Mathbox for Alexander van der Vekens |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > pfxtrcfv0 | Structured version Visualization version GIF version |
Description: The first symbol in a word truncated by one symbol. Could replace swrdtrcfv0 13294. (Contributed by AV, 3-May-2020.) |
Ref | Expression |
---|---|
pfxtrcfv0 | ⊢ ((𝑊 ∈ Word 𝑉 ∧ 2 ≤ (#‘𝑊)) → ((𝑊 prefix ((#‘𝑊) − 1))‘0) = (𝑊‘0)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpl 472 | . 2 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 2 ≤ (#‘𝑊)) → 𝑊 ∈ Word 𝑉) | |
2 | wrdlenge2n0 13196 | . 2 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 2 ≤ (#‘𝑊)) → 𝑊 ≠ ∅) | |
3 | 2z 11286 | . . . . . 6 ⊢ 2 ∈ ℤ | |
4 | 3 | a1i 11 | . . . . 5 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 2 ≤ (#‘𝑊)) → 2 ∈ ℤ) |
5 | lencl 13179 | . . . . . . 7 ⊢ (𝑊 ∈ Word 𝑉 → (#‘𝑊) ∈ ℕ0) | |
6 | 5 | nn0zd 11356 | . . . . . 6 ⊢ (𝑊 ∈ Word 𝑉 → (#‘𝑊) ∈ ℤ) |
7 | 6 | adantr 480 | . . . . 5 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 2 ≤ (#‘𝑊)) → (#‘𝑊) ∈ ℤ) |
8 | simpr 476 | . . . . 5 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 2 ≤ (#‘𝑊)) → 2 ≤ (#‘𝑊)) | |
9 | eluz2 11569 | . . . . 5 ⊢ ((#‘𝑊) ∈ (ℤ≥‘2) ↔ (2 ∈ ℤ ∧ (#‘𝑊) ∈ ℤ ∧ 2 ≤ (#‘𝑊))) | |
10 | 4, 7, 8, 9 | syl3anbrc 1239 | . . . 4 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 2 ≤ (#‘𝑊)) → (#‘𝑊) ∈ (ℤ≥‘2)) |
11 | uz2m1nn 11639 | . . . 4 ⊢ ((#‘𝑊) ∈ (ℤ≥‘2) → ((#‘𝑊) − 1) ∈ ℕ) | |
12 | 10, 11 | syl 17 | . . 3 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 2 ≤ (#‘𝑊)) → ((#‘𝑊) − 1) ∈ ℕ) |
13 | lbfzo0 12375 | . . 3 ⊢ (0 ∈ (0..^((#‘𝑊) − 1)) ↔ ((#‘𝑊) − 1) ∈ ℕ) | |
14 | 12, 13 | sylibr 223 | . 2 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 2 ≤ (#‘𝑊)) → 0 ∈ (0..^((#‘𝑊) − 1))) |
15 | pfxtrcfv 40264 | . 2 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑊 ≠ ∅ ∧ 0 ∈ (0..^((#‘𝑊) − 1))) → ((𝑊 prefix ((#‘𝑊) − 1))‘0) = (𝑊‘0)) | |
16 | 1, 2, 14, 15 | syl3anc 1318 | 1 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 2 ≤ (#‘𝑊)) → ((𝑊 prefix ((#‘𝑊) − 1))‘0) = (𝑊‘0)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 383 = wceq 1475 ∈ wcel 1977 ≠ wne 2780 ∅c0 3874 class class class wbr 4583 ‘cfv 5804 (class class class)co 6549 0cc0 9815 1c1 9816 ≤ cle 9954 − cmin 10145 ℕcn 10897 2c2 10947 ℤcz 11254 ℤ≥cuz 11563 ..^cfzo 12334 #chash 12979 Word cword 13146 prefix cpfx 40244 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-rep 4699 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 ax-un 6847 ax-cnex 9871 ax-resscn 9872 ax-1cn 9873 ax-icn 9874 ax-addcl 9875 ax-addrcl 9876 ax-mulcl 9877 ax-mulrcl 9878 ax-mulcom 9879 ax-addass 9880 ax-mulass 9881 ax-distr 9882 ax-i2m1 9883 ax-1ne0 9884 ax-1rid 9885 ax-rnegex 9886 ax-rrecex 9887 ax-cnre 9888 ax-pre-lttri 9889 ax-pre-lttrn 9890 ax-pre-ltadd 9891 ax-pre-mulgt0 9892 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-nel 2783 df-ral 2901 df-rex 2902 df-reu 2903 df-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-pss 3556 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-tp 4130 df-op 4132 df-uni 4373 df-int 4411 df-iun 4457 df-br 4584 df-opab 4644 df-mpt 4645 df-tr 4681 df-eprel 4949 df-id 4953 df-po 4959 df-so 4960 df-fr 4997 df-we 4999 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-pred 5597 df-ord 5643 df-on 5644 df-lim 5645 df-suc 5646 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-f1 5809 df-fo 5810 df-f1o 5811 df-fv 5812 df-riota 6511 df-ov 6552 df-oprab 6553 df-mpt2 6554 df-om 6958 df-1st 7059 df-2nd 7060 df-wrecs 7294 df-recs 7355 df-rdg 7393 df-1o 7447 df-oadd 7451 df-er 7629 df-en 7842 df-dom 7843 df-sdom 7844 df-fin 7845 df-card 8648 df-pnf 9955 df-mnf 9956 df-xr 9957 df-ltxr 9958 df-le 9959 df-sub 10147 df-neg 10148 df-nn 10898 df-2 10956 df-n0 11170 df-xnn0 11241 df-z 11255 df-uz 11564 df-fz 12198 df-fzo 12335 df-hash 12980 df-word 13154 df-substr 13158 df-pfx 40245 |
This theorem is referenced by: (None) |
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