sseqf - Mathbox for Thierry Arnoux

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Theorem sseqf 33380

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 14466	. . . 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 6902	. . . . . . . . 9 ⊢ (𝑥‘((♯‘𝑥) − 1)) ∈ V
7		df-lsw 14510	. . . . . . . . 9 ⊢ lastS = (𝑥 ∈ V ↦ (𝑥‘((♯‘𝑥) − 1)))
8	6, 7	dmmpti 6692	. . . . . . . 8 ⊢ dom lastS = V
9	5, 8	eleqtrrdi 2845	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑤 ∈ (𝑊 ∖ {∅})) → 𝑤 ∈ dom lastS)
10		eldifsn 4790	. . . . . . . . 9 ⊢ (𝑤 ∈ (𝑊 ∖ {∅}) ↔ (𝑤 ∈ 𝑊 ∧ 𝑤 ≠ ∅))
11		sseqval.3	. . . . . . . . . . . 12 ⊢ 𝑊 = (Word 𝑆 ∩ (^◡♯ “ (ℤ_≥‘(♯‘𝑀))))
12		inss1 4228	. . . . . . . . . . . 12 ⊢ (Word 𝑆 ∩ (^◡♯ “ (ℤ_≥‘(♯‘𝑀)))) ⊆ Word 𝑆
13	11, 12	eqsstri 4016	. . . . . . . . . . 11 ⊢ 𝑊 ⊆ Word 𝑆
14	13	sseli 3978	. . . . . . . . . 10 ⊢ (𝑤 ∈ 𝑊 → 𝑤 ∈ Word 𝑆)
15		lswcl 14515	. . . . . . . . . 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 6691	. . . . . 6 ⊢ lastS Fn V
22		fnfun 6647	. . . . . 6 ⊢ (lastS Fn V → Fun lastS)
23		ffvresb 7121	. . . . . 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 14480	. . . . . . 7 ⊢ (𝑀 ∈ Word 𝑆 → (♯‘𝑀) ∈ ℕ₀)
28	27	nn0zd 12581	. . . . . 6 ⊢ (𝑀 ∈ Word 𝑆 → (♯‘𝑀) ∈ ℤ)
29	1, 28	syl 17	. . . . 5 ⊢ (𝜑 → (♯‘𝑀) ∈ ℤ)
30		ovex 7439	. . . . . . 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 12864	. . . . . . . . . 10 ⊢ ((♯‘𝑀) ∈ ℕ₀ ↔ (♯‘𝑀) ∈ (ℤ_≥‘0))
35	33, 34	sylib 217	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑎 ∈ (ℤ_≥‘(♯‘𝑀))) → (♯‘𝑀) ∈ (ℤ_≥‘0))
36		uztrn 12837	. . . . . . . . 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 12861	. . . . . . . 8 ⊢ ℕ₀ = (ℤ_≥‘0)
39	37, 38	eleqtrrdi 2845	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑎 ∈ (ℤ_≥‘(♯‘𝑀))) → 𝑎 ∈ ℕ₀)
40		fvconst2g 7200	. . . . . . 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 33379	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑀 ∈ 𝑊)
45	42, 44	ffvelcdmd 7085	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐹‘𝑀) ∈ 𝑆)
46	45	s1cld 14550	. . . . . . . . . . 11 ⊢ (𝜑 → ⟨“(𝐹‘𝑀)”⟩ ∈ Word 𝑆)
47		ccatcl 14521	. . . . . . . . . . 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 14567	. . . . . . . . . . . . 13 ⊢ (𝑀 ∈ Word 𝑆 → (♯‘(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)) = ((♯‘𝑀) + 1))
51	1, 50	syl 17	. . . . . . . . . . . 12 ⊢ (𝜑 → (♯‘(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)) = ((♯‘𝑀) + 1))
52		uzid 12834	. . . . . . . . . . . . 13 ⊢ ((♯‘𝑀) ∈ ℤ → (♯‘𝑀) ∈ (ℤ_≥‘(♯‘𝑀)))
53		peano2uz 12882	. . . . . . . . . . . . 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 14295	. . . . . . . . . . . 12 ⊢ ♯:V⟶(ℕ₀ ∪ {+∞})
57		ffn 6715	. . . . . . . . . . . 12 ⊢ (♯:V⟶(ℕ₀ ∪ {+∞}) → ♯ Fn V)
58		elpreima 7057	. . . . . . . . . . . 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 4194	. . . . . . . . 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 14579	. . . . . . . . 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 4790	. . . . . . 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 6893	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) ∧ (𝑥 = 𝑎 ∧ 𝑦 = 𝑏)) → (𝐹‘𝑥) = (𝐹‘𝑎))
73	72	s1eqd 14548	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) ∧ (𝑥 = 𝑎 ∧ 𝑦 = 𝑏)) → ⟨“(𝐹‘𝑥)”⟩ = ⟨“(𝐹‘𝑎)”⟩)
74	71, 73	oveq12d 7424	. . . . . . 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 7439	. . . . . . . 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 7557	. . . . . 6 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → (𝑎(𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑥 ++ ⟨“(𝐹‘𝑥)”⟩))𝑏) = (𝑎 ++ ⟨“(𝐹‘𝑎)”⟩))
82		eldifi 4126	. . . . . . . . . . . 12 ⊢ (𝑎 ∈ (𝑊 ∖ {∅}) → 𝑎 ∈ 𝑊)
83	82	ad2antrl 727	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → 𝑎 ∈ 𝑊)
84	13, 83	sselid 3980	. . . . . . . . . 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 7085	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → (𝐹‘𝑎) ∈ 𝑆)
87	86	s1cld 14550	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → ⟨“(𝐹‘𝑎)”⟩ ∈ Word 𝑆)
88		ccatcl 14521	. . . . . . . . . 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 3980	. . . . . . . . . . . . 13 ⊢ (𝑎 ∈ (𝑊 ∖ {∅}) → 𝑎 ∈ Word 𝑆)
91	90	ad2antrl 727	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → 𝑎 ∈ Word 𝑆)
92		ccatws1len 14567	. . . . . . . . . . . 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 4199	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → 𝑎 ∈ (^◡♯ “ (ℤ_≥‘(♯‘𝑀))))
96		elpreima 7057	. . . . . . . . . . . . . 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 12882	. . . . . . . . . . . 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 7057	. . . . . . . . . . 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 4194	. . . . . . . 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 14579	. . . . . . . 8 ⊢ (𝑎 ∈ Word 𝑆 → (𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ≠ ∅)
108	91, 107	syl 17	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝑊 ∖ {∅}) ∧ 𝑏 ∈ (𝑊 ∖ {∅}))) → (𝑎 ++ ⟨“(𝐹‘𝑎)”⟩) ≠ ∅)
109		eldifsn 4790	. . . . . . 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 13986	. . . 4 ⊢ (𝜑 → seq(♯‘𝑀)((𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑥 ++ ⟨“(𝐹‘𝑥)”⟩)), (ℕ₀ × {(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)})):(ℤ_≥‘(♯‘𝑀))⟶(𝑊 ∖ {∅}))
113		fco2 6742	. . . 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 13665	. . . 4 ⊢ ((0..^(♯‘𝑀)) ∩ (ℤ_≥‘(♯‘𝑀))) = ∅
116	115	a1i 11	. . 3 ⊢ (𝜑 → ((0..^(♯‘𝑀)) ∩ (ℤ_≥‘(♯‘𝑀))) = ∅)
117		fun 6751	. . 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 33376	. . 3 ⊢ (𝜑 → (𝑀seq_str𝐹) = (𝑀 ∪ (lastS ∘ seq(♯‘𝑀)((𝑥 ∈ V, 𝑦 ∈ V ↦ (𝑥 ++ ⟨“(𝐹‘𝑥)”⟩)), (ℕ₀ × {(𝑀 ++ ⟨“(𝐹‘𝑀)”⟩)})))))
120		fzouzsplit 13664	. . . . . 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 4152	. . . . 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 6704	. 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 3945 ∪ cun 3946 ∩ cin 3947 ∅c0 4322 {csn 4628 × cxp 5674 ^◡ccnv 5675 dom cdm 5676 ↾ cres 5678 “ cima 5679 ∘ ccom 5680 Fun wfun 6535 Fn wfn 6536 ⟶wf 6537 ‘cfv 6541 (class class class)co 7406 ∈ cmpo 7408 0cc0 11107 1c1 11108 + caddc 11110 +∞cpnf 11242 − cmin 11441 ℕ₀cn0 12469 ℤcz 12555 ℤ_≥cuz 12819 ..^cfzo 13624 seqcseq 13963 ♯chash 14287 Word cword 14461 lastSclsw 14509 ++ cconcat 14517 ⟨“cs1 14542 seq_strcsseq 33371

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 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7722 ax-inf2 9633 ax-cnex 11163 ax-resscn 11164 ax-1cn 11165 ax-icn 11166 ax-addcl 11167 ax-addrcl 11168 ax-mulcl 11169 ax-mulrcl 11170 ax-mulcom 11171 ax-addass 11172 ax-mulass 11173 ax-distr 11174 ax-i2m1 11175 ax-1ne0 11176 ax-1rid 11177 ax-rnegex 11178 ax-rrecex 11179 ax-cnre 11180 ax-pre-lttri 11181 ax-pre-lttrn 11182 ax-pre-ltadd 11183 ax-pre-mulgt0 11184

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 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-int 4951 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6298 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6493 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 df-fo 6547 df-f1o 6548 df-fv 6549 df-riota 7362 df-ov 7409 df-oprab 7410 df-mpo 7411 df-om 7853 df-1st 7972 df-2nd 7973 df-frecs 8263 df-wrecs 8294 df-recs 8368 df-rdg 8407 df-1o 8463 df-er 8700 df-map 8819 df-en 8937 df-dom 8938 df-sdom 8939 df-fin 8940 df-card 9931 df-pnf 11247 df-mnf 11248 df-xr 11249 df-ltxr 11250 df-le 11251 df-sub 11443 df-neg 11444 df-nn 12210 df-n0 12470 df-xnn0 12542 df-z 12556 df-uz 12820 df-fz 13482 df-fzo 13625 df-seq 13964 df-hash 14288 df-word 14462 df-lsw 14510 df-concat 14518 df-s1 14543 df-sseq 33372

This theorem is referenced by: sseqp1 33383 fibp1 33389

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