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Theorem ccat2s1fvwd 11393

Description: Extract a symbol of a word from the concatenation of the word with two single symbols. (Contributed by AV, 22-Sep-2018.) (Revised by AV, 13-Jan-2020.) (Proof shortened by AV, 1-May-2020.) (Revised by AV, 28-Jan-2024.)

**Hypotheses**
Ref	Expression
ccat2s1fvwd.w	⊢ (𝜑 → 𝑊 ∈ Word 𝑉)
ccat2s1fvwd.i	⊢ (𝜑 → 𝐼 ∈ ℕ₀)
ccat2s1fvwd.1	⊢ (𝜑 → 𝐼 < (♯‘𝑊))
ccat2s1fvwd.x	⊢ (𝜑 → 𝑋 ∈ 𝐴)
ccat2s1fvwd.y	⊢ (𝜑 → 𝑌 ∈ 𝐵)

**Assertion**
Ref	Expression
ccat2s1fvwd	⊢ (𝜑 → (((𝑊 ++ ⟨“𝑋”⟩) ++ ⟨“𝑌”⟩)‘𝐼) = (𝑊‘𝐼))

**Proof of Theorem ccat2s1fvwd**
Step	Hyp	Ref	Expression
1		ccat2s1fvwd.w	. . . . 5 ⊢ (𝜑 → 𝑊 ∈ Word 𝑉)
2		wrdv 11298	. . . . 5 ⊢ (𝑊 ∈ Word 𝑉 → 𝑊 ∈ Word V)
3	1, 2	syl 14	. . . 4 ⊢ (𝜑 → 𝑊 ∈ Word V)
4		ccat2s1fvwd.x	. . . . . 6 ⊢ (𝜑 → 𝑋 ∈ 𝐴)
5	4	elexd 2835	. . . . 5 ⊢ (𝜑 → 𝑋 ∈ V)
6	5	s1cld 11368	. . . 4 ⊢ (𝜑 → ⟨“𝑋”⟩ ∈ Word V)
7		ccat2s1fvwd.y	. . . . . 6 ⊢ (𝜑 → 𝑌 ∈ 𝐵)
8	7	elexd 2835	. . . . 5 ⊢ (𝜑 → 𝑌 ∈ V)
9	8	s1cld 11368	. . . 4 ⊢ (𝜑 → ⟨“𝑌”⟩ ∈ Word V)
10		ccatass 11354	. . . 4 ⊢ ((𝑊 ∈ Word V ∧ ⟨“𝑋”⟩ ∈ Word V ∧ ⟨“𝑌”⟩ ∈ Word V) → ((𝑊 ++ ⟨“𝑋”⟩) ++ ⟨“𝑌”⟩) = (𝑊 ++ (⟨“𝑋”⟩ ++ ⟨“𝑌”⟩)))
11	3, 6, 9, 10	syl3anc 1278	. . 3 ⊢ (𝜑 → ((𝑊 ++ ⟨“𝑋”⟩) ++ ⟨“𝑌”⟩) = (𝑊 ++ (⟨“𝑋”⟩ ++ ⟨“𝑌”⟩)))
12	11	fveq1d 5692	. 2 ⊢ (𝜑 → (((𝑊 ++ ⟨“𝑋”⟩) ++ ⟨“𝑌”⟩)‘𝐼) = ((𝑊 ++ (⟨“𝑋”⟩ ++ ⟨“𝑌”⟩))‘𝐼))
13		ccatws1cl 11378	. . . 4 ⊢ ((⟨“𝑋”⟩ ∈ Word V ∧ 𝑌 ∈ V) → (⟨“𝑋”⟩ ++ ⟨“𝑌”⟩) ∈ Word V)
14	6, 8, 13	syl2anc 415	. . 3 ⊢ (𝜑 → (⟨“𝑋”⟩ ++ ⟨“𝑌”⟩) ∈ Word V)
15		ccat2s1fvwd.i	. . . 4 ⊢ (𝜑 → 𝐼 ∈ ℕ₀)
16		ccat2s1fvwd.1	. . . 4 ⊢ (𝜑 → 𝐼 < (♯‘𝑊))
17		simp2 1029	. . . . 5 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝐼 ∈ ℕ₀ ∧ 𝐼 < (♯‘𝑊)) → 𝐼 ∈ ℕ₀)
18		lencl 11286	. . . . . . 7 ⊢ (𝑊 ∈ Word 𝑉 → (♯‘𝑊) ∈ ℕ₀)
19	18	3ad2ant1 1049	. . . . . 6 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝐼 ∈ ℕ₀ ∧ 𝐼 < (♯‘𝑊)) → (♯‘𝑊) ∈ ℕ₀)
20		nn0ge0 9567	. . . . . . . . 9 ⊢ (𝐼 ∈ ℕ₀ → 0 ≤ 𝐼)
21	20	adantl 277	. . . . . . . 8 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝐼 ∈ ℕ₀) → 0 ≤ 𝐼)
22		0red 8317	. . . . . . . . 9 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝐼 ∈ ℕ₀) → 0 ∈ ℝ)
23		nn0re 9551	. . . . . . . . . 10 ⊢ (𝐼 ∈ ℕ₀ → 𝐼 ∈ ℝ)
24	23	adantl 277	. . . . . . . . 9 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝐼 ∈ ℕ₀) → 𝐼 ∈ ℝ)
25	18	nn0red 9600	. . . . . . . . . 10 ⊢ (𝑊 ∈ Word 𝑉 → (♯‘𝑊) ∈ ℝ)
26	25	adantr 276	. . . . . . . . 9 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝐼 ∈ ℕ₀) → (♯‘𝑊) ∈ ℝ)
27		lelttr 8404	. . . . . . . . 9 ⊢ ((0 ∈ ℝ ∧ 𝐼 ∈ ℝ ∧ (♯‘𝑊) ∈ ℝ) → ((0 ≤ 𝐼 ∧ 𝐼 < (♯‘𝑊)) → 0 < (♯‘𝑊)))
28	22, 24, 26, 27	syl3anc 1278	. . . . . . . 8 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝐼 ∈ ℕ₀) → ((0 ≤ 𝐼 ∧ 𝐼 < (♯‘𝑊)) → 0 < (♯‘𝑊)))
29	21, 28	mpand 433	. . . . . . 7 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝐼 ∈ ℕ₀) → (𝐼 < (♯‘𝑊) → 0 < (♯‘𝑊)))
30	29	3impia 1231	. . . . . 6 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝐼 ∈ ℕ₀ ∧ 𝐼 < (♯‘𝑊)) → 0 < (♯‘𝑊))
31		elnnnn0b 9586	. . . . . 6 ⊢ ((♯‘𝑊) ∈ ℕ ↔ ((♯‘𝑊) ∈ ℕ₀ ∧ 0 < (♯‘𝑊)))
32	19, 30, 31	sylanbrc 421	. . . . 5 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝐼 ∈ ℕ₀ ∧ 𝐼 < (♯‘𝑊)) → (♯‘𝑊) ∈ ℕ)
33		simp3 1030	. . . . 5 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝐼 ∈ ℕ₀ ∧ 𝐼 < (♯‘𝑊)) → 𝐼 < (♯‘𝑊))
34		elfzo0 10571	. . . . 5 ⊢ (𝐼 ∈ (0..^(♯‘𝑊)) ↔ (𝐼 ∈ ℕ₀ ∧ (♯‘𝑊) ∈ ℕ ∧ 𝐼 < (♯‘𝑊)))
35	17, 32, 33, 34	syl3anbrc 1212	. . . 4 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝐼 ∈ ℕ₀ ∧ 𝐼 < (♯‘𝑊)) → 𝐼 ∈ (0..^(♯‘𝑊)))
36	1, 15, 16, 35	syl3anc 1278	. . 3 ⊢ (𝜑 → 𝐼 ∈ (0..^(♯‘𝑊)))
37		ccatval1 11343	. . 3 ⊢ ((𝑊 ∈ Word 𝑉 ∧ (⟨“𝑋”⟩ ++ ⟨“𝑌”⟩) ∈ Word V ∧ 𝐼 ∈ (0..^(♯‘𝑊))) → ((𝑊 ++ (⟨“𝑋”⟩ ++ ⟨“𝑌”⟩))‘𝐼) = (𝑊‘𝐼))
38	1, 14, 36, 37	syl3anc 1278	. 2 ⊢ (𝜑 → ((𝑊 ++ (⟨“𝑋”⟩ ++ ⟨“𝑌”⟩))‘𝐼) = (𝑊‘𝐼))
39	12, 38	eqtrd 2271	1 ⊢ (𝜑 → (((𝑊 ++ ⟨“𝑋”⟩) ++ ⟨“𝑌”⟩)‘𝐼) = (𝑊‘𝐼))

Colors of variables: wff set class

Syntax hints: → wi 4 ∧ wa 104 ∧ w3a 1009 = wceq 1402 ∈ wcel 2209 Vcvv 2821 class class class wbr 4125 ‘cfv 5372 (class class class)co 6075 ℝcr 8168 0cc0 8169 < clt 8350 ≤ cle 8351 ℕcn 9283 ℕ₀cn0 9542 ..^cfzo 10527 ♯chash 11192 Word cword 11282 ++ cconcat 11336 ⟨“cs1 11361

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-coll 4241 ax-sep 4244 ax-nul 4254 ax-pow 4306 ax-pr 4341 ax-un 4573 ax-setind 4679 ax-iinf 4730 ax-cnex 8260 ax-resscn 8261 ax-1cn 8262 ax-1re 8263 ax-icn 8264 ax-addcl 8265 ax-addrcl 8266 ax-mulcl 8267 ax-addcom 8269 ax-addass 8271 ax-distr 8273 ax-i2m1 8274 ax-0lt1 8275 ax-0id 8277 ax-rnegex 8278 ax-cnre 8280 ax-pre-ltirr 8281 ax-pre-ltwlin 8282 ax-pre-lttrn 8283 ax-pre-apti 8284 ax-pre-ltadd 8285

This theorem depends on definitions: df-bi 117 df-dc 847 df-3or 1010 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-if 3636 df-pw 3687 df-sn 3711 df-pr 3712 df-op 3714 df-uni 3931 df-int 3966 df-iun 4009 df-br 4126 df-opab 4188 df-mpt 4189 df-tr 4225 df-id 4433 df-iord 4506 df-on 4508 df-ilim 4509 df-suc 4511 df-iom 4733 df-xp 4775 df-rel 4776 df-cnv 4777 df-co 4778 df-dm 4779 df-rn 4780 df-res 4781 df-ima 4782 df-iota 5332 df-fun 5374 df-fn 5375 df-f 5376 df-f1 5377 df-fo 5378 df-f1o 5379 df-fv 5380 df-riota 6028 df-ov 6078 df-oprab 6079 df-mpo 6080 df-1st 6364 df-2nd 6365 df-recs 6566 df-frec 6652 df-1o 6677 df-er 6797 df-en 7013 df-dom 7014 df-fin 7015 df-pnf 8352 df-mnf 8353 df-xr 8354 df-ltxr 8355 df-le 8356 df-sub 8489 df-neg 8490 df-inn 9284 df-n0 9543 df-z 9624 df-uz 9901 df-fz 10391 df-fzo 10528 df-ihash 11193 df-word 11283 df-concat 11337 df-s1 11362

This theorem is referenced by: ccat2s1fstg 11394 clwwlknonex2lem2 16593

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