Theorem reuccats1lem 13331

Description: Lemma for reuccats1 13332. (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 2676	. . . . . . . . 9 ⊢ (𝑥 = 𝑈 → (𝑥 ∈ Word 𝑉 ↔ 𝑈 ∈ Word 𝑉))
2		fveq2 6103	. . . . . . . . . 10 ⊢ (𝑥 = 𝑈 → (#‘𝑥) = (#‘𝑈))
3	2	eqeq1d 2612	. . . . . . . . 9 ⊢ (𝑥 = 𝑈 → ((#‘𝑥) = ((#‘𝑊) + 1) ↔ (#‘𝑈) = ((#‘𝑊) + 1)))
4	1, 3	anbi12d 743	. . . . . . . 8 ⊢ (𝑥 = 𝑈 → ((𝑥 ∈ Word 𝑉 ∧ (#‘𝑥) = ((#‘𝑊) + 1)) ↔ (𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1))))
5	4	rspcv 3278	. . . . . . 7 ⊢ (𝑈 ∈ 𝑋 → (∀𝑥 ∈ 𝑋 (𝑥 ∈ Word 𝑉 ∧ (#‘𝑥) = ((#‘𝑊) + 1)) → (𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1))))
6	5	adantl 481	. . . . . 6 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) → (∀𝑥 ∈ 𝑋 (𝑥 ∈ Word 𝑉 ∧ (#‘𝑥) = ((#‘𝑊) + 1)) → (𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1))))
7		simpl 472	. . . . . . . . . . 11 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) → 𝑊 ∈ Word 𝑉)
8	7	adantr 480	. . . . . . . . . 10 ⊢ (((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) ∧ (𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1))) → 𝑊 ∈ Word 𝑉)
9		simpl 472	. . . . . . . . . . 11 ⊢ ((𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1)) → 𝑈 ∈ Word 𝑉)
10	9	adantl 481	. . . . . . . . . 10 ⊢ (((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) ∧ (𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1))) → 𝑈 ∈ Word 𝑉)
11		simprr 792	. . . . . . . . . 10 ⊢ (((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) ∧ (𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1))) → (#‘𝑈) = ((#‘𝑊) + 1))
12		ccats1swrdeqrex 13330	. . . . . . . . . 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 1318	. . . . . . . . 9 ⊢ (((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) ∧ (𝑈 ∈ Word 𝑉 ∧ (#‘𝑈) = ((#‘𝑊) + 1))) → (𝑊 = (𝑈 substr ⟨0, (#‘𝑊)⟩) → ∃𝑢 ∈ 𝑉 𝑈 = (𝑊 ++ ⟨“𝑢”⟩)))
14		s1eq 13233	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑠 = 𝑢 → ⟨“𝑠”⟩ = ⟨“𝑢”⟩)
15	14	oveq2d 6565	. . . . . . . . . . . . . . . . 17 ⊢ (𝑠 = 𝑢 → (𝑊 ++ ⟨“𝑠”⟩) = (𝑊 ++ ⟨“𝑢”⟩))
16	15	eleq1d 2672	. . . . . . . . . . . . . . . 16 ⊢ (𝑠 = 𝑢 → ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 ↔ (𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋))
17		eqeq2 2621	. . . . . . . . . . . . . . . 16 ⊢ (𝑠 = 𝑢 → (𝑆 = 𝑠 ↔ 𝑆 = 𝑢))
18	16, 17	imbi12d 333	. . . . . . . . . . . . . . 15 ⊢ (𝑠 = 𝑢 → (((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) ↔ ((𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋 → 𝑆 = 𝑢)))
19	18	rspcv 3278	. . . . . . . . . . . . . 14 ⊢ (𝑢 ∈ 𝑉 → (∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) → ((𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋 → 𝑆 = 𝑢)))
20		eleq1 2676	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → (𝑈 ∈ 𝑋 ↔ (𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋))
21	20	biimpac 502	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑈 ∈ 𝑋 ∧ 𝑈 = (𝑊 ++ ⟨“𝑢”⟩)) → (𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋)
22		s1eq 13233	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (𝑢 = 𝑆 → ⟨“𝑢”⟩ = ⟨“𝑆”⟩)
23	22	eqcoms 2618	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝑆 = 𝑢 → ⟨“𝑢”⟩ = ⟨“𝑆”⟩)
24	23	oveq2d 6565	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑆 = 𝑢 → (𝑊 ++ ⟨“𝑢”⟩) = (𝑊 ++ ⟨“𝑆”⟩))
25	24	eqeq2d 2620	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑆 = 𝑢 → (𝑈 = (𝑊 ++ ⟨“𝑢”⟩) ↔ 𝑈 = (𝑊 ++ ⟨“𝑆”⟩)))
26	25	biimpd 218	. . . . . . . . . . . . . . . . . . . 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 86	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → ((𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋 → (((𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋 → 𝑆 = 𝑢) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
29	28	adantl 481	. . . . . . . . . . . . . . . . 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 449	. . . . . . . . . . . . . . 15 ⊢ (𝑈 ∈ 𝑋 → (𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → (((𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋 → 𝑆 = 𝑢) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
32	31	com23 84	. . . . . . . . . . . . . 14 ⊢ (𝑈 ∈ 𝑋 → (((𝑊 ++ ⟨“𝑢”⟩) ∈ 𝑋 → 𝑆 = 𝑢) → (𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
33	19, 32	sylan9r 688	. . . . . . . . . . . . 13 ⊢ ((𝑈 ∈ 𝑋 ∧ 𝑢 ∈ 𝑉) → (∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) → (𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
34	33	com23 84	. . . . . . . . . . . 12 ⊢ ((𝑈 ∈ 𝑋 ∧ 𝑢 ∈ 𝑉) → (𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → (∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
35	34	rexlimdva 3013	. . . . . . . . . . 11 ⊢ (𝑈 ∈ 𝑋 → (∃𝑢 ∈ 𝑉 𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → (∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
36	35	adantl 481	. . . . . . . . . 10 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑈 ∈ 𝑋) → (∃𝑢 ∈ 𝑉 𝑈 = (𝑊 ++ ⟨“𝑢”⟩) → (∀𝑠 ∈ 𝑉 ((𝑊 ++ ⟨“𝑠”⟩) ∈ 𝑋 → 𝑆 = 𝑠) → 𝑈 = (𝑊 ++ ⟨“𝑆”⟩))))
37	36	adantr 480	. . . . . . . . 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 46	. . . . . . . 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 84	. . . . . . 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 449	. . . . . 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 46	. . . . 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 84	. . . 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 446	. . 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 1074	. 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 444	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 383   ∧ w3a 1031   = wceq 1475   ∈ wcel 1977  ∀wral 2896  ∃wrex 2897  ⟨cop 4131  ‘cfv 5804  (class class class)co 6549  0cc0 9815  1c1 9816   + caddc 9818  #chash 12979  Word cword 13146   ++ cconcat 13148  ⟨“cs1 13149   substr csubstr 13150

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-n0 11170  df-xnn0 11241  df-z 11255  df-uz 11564  df-fz 12198  df-fzo 12335  df-hash 12980  df-word 13154  df-lsw 13155  df-concat 13156  df-s1 13157  df-substr 13158

This theorem is referenced by:  reuccats1  13332