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Theorem ccatco 13432

Description: Mapping of words commutes with concatenation. (Contributed by Stefan O'Rear, 27-Aug-2015.)

**Assertion**
Ref	Expression
ccatco	⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → (𝐹 ∘ (𝑆 ++ 𝑇)) = ((𝐹 ∘ 𝑆) ++ (𝐹 ∘ 𝑇)))

Proof of Theorem ccatco Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		lenco 13429	. . . . . . 7 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → (#‘(𝐹 ∘ 𝑆)) = (#‘𝑆))
2	1	3adant2 1073	. . . . . 6 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → (#‘(𝐹 ∘ 𝑆)) = (#‘𝑆))
3		lenco 13429	. . . . . . 7 ⊢ ((𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → (#‘(𝐹 ∘ 𝑇)) = (#‘𝑇))
4	3	3adant1 1072	. . . . . 6 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → (#‘(𝐹 ∘ 𝑇)) = (#‘𝑇))
5	2, 4	oveq12d 6567	. . . . 5 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → ((#‘(𝐹 ∘ 𝑆)) + (#‘(𝐹 ∘ 𝑇))) = ((#‘𝑆) + (#‘𝑇)))
6	5	oveq2d 6565	. . . 4 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → (0..^((#‘(𝐹 ∘ 𝑆)) + (#‘(𝐹 ∘ 𝑇)))) = (0..^((#‘𝑆) + (#‘𝑇))))
7	6	mpteq1d 4666	. . 3 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → (𝑥 ∈ (0..^((#‘(𝐹 ∘ 𝑆)) + (#‘(𝐹 ∘ 𝑇)))) ↦ if(𝑥 ∈ (0..^(#‘(𝐹 ∘ 𝑆))), ((𝐹 ∘ 𝑆)‘𝑥), ((𝐹 ∘ 𝑇)‘(𝑥 − (#‘(𝐹 ∘ 𝑆)))))) = (𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇))) ↦ if(𝑥 ∈ (0..^(#‘(𝐹 ∘ 𝑆))), ((𝐹 ∘ 𝑆)‘𝑥), ((𝐹 ∘ 𝑇)‘(𝑥 − (#‘(𝐹 ∘ 𝑆)))))))
8	2	oveq2d 6565	. . . . . . . 8 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → (0..^(#‘(𝐹 ∘ 𝑆))) = (0..^(#‘𝑆)))
9	8	adantr 480	. . . . . . 7 ⊢ (((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) → (0..^(#‘(𝐹 ∘ 𝑆))) = (0..^(#‘𝑆)))
10	9	eleq2d 2673	. . . . . 6 ⊢ (((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) → (𝑥 ∈ (0..^(#‘(𝐹 ∘ 𝑆))) ↔ 𝑥 ∈ (0..^(#‘𝑆))))
11	10	ifbid 4058	. . . . 5 ⊢ (((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) → if(𝑥 ∈ (0..^(#‘(𝐹 ∘ 𝑆))), ((𝐹 ∘ 𝑆)‘𝑥), ((𝐹 ∘ 𝑇)‘(𝑥 − (#‘(𝐹 ∘ 𝑆))))) = if(𝑥 ∈ (0..^(#‘𝑆)), ((𝐹 ∘ 𝑆)‘𝑥), ((𝐹 ∘ 𝑇)‘(𝑥 − (#‘(𝐹 ∘ 𝑆))))))
12		wrdf 13165	. . . . . . . . . . 11 ⊢ (𝑆 ∈ Word 𝐴 → 𝑆:(0..^(#‘𝑆))⟶𝐴)
13	12	3ad2ant1 1075	. . . . . . . . . 10 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → 𝑆:(0..^(#‘𝑆))⟶𝐴)
14	13	adantr 480	. . . . . . . . 9 ⊢ (((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) → 𝑆:(0..^(#‘𝑆))⟶𝐴)
15		ffn 5958	. . . . . . . . 9 ⊢ (𝑆:(0..^(#‘𝑆))⟶𝐴 → 𝑆 Fn (0..^(#‘𝑆)))
16	14, 15	syl 17	. . . . . . . 8 ⊢ (((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) → 𝑆 Fn (0..^(#‘𝑆)))
17		fvco2 6183	. . . . . . . 8 ⊢ ((𝑆 Fn (0..^(#‘𝑆)) ∧ 𝑥 ∈ (0..^(#‘𝑆))) → ((𝐹 ∘ 𝑆)‘𝑥) = (𝐹‘(𝑆‘𝑥)))
18	16, 17	sylan 487	. . . . . . 7 ⊢ ((((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) ∧ 𝑥 ∈ (0..^(#‘𝑆))) → ((𝐹 ∘ 𝑆)‘𝑥) = (𝐹‘(𝑆‘𝑥)))
19		iftrue 4042	. . . . . . . 8 ⊢ (𝑥 ∈ (0..^(#‘𝑆)) → if(𝑥 ∈ (0..^(#‘𝑆)), (𝐹‘(𝑆‘𝑥)), (𝐹‘(𝑇‘(𝑥 − (#‘𝑆))))) = (𝐹‘(𝑆‘𝑥)))
20	19	adantl 481	. . . . . . 7 ⊢ ((((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) ∧ 𝑥 ∈ (0..^(#‘𝑆))) → if(𝑥 ∈ (0..^(#‘𝑆)), (𝐹‘(𝑆‘𝑥)), (𝐹‘(𝑇‘(𝑥 − (#‘𝑆))))) = (𝐹‘(𝑆‘𝑥)))
21	18, 20	eqtr4d 2647	. . . . . 6 ⊢ ((((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) ∧ 𝑥 ∈ (0..^(#‘𝑆))) → ((𝐹 ∘ 𝑆)‘𝑥) = if(𝑥 ∈ (0..^(#‘𝑆)), (𝐹‘(𝑆‘𝑥)), (𝐹‘(𝑇‘(𝑥 − (#‘𝑆))))))
22		wrdf 13165	. . . . . . . . . . 11 ⊢ (𝑇 ∈ Word 𝐴 → 𝑇:(0..^(#‘𝑇))⟶𝐴)
23	22	3ad2ant2 1076	. . . . . . . . . 10 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → 𝑇:(0..^(#‘𝑇))⟶𝐴)
24	23	ad2antrr 758	. . . . . . . . 9 ⊢ ((((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) ∧ ¬ 𝑥 ∈ (0..^(#‘𝑆))) → 𝑇:(0..^(#‘𝑇))⟶𝐴)
25		ffn 5958	. . . . . . . . 9 ⊢ (𝑇:(0..^(#‘𝑇))⟶𝐴 → 𝑇 Fn (0..^(#‘𝑇)))
26	24, 25	syl 17	. . . . . . . 8 ⊢ ((((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) ∧ ¬ 𝑥 ∈ (0..^(#‘𝑆))) → 𝑇 Fn (0..^(#‘𝑇)))
27		lencl 13179	. . . . . . . . . . . . 13 ⊢ (𝑆 ∈ Word 𝐴 → (#‘𝑆) ∈ ℕ₀)
28	27	nn0zd 11356	. . . . . . . . . . . 12 ⊢ (𝑆 ∈ Word 𝐴 → (#‘𝑆) ∈ ℤ)
29	28	3ad2ant1 1075	. . . . . . . . . . 11 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → (#‘𝑆) ∈ ℤ)
30		fzospliti 12369	. . . . . . . . . . . 12 ⊢ ((𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇))) ∧ (#‘𝑆) ∈ ℤ) → (𝑥 ∈ (0..^(#‘𝑆)) ∨ 𝑥 ∈ ((#‘𝑆)..^((#‘𝑆) + (#‘𝑇)))))
31	30	ancoms 468	. . . . . . . . . . 11 ⊢ (((#‘𝑆) ∈ ℤ ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) → (𝑥 ∈ (0..^(#‘𝑆)) ∨ 𝑥 ∈ ((#‘𝑆)..^((#‘𝑆) + (#‘𝑇)))))
32	29, 31	sylan 487	. . . . . . . . . 10 ⊢ (((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) → (𝑥 ∈ (0..^(#‘𝑆)) ∨ 𝑥 ∈ ((#‘𝑆)..^((#‘𝑆) + (#‘𝑇)))))
33	32	orcanai 950	. . . . . . . . 9 ⊢ ((((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) ∧ ¬ 𝑥 ∈ (0..^(#‘𝑆))) → 𝑥 ∈ ((#‘𝑆)..^((#‘𝑆) + (#‘𝑇))))
34		lencl 13179	. . . . . . . . . . . 12 ⊢ (𝑇 ∈ Word 𝐴 → (#‘𝑇) ∈ ℕ₀)
35	34	nn0zd 11356	. . . . . . . . . . 11 ⊢ (𝑇 ∈ Word 𝐴 → (#‘𝑇) ∈ ℤ)
36	35	3ad2ant2 1076	. . . . . . . . . 10 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → (#‘𝑇) ∈ ℤ)
37	36	ad2antrr 758	. . . . . . . . 9 ⊢ ((((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) ∧ ¬ 𝑥 ∈ (0..^(#‘𝑆))) → (#‘𝑇) ∈ ℤ)
38		fzosubel3 12396	. . . . . . . . 9 ⊢ ((𝑥 ∈ ((#‘𝑆)..^((#‘𝑆) + (#‘𝑇))) ∧ (#‘𝑇) ∈ ℤ) → (𝑥 − (#‘𝑆)) ∈ (0..^(#‘𝑇)))
39	33, 37, 38	syl2anc 691	. . . . . . . 8 ⊢ ((((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) ∧ ¬ 𝑥 ∈ (0..^(#‘𝑆))) → (𝑥 − (#‘𝑆)) ∈ (0..^(#‘𝑇)))
40		fvco2 6183	. . . . . . . 8 ⊢ ((𝑇 Fn (0..^(#‘𝑇)) ∧ (𝑥 − (#‘𝑆)) ∈ (0..^(#‘𝑇))) → ((𝐹 ∘ 𝑇)‘(𝑥 − (#‘𝑆))) = (𝐹‘(𝑇‘(𝑥 − (#‘𝑆)))))
41	26, 39, 40	syl2anc 691	. . . . . . 7 ⊢ ((((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) ∧ ¬ 𝑥 ∈ (0..^(#‘𝑆))) → ((𝐹 ∘ 𝑇)‘(𝑥 − (#‘𝑆))) = (𝐹‘(𝑇‘(𝑥 − (#‘𝑆)))))
42	2	oveq2d 6565	. . . . . . . . 9 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → (𝑥 − (#‘(𝐹 ∘ 𝑆))) = (𝑥 − (#‘𝑆)))
43	42	fveq2d 6107	. . . . . . . 8 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → ((𝐹 ∘ 𝑇)‘(𝑥 − (#‘(𝐹 ∘ 𝑆)))) = ((𝐹 ∘ 𝑇)‘(𝑥 − (#‘𝑆))))
44	43	ad2antrr 758	. . . . . . 7 ⊢ ((((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) ∧ ¬ 𝑥 ∈ (0..^(#‘𝑆))) → ((𝐹 ∘ 𝑇)‘(𝑥 − (#‘(𝐹 ∘ 𝑆)))) = ((𝐹 ∘ 𝑇)‘(𝑥 − (#‘𝑆))))
45		iffalse 4045	. . . . . . . 8 ⊢ (¬ 𝑥 ∈ (0..^(#‘𝑆)) → if(𝑥 ∈ (0..^(#‘𝑆)), (𝐹‘(𝑆‘𝑥)), (𝐹‘(𝑇‘(𝑥 − (#‘𝑆))))) = (𝐹‘(𝑇‘(𝑥 − (#‘𝑆)))))
46	45	adantl 481	. . . . . . 7 ⊢ ((((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) ∧ ¬ 𝑥 ∈ (0..^(#‘𝑆))) → if(𝑥 ∈ (0..^(#‘𝑆)), (𝐹‘(𝑆‘𝑥)), (𝐹‘(𝑇‘(𝑥 − (#‘𝑆))))) = (𝐹‘(𝑇‘(𝑥 − (#‘𝑆)))))
47	41, 44, 46	3eqtr4d 2654	. . . . . 6 ⊢ ((((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) ∧ ¬ 𝑥 ∈ (0..^(#‘𝑆))) → ((𝐹 ∘ 𝑇)‘(𝑥 − (#‘(𝐹 ∘ 𝑆)))) = if(𝑥 ∈ (0..^(#‘𝑆)), (𝐹‘(𝑆‘𝑥)), (𝐹‘(𝑇‘(𝑥 − (#‘𝑆))))))
48	21, 47	ifeqda 4071	. . . . 5 ⊢ (((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) → if(𝑥 ∈ (0..^(#‘𝑆)), ((𝐹 ∘ 𝑆)‘𝑥), ((𝐹 ∘ 𝑇)‘(𝑥 − (#‘(𝐹 ∘ 𝑆))))) = if(𝑥 ∈ (0..^(#‘𝑆)), (𝐹‘(𝑆‘𝑥)), (𝐹‘(𝑇‘(𝑥 − (#‘𝑆))))))
49	11, 48	eqtrd 2644	. . . 4 ⊢ (((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) → if(𝑥 ∈ (0..^(#‘(𝐹 ∘ 𝑆))), ((𝐹 ∘ 𝑆)‘𝑥), ((𝐹 ∘ 𝑇)‘(𝑥 − (#‘(𝐹 ∘ 𝑆))))) = if(𝑥 ∈ (0..^(#‘𝑆)), (𝐹‘(𝑆‘𝑥)), (𝐹‘(𝑇‘(𝑥 − (#‘𝑆))))))
50	49	mpteq2dva 4672	. . 3 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → (𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇))) ↦ if(𝑥 ∈ (0..^(#‘(𝐹 ∘ 𝑆))), ((𝐹 ∘ 𝑆)‘𝑥), ((𝐹 ∘ 𝑇)‘(𝑥 − (#‘(𝐹 ∘ 𝑆)))))) = (𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇))) ↦ if(𝑥 ∈ (0..^(#‘𝑆)), (𝐹‘(𝑆‘𝑥)), (𝐹‘(𝑇‘(𝑥 − (#‘𝑆)))))))
51	7, 50	eqtr2d 2645	. 2 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → (𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇))) ↦ if(𝑥 ∈ (0..^(#‘𝑆)), (𝐹‘(𝑆‘𝑥)), (𝐹‘(𝑇‘(𝑥 − (#‘𝑆)))))) = (𝑥 ∈ (0..^((#‘(𝐹 ∘ 𝑆)) + (#‘(𝐹 ∘ 𝑇)))) ↦ if(𝑥 ∈ (0..^(#‘(𝐹 ∘ 𝑆))), ((𝐹 ∘ 𝑆)‘𝑥), ((𝐹 ∘ 𝑇)‘(𝑥 − (#‘(𝐹 ∘ 𝑆)))))))
52	14	ffvelrnda 6267	. . . 4 ⊢ ((((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) ∧ 𝑥 ∈ (0..^(#‘𝑆))) → (𝑆‘𝑥) ∈ 𝐴)
53	24, 39	ffvelrnd 6268	. . . 4 ⊢ ((((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) ∧ ¬ 𝑥 ∈ (0..^(#‘𝑆))) → (𝑇‘(𝑥 − (#‘𝑆))) ∈ 𝐴)
54	52, 53	ifclda 4070	. . 3 ⊢ (((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) ∧ 𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇)))) → if(𝑥 ∈ (0..^(#‘𝑆)), (𝑆‘𝑥), (𝑇‘(𝑥 − (#‘𝑆)))) ∈ 𝐴)
55		ccatfval 13211	. . . 4 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴) → (𝑆 ++ 𝑇) = (𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇))) ↦ if(𝑥 ∈ (0..^(#‘𝑆)), (𝑆‘𝑥), (𝑇‘(𝑥 − (#‘𝑆))))))
56	55	3adant3 1074	. . 3 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → (𝑆 ++ 𝑇) = (𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇))) ↦ if(𝑥 ∈ (0..^(#‘𝑆)), (𝑆‘𝑥), (𝑇‘(𝑥 − (#‘𝑆))))))
57		simp3 1056	. . . 4 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → 𝐹:𝐴⟶𝐵)
58	57	feqmptd 6159	. . 3 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → 𝐹 = (𝑦 ∈ 𝐴 ↦ (𝐹‘𝑦)))
59		fveq2 6103	. . . 4 ⊢ (𝑦 = if(𝑥 ∈ (0..^(#‘𝑆)), (𝑆‘𝑥), (𝑇‘(𝑥 − (#‘𝑆)))) → (𝐹‘𝑦) = (𝐹‘if(𝑥 ∈ (0..^(#‘𝑆)), (𝑆‘𝑥), (𝑇‘(𝑥 − (#‘𝑆))))))
60		fvif 6114	. . . 4 ⊢ (𝐹‘if(𝑥 ∈ (0..^(#‘𝑆)), (𝑆‘𝑥), (𝑇‘(𝑥 − (#‘𝑆))))) = if(𝑥 ∈ (0..^(#‘𝑆)), (𝐹‘(𝑆‘𝑥)), (𝐹‘(𝑇‘(𝑥 − (#‘𝑆)))))
61	59, 60	syl6eq 2660	. . 3 ⊢ (𝑦 = if(𝑥 ∈ (0..^(#‘𝑆)), (𝑆‘𝑥), (𝑇‘(𝑥 − (#‘𝑆)))) → (𝐹‘𝑦) = if(𝑥 ∈ (0..^(#‘𝑆)), (𝐹‘(𝑆‘𝑥)), (𝐹‘(𝑇‘(𝑥 − (#‘𝑆))))))
62	54, 56, 58, 61	fmptco 6303	. 2 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → (𝐹 ∘ (𝑆 ++ 𝑇)) = (𝑥 ∈ (0..^((#‘𝑆) + (#‘𝑇))) ↦ if(𝑥 ∈ (0..^(#‘𝑆)), (𝐹‘(𝑆‘𝑥)), (𝐹‘(𝑇‘(𝑥 − (#‘𝑆)))))))
63		ffun 5961	. . . . 5 ⊢ (𝐹:𝐴⟶𝐵 → Fun 𝐹)
64	63	3ad2ant3 1077	. . . 4 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → Fun 𝐹)
65		simp1 1054	. . . 4 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → 𝑆 ∈ Word 𝐴)
66		cofunexg 7023	. . . 4 ⊢ ((Fun 𝐹 ∧ 𝑆 ∈ Word 𝐴) → (𝐹 ∘ 𝑆) ∈ V)
67	64, 65, 66	syl2anc 691	. . 3 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → (𝐹 ∘ 𝑆) ∈ V)
68		simp2 1055	. . . 4 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → 𝑇 ∈ Word 𝐴)
69		cofunexg 7023	. . . 4 ⊢ ((Fun 𝐹 ∧ 𝑇 ∈ Word 𝐴) → (𝐹 ∘ 𝑇) ∈ V)
70	64, 68, 69	syl2anc 691	. . 3 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → (𝐹 ∘ 𝑇) ∈ V)
71		ccatfval 13211	. . 3 ⊢ (((𝐹 ∘ 𝑆) ∈ V ∧ (𝐹 ∘ 𝑇) ∈ V) → ((𝐹 ∘ 𝑆) ++ (𝐹 ∘ 𝑇)) = (𝑥 ∈ (0..^((#‘(𝐹 ∘ 𝑆)) + (#‘(𝐹 ∘ 𝑇)))) ↦ if(𝑥 ∈ (0..^(#‘(𝐹 ∘ 𝑆))), ((𝐹 ∘ 𝑆)‘𝑥), ((𝐹 ∘ 𝑇)‘(𝑥 − (#‘(𝐹 ∘ 𝑆)))))))
72	67, 70, 71	syl2anc 691	. 2 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → ((𝐹 ∘ 𝑆) ++ (𝐹 ∘ 𝑇)) = (𝑥 ∈ (0..^((#‘(𝐹 ∘ 𝑆)) + (#‘(𝐹 ∘ 𝑇)))) ↦ if(𝑥 ∈ (0..^(#‘(𝐹 ∘ 𝑆))), ((𝐹 ∘ 𝑆)‘𝑥), ((𝐹 ∘ 𝑇)‘(𝑥 − (#‘(𝐹 ∘ 𝑆)))))))
73	51, 62, 72	3eqtr4d 2654	1 ⊢ ((𝑆 ∈ Word 𝐴 ∧ 𝑇 ∈ Word 𝐴 ∧ 𝐹:𝐴⟶𝐵) → (𝐹 ∘ (𝑆 ++ 𝑇)) = ((𝐹 ∘ 𝑆) ++ (𝐹 ∘ 𝑇)))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∨ wo 382 ∧ wa 383 ∧ w3a 1031 = wceq 1475 ∈ wcel 1977 Vcvv 3173 ifcif 4036 ↦ cmpt 4643 ∘ ccom 5042 Fun wfun 5798 Fn wfn 5799 ⟶wf 5800 ‘cfv 5804 (class class class)co 6549 0cc0 9815 + caddc 9818 − cmin 10145 ℤcz 11254 ..^cfzo 12334 #chash 12979 Word cword 13146 ++ cconcat 13148

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-z 11255 df-uz 11564 df-fz 12198 df-fzo 12335 df-hash 12980 df-word 13154 df-concat 13156

This theorem is referenced by: cats1co 13452 frmdgsum 17222 frmdup1 17224 efginvrel2 17963 frgpuplem 18008 frgpup1 18011 mrsubccat 30669

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