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Mirrors > Home > MPE Home > Th. List > ccatval21sw | Structured version Visualization version GIF version |
Description: The first symbol of the right (nonempty) half of a concatenated word. (Contributed by AV, 23-Apr-2022.) |
Ref | Expression |
---|---|
ccatval21sw | ⊢ ((𝐴 ∈ Word 𝑉 ∧ 𝐵 ∈ Word 𝑉 ∧ 𝐵 ≠ ∅) → ((𝐴 ++ 𝐵)‘(♯‘𝐴)) = (𝐵‘0)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | lencl 14164 | . . . . . . 7 ⊢ (𝐴 ∈ Word 𝑉 → (♯‘𝐴) ∈ ℕ0) | |
2 | 1 | nn0zd 12353 | . . . . . 6 ⊢ (𝐴 ∈ Word 𝑉 → (♯‘𝐴) ∈ ℤ) |
3 | lennncl 14165 | . . . . . 6 ⊢ ((𝐵 ∈ Word 𝑉 ∧ 𝐵 ≠ ∅) → (♯‘𝐵) ∈ ℕ) | |
4 | simpl 482 | . . . . . . 7 ⊢ (((♯‘𝐴) ∈ ℤ ∧ (♯‘𝐵) ∈ ℕ) → (♯‘𝐴) ∈ ℤ) | |
5 | nnz 12272 | . . . . . . . 8 ⊢ ((♯‘𝐵) ∈ ℕ → (♯‘𝐵) ∈ ℤ) | |
6 | zaddcl 12290 | . . . . . . . 8 ⊢ (((♯‘𝐴) ∈ ℤ ∧ (♯‘𝐵) ∈ ℤ) → ((♯‘𝐴) + (♯‘𝐵)) ∈ ℤ) | |
7 | 5, 6 | sylan2 592 | . . . . . . 7 ⊢ (((♯‘𝐴) ∈ ℤ ∧ (♯‘𝐵) ∈ ℕ) → ((♯‘𝐴) + (♯‘𝐵)) ∈ ℤ) |
8 | nngt0 11934 | . . . . . . . . 9 ⊢ ((♯‘𝐵) ∈ ℕ → 0 < (♯‘𝐵)) | |
9 | 8 | adantl 481 | . . . . . . . 8 ⊢ (((♯‘𝐴) ∈ ℤ ∧ (♯‘𝐵) ∈ ℕ) → 0 < (♯‘𝐵)) |
10 | nnre 11910 | . . . . . . . . 9 ⊢ ((♯‘𝐵) ∈ ℕ → (♯‘𝐵) ∈ ℝ) | |
11 | zre 12253 | . . . . . . . . 9 ⊢ ((♯‘𝐴) ∈ ℤ → (♯‘𝐴) ∈ ℝ) | |
12 | ltaddpos 11395 | . . . . . . . . 9 ⊢ (((♯‘𝐵) ∈ ℝ ∧ (♯‘𝐴) ∈ ℝ) → (0 < (♯‘𝐵) ↔ (♯‘𝐴) < ((♯‘𝐴) + (♯‘𝐵)))) | |
13 | 10, 11, 12 | syl2anr 596 | . . . . . . . 8 ⊢ (((♯‘𝐴) ∈ ℤ ∧ (♯‘𝐵) ∈ ℕ) → (0 < (♯‘𝐵) ↔ (♯‘𝐴) < ((♯‘𝐴) + (♯‘𝐵)))) |
14 | 9, 13 | mpbid 231 | . . . . . . 7 ⊢ (((♯‘𝐴) ∈ ℤ ∧ (♯‘𝐵) ∈ ℕ) → (♯‘𝐴) < ((♯‘𝐴) + (♯‘𝐵))) |
15 | 4, 7, 14 | 3jca 1126 | . . . . . 6 ⊢ (((♯‘𝐴) ∈ ℤ ∧ (♯‘𝐵) ∈ ℕ) → ((♯‘𝐴) ∈ ℤ ∧ ((♯‘𝐴) + (♯‘𝐵)) ∈ ℤ ∧ (♯‘𝐴) < ((♯‘𝐴) + (♯‘𝐵)))) |
16 | 2, 3, 15 | syl2an 595 | . . . . 5 ⊢ ((𝐴 ∈ Word 𝑉 ∧ (𝐵 ∈ Word 𝑉 ∧ 𝐵 ≠ ∅)) → ((♯‘𝐴) ∈ ℤ ∧ ((♯‘𝐴) + (♯‘𝐵)) ∈ ℤ ∧ (♯‘𝐴) < ((♯‘𝐴) + (♯‘𝐵)))) |
17 | 16 | 3impb 1113 | . . . 4 ⊢ ((𝐴 ∈ Word 𝑉 ∧ 𝐵 ∈ Word 𝑉 ∧ 𝐵 ≠ ∅) → ((♯‘𝐴) ∈ ℤ ∧ ((♯‘𝐴) + (♯‘𝐵)) ∈ ℤ ∧ (♯‘𝐴) < ((♯‘𝐴) + (♯‘𝐵)))) |
18 | fzolb 13322 | . . . 4 ⊢ ((♯‘𝐴) ∈ ((♯‘𝐴)..^((♯‘𝐴) + (♯‘𝐵))) ↔ ((♯‘𝐴) ∈ ℤ ∧ ((♯‘𝐴) + (♯‘𝐵)) ∈ ℤ ∧ (♯‘𝐴) < ((♯‘𝐴) + (♯‘𝐵)))) | |
19 | 17, 18 | sylibr 233 | . . 3 ⊢ ((𝐴 ∈ Word 𝑉 ∧ 𝐵 ∈ Word 𝑉 ∧ 𝐵 ≠ ∅) → (♯‘𝐴) ∈ ((♯‘𝐴)..^((♯‘𝐴) + (♯‘𝐵)))) |
20 | ccatval2 14211 | . . 3 ⊢ ((𝐴 ∈ Word 𝑉 ∧ 𝐵 ∈ Word 𝑉 ∧ (♯‘𝐴) ∈ ((♯‘𝐴)..^((♯‘𝐴) + (♯‘𝐵)))) → ((𝐴 ++ 𝐵)‘(♯‘𝐴)) = (𝐵‘((♯‘𝐴) − (♯‘𝐴)))) | |
21 | 19, 20 | syld3an3 1407 | . 2 ⊢ ((𝐴 ∈ Word 𝑉 ∧ 𝐵 ∈ Word 𝑉 ∧ 𝐵 ≠ ∅) → ((𝐴 ++ 𝐵)‘(♯‘𝐴)) = (𝐵‘((♯‘𝐴) − (♯‘𝐴)))) |
22 | 1 | nn0cnd 12225 | . . . . 5 ⊢ (𝐴 ∈ Word 𝑉 → (♯‘𝐴) ∈ ℂ) |
23 | 22 | subidd 11250 | . . . 4 ⊢ (𝐴 ∈ Word 𝑉 → ((♯‘𝐴) − (♯‘𝐴)) = 0) |
24 | 23 | fveq2d 6760 | . . 3 ⊢ (𝐴 ∈ Word 𝑉 → (𝐵‘((♯‘𝐴) − (♯‘𝐴))) = (𝐵‘0)) |
25 | 24 | 3ad2ant1 1131 | . 2 ⊢ ((𝐴 ∈ Word 𝑉 ∧ 𝐵 ∈ Word 𝑉 ∧ 𝐵 ≠ ∅) → (𝐵‘((♯‘𝐴) − (♯‘𝐴))) = (𝐵‘0)) |
26 | 21, 25 | eqtrd 2778 | 1 ⊢ ((𝐴 ∈ Word 𝑉 ∧ 𝐵 ∈ Word 𝑉 ∧ 𝐵 ≠ ∅) → ((𝐴 ++ 𝐵)‘(♯‘𝐴)) = (𝐵‘0)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1085 = wceq 1539 ∈ wcel 2108 ≠ wne 2942 ∅c0 4253 class class class wbr 5070 ‘cfv 6418 (class class class)co 7255 ℝcr 10801 0cc0 10802 + caddc 10805 < clt 10940 − cmin 11135 ℕcn 11903 ℤcz 12249 ..^cfzo 13311 ♯chash 13972 Word cword 14145 ++ cconcat 14201 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-rep 5205 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-int 4877 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-om 7688 df-1st 7804 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-1o 8267 df-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 df-fin 8695 df-card 9628 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-nn 11904 df-n0 12164 df-z 12250 df-uz 12512 df-fz 13169 df-fzo 13312 df-hash 13973 df-word 14146 df-concat 14202 |
This theorem is referenced by: clwwlkccatlem 28254 |
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