹) ∈ ℕ) | |
4 | 3 | 3ad2ant2 1135 | . . . 4 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝐹 ∈ (0..^𝐿) ∧ 𝐿 ∈ (0...(♯‘𝑆))) → (𝐿 − 𝐹) ∈ ℕ) |
5 | lbfzo0 13672 | . . . 4 ⊢ (0 ∈ (0..^(𝐿 − 𝐹)) ↔ (𝐿 − 𝐹) ∈ ℕ) | |
6 | 4, 5 | sylibr 233 | . . 3 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝐹 ∈ (0..^𝐿) ∧ 𝐿 ∈ (0...(♯‘𝑆))) → 0 ∈ (0..^(𝐿 − 𝐹))) |
7 | swrdfv 14598 | . . 3 ⊢ (((𝑆 ∈ Word 𝐴 ∧ 𝐹 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝑆))) ∧ 0 ∈ (0..^(𝐿 − 𝐹))) → ((𝑆 substr ⟨𝐹, 𝐿⟩)‘0) = (𝑆‘(0 + 𝐹))) | |
8 | 2, 6, 7 | syl2anc 585 | . 2 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝐹 ∈ (0..^𝐿) ∧ 𝐿 ∈ (0...(♯‘𝑆))) → ((𝑆 substr ⟨𝐹, 𝐿⟩)‘0) = (𝑆‘(0 + 𝐹))) |
9 | elfzoelz 13632 | . . . . . 6 ⊢ (𝐹 ∈ (0..^𝐿) → 𝐹 ∈ ℤ) | |
10 | 9 | zcnd 12667 | . . . . 5 ⊢ (𝐹 ∈ (0..^𝐿) → 𝐹 ∈ ℂ) |
11 | 10 | addlidd 11415 | . . . 4 ⊢ (𝐹 ∈ (0..^𝐿) → (0 + 𝐹) = 𝐹) |
12 | 11 | fveq2d 6896 | . . 3 ⊢ (𝐹 ∈ (0..^𝐿) → (𝑆‘(0 + 𝐹)) = (𝑆‘𝐹)) |
13 | 12 | 3ad2ant2 1135 | . 2 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝐹 ∈ (0..^𝐿) ∧ 𝐿 ∈ (0...(♯‘𝑆))) → (𝑆‘(0 + 𝐹)) = (𝑆‘𝐹)) |
14 | 8, 13 | eqtrd 2773 | 1 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝐹 ∈ (0..^𝐿) ∧ 𝐿 ∈ (0...(♯‘𝑆))) → ((𝑆 substr ⟨𝐹, 𝐿⟩)‘0) = (𝑆‘𝐹)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ w3a 1088 = wceq 1542 ∈ wcel 2107 ⟨cop 4635 ‘cfv 6544 (class class class)co 7409 0cc0 11110 + caddc 11113 − cmin 11444 ℕcn 12212 ...cfz 13484 ..^cfzo 13627 ♯chash 14290 Word cword 14464 substr csubstr 14590 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 ax-cnex 11166 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186 ax-pre-mulgt0 11187 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-int 4952 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-riota 7365 df-ov 7412 df-oprab 7413 df-mpo 7414 df-om 7856 df-1st 7975 df-2nd 7976 df-frecs 8266 df-wrecs 8297 df-recs 8371 df-rdg 8410 df-1o 8466 df-er 8703 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-card 9934 df-pnf 11250 df-mnf 11251 df-xr 11252 df-ltxr 11253 df-le 11254 df-sub 11446 df-neg 11447 df-nn 12213 df-n0 12473 df-z 12559 df-uz 12823 df-fz 13485 df-fzo 13628 df-hash 14291 df-word 14465 df-substr 14591 |
This theorem is referenced by: cycpmco2lem4 32288 |
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