Theorem reuccats1lem 13479

Description: Lemma for reuccats1 13480. (Contributed by Alexander van der Vekens, 5-Oct-2018.) (Proof shortened by AV, 15-Jan-2020.)

Assertion

Ref	Expression
reuccats1lem	⊢ (((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋 ∧ (𝑊 ++ ⟨“𝑆”⟩) ∈ 𝑋) ∧ (∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) ∧ ∀𝑥 ∈ 𝑋 (𝑥 ∈ Word 𝑉 ∧ (#‘𝑥) = ((#‘𝑊) + 1)))) → (𝑊 = (𝑈 substr ⟨0, (#‘𝑊)⟩) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩)))

Distinct variable groups:   𝑆,𝑠   𝑥,𝑈   𝑉,𝑠,𝑥   𝑊,𝑠,𝑥   𝑋,𝑠,𝑥

Allowed substitution hints:   𝑆(𝑥)   𝑈(𝑠)

Proof of Theorem reuccats1lem

Dummy variable 𝑢 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		eleq1 2689	. . . . . . . . 9 ⊢ (𝑥 = 𝑈 → (𝑥 ∈ Word 𝑉 ↔ 𝑈 ∈ Word 𝑉))
2		fveq2 6191	. . . . . . . . . 10 ⊢ (𝑥 = 𝑈 → (#‘𝑥) = (#‘𝑈))
3	2	eqeq1d 2624	. . . . . . . . 9 ⊢ (𝑥 = 𝑈 → ((#‘𝑥) = ((#‘𝑊) + 1) ↔ (#‘𝑈) = ((#‘𝑊) + 1)))
4	1, 3	anbi12d 747	. . . . . . . 8 ⊢ (𝑥 = 𝑈 → ((𝑥 ∈ Word 𝑉 ∧ (#‘𝑥) = ((#‘𝑊) + 1)) ↔ (𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1))))
5	4	rspcv 3305	. . . . . . 7 ⊢ (𝑈 ∈ 𝑋 → (∀𝑥 ∈ 𝑋 (𝑥 ∈ Word 𝑉 ∧ (#‘𝑥) = ((#‘𝑊) + 1)) → (𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1))))
6	5	adantl 482	. . . . . 6 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) → (∀𝑥 ∈ 𝑋 (𝑥 ∈ Word 𝑉 ∧ (#‘𝑥) = ((#‘𝑊) + 1)) → (𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1))))
7		simpl 473	. . . . . . . . . . 11 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) → 𝑊 ∈ Word 𝑉)
8	7	adantr 481	. . . . . . . . . 10 ⊢ (((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) ∧ (𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1))) → 𝑊 ∈ Word 𝑉)
9		simpl 473	. . . . . . . . . . 11 ⊢ ((𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1)) → 𝑈 ∈ Word 𝑉)
10	9	adantl 482	. . . . . . . . . 10 ⊢ (((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) ∧ (𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1))) → 𝑈 ∈ Word 𝑉)
11		simprr 796	. . . . . . . . . 10 ⊢ (((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) ∧ (𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1))) → (#‘𝑈) = ((#‘𝑊) + 1))
12		ccats1swrdeqrex 13478	. . . . . . . . . 10 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1)) → (𝑊 = (𝑈 substr ⟨0, (#‘𝑊)⟩) → ∃𝑢 ∈ 𝑉 𝑈 = (𝑊 ++ ⟨“𝑢”⟩)))
13	8, 10, 11, 12	syl3anc 1326	. . . . . . . . 9 ⊢ (((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) ∧ (𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1))) → (𝑊 = (𝑈 substr ⟨0, (#‘𝑊)⟩) → ∃𝑢 ∈ 𝑉 𝑈 = (𝑊 ++ ⟨“𝑢”⟩)))
14		s1eq 13380	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑠 = 𝑢 → ⟨“𝑠”⟩ = ⟨“𝑢”⟩)
15	14	oveq2d 6666	. . . . . . . . . . . . . . . . 17 ⊢ (𝑠 = 𝑢 → (𝑊 ++ ⟨“𝑠”⟩) = (𝑊 ++ ⟨“𝑢”⟩))
16	15	eleq1d 2686	. . . . . . . . . . . . . . . 16 ⊢ (𝑠 = 𝑢 → ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 ↔ (𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋))
17		eqeq2 2633	. . . . . . . . . . . . . . . 16 ⊢ (𝑠 = 𝑢 → (𝑆 = 𝑠 ↔ 𝑆 = 𝑢))
18	16, 17	imbi12d 334	. . . . . . . . . . . . . . 15 ⊢ (𝑠 = 𝑢 → (((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) ↔ ((𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋 → 𝑆 = 𝑢)))
19	18	rspcv 3305	. . . . . . . . . . . . . 14 ⊢ (𝑢 ∈ 𝑉 → (∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) → ((𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋 → 𝑆 = 𝑢)))
20		eleq1 2689	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → (𝑈 ∈ 𝑋 ↔ (𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋))
21	20	biimpac 503	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑈 ∈ 𝑋 ∧ 𝑈 = (𝑊 ++ ⟨“𝑢”⟩)) → (𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋)
22		s1eq 13380	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (𝑢 = 𝑆 → ⟨“𝑢”⟩ = ⟨“𝑆”⟩)
23	22	eqcoms 2630	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝑆 = 𝑢 → ⟨“𝑢”⟩ = ⟨“𝑆”⟩)
24	23	oveq2d 6666	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑆 = 𝑢 → (𝑊 ++ ⟨“𝑢”⟩) = (𝑊 ++ ⟨“𝑆”⟩))
25	24	eqeq2d 2632	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑆 = 𝑢 → (𝑈 = (𝑊 ++ ⟨“𝑢”⟩) ↔ 𝑈 = (𝑊 ++ ⟨“𝑆”⟩)))
26	25	biimpd 219	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑆 = 𝑢 → (𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩)))
27	26	imim2i 16	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋 → 𝑆 = 𝑢) → ((𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋 → (𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
28	27	com13 88	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → ((𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋 → (((𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋 → 𝑆 = 𝑢) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
29	28	adantl 482	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑈 ∈ 𝑋 ∧ 𝑈 = (𝑊 ++ ⟨“𝑢”⟩)) → ((𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋 → (((𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋 → 𝑆 = 𝑢) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
30	21, 29	mpd 15	. . . . . . . . . . . . . . . 16 ⊢ ((𝑈 ∈ 𝑋 ∧ 𝑈 = (𝑊 ++ ⟨“𝑢”⟩)) → (((𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋 → 𝑆 = 𝑢) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩)))
31	30	ex 450	. . . . . . . . . . . . . . 15 ⊢ (𝑈 ∈ 𝑋 → (𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → (((𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋 → 𝑆 = 𝑢) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
32	31	com23 86	. . . . . . . . . . . . . 14 ⊢ (𝑈 ∈ 𝑋 → (((𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋 → 𝑆 = 𝑢) → (𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
33	19, 32	sylan9r 690	. . . . . . . . . . . . 13 ⊢ ((𝑈 ∈ 𝑋 ∧ 𝑢 ∈ 𝑉) → (∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) → (𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
34	33	com23 86	. . . . . . . . . . . 12 ⊢ ((𝑈 ∈ 𝑋 ∧ 𝑢 ∈ 𝑉) → (𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → (∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
35	34	rexlimdva 3031	. . . . . . . . . . 11 ⊢ (𝑈 ∈ 𝑋 → (∃𝑢 ∈ 𝑉 𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → (∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
36	35	adantl 482	. . . . . . . . . 10 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) → (∃𝑢 ∈ 𝑉 𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → (∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
37	36	adantr 481	. . . . . . . . 9 ⊢ (((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) ∧ (𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1))) → (∃𝑢 ∈ 𝑉 𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → (∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
38	13, 37	syld 47	. . . . . . . 8 ⊢ (((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) ∧ (𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1))) → (𝑊 = (𝑈 substr ⟨0, (#‘𝑊)⟩) → (∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
39	38	com23 86	. . . . . . 7 ⊢ (((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) ∧ (𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1))) → (∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) → (𝑊 = (𝑈 substr ⟨0, (#‘𝑊)⟩) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
40	39	ex 450	. . . . . 6 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) → ((𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1)) → (∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) → (𝑊 = (𝑈 substr ⟨0, (#‘𝑊)⟩) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩)))))
41	6, 40	syld 47	. . . . 5 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) → (∀𝑥 ∈ 𝑋 (𝑥 ∈ Word 𝑉 ∧ (#‘𝑥) = ((#‘𝑊) + 1)) → (∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) → (𝑊 = (𝑈 substr ⟨0, (#‘𝑊)⟩) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩)))))
42	41	com23 86	. . . 4 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) → (∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) → (∀𝑥 ∈ 𝑋 (𝑥 ∈ Word 𝑉 ∧ (#‘𝑥) = ((#‘𝑊) + 1)) → (𝑊 = (𝑈 substr ⟨0, (#‘𝑊)⟩) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩)))))
43	42	impd 447	. . 3 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) → ((∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) ∧ ∀𝑥 ∈ 𝑋 (𝑥 ∈ Word 𝑉 ∧ (#‘𝑥) = ((#‘𝑊) + 1))) → (𝑊 = (𝑈 substr ⟨0, (#‘𝑊)⟩) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
44	43	3adant3 1081	. 2 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋 ∧ (𝑊 ++ ⟨“𝑆”⟩) ∈ 𝑋) → ((∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) ∧ ∀𝑥 ∈ 𝑋 (𝑥 ∈ Word 𝑉 ∧ (#‘𝑥) = ((#‘𝑊) + 1))) → (𝑊 = (𝑈 substr ⟨0, (#‘𝑊)⟩) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
45	44	imp 445	1 ⊢ (((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋 ∧ (𝑊 ++ ⟨“𝑆”⟩) ∈ 𝑋) ∧ (∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) ∧ ∀𝑥 ∈ 𝑋 (𝑥 ∈ Word 𝑉 ∧ (#‘𝑥) = ((#‘𝑊) + 1)))) → (𝑊 = (𝑈 substr ⟨0, (#‘𝑊)⟩) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩)))

Syntax hints:   → wi 4   ∧ wa 384   ∧ w3a 1037   = wceq 1483   ∈ wcel 1990  ∀wral 2912  ∃wrex 2913  ⟨cop 4183  ‘cfv 5888  (class class class)co 6650  0cc0 9936  1c1 9937   + caddc 9939  #chash 13117  Word cword 13291   ++ cconcat 13293  ⟨“cs1 13294   substr csubstr 13295

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-oadd 7564  df-er 7742  df-en 7956  df-dom 7957  df-sdom 7958  df-fin 7959  df-card 8765  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-nn 11021  df-n0 11293  df-xnn0 11364  df-z 11378  df-uz 11688  df-fz 12327  df-fzo 12466  df-hash 13118  df-word 13299  df-lsw 13300  df-concat 13301  df-s1 13302  df-substr 13303

This theorem is referenced by:  reuccats1  13480