sseqf - Mathbox for Thierry Arnoux

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Theorem sseqf 33391

Description: A strong recursive sequence is a function over the nonnegative integers. (Contributed by Thierry Arnoux, 23-Apr-2019.) (Proof shortened by AV, 7-Mar-2022.)

**Hypotheses**
Ref	Expression
sseqval.1	⊢ (𝜑 → 𝑆 ∈ V)
sseqval.2	⊢ (𝜑 → 𝑀 ∈ Word 𝑆)
sseqval.3	⊢ 𝑊 = (Word 𝑆 ∩ (^◡♯ “ (ℤ_≥‘(♯‘𝑀))))
sseqval.4	⊢ (𝜑 → 𝐹:𝑊⟶𝑆)

**Assertion**
Ref	Expression
sseqf	⊢ (𝜑 → (𝑀seq_str𝐹):ℕ₀⟶𝑆)

Proof of Theorem sseqf Dummy variables 𝑥 𝑦 𝑎 𝑏 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		sseqval.2	. . . 4 ⊢ (𝜑 → 𝑀 ∈ Word 𝑆)
2		wrdf 14469	. . . 4 ⊢ (𝑀 ∈ Word 𝑆 → 𝑀:(0..^(♯‘𝑀))⟶𝑆)
3	1, 2	syl 17	. . 3 ⊢ (𝜑 → 𝑀:(0..^(♯‘𝑀))⟶𝑆)
4		vex 3479	. . . . . . . . 9 ⊢ 𝑤 ∈ V
5	4	a1i 11	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑤 ∈ (𝑊 ∖ {∅})) → 𝑤 ∈ V)
6		fvex 6905	. . . . . . . . 9 ⊢ (𝑥‘((♯‘𝑥) − 1)) ∈ V
7		df-lsw 14513	. . . . . . . . 9 ⊢ lastS = (𝑥 ∈ V ↦ (𝑥‘((♯‘𝑥) − 1)))
8	6, 7	dmmpti 6695	. . . . . . . 8 ⊢ dom lastS = V
9	5, 8	eleqtrrdi 2845	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑤 ∈ (𝑊 ∖ {∅})) → 𝑤 ∈ dom lastS)
10		eldifsn 4791	. . . . . . . . 9 ⊢ (𝑤 ∈ (𝑊 ∖ {∅}) ↔ (𝑤 ∈ 𝑊 ∧ 𝑤 ≠ ∅))
11		sseqval.3	. . . . . . . . . . . 12 ⊢ 𝑊 = (Word 𝑆 ∩ (^◡♯ “ (ℤ_≥‘(♯‘𝑀))))
12		inss1 4229	. . . . . . . . . . . 12 ⊢ (Word 𝑆 ∩ (^◡♯ “ (ℤ_≥‘(♯‘𝑀)))) ⊆ Word 𝑆
13	11, 12	eqsstri 4017	. . . . . . . . . . 11 ⊢ 𝑊 ⊆ Word 𝑆
14	13	sseli 3979	. . . . . . . . . 10 ⊢ (𝑤 ∈ 𝑊 → 𝑤 ∈ Word 𝑆)
15		lswcl 14518	. . . . . . . . . 10 ⊢ ((𝑤 ∈ Word 𝑆 ∧ 𝑤 ≠ ∅) → (lastS‘𝑤) ∈ 𝑆)
16	14, 15	sylan 581	. . . . . . . . 9 ⊢ ((𝑤 ∈ 𝑊 ∧ 𝑤 ≠ ∅) → (lastS‘𝑤) ∈ 𝑆)
17	10, 16	sylbi 216	. . . . . . . 8 ⊢ (𝑤 ∈ (𝑊 ∖ {∅}) → (lastS‘𝑤) ∈ 𝑆)
18	17	adantl 483	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑤 ∈ (𝑊 ∖ {∅})) → (lastS‘𝑤) ∈ 𝑆)
19	9, 18	jca 513	. . . . . 6 ⊢ ((𝜑 ∧ 𝑤 ∈ (𝑊 ∖ {∅})) → (𝑤 ∈ dom lastS ∧ (lastS‘𝑤) ∈ 𝑆))
20	19	ralrimiva 3147	. . . . 5 ⊢ (𝜑 → ∀𝑤 ∈ (𝑊 ∖ {∅})(𝑤 ∈ dom lastS ∧ (lastS‘𝑤) ∈ 𝑆))
21	6, 7	fnmpti 6694	. . . . . 6 ⊢ lastS Fn V
22		fnfun 6650	. . . . . 6 ⊢ (lastS Fn V → Fun lastS)
23		ffvresb 7124	. . . . . 6 ⊢ (Fun lastS → ((lastS ↾ (𝑊 ∖ {∅})):(𝑊 ∖ {∅})⟶𝑆 ↔ ∀𝑤 ∈ (𝑊 ∖ {∅})(𝑤 ∈ dom lastS ∧ (lastS‘𝑤) ∈ 𝑆)))
24	21, 22, 23	mp2b 10	. . . . 5 ⊢ ((lastS ↾ (𝑊 ∖ {∅})):(𝑊 ∖ {∅})⟶𝑆 ↔ ∀𝑤 ∈ (𝑊 ∖ {∅})(𝑤 ∈ dom lastS ∧ (lastS‘𝑤) ∈ 𝑆))
25	20, 24	sylibr 233	. . . 4 ⊢ (𝜑 → (lastS ↾ (𝑊 ∖ {∅})):(𝑊 ∖ {∅})⟶𝑆)
26		eqid 2733	. . . . 5 ⊢ (ℤ_≥‘(♯‘𝑀)) = (ℤ_≥‘(♯‘𝑀))
27		lencl 14483	. . . . . . 7 ⊢ (𝑀 ∈ Word 𝑆 → (♯‘𝑀) ∈ ℕ₀)
28	27	nn0zd 12584	. . . . . 6 ⊢ (𝑀 ∈ Word 𝑆 → (♯‘𝑀) ∈ ℤ)
29	1, 28	syl 17	. . . . 5 ⊢ (𝜑 → (♯‘𝑀) ∈ ℤ)
30		ovex 7442	. . . . . . 7 ⊢ (𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ∈ V
31		simpr 486	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑎 ∈ (ℤ_≥‘(♯‘𝑀))) → 𝑎 ∈ (ℤ_≥‘(♯‘𝑀)))
32	1, 27	syl 17	. . . . . . . . . . 11 ⊢ (𝜑 → (♯‘𝑀) ∈ ℕ₀)
33	32	adantr 482	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑎 ∈ (ℤ_≥‘(♯‘𝑀))) → (♯‘𝑀) ∈ ℕ₀)
34		elnn0uz 12867	. . . . . . . . . 10 ⊢ ((♯‘𝑀) ∈ ℕ₀ ↔ (♯‘𝑀) ∈ (ℤ_≥‘0))
35	33, 34	sylib 217	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑎 ∈ (ℤ_≥‘(♯‘𝑀))) → (♯‘𝑀) ∈ (ℤ_≥‘0))
36		uztrn 12840	. . . . . . . . 9 ⊢ ((𝑎 ∈ (ℤ_≥‘(♯‘𝑀)) ∧ (♯‘𝑀) ∈ (ℤ_≥‘0)) → 𝑎 ∈ (ℤ_≥‘0))
37	31, 35, 36	syl2anc 585	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑎 ∈ (ℤ_≥‘(♯‘𝑀))) → 𝑎 ∈ (ℤ_≥‘0))
38		nn0uz 12864	. . . . . . . 8 ⊢ ℕ₀ = (ℤ_≥‘0)
39	37, 38	eleqtrrdi 2845	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑎 ∈ (ℤ_≥‘(♯‘𝑀))) → 𝑎 ∈ ℕ₀)
40		fvconst2g 7203	. . . . . . 7 ⊢ (((𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ∈ V ∧ 𝑎 ∈ ℕ₀) → ((ℕ₀ × {(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)})‘𝑎) = (𝑀 ++ ⟨“(𝐹‘𝑀)”⟩))
41	30, 39, 40	sylancr 588	. . . . . 6 ⊢ ((𝜑 ∧ 𝑎 ∈ (ℤ_≥‘(♯‘𝑀))) → ((ℕ₀ × {(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)})‘𝑎) = (𝑀 ++ ⟨“(𝐹‘𝑀)”⟩))
42		sseqval.4	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐹:𝑊⟶𝑆)
43		sseqval.1	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝑆 ∈ V)
44	43, 1, 11, 42	sseqmw 33390	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑀 ∈ 𝑊)
45	42, 44	ffvelcdmd 7088	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐹‘𝑀) ∈ 𝑆)
46	45	s1cld 14553	. . . . . . . . . . 11 ⊢ (𝜑 → ⟨“(𝐹‘𝑀)”⟩ ∈ Word 𝑆)
47		ccatcl 14524	. . . . . . . . . . 11 ⊢ ((𝑀 ∈ Word 𝑆 ∧ ⟨“(𝐹‘𝑀)”⟩ ∈ Word 𝑆) → (𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ∈ Word 𝑆)
48	1, 46, 47	syl2anc 585	. . . . . . . . . 10 ⊢ (𝜑 → (𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ∈ Word 𝑆)
49	30	a1i 11	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ∈ V)
50		ccatws1len 14570	. . . . . . . . . . . . 13 ⊢ (𝑀 ∈ Word 𝑆 → (♯‘(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)) = ((♯‘𝑀) + 1))
51	1, 50	syl 17	. . . . . . . . . . . 12 ⊢ (𝜑 → (♯‘(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)) = ((♯‘𝑀) + 1))
52		uzid 12837	. . . . . . . . . . . . 13 ⊢ ((♯‘𝑀) ∈ ℤ → (♯‘𝑀) ∈ (ℤ_≥‘(♯‘𝑀)))
53		peano2uz 12885	. . . . . . . . . . . . 13 ⊢ ((♯‘𝑀) ∈ (ℤ_≥‘(♯‘𝑀)) → ((♯‘𝑀) + 1) ∈ (ℤ_≥‘(♯‘𝑀)))
54	29, 52, 53	3syl 18	. . . . . . . . . . . 12 ⊢ (𝜑 → ((♯‘𝑀) + 1) ∈ (ℤ_≥‘(♯‘𝑀)))
55	51, 54	eqeltrd 2834	. . . . . . . . . . 11 ⊢ (𝜑 → (♯‘(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)) ∈ (ℤ_≥‘(♯‘𝑀)))
56		hashf 14298	. . . . . . . . . . . 12 ⊢ ♯:V⟶(ℕ₀ ∪ {+∞})
57		ffn 6718	. . . . . . . . . . . 12 ⊢ (♯:V⟶(ℕ₀ ∪ {+∞}) → ♯ Fn V)
58		elpreima 7060	. . . . . . . . . . . 12 ⊢ (♯ Fn V → ((𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ∈ (^◡♯ “ (ℤ_≥‘(♯‘𝑀))) ↔ ((𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ∈ V ∧ (♯‘(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)) ∈ (ℤ_≥‘(♯‘𝑀)))))
59	56, 57, 58	mp2b 10	. . . . . . . . . . 11 ⊢ ((𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ∈ (^◡♯ “ (ℤ_≥‘(♯‘𝑀))) ↔ ((𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ∈ V ∧ (♯‘(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)) ∈ (ℤ_≥‘(♯‘𝑀))))
60	49, 55, 59	sylanbrc 584	. . . . . . . . . 10 ⊢ (𝜑 → (𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ∈ (^◡♯ “ (ℤ_≥‘(♯‘𝑀))))
61	48, 60	elind 4195	. . . . . . . . 9 ⊢ (𝜑 → (𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ∈ (Word 𝑆 ∩ (^◡♯ “ (ℤ_≥‘(♯‘𝑀)))))
62	61, 11	eleqtrrdi 2845	. . . . . . . 8 ⊢ (𝜑 → (𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ∈ 𝑊)
63	62	adantr 482	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑎 ∈ (ℤ_≥‘(♯‘𝑀))) → (𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ∈ 𝑊)
64		ccatws1n0 14582	. . . . . . . . 9 ⊢ (𝑀 ∈ Word 𝑆 → (𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ≠ ∅)
65	1, 64	syl 17	. . . . . . . 8 ⊢ (𝜑 → (𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ≠ ∅)
66	65	adantr 482	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑎 ∈ (ℤ_≥‘(♯‘𝑀))) → (𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ≠ ∅)
67		eldifsn 4791	. . . . . . 7 ⊢ ((𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ∈ (𝑊 ∖ {∅}) ↔ ((𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ∈ 𝑊 ∧ (𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ≠ ∅))
68	63, 66, 67	sylanbrc 584	. . . . . 6 ⊢ ((𝜑 ∧ 𝑎 ∈ (ℤ_≥‘(♯‘𝑀))) → (𝑀 ++ ⟨“(𝐹‘𝑀)”⟩) ∈ (𝑊 ∖ {∅}))
69	41, 68	eqeltrd 2834	. . . . 5 ⊢ ((𝜑 ∧ 𝑎 ∈ (ℤ_≥‘(♯‘𝑀))) → ((ℕ₀ × {(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)})‘𝑎) ∈ (𝑊 ∖ {∅}))
70		eqidd 2734	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → (𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑥 ++ ⟨“(𝐹‘𝑥)”⟩)) = (𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑥 ++ ⟨“(𝐹‘𝑥)”⟩)))
71		simprl 770	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) ∧ (𝑥 = 𝑎 ∧ 𝑦 = 𝑏)) → 𝑥 = 𝑎)
72	71	fveq2d 6896	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) ∧ (𝑥 = 𝑎 ∧ 𝑦 = 𝑏)) → (𝐹‘𝑥) = (𝐹‘𝑎))
73	72	s1eqd 14551	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) ∧ (𝑥 = 𝑎 ∧ 𝑦 = 𝑏)) → ⟨“(𝐹‘𝑥)”⟩ = ⟨“(𝐹‘𝑎)”⟩)
74	71, 73	oveq12d 7427	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) ∧ (𝑥 = 𝑎 ∧ 𝑦 = 𝑏)) → (𝑥 ++ ⟨“(𝐹‘𝑥)”⟩) = (𝑎 ++ ⟨“(𝐹‘𝑎)”⟩))
75		vex 3479	. . . . . . . 8 ⊢ 𝑎 ∈ V
76	75	a1i 11	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → 𝑎 ∈ V)
77		vex 3479	. . . . . . . 8 ⊢ 𝑏 ∈ V
78	77	a1i 11	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → 𝑏 ∈ V)
79		ovex 7442	. . . . . . . 8 ⊢ (𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ∈ V
80	79	a1i 11	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → (𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ∈ V)
81	70, 74, 76, 78, 80	ovmpod 7560	. . . . . 6 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → (𝑎(𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑥 ++ ⟨“(𝐹‘𝑥)”⟩))𝑏) = (𝑎 ++ ⟨“(𝐹‘𝑎)”⟩))
82		eldifi 4127	. . . . . . . . . . . 12 ⊢ (𝑎 ∈ (𝑊 ∖ {∅}) → 𝑎 ∈ 𝑊)
83	82	ad2antrl 727	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → 𝑎 ∈ 𝑊)
84	13, 83	sselid 3981	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → 𝑎 ∈ Word 𝑆)
85	42	adantr 482	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → 𝐹:𝑊⟶𝑆)
86	85, 83	ffvelcdmd 7088	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → (𝐹‘𝑎) ∈ 𝑆)
87	86	s1cld 14553	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → ⟨“(𝐹‘𝑎)”⟩ ∈ Word 𝑆)
88		ccatcl 14524	. . . . . . . . . 10 ⊢ ((𝑎 ∈ Word 𝑆 ∧ ⟨“(𝐹‘𝑎)”⟩ ∈ Word 𝑆) → (𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ∈ Word 𝑆)
89	84, 87, 88	syl2anc 585	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → (𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ∈ Word 𝑆)
90	13, 82	sselid 3981	. . . . . . . . . . . . 13 ⊢ (𝑎 ∈ (𝑊 ∖ {∅}) → 𝑎 ∈ Word 𝑆)
91	90	ad2antrl 727	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → 𝑎 ∈ Word 𝑆)
92		ccatws1len 14570	. . . . . . . . . . . 12 ⊢ (𝑎 ∈ Word 𝑆 → (♯‘(𝑎 ++ ⟨“(𝐹‘𝑎)”⟩)) = ((♯‘𝑎) + 1))
93	91, 92	syl 17	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → (♯‘(𝑎 ++ ⟨“(𝐹‘𝑎)”⟩)) = ((♯‘𝑎) + 1))
94	83, 11	eleqtrdi 2844	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → 𝑎 ∈ (Word 𝑆 ∩ (^◡♯ “ (ℤ_≥‘(♯‘𝑀)))))
95	94	elin2d 4200	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → 𝑎 ∈ (^◡♯ “ (ℤ_≥‘(♯‘𝑀))))
96		elpreima 7060	. . . . . . . . . . . . . 14 ⊢ (♯ Fn V → (𝑎 ∈ (^◡♯ “ (ℤ_≥‘(♯‘𝑀))) ↔ (𝑎 ∈ V ∧ (♯‘𝑎) ∈ (ℤ_≥‘(♯‘𝑀)))))
97	56, 57, 96	mp2b 10	. . . . . . . . . . . . 13 ⊢ (𝑎 ∈ (^◡♯ “ (ℤ_≥‘(♯‘𝑀))) ↔ (𝑎 ∈ V ∧ (♯‘𝑎) ∈ (ℤ_≥‘(♯‘𝑀))))
98	95, 97	sylib 217	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → (𝑎 ∈ V ∧ (♯‘𝑎) ∈ (ℤ_≥‘(♯‘𝑀))))
99		peano2uz 12885	. . . . . . . . . . . 12 ⊢ ((♯‘𝑎) ∈ (ℤ_≥‘(♯‘𝑀)) → ((♯‘𝑎) + 1) ∈ (ℤ_≥‘(♯‘𝑀)))
100	98, 99	simpl2im 505	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → ((♯‘𝑎) + 1) ∈ (ℤ_≥‘(♯‘𝑀)))
101	93, 100	eqeltrd 2834	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → (♯‘(𝑎 ++ ⟨“(𝐹‘𝑎)”⟩)) ∈ (ℤ_≥‘(♯‘𝑀)))
102		elpreima 7060	. . . . . . . . . . 11 ⊢ (♯ Fn V → ((𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ∈ (^◡♯ “ (ℤ_≥‘(♯‘𝑀))) ↔ ((𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ∈ V ∧ (♯‘(𝑎 ++ ⟨“(𝐹‘𝑎)”⟩)) ∈ (ℤ_≥‘(♯‘𝑀)))))
103	56, 57, 102	mp2b 10	. . . . . . . . . 10 ⊢ ((𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ∈ (^◡♯ “ (ℤ_≥‘(♯‘𝑀))) ↔ ((𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ∈ V ∧ (♯‘(𝑎 ++ ⟨“(𝐹‘𝑎)”⟩)) ∈ (ℤ_≥‘(♯‘𝑀))))
104	80, 101, 103	sylanbrc 584	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → (𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ∈ (^◡♯ “ (ℤ_≥‘(♯‘𝑀))))
105	89, 104	elind 4195	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → (𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ∈ (Word 𝑆 ∩ (^◡♯ “ (ℤ_≥‘(♯‘𝑀)))))
106	105, 11	eleqtrrdi 2845	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → (𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ∈ 𝑊)
107		ccatws1n0 14582	. . . . . . . 8 ⊢ (𝑎 ∈ Word 𝑆 → (𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ≠ ∅)
108	91, 107	syl 17	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → (𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ≠ ∅)
109		eldifsn 4791	. . . . . . 7 ⊢ ((𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ∈ (𝑊 ∖ {∅}) ↔ ((𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ∈ 𝑊 ∧ (𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ≠ ∅))
110	106, 108, 109	sylanbrc 584	. . . . . 6 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → (𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ∈ (𝑊 ∖ {∅}))
111	81, 110	eqeltrd 2834	. . . . 5 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → (𝑎(𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑥 ++ ⟨“(𝐹‘𝑥)”⟩))𝑏) ∈ (𝑊 ∖ {∅}))
112	26, 29, 69, 111	seqf 13989	. . . 4 ⊢ (𝜑 → seq(♯‘𝑀)((𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑥 ++ ⟨“(𝐹‘𝑥)”⟩)), (ℕ₀ × {(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)})):(ℤ_≥‘(♯‘𝑀))⟶(𝑊 ∖ {∅}))
113		fco2 6745	. . . 4 ⊢ (((lastS ↾ (𝑊 ∖ {∅})):(𝑊 ∖ {∅})⟶𝑆 ∧ seq(♯‘𝑀)((𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑥 ++ ⟨“(𝐹‘𝑥)”⟩)), (ℕ₀ × {(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)})):(ℤ_≥‘(♯‘𝑀))⟶(𝑊 ∖ {∅})) → (lastS ∘ seq(♯‘𝑀)((𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑥 ++ ⟨“(𝐹‘𝑥)”⟩)), (ℕ₀ × {(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)}))):(ℤ_≥‘(♯‘𝑀))⟶𝑆)
114	25, 112, 113	syl2anc 585	. . 3 ⊢ (𝜑 → (lastS ∘ seq(♯‘𝑀)((𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑥 ++ ⟨“(𝐹‘𝑥)”⟩)), (ℕ₀ × {(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)}))):(ℤ_≥‘(♯‘𝑀))⟶𝑆)
115		fzouzdisj 13668	. . . 4 ⊢ ((0..^(♯‘𝑀)) ∩ (ℤ_≥‘(♯‘𝑀))) = ∅
116	115	a1i 11	. . 3 ⊢ (𝜑 → ((0..^(♯‘𝑀)) ∩ (ℤ_≥‘(♯‘𝑀))) = ∅)
117		fun 6754	. . 3 ⊢ (((𝑀:(0..^(♯‘𝑀))⟶𝑆 ∧ (lastS ∘ seq(♯‘𝑀)((𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑥 ++ ⟨“(𝐹‘𝑥)”⟩)), (ℕ₀ × {(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)}))):(ℤ_≥‘(♯‘𝑀))⟶𝑆) ∧ ((0..^(♯‘𝑀)) ∩ (ℤ_≥‘(♯‘𝑀))) = ∅) → (𝑀 ∪ (lastS ∘ seq(♯‘𝑀)((𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑥 ++ ⟨“(𝐹‘𝑥)”⟩)), (ℕ₀ × {(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)})))):((0..^(♯‘𝑀)) ∪ (ℤ_≥‘(♯‘𝑀)))⟶(𝑆 ∪ 𝑆))
118	3, 114, 116, 117	syl21anc 837	. 2 ⊢ (𝜑 → (𝑀 ∪ (lastS ∘ seq(♯‘𝑀)((𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑥 ++ ⟨“(𝐹‘𝑥)”⟩)), (ℕ₀ × {(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)})))):((0..^(♯‘𝑀)) ∪ (ℤ_≥‘(♯‘𝑀)))⟶(𝑆 ∪ 𝑆))
119	43, 1, 11, 42	sseqval 33387	. . 3 ⊢ (𝜑 → (𝑀seq_str𝐹) = (𝑀 ∪ (lastS ∘ seq(♯‘𝑀)((𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑥 ++ ⟨“(𝐹‘𝑥)”⟩)), (ℕ₀ × {(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)})))))
120		fzouzsplit 13667	. . . . . 6 ⊢ ((♯‘𝑀) ∈ (ℤ_≥‘0) → (ℤ_≥‘0) = ((0..^(♯‘𝑀)) ∪ (ℤ_≥‘(♯‘𝑀))))
121	34, 120	sylbi 216	. . . . 5 ⊢ ((♯‘𝑀) ∈ ℕ₀ → (ℤ_≥‘0) = ((0..^(♯‘𝑀)) ∪ (ℤ_≥‘(♯‘𝑀))))
122	1, 27, 121	3syl 18	. . . 4 ⊢ (𝜑 → (ℤ_≥‘0) = ((0..^(♯‘𝑀)) ∪ (ℤ_≥‘(♯‘𝑀))))
123	38, 122	eqtrid 2785	. . 3 ⊢ (𝜑 → ℕ₀ = ((0..^(♯‘𝑀)) ∪ (ℤ_≥‘(♯‘𝑀))))
124		unidm 4153	. . . . 5 ⊢ (𝑆 ∪ 𝑆) = 𝑆
125	124	a1i 11	. . . 4 ⊢ (𝜑 → (𝑆 ∪ 𝑆) = 𝑆)
126	125	eqcomd 2739	. . 3 ⊢ (𝜑 → 𝑆 = (𝑆 ∪ 𝑆))
127	119, 123, 126	feq123d 6707	. 2 ⊢ (𝜑 → ((𝑀seq_str𝐹):ℕ₀⟶𝑆 ↔ (𝑀 ∪ (lastS ∘ seq(♯‘𝑀)((𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑥 ++ ⟨“(𝐹‘𝑥)”⟩)), (ℕ₀ × {(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)})))):((0..^(♯‘𝑀)) ∪ (ℤ_≥‘(♯‘𝑀)))⟶(𝑆 ∪ 𝑆)))
128	118, 127	mpbird 257	1 ⊢ (𝜑 → (𝑀seq_str𝐹):ℕ₀⟶𝑆)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 397 = wceq 1542 ∈ wcel 2107 ≠ wne 2941 ∀wral 3062 Vcvv 3475 ∖ cdif 3946 ∪ cun 3947 ∩ cin 3948 ∅c0 4323 {csn 4629 × cxp 5675 ^◡ccnv 5676 dom cdm 5677 ↾ cres 5679 “ cima 5680 ∘ ccom 5681 Fun wfun 6538 Fn wfn 6539 ⟶wf 6540 ‘cfv 6544 (class class class)co 7409 ∈ cmpo 7411 0cc0 11110 1c1 11111 + caddc 11113 +∞cpnf 11245 − cmin 11444 ℕ₀cn0 12472 ℤcz 12558 ℤ_≥cuz 12822 ..^cfzo 13627 seqcseq 13966 ♯chash 14290 Word cword 14464 lastSclsw 14512 ++ cconcat 14520 ⟨“cs1 14545 seq_strcsseq 33382

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 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 ax-inf2 9636 ax-cnex 11166 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186 ax-pre-mulgt0 11187

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-int 4952 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-riota 7365 df-ov 7412 df-oprab 7413 df-mpo 7414 df-om 7856 df-1st 7975 df-2nd 7976 df-frecs 8266 df-wrecs 8297 df-recs 8371 df-rdg 8410 df-1o 8466 df-er 8703 df-map 8822 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-card 9934 df-pnf 11250 df-mnf 11251 df-xr 11252 df-ltxr 11253 df-le 11254 df-sub 11446 df-neg 11447 df-nn 12213 df-n0 12473 df-xnn0 12545 df-z 12559 df-uz 12823 df-fz 13485 df-fzo 13628 df-seq 13967 df-hash 14291 df-word 14465 df-lsw 14513 df-concat 14521 df-s1 14546 df-sseq 33383

This theorem is referenced by: sseqp1 33394 fibp1 33400

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