Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > pfx1 | Structured version Visualization version GIF version |
Description: The prefix of length one of a nonempty word expressed as a singleton word. (Contributed by AV, 15-May-2020.) |
Ref | Expression |
---|---|
pfx1 | ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑊 ≠ ∅) → (𝑊 prefix 1) = 〈“(𝑊‘0)”〉) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1nn0 12071 | . . . 4 ⊢ 1 ∈ ℕ0 | |
2 | 1 | a1i 11 | . . 3 ⊢ (𝑊 ≠ ∅ → 1 ∈ ℕ0) |
3 | pfxval 14203 | . . 3 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 1 ∈ ℕ0) → (𝑊 prefix 1) = (𝑊 substr 〈0, 1〉)) | |
4 | 2, 3 | sylan2 596 | . 2 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑊 ≠ ∅) → (𝑊 prefix 1) = (𝑊 substr 〈0, 1〉)) |
5 | 1e0p1 12300 | . . . . 5 ⊢ 1 = (0 + 1) | |
6 | 5 | opeq2i 4774 | . . . 4 ⊢ 〈0, 1〉 = 〈0, (0 + 1)〉 |
7 | 6 | oveq2i 7202 | . . 3 ⊢ (𝑊 substr 〈0, 1〉) = (𝑊 substr 〈0, (0 + 1)〉) |
8 | 7 | a1i 11 | . 2 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑊 ≠ ∅) → (𝑊 substr 〈0, 1〉) = (𝑊 substr 〈0, (0 + 1)〉)) |
9 | lennncl 14054 | . . . 4 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑊 ≠ ∅) → (♯‘𝑊) ∈ ℕ) | |
10 | lbfzo0 13247 | . . . 4 ⊢ (0 ∈ (0..^(♯‘𝑊)) ↔ (♯‘𝑊) ∈ ℕ) | |
11 | 9, 10 | sylibr 237 | . . 3 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑊 ≠ ∅) → 0 ∈ (0..^(♯‘𝑊))) |
12 | swrds1 14196 | . . 3 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 0 ∈ (0..^(♯‘𝑊))) → (𝑊 substr 〈0, (0 + 1)〉) = 〈“(𝑊‘0)”〉) | |
13 | 11, 12 | syldan 594 | . 2 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑊 ≠ ∅) → (𝑊 substr 〈0, (0 + 1)〉) = 〈“(𝑊‘0)”〉) |
14 | 4, 8, 13 | 3eqtrd 2775 | 1 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑊 ≠ ∅) → (𝑊 prefix 1) = 〈“(𝑊‘0)”〉) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 399 = wceq 1543 ∈ wcel 2112 ≠ wne 2932 ∅c0 4223 〈cop 4533 ‘cfv 6358 (class class class)co 7191 0cc0 10694 1c1 10695 + caddc 10697 ℕcn 11795 ℕ0cn0 12055 ..^cfzo 13203 ♯chash 13861 Word cword 14034 〈“cs1 14117 substr csubstr 14170 prefix cpfx 14200 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2018 ax-8 2114 ax-9 2122 ax-10 2143 ax-11 2160 ax-12 2177 ax-ext 2708 ax-rep 5164 ax-sep 5177 ax-nul 5184 ax-pow 5243 ax-pr 5307 ax-un 7501 ax-cnex 10750 ax-resscn 10751 ax-1cn 10752 ax-icn 10753 ax-addcl 10754 ax-addrcl 10755 ax-mulcl 10756 ax-mulrcl 10757 ax-mulcom 10758 ax-addass 10759 ax-mulass 10760 ax-distr 10761 ax-i2m1 10762 ax-1ne0 10763 ax-1rid 10764 ax-rnegex 10765 ax-rrecex 10766 ax-cnre 10767 ax-pre-lttri 10768 ax-pre-lttrn 10769 ax-pre-ltadd 10770 ax-pre-mulgt0 10771 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3or 1090 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2073 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2728 df-clel 2809 df-nfc 2879 df-ne 2933 df-nel 3037 df-ral 3056 df-rex 3057 df-reu 3058 df-rab 3060 df-v 3400 df-sbc 3684 df-csb 3799 df-dif 3856 df-un 3858 df-in 3860 df-ss 3870 df-pss 3872 df-nul 4224 df-if 4426 df-pw 4501 df-sn 4528 df-pr 4530 df-tp 4532 df-op 4534 df-uni 4806 df-int 4846 df-iun 4892 df-br 5040 df-opab 5102 df-mpt 5121 df-tr 5147 df-id 5440 df-eprel 5445 df-po 5453 df-so 5454 df-fr 5494 df-we 5496 df-xp 5542 df-rel 5543 df-cnv 5544 df-co 5545 df-dm 5546 df-rn 5547 df-res 5548 df-ima 5549 df-pred 6140 df-ord 6194 df-on 6195 df-lim 6196 df-suc 6197 df-iota 6316 df-fun 6360 df-fn 6361 df-f 6362 df-f1 6363 df-fo 6364 df-f1o 6365 df-fv 6366 df-riota 7148 df-ov 7194 df-oprab 7195 df-mpo 7196 df-om 7623 df-1st 7739 df-2nd 7740 df-wrecs 8025 df-recs 8086 df-rdg 8124 df-1o 8180 df-er 8369 df-en 8605 df-dom 8606 df-sdom 8607 df-fin 8608 df-card 9520 df-pnf 10834 df-mnf 10835 df-xr 10836 df-ltxr 10837 df-le 10838 df-sub 11029 df-neg 11030 df-nn 11796 df-n0 12056 df-z 12142 df-uz 12404 df-fz 13061 df-fzo 13204 df-hash 13862 df-word 14035 df-s1 14118 df-substr 14171 df-pfx 14201 |
This theorem is referenced by: wrdeqs1cat 14250 pfx1s2 30887 |
Copyright terms: Public domain | W3C validator |