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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 14236 | . . . . . . 7 ⊢ (𝐴 ∈ Word 𝑉 → (♯‘𝐴) ∈ ℕ0) | |
2 | 1 | nn0zd 12424 | . . . . . 6 ⊢ (𝐴 ∈ Word 𝑉 → (♯‘𝐴) ∈ ℤ) |
3 | lennncl 14237 | . . . . . 6 ⊢ ((𝐵 ∈ Word 𝑉 ∧ 𝐵 ≠ ∅) → (♯‘𝐵) ∈ ℕ) | |
4 | simpl 483 | . . . . . . 7 ⊢ (((♯‘𝐴) ∈ ℤ ∧ (♯‘𝐵) ∈ ℕ) → (♯‘𝐴) ∈ ℤ) | |
5 | nnz 12342 | . . . . . . . 8 ⊢ ((♯‘𝐵) ∈ ℕ → (♯‘𝐵) ∈ ℤ) | |
6 | zaddcl 12360 | . . . . . . . 8 ⊢ (((♯‘𝐴) ∈ ℤ ∧ (♯‘𝐵) ∈ ℤ) → ((♯‘𝐴) + (♯‘𝐵)) ∈ ℤ) | |
7 | 5, 6 | sylan2 593 | . . . . . . 7 ⊢ (((♯‘𝐴) ∈ ℤ ∧ (♯‘𝐵) ∈ ℕ) → ((♯‘𝐴) + (♯‘𝐵)) ∈ ℤ) |
8 | nngt0 12004 | . . . . . . . . 9 ⊢ ((♯‘𝐵) ∈ ℕ → 0 < (♯‘𝐵)) | |
9 | 8 | adantl 482 | . . . . . . . 8 ⊢ (((♯‘𝐴) ∈ ℤ ∧ (♯‘𝐵) ∈ ℕ) → 0 < (♯‘𝐵)) |
10 | nnre 11980 | . . . . . . . . 9 ⊢ ((♯‘𝐵) ∈ ℕ → (♯‘𝐵) ∈ ℝ) | |
11 | zre 12323 | . . . . . . . . 9 ⊢ ((♯‘𝐴) ∈ ℤ → (♯‘𝐴) ∈ ℝ) | |
12 | ltaddpos 11465 | . . . . . . . . 9 ⊢ (((♯‘𝐵) ∈ ℝ ∧ (♯‘𝐴) ∈ ℝ) → (0 < (♯‘𝐵) ↔ (♯‘𝐴) < ((♯‘𝐴) + (♯‘𝐵)))) | |
13 | 10, 11, 12 | syl2anr 597 | . . . . . . . 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 1127 | . . . . . 6 ⊢ (((♯‘𝐴) ∈ ℤ ∧ (♯‘𝐵) ∈ ℕ) → ((♯‘𝐴) ∈ ℤ ∧ ((♯‘𝐴) + (♯‘𝐵)) ∈ ℤ ∧ (♯‘𝐴) < ((♯‘𝐴) + (♯‘𝐵)))) |
16 | 2, 3, 15 | syl2an 596 | . . . . 5 ⊢ ((𝐴 ∈ Word 𝑉 ∧ (𝐵 ∈ Word 𝑉 ∧ 𝐵 ≠ ∅)) → ((♯‘𝐴) ∈ ℤ ∧ ((♯‘𝐴) + (♯‘𝐵)) ∈ ℤ ∧ (♯‘𝐴) < ((♯‘𝐴) + (♯‘𝐵)))) |
17 | 16 | 3impb 1114 | . . . 4 ⊢ ((𝐴 ∈ Word 𝑉 ∧ 𝐵 ∈ Word 𝑉 ∧ 𝐵 ≠ ∅) → ((♯‘𝐴) ∈ ℤ ∧ ((♯‘𝐴) + (♯‘𝐵)) ∈ ℤ ∧ (♯‘𝐴) < ((♯‘𝐴) + (♯‘𝐵)))) |
18 | fzolb 13393 | . . . 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 14283 | . . 3 ⊢ ((𝐴 ∈ Word 𝑉 ∧ 𝐵 ∈ Word 𝑉 ∧ (♯‘𝐴) ∈ ((♯‘𝐴)..^((♯‘𝐴) + (♯‘𝐵)))) → ((𝐴 ++ 𝐵)‘(♯‘𝐴)) = (𝐵‘((♯‘𝐴) − (♯‘𝐴)))) | |
21 | 19, 20 | syld3an3 1408 | . 2 ⊢ ((𝐴 ∈ Word 𝑉 ∧ 𝐵 ∈ Word 𝑉 ∧ 𝐵 ≠ ∅) → ((𝐴 ++ 𝐵)‘(♯‘𝐴)) = (𝐵‘((♯‘𝐴) − (♯‘𝐴)))) |
22 | 1 | nn0cnd 12295 | . . . . 5 ⊢ (𝐴 ∈ Word 𝑉 → (♯‘𝐴) ∈ ℂ) |
23 | 22 | subidd 11320 | . . . 4 ⊢ (𝐴 ∈ Word 𝑉 → ((♯‘𝐴) − (♯‘𝐴)) = 0) |
24 | 23 | fveq2d 6778 | . . 3 ⊢ (𝐴 ∈ Word 𝑉 → (𝐵‘((♯‘𝐴) − (♯‘𝐴))) = (𝐵‘0)) |
25 | 24 | 3ad2ant1 1132 | . 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 396 ∧ w3a 1086 = wceq 1539 ∈ wcel 2106 ≠ wne 2943 ∅c0 4256 class class class wbr 5074 ‘cfv 6433 (class class class)co 7275 ℝcr 10870 0cc0 10871 + caddc 10874 < clt 11009 − cmin 11205 ℕcn 11973 ℤcz 12319 ..^cfzo 13382 ♯chash 14044 Word cword 14217 ++ cconcat 14273 |
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 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-rep 5209 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 ax-cnex 10927 ax-resscn 10928 ax-1cn 10929 ax-icn 10930 ax-addcl 10931 ax-addrcl 10932 ax-mulcl 10933 ax-mulrcl 10934 ax-mulcom 10935 ax-addass 10936 ax-mulass 10937 ax-distr 10938 ax-i2m1 10939 ax-1ne0 10940 ax-1rid 10941 ax-rnegex 10942 ax-rrecex 10943 ax-cnre 10944 ax-pre-lttri 10945 ax-pre-lttrn 10946 ax-pre-ltadd 10947 ax-pre-mulgt0 10948 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-pss 3906 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-int 4880 df-iun 4926 df-br 5075 df-opab 5137 df-mpt 5158 df-tr 5192 df-id 5489 df-eprel 5495 df-po 5503 df-so 5504 df-fr 5544 df-we 5546 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-pred 6202 df-ord 6269 df-on 6270 df-lim 6271 df-suc 6272 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-riota 7232 df-ov 7278 df-oprab 7279 df-mpo 7280 df-om 7713 df-1st 7831 df-2nd 7832 df-frecs 8097 df-wrecs 8128 df-recs 8202 df-rdg 8241 df-1o 8297 df-er 8498 df-en 8734 df-dom 8735 df-sdom 8736 df-fin 8737 df-card 9697 df-pnf 11011 df-mnf 11012 df-xr 11013 df-ltxr 11014 df-le 11015 df-sub 11207 df-neg 11208 df-nn 11974 df-n0 12234 df-z 12320 df-uz 12583 df-fz 13240 df-fzo 13383 df-hash 14045 df-word 14218 df-concat 14274 |
This theorem is referenced by: clwwlkccatlem 28353 |
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