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Theorem splval2 14659

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 14476	. . . . . 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 14476	. . . . 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 2831	. . 3 ⊢ (𝜑 → 𝑆 ∈ Word 𝑋)
10		splval2.f	. . . 4 ⊢ (𝜑 → 𝐹 = (♯‘𝐴))
11		lencl 14435	. . . . 5 ⊢ (𝐴 ∈ Word 𝑋 → (♯‘𝐴) ∈ ℕ₀)
12	2, 11	syl 17	. . . 4 ⊢ (𝜑 → (♯‘𝐴) ∈ ℕ₀)
13	10, 12	eqeltrd 2831	. . 3 ⊢ (𝜑 → 𝐹 ∈ ℕ₀)
14		splval2.t	. . . 4 ⊢ (𝜑 → 𝑇 = (𝐹 + (♯‘𝐵)))
15		lencl 14435	. . . . . 6 ⊢ (𝐵 ∈ Word 𝑋 → (♯‘𝐵) ∈ ℕ₀)
16	3, 15	syl 17	. . . . 5 ⊢ (𝜑 → (♯‘𝐵) ∈ ℕ₀)
17	13, 16	nn0addcld 12441	. . . 4 ⊢ (𝜑 → (𝐹 + (♯‘𝐵)) ∈ ℕ₀)
18	14, 17	eqeltrd 2831	. . 3 ⊢ (𝜑 → 𝑇 ∈ ℕ₀)
19		splval2.r	. . 3 ⊢ (𝜑 → 𝑅 ∈ Word 𝑋)
20		splval 14653	. . 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 12769	. . . . . . . . . 10 ⊢ ℕ₀ = (ℤ_≥‘0)
23	13, 22	eleqtrdi 2841	. . . . . . . . 9 ⊢ (𝜑 → 𝐹 ∈ (ℤ_≥‘0))
24	13	nn0zd 12489	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝐹 ∈ ℤ)
25	24	uzidd 12743	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐹 ∈ (ℤ_≥‘𝐹))
26		uzaddcl 12797	. . . . . . . . . . 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 2831	. . . . . . . . 9 ⊢ (𝜑 → 𝑇 ∈ (ℤ_≥‘𝐹))
29		elfzuzb 13413	. . . . . . . . 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 2841	. . . . . . . . 9 ⊢ (𝜑 → 𝑇 ∈ (ℤ_≥‘0))
32		ccatlen 14477	. . . . . . . . . . . 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 6821	. . . . . . . . . . 11 ⊢ (𝜑 → (♯‘𝑆) = (♯‘((𝐴 ++ 𝐵) ++ 𝐶)))
35	10	oveq1d 7356	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝐹 + (♯‘𝐵)) = ((♯‘𝐴) + (♯‘𝐵)))
36		ccatlen 14477	. . . . . . . . . . . . . 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 2776	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑇 = (♯‘(𝐴 ++ 𝐵)))
39	38	oveq1d 7356	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑇 + (♯‘𝐶)) = ((♯‘(𝐴 ++ 𝐵)) + (♯‘𝐶)))
40	33, 34, 39	3eqtr4d 2776	. . . . . . . . . 10 ⊢ (𝜑 → (♯‘𝑆) = (𝑇 + (♯‘𝐶)))
41	18	nn0zd 12489	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑇 ∈ ℤ)
42	41	uzidd 12743	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑇 ∈ (ℤ_≥‘𝑇))
43		lencl 14435	. . . . . . . . . . . 12 ⊢ (𝐶 ∈ Word 𝑋 → (♯‘𝐶) ∈ ℕ₀)
44	6, 43	syl 17	. . . . . . . . . . 11 ⊢ (𝜑 → (♯‘𝐶) ∈ ℕ₀)
45		uzaddcl 12797	. . . . . . . . . . 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 2831	. . . . . . . . 9 ⊢ (𝜑 → (♯‘𝑆) ∈ (ℤ_≥‘𝑇))
48		elfzuzb 13413	. . . . . . . . 9 ⊢ (𝑇 ∈ (0...(♯‘𝑆)) ↔ (𝑇 ∈ (ℤ_≥‘0) ∧ (♯‘𝑆) ∈ (ℤ_≥‘𝑇)))
49	31, 47, 48	sylanbrc 583	. . . . . . . 8 ⊢ (𝜑 → 𝑇 ∈ (0...(♯‘𝑆)))
50		ccatpfx 14603	. . . . . . . 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 14435	. . . . . . . . . . . . . 14 ⊢ (𝑆 ∈ Word 𝑋 → (♯‘𝑆) ∈ ℕ₀)
53	9, 52	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → (♯‘𝑆) ∈ ℕ₀)
54	53, 22	eleqtrdi 2841	. . . . . . . . . . . 12 ⊢ (𝜑 → (♯‘𝑆) ∈ (ℤ_≥‘0))
55		eluzfz2 13427	. . . . . . . . . . . 12 ⊢ ((♯‘𝑆) ∈ (ℤ_≥‘0) → (♯‘𝑆) ∈ (0...(♯‘𝑆)))
56	54, 55	syl 17	. . . . . . . . . . 11 ⊢ (𝜑 → (♯‘𝑆) ∈ (0...(♯‘𝑆)))
57		ccatpfx 14603	. . . . . . . . . . 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 14587	. . . . . . . . . . 11 ⊢ (𝑆 ∈ Word 𝑋 → (𝑆 prefix (♯‘𝑆)) = 𝑆)
60	9, 59	syl 17	. . . . . . . . . 10 ⊢ (𝜑 → (𝑆 prefix (♯‘𝑆)) = 𝑆)
61	58, 60, 1	3eqtrd 2770	. . . . . . . . 9 ⊢ (𝜑 → ((𝑆 prefix 𝑇) ++ (𝑆 substr ⟨𝑇, (♯‘𝑆)⟩)) = ((𝐴 ++ 𝐵) ++ 𝐶))
62		pfxcl 14580	. . . . . . . . . . 11 ⊢ (𝑆 ∈ Word 𝑋 → (𝑆 prefix 𝑇) ∈ Word 𝑋)
63	9, 62	syl 17	. . . . . . . . . 10 ⊢ (𝜑 → (𝑆 prefix 𝑇) ∈ Word 𝑋)
64		swrdcl 14548	. . . . . . . . . . 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 14586	. . . . . . . . . . . 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 2766	. . . . . . . . . 10 ⊢ (𝜑 → (♯‘(𝑆 prefix 𝑇)) = (♯‘(𝐴 ++ 𝐵)))
69		ccatopth 14618	. . . . . . . . . 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 2766	. . . . . 6 ⊢ (𝜑 → ((𝑆 prefix 𝐹) ++ (𝑆 substr ⟨𝐹, 𝑇⟩)) = (𝐴 ++ 𝐵))
74		pfxcl 14580	. . . . . . . 8 ⊢ (𝑆 ∈ Word 𝑋 → (𝑆 prefix 𝐹) ∈ Word 𝑋)
75	9, 74	syl 17	. . . . . . 7 ⊢ (𝜑 → (𝑆 prefix 𝐹) ∈ Word 𝑋)
76		swrdcl 14548	. . . . . . . 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 12745	. . . . . . . . . . 11 ⊢ (((♯‘𝑆) ∈ (ℤ_≥‘𝑇) ∧ 𝑇 ∈ (ℤ_≥‘𝐹)) → (♯‘𝑆) ∈ (ℤ_≥‘𝐹))
79	47, 28, 78	syl2anc 584	. . . . . . . . . 10 ⊢ (𝜑 → (♯‘𝑆) ∈ (ℤ_≥‘𝐹))
80		elfzuzb 13413	. . . . . . . . . 10 ⊢ (𝐹 ∈ (0...(♯‘𝑆)) ↔ (𝐹 ∈ (ℤ_≥‘0) ∧ (♯‘𝑆) ∈ (ℤ_≥‘𝐹)))
81	23, 79, 80	sylanbrc 583	. . . . . . . . 9 ⊢ (𝜑 → 𝐹 ∈ (0...(♯‘𝑆)))
82		pfxlen 14586	. . . . . . . . 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 2766	. . . . . . 7 ⊢ (𝜑 → (♯‘(𝑆 prefix 𝐹)) = (♯‘𝐴))
85		ccatopth 14618	. . . . . . 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 7356	. . 3 ⊢ (𝜑 → ((𝑆 prefix 𝐹) ++ 𝑅) = (𝐴 ++ 𝑅))
90	71	simprd 495	. . 3 ⊢ (𝜑 → (𝑆 substr ⟨𝑇, (♯‘𝑆)⟩) = 𝐶)
91	89, 90	oveq12d 7359	. 2 ⊢ (𝜑 → (((𝑆 prefix 𝐹) ++ 𝑅) ++ (𝑆 substr ⟨𝑇, (♯‘𝑆)⟩)) = ((𝐴 ++ 𝑅) ++ 𝐶))
92	21, 91	eqtrd 2766	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 1541 ∈ wcel 2111 ⟨cop 4577 ⟨cotp 4579 ‘cfv 6476 (class class class)co 7341 0cc0 11001 + caddc 11004 ℕ₀cn0 12376 ℤ_≥cuz 12727 ...cfz 13402 ♯chash 14232 Word cword 14415 ++ cconcat 14472 substr csubstr 14543 prefix cpfx 14573 splice csplice 14651

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-rep 5212 ax-sep 5229 ax-nul 5239 ax-pow 5298 ax-pr 5365 ax-un 7663 ax-cnex 11057 ax-resscn 11058 ax-1cn 11059 ax-icn 11060 ax-addcl 11061 ax-addrcl 11062 ax-mulcl 11063 ax-mulrcl 11064 ax-mulcom 11065 ax-addass 11066 ax-mulass 11067 ax-distr 11068 ax-i2m1 11069 ax-1ne0 11070 ax-1rid 11071 ax-rnegex 11072 ax-rrecex 11073 ax-cnre 11074 ax-pre-lttri 11075 ax-pre-lttrn 11076 ax-pre-ltadd 11077 ax-pre-mulgt0 11078

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3737 df-csb 3846 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-pss 3917 df-nul 4279 df-if 4471 df-pw 4547 df-sn 4572 df-pr 4574 df-op 4578 df-ot 4580 df-uni 4855 df-int 4893 df-iun 4938 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5506 df-eprel 5511 df-po 5519 df-so 5520 df-fr 5564 df-we 5566 df-xp 5617 df-rel 5618 df-cnv 5619 df-co 5620 df-dm 5621 df-rn 5622 df-res 5623 df-ima 5624 df-pred 6243 df-ord 6304 df-on 6305 df-lim 6306 df-suc 6307 df-iota 6432 df-fun 6478 df-fn 6479 df-f 6480 df-f1 6481 df-fo 6482 df-f1o 6483 df-fv 6484 df-riota 7298 df-ov 7344 df-oprab 7345 df-mpo 7346 df-om 7792 df-1st 7916 df-2nd 7917 df-frecs 8206 df-wrecs 8237 df-recs 8286 df-rdg 8324 df-1o 8380 df-er 8617 df-en 8865 df-dom 8866 df-sdom 8867 df-fin 8868 df-card 9827 df-pnf 11143 df-mnf 11144 df-xr 11145 df-ltxr 11146 df-le 11147 df-sub 11341 df-neg 11342 df-nn 12121 df-n0 12377 df-z 12464 df-uz 12728 df-fz 13403 df-fzo 13550 df-hash 14233 df-word 14416 df-concat 14473 df-substr 14544 df-pfx 14574 df-splice 14652

This theorem is referenced by: efginvrel2 19634 efgredleme 19650 efgcpbllemb 19662 frgpnabllem1 19780

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