splval2 - Metamath Proof Explorer

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Theorem splval2 14729

Description: Value of a splice, assuming the input word 𝑆 has already been decomposed into its pieces. (Contributed by Mario Carneiro, 1-Oct-2015.) (Proof shortened by AV, 15-Oct-2022.)

**Hypotheses**
Ref	Expression
splval2.a	⊢ (𝜑 → 𝐴 ∈ Word 𝑋)
splval2.b	⊢ (𝜑 → 𝐵 ∈ Word 𝑋)
splval2.c	⊢ (𝜑 → 𝐶 ∈ Word 𝑋)
splval2.r	⊢ (𝜑 → 𝑅 ∈ Word 𝑋)
splval2.s	⊢ (𝜑 → 𝑆 = ((𝐴 ++ 𝐵) ++ 𝐶))
splval2.f	⊢ (𝜑 → 𝐹 = (♯‘𝐴))
splval2.t	⊢ (𝜑 → 𝑇 = (𝐹 + (♯‘𝐵)))

**Assertion**
Ref	Expression
splval2	⊢ (𝜑 → (𝑆 splice ⟨𝐹, 𝑇, 𝑅⟩) = ((𝐴 ++ 𝑅) ++ 𝐶))

**Proof of Theorem splval2**
Step	Hyp	Ref	Expression
1		splval2.s	. . . 4 ⊢ (𝜑 → 𝑆 = ((𝐴 ++ 𝐵) ++ 𝐶))
2		splval2.a	. . . . . 6 ⊢ (𝜑 → 𝐴 ∈ Word 𝑋)
3		splval2.b	. . . . . 6 ⊢ (𝜑 → 𝐵 ∈ Word 𝑋)
4		ccatcl 14546	. . . . . 6 ⊢ ((𝐴 ∈ Word 𝑋 ∧ 𝐵 ∈ Word 𝑋) → (𝐴 ++ 𝐵) ∈ Word 𝑋)
5	2, 3, 4	syl2anc 584	. . . . 5 ⊢ (𝜑 → (𝐴 ++ 𝐵) ∈ Word 𝑋)
6		splval2.c	. . . . 5 ⊢ (𝜑 → 𝐶 ∈ Word 𝑋)
7		ccatcl 14546	. . . . 5 ⊢ (((𝐴 ++ 𝐵) ∈ Word 𝑋 ∧ 𝐶 ∈ Word 𝑋) → ((𝐴 ++ 𝐵) ++ 𝐶) ∈ Word 𝑋)
8	5, 6, 7	syl2anc 584	. . . 4 ⊢ (𝜑 → ((𝐴 ++ 𝐵) ++ 𝐶) ∈ Word 𝑋)
9	1, 8	eqeltrd 2829	. . 3 ⊢ (𝜑 → 𝑆 ∈ Word 𝑋)
10		splval2.f	. . . 4 ⊢ (𝜑 → 𝐹 = (♯‘𝐴))
11		lencl 14505	. . . . 5 ⊢ (𝐴 ∈ Word 𝑋 → (♯‘𝐴) ∈ ℕ₀)
12	2, 11	syl 17	. . . 4 ⊢ (𝜑 → (♯‘𝐴) ∈ ℕ₀)
13	10, 12	eqeltrd 2829	. . 3 ⊢ (𝜑 → 𝐹 ∈ ℕ₀)
14		splval2.t	. . . 4 ⊢ (𝜑 → 𝑇 = (𝐹 + (♯‘𝐵)))
15		lencl 14505	. . . . . 6 ⊢ (𝐵 ∈ Word 𝑋 → (♯‘𝐵) ∈ ℕ₀)
16	3, 15	syl 17	. . . . 5 ⊢ (𝜑 → (♯‘𝐵) ∈ ℕ₀)
17	13, 16	nn0addcld 12514	. . . 4 ⊢ (𝜑 → (𝐹 + (♯‘𝐵)) ∈ ℕ₀)
18	14, 17	eqeltrd 2829	. . 3 ⊢ (𝜑 → 𝑇 ∈ ℕ₀)
19		splval2.r	. . 3 ⊢ (𝜑 → 𝑅 ∈ Word 𝑋)
20		splval 14723	. . 3 ⊢ ((𝑆 ∈ Word 𝑋 ∧ (𝐹 ∈ ℕ₀ ∧ 𝑇 ∈ ℕ₀ ∧ 𝑅 ∈ Word 𝑋)) → (𝑆 splice ⟨𝐹, 𝑇, 𝑅⟩) = (((𝑆 prefix 𝐹) ++ 𝑅) ++ (𝑆 substr ⟨𝑇, (♯‘𝑆)⟩)))
21	9, 13, 18, 19, 20	syl13anc 1374	. 2 ⊢ (𝜑 → (𝑆 splice ⟨𝐹, 𝑇, 𝑅⟩) = (((𝑆 prefix 𝐹) ++ 𝑅) ++ (𝑆 substr ⟨𝑇, (♯‘𝑆)⟩)))
22		nn0uz 12842	. . . . . . . . . 10 ⊢ ℕ₀ = (ℤ_≥‘0)
23	13, 22	eleqtrdi 2839	. . . . . . . . 9 ⊢ (𝜑 → 𝐹 ∈ (ℤ_≥‘0))
24	13	nn0zd 12562	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝐹 ∈ ℤ)
25	24	uzidd 12816	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐹 ∈ (ℤ_≥‘𝐹))
26		uzaddcl 12870	. . . . . . . . . . 11 ⊢ ((𝐹 ∈ (ℤ_≥‘𝐹) ∧ (♯‘𝐵) ∈ ℕ₀) → (𝐹 + (♯‘𝐵)) ∈ (ℤ_≥‘𝐹))
27	25, 16, 26	syl2anc 584	. . . . . . . . . 10 ⊢ (𝜑 → (𝐹 + (♯‘𝐵)) ∈ (ℤ_≥‘𝐹))
28	14, 27	eqeltrd 2829	. . . . . . . . 9 ⊢ (𝜑 → 𝑇 ∈ (ℤ_≥‘𝐹))
29		elfzuzb 13486	. . . . . . . . 9 ⊢ (𝐹 ∈ (0...𝑇) ↔ (𝐹 ∈ (ℤ_≥‘0) ∧ 𝑇 ∈ (ℤ_≥‘𝐹)))
30	23, 28, 29	sylanbrc 583	. . . . . . . 8 ⊢ (𝜑 → 𝐹 ∈ (0...𝑇))
31	18, 22	eleqtrdi 2839	. . . . . . . . 9 ⊢ (𝜑 → 𝑇 ∈ (ℤ_≥‘0))
32		ccatlen 14547	. . . . . . . . . . . 12 ⊢ (((𝐴 ++ 𝐵) ∈ Word 𝑋 ∧ 𝐶 ∈ Word 𝑋) → (♯‘((𝐴 ++ 𝐵) ++ 𝐶)) = ((♯‘(𝐴 ++ 𝐵)) + (♯‘𝐶)))
33	5, 6, 32	syl2anc 584	. . . . . . . . . . 11 ⊢ (𝜑 → (♯‘((𝐴 ++ 𝐵) ++ 𝐶)) = ((♯‘(𝐴 ++ 𝐵)) + (♯‘𝐶)))
34	1	fveq2d 6865	. . . . . . . . . . 11 ⊢ (𝜑 → (♯‘𝑆) = (♯‘((𝐴 ++ 𝐵) ++ 𝐶)))
35	10	oveq1d 7405	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝐹 + (♯‘𝐵)) = ((♯‘𝐴) + (♯‘𝐵)))
36		ccatlen 14547	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ Word 𝑋 ∧ 𝐵 ∈ Word 𝑋) → (♯‘(𝐴 ++ 𝐵)) = ((♯‘𝐴) + (♯‘𝐵)))
37	2, 3, 36	syl2anc 584	. . . . . . . . . . . . 13 ⊢ (𝜑 → (♯‘(𝐴 ++ 𝐵)) = ((♯‘𝐴) + (♯‘𝐵)))
38	35, 14, 37	3eqtr4d 2775	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑇 = (♯‘(𝐴 ++ 𝐵)))
39	38	oveq1d 7405	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑇 + (♯‘𝐶)) = ((♯‘(𝐴 ++ 𝐵)) + (♯‘𝐶)))
40	33, 34, 39	3eqtr4d 2775	. . . . . . . . . 10 ⊢ (𝜑 → (♯‘𝑆) = (𝑇 + (♯‘𝐶)))
41	18	nn0zd 12562	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑇 ∈ ℤ)
42	41	uzidd 12816	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑇 ∈ (ℤ_≥‘𝑇))
43		lencl 14505	. . . . . . . . . . . 12 ⊢ (𝐶 ∈ Word 𝑋 → (♯‘𝐶) ∈ ℕ₀)
44	6, 43	syl 17	. . . . . . . . . . 11 ⊢ (𝜑 → (♯‘𝐶) ∈ ℕ₀)
45		uzaddcl 12870	. . . . . . . . . . 11 ⊢ ((𝑇 ∈ (ℤ_≥‘𝑇) ∧ (♯‘𝐶) ∈ ℕ₀) → (𝑇 + (♯‘𝐶)) ∈ (ℤ_≥‘𝑇))
46	42, 44, 45	syl2anc 584	. . . . . . . . . 10 ⊢ (𝜑 → (𝑇 + (♯‘𝐶)) ∈ (ℤ_≥‘𝑇))
47	40, 46	eqeltrd 2829	. . . . . . . . 9 ⊢ (𝜑 → (♯‘𝑆) ∈ (ℤ_≥‘𝑇))
48		elfzuzb 13486	. . . . . . . . 9 ⊢ (𝑇 ∈ (0...(♯‘𝑆)) ↔ (𝑇 ∈ (ℤ_≥‘0) ∧ (♯‘𝑆) ∈ (ℤ_≥‘𝑇)))
49	31, 47, 48	sylanbrc 583	. . . . . . . 8 ⊢ (𝜑 → 𝑇 ∈ (0...(♯‘𝑆)))
50		ccatpfx 14673	. . . . . . . 8 ⊢ ((𝑆 ∈ Word 𝑋 ∧ 𝐹 ∈ (0...𝑇) ∧ 𝑇 ∈ (0...(♯‘𝑆))) → ((𝑆 prefix 𝐹) ++ (𝑆 substr ⟨𝐹, 𝑇⟩)) = (𝑆 prefix 𝑇))
51	9, 30, 49, 50	syl3anc 1373	. . . . . . 7 ⊢ (𝜑 → ((𝑆 prefix 𝐹) ++ (𝑆 substr ⟨𝐹, 𝑇⟩)) = (𝑆 prefix 𝑇))
52		lencl 14505	. . . . . . . . . . . . . 14 ⊢ (𝑆 ∈ Word 𝑋 → (♯‘𝑆) ∈ ℕ₀)
53	9, 52	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → (♯‘𝑆) ∈ ℕ₀)
54	53, 22	eleqtrdi 2839	. . . . . . . . . . . 12 ⊢ (𝜑 → (♯‘𝑆) ∈ (ℤ_≥‘0))
55		eluzfz2 13500	. . . . . . . . . . . 12 ⊢ ((♯‘𝑆) ∈ (ℤ_≥‘0) → (♯‘𝑆) ∈ (0...(♯‘𝑆)))
56	54, 55	syl 17	. . . . . . . . . . 11 ⊢ (𝜑 → (♯‘𝑆) ∈ (0...(♯‘𝑆)))
57		ccatpfx 14673	. . . . . . . . . . 11 ⊢ ((𝑆 ∈ Word 𝑋 ∧ 𝑇 ∈ (0...(♯‘𝑆)) ∧ (♯‘𝑆) ∈ (0...(♯‘𝑆))) → ((𝑆 prefix 𝑇) ++ (𝑆 substr ⟨𝑇, (♯‘𝑆)⟩)) = (𝑆 prefix (♯‘𝑆)))
58	9, 49, 56, 57	syl3anc 1373	. . . . . . . . . 10 ⊢ (𝜑 → ((𝑆 prefix 𝑇) ++ (𝑆 substr ⟨𝑇, (♯‘𝑆)⟩)) = (𝑆 prefix (♯‘𝑆)))
59		pfxid 14656	. . . . . . . . . . 11 ⊢ (𝑆 ∈ Word 𝑋 → (𝑆 prefix (♯‘𝑆)) = 𝑆)
60	9, 59	syl 17	. . . . . . . . . 10 ⊢ (𝜑 → (𝑆 prefix (♯‘𝑆)) = 𝑆)
61	58, 60, 1	3eqtrd 2769	. . . . . . . . 9 ⊢ (𝜑 → ((𝑆 prefix 𝑇) ++ (𝑆 substr ⟨𝑇, (♯‘𝑆)⟩)) = ((𝐴 ++ 𝐵) ++ 𝐶))
62		pfxcl 14649	. . . . . . . . . . 11 ⊢ (𝑆 ∈ Word 𝑋 → (𝑆 prefix 𝑇) ∈ Word 𝑋)
63	9, 62	syl 17	. . . . . . . . . 10 ⊢ (𝜑 → (𝑆 prefix 𝑇) ∈ Word 𝑋)
64		swrdcl 14617	. . . . . . . . . . 11 ⊢ (𝑆 ∈ Word 𝑋 → (𝑆 substr ⟨𝑇, (♯‘𝑆)⟩) ∈ Word 𝑋)
65	9, 64	syl 17	. . . . . . . . . 10 ⊢ (𝜑 → (𝑆 substr ⟨𝑇, (♯‘𝑆)⟩) ∈ Word 𝑋)
66		pfxlen 14655	. . . . . . . . . . . 12 ⊢ ((𝑆 ∈ Word 𝑋 ∧ 𝑇 ∈ (0...(♯‘𝑆))) → (♯‘(𝑆 prefix 𝑇)) = 𝑇)
67	9, 49, 66	syl2anc 584	. . . . . . . . . . 11 ⊢ (𝜑 → (♯‘(𝑆 prefix 𝑇)) = 𝑇)
68	67, 38	eqtrd 2765	. . . . . . . . . 10 ⊢ (𝜑 → (♯‘(𝑆 prefix 𝑇)) = (♯‘(𝐴 ++ 𝐵)))
69		ccatopth 14688	. . . . . . . . . 10 ⊢ ((((𝑆 prefix 𝑇) ∈ Word 𝑋 ∧ (𝑆 substr ⟨𝑇, (♯‘𝑆)⟩) ∈ Word 𝑋) ∧ ((𝐴 ++ 𝐵) ∈ Word 𝑋 ∧ 𝐶 ∈ Word 𝑋) ∧ (♯‘(𝑆 prefix 𝑇)) = (♯‘(𝐴 ++ 𝐵))) → (((𝑆 prefix 𝑇) ++ (𝑆 substr ⟨𝑇, (♯‘𝑆)⟩)) = ((𝐴 ++ 𝐵) ++ 𝐶) ↔ ((𝑆 prefix 𝑇) = (𝐴 ++ 𝐵) ∧ (𝑆 substr ⟨𝑇, (♯‘𝑆)⟩) = 𝐶)))
70	63, 65, 5, 6, 68, 69	syl221anc 1383	. . . . . . . . 9 ⊢ (𝜑 → (((𝑆 prefix 𝑇) ++ (𝑆 substr ⟨𝑇, (♯‘𝑆)⟩)) = ((𝐴 ++ 𝐵) ++ 𝐶) ↔ ((𝑆 prefix 𝑇) = (𝐴 ++ 𝐵) ∧ (𝑆 substr ⟨𝑇, (♯‘𝑆)⟩) = 𝐶)))
71	61, 70	mpbid 232	. . . . . . . 8 ⊢ (𝜑 → ((𝑆 prefix 𝑇) = (𝐴 ++ 𝐵) ∧ (𝑆 substr ⟨𝑇, (♯‘𝑆)⟩) = 𝐶))
72	71	simpld 494	. . . . . . 7 ⊢ (𝜑 → (𝑆 prefix 𝑇) = (𝐴 ++ 𝐵))
73	51, 72	eqtrd 2765	. . . . . 6 ⊢ (𝜑 → ((𝑆 prefix 𝐹) ++ (𝑆 substr ⟨𝐹, 𝑇⟩)) = (𝐴 ++ 𝐵))
74		pfxcl 14649	. . . . . . . 8 ⊢ (𝑆 ∈ Word 𝑋 → (𝑆 prefix 𝐹) ∈ Word 𝑋)
75	9, 74	syl 17	. . . . . . 7 ⊢ (𝜑 → (𝑆 prefix 𝐹) ∈ Word 𝑋)
76		swrdcl 14617	. . . . . . . 8 ⊢ (𝑆 ∈ Word 𝑋 → (𝑆 substr ⟨𝐹, 𝑇⟩) ∈ Word 𝑋)
77	9, 76	syl 17	. . . . . . 7 ⊢ (𝜑 → (𝑆 substr ⟨𝐹, 𝑇⟩) ∈ Word 𝑋)
78		uztrn 12818	. . . . . . . . . . 11 ⊢ (((♯‘𝑆) ∈ (ℤ_≥‘𝑇) ∧ 𝑇 ∈ (ℤ_≥‘𝐹)) → (♯‘𝑆) ∈ (ℤ_≥‘𝐹))
79	47, 28, 78	syl2anc 584	. . . . . . . . . 10 ⊢ (𝜑 → (♯‘𝑆) ∈ (ℤ_≥‘𝐹))
80		elfzuzb 13486	. . . . . . . . . 10 ⊢ (𝐹 ∈ (0...(♯‘𝑆)) ↔ (𝐹 ∈ (ℤ_≥‘0) ∧ (♯‘𝑆) ∈ (ℤ_≥‘𝐹)))
81	23, 79, 80	sylanbrc 583	. . . . . . . . 9 ⊢ (𝜑 → 𝐹 ∈ (0...(♯‘𝑆)))
82		pfxlen 14655	. . . . . . . . 9 ⊢ ((𝑆 ∈ Word 𝑋 ∧ 𝐹 ∈ (0...(♯‘𝑆))) → (♯‘(𝑆 prefix 𝐹)) = 𝐹)
83	9, 81, 82	syl2anc 584	. . . . . . . 8 ⊢ (𝜑 → (♯‘(𝑆 prefix 𝐹)) = 𝐹)
84	83, 10	eqtrd 2765	. . . . . . 7 ⊢ (𝜑 → (♯‘(𝑆 prefix 𝐹)) = (♯‘𝐴))
85		ccatopth 14688	. . . . . . 7 ⊢ ((((𝑆 prefix 𝐹) ∈ Word 𝑋 ∧ (𝑆 substr ⟨𝐹, 𝑇⟩) ∈ Word 𝑋) ∧ (𝐴 ∈ Word 𝑋 ∧ 𝐵 ∈ Word 𝑋) ∧ (♯‘(𝑆 prefix 𝐹)) = (♯‘𝐴)) → (((𝑆 prefix 𝐹) ++ (𝑆 substr ⟨𝐹, 𝑇⟩)) = (𝐴 ++ 𝐵) ↔ ((𝑆 prefix 𝐹) = 𝐴 ∧ (𝑆 substr ⟨𝐹, 𝑇⟩) = 𝐵)))
86	75, 77, 2, 3, 84, 85	syl221anc 1383	. . . . . 6 ⊢ (𝜑 → (((𝑆 prefix 𝐹) ++ (𝑆 substr ⟨𝐹, 𝑇⟩)) = (𝐴 ++ 𝐵) ↔ ((𝑆 prefix 𝐹) = 𝐴 ∧ (𝑆 substr ⟨𝐹, 𝑇⟩) = 𝐵)))
87	73, 86	mpbid 232	. . . . 5 ⊢ (𝜑 → ((𝑆 prefix 𝐹) = 𝐴 ∧ (𝑆 substr ⟨𝐹, 𝑇⟩) = 𝐵))
88	87	simpld 494	. . . 4 ⊢ (𝜑 → (𝑆 prefix 𝐹) = 𝐴)
89	88	oveq1d 7405	. . 3 ⊢ (𝜑 → ((𝑆 prefix 𝐹) ++ 𝑅) = (𝐴 ++ 𝑅))
90	71	simprd 495	. . 3 ⊢ (𝜑 → (𝑆 substr ⟨𝑇, (♯‘𝑆)⟩) = 𝐶)
91	89, 90	oveq12d 7408	. 2 ⊢ (𝜑 → (((𝑆 prefix 𝐹) ++ 𝑅) ++ (𝑆 substr ⟨𝑇, (♯‘𝑆)⟩)) = ((𝐴 ++ 𝑅) ++ 𝐶))
92	21, 91	eqtrd 2765	1 ⊢ (𝜑 → (𝑆 splice ⟨𝐹, 𝑇, 𝑅⟩) = ((𝐴 ++ 𝑅) ++ 𝐶))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1540 ∈ wcel 2109 ⟨cop 4598 ⟨cotp 4600 ‘cfv 6514 (class class class)co 7390 0cc0 11075 + caddc 11078 ℕ₀cn0 12449 ℤ_≥cuz 12800 ...cfz 13475 ♯chash 14302 Word cword 14485 ++ cconcat 14542 substr csubstr 14612 prefix cpfx 14642 splice csplice 14721

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2702 ax-rep 5237 ax-sep 5254 ax-nul 5264 ax-pow 5323 ax-pr 5390 ax-un 7714 ax-cnex 11131 ax-resscn 11132 ax-1cn 11133 ax-icn 11134 ax-addcl 11135 ax-addrcl 11136 ax-mulcl 11137 ax-mulrcl 11138 ax-mulcom 11139 ax-addass 11140 ax-mulass 11141 ax-distr 11142 ax-i2m1 11143 ax-1ne0 11144 ax-1rid 11145 ax-rnegex 11146 ax-rrecex 11147 ax-cnre 11148 ax-pre-lttri 11149 ax-pre-lttrn 11150 ax-pre-ltadd 11151 ax-pre-mulgt0 11152

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-nel 3031 df-ral 3046 df-rex 3055 df-reu 3357 df-rab 3409 df-v 3452 df-sbc 3757 df-csb 3866 df-dif 3920 df-un 3922 df-in 3924 df-ss 3934 df-pss 3937 df-nul 4300 df-if 4492 df-pw 4568 df-sn 4593 df-pr 4595 df-op 4599 df-ot 4601 df-uni 4875 df-int 4914 df-iun 4960 df-br 5111 df-opab 5173 df-mpt 5192 df-tr 5218 df-id 5536 df-eprel 5541 df-po 5549 df-so 5550 df-fr 5594 df-we 5596 df-xp 5647 df-rel 5648 df-cnv 5649 df-co 5650 df-dm 5651 df-rn 5652 df-res 5653 df-ima 5654 df-pred 6277 df-ord 6338 df-on 6339 df-lim 6340 df-suc 6341 df-iota 6467 df-fun 6516 df-fn 6517 df-f 6518 df-f1 6519 df-fo 6520 df-f1o 6521 df-fv 6522 df-riota 7347 df-ov 7393 df-oprab 7394 df-mpo 7395 df-om 7846 df-1st 7971 df-2nd 7972 df-frecs 8263 df-wrecs 8294 df-recs 8343 df-rdg 8381 df-1o 8437 df-er 8674 df-en 8922 df-dom 8923 df-sdom 8924 df-fin 8925 df-card 9899 df-pnf 11217 df-mnf 11218 df-xr 11219 df-ltxr 11220 df-le 11221 df-sub 11414 df-neg 11415 df-nn 12194 df-n0 12450 df-z 12537 df-uz 12801 df-fz 13476 df-fzo 13623 df-hash 14303 df-word 14486 df-concat 14543 df-substr 14613 df-pfx 14643 df-splice 14722

This theorem is referenced by: efginvrel2 19664 efgredleme 19680 efgcpbllemb 19692 frgpnabllem1 19810

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