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Theorem mbfmul 25607

Description: The product of two measurable functions is measurable. (Contributed by Mario Carneiro, 7-Sep-2014.)

**Hypotheses**
Ref	Expression
mbfmul.1	⊢ (𝜑 → 𝐹 ∈ MblFn)
mbfmul.2	⊢ (𝜑 → 𝐺 ∈ MblFn)

**Assertion**
Ref	Expression
mbfmul	⊢ (𝜑 → (𝐹 ∘_f · 𝐺) ∈ MblFn)

Proof of Theorem mbfmul Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		mbfmul.1	. . . . 5 ⊢ (𝜑 → 𝐹 ∈ MblFn)
2		mbff 25505	. . . . 5 ⊢ (𝐹 ∈ MblFn → 𝐹:dom 𝐹⟶ℂ)
3	1, 2	syl 17	. . . 4 ⊢ (𝜑 → 𝐹:dom 𝐹⟶ℂ)
4	3	ffnd 6711	. . 3 ⊢ (𝜑 → 𝐹 Fn dom 𝐹)
5		mbfmul.2	. . . . 5 ⊢ (𝜑 → 𝐺 ∈ MblFn)
6		mbff 25505	. . . . 5 ⊢ (𝐺 ∈ MblFn → 𝐺:dom 𝐺⟶ℂ)
7	5, 6	syl 17	. . . 4 ⊢ (𝜑 → 𝐺:dom 𝐺⟶ℂ)
8	7	ffnd 6711	. . 3 ⊢ (𝜑 → 𝐺 Fn dom 𝐺)
9		mbfdm 25506	. . . 4 ⊢ (𝐹 ∈ MblFn → dom 𝐹 ∈ dom vol)
10	1, 9	syl 17	. . 3 ⊢ (𝜑 → dom 𝐹 ∈ dom vol)
11		mbfdm 25506	. . . 4 ⊢ (𝐺 ∈ MblFn → dom 𝐺 ∈ dom vol)
12	5, 11	syl 17	. . 3 ⊢ (𝜑 → dom 𝐺 ∈ dom vol)
13		eqid 2726	. . 3 ⊢ (dom 𝐹 ∩ dom 𝐺) = (dom 𝐹 ∩ dom 𝐺)
14		eqidd 2727	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ dom 𝐹) → (𝐹‘𝑥) = (𝐹‘𝑥))
15		eqidd 2727	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ dom 𝐺) → (𝐺‘𝑥) = (𝐺‘𝑥))
16	4, 8, 10, 12, 13, 14, 15	offval 7675	. 2 ⊢ (𝜑 → (𝐹 ∘_f · 𝐺) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ ((𝐹‘𝑥) · (𝐺‘𝑥))))
17		elinel1 4190	. . . . . . . 8 ⊢ (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) → 𝑥 ∈ dom 𝐹)
18		ffvelcdm 7076	. . . . . . . 8 ⊢ ((𝐹:dom 𝐹⟶ℂ ∧ 𝑥 ∈ dom 𝐹) → (𝐹‘𝑥) ∈ ℂ)
19	3, 17, 18	syl2an 595	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (dom 𝐹 ∩ dom 𝐺)) → (𝐹‘𝑥) ∈ ℂ)
20		elinel2 4191	. . . . . . . 8 ⊢ (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) → 𝑥 ∈ dom 𝐺)
21		ffvelcdm 7076	. . . . . . . 8 ⊢ ((𝐺:dom 𝐺⟶ℂ ∧ 𝑥 ∈ dom 𝐺) → (𝐺‘𝑥) ∈ ℂ)
22	7, 20, 21	syl2an 595	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (dom 𝐹 ∩ dom 𝐺)) → (𝐺‘𝑥) ∈ ℂ)
23	19, 22	remuld 15169	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (dom 𝐹 ∩ dom 𝐺)) → (ℜ‘((𝐹‘𝑥) · (𝐺‘𝑥))) = (((ℜ‘(𝐹‘𝑥)) · (ℜ‘(𝐺‘𝑥))) − ((ℑ‘(𝐹‘𝑥)) · (ℑ‘(𝐺‘𝑥)))))
24	23	mpteq2dva 5241	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘((𝐹‘𝑥) · (𝐺‘𝑥)))) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (((ℜ‘(𝐹‘𝑥)) · (ℜ‘(𝐺‘𝑥))) − ((ℑ‘(𝐹‘𝑥)) · (ℑ‘(𝐺‘𝑥))))))
25		inmbl 25422	. . . . . . 7 ⊢ ((dom 𝐹 ∈ dom vol ∧ dom 𝐺 ∈ dom vol) → (dom 𝐹 ∩ dom 𝐺) ∈ dom vol)
26	10, 12, 25	syl2anc 583	. . . . . 6 ⊢ (𝜑 → (dom 𝐹 ∩ dom 𝐺) ∈ dom vol)
27		ovexd 7439	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (dom 𝐹 ∩ dom 𝐺)) → ((ℜ‘(𝐹‘𝑥)) · (ℜ‘(𝐺‘𝑥))) ∈ V)
28		ovexd 7439	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (dom 𝐹 ∩ dom 𝐺)) → ((ℑ‘(𝐹‘𝑥)) · (ℑ‘(𝐺‘𝑥))) ∈ V)
29	19	recld 15145	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (dom 𝐹 ∩ dom 𝐺)) → (ℜ‘(𝐹‘𝑥)) ∈ ℝ)
30	22	recld 15145	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (dom 𝐹 ∩ dom 𝐺)) → (ℜ‘(𝐺‘𝑥)) ∈ ℝ)
31		eqidd 2727	. . . . . . 7 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐹‘𝑥))) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐹‘𝑥))))
32		eqidd 2727	. . . . . . 7 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐺‘𝑥))) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐺‘𝑥))))
33	26, 29, 30, 31, 32	offval2 7686	. . . . . 6 ⊢ (𝜑 → ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐺‘𝑥)))) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ ((ℜ‘(𝐹‘𝑥)) · (ℜ‘(𝐺‘𝑥)))))
34	19	imcld 15146	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (dom 𝐹 ∩ dom 𝐺)) → (ℑ‘(𝐹‘𝑥)) ∈ ℝ)
35	22	imcld 15146	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (dom 𝐹 ∩ dom 𝐺)) → (ℑ‘(𝐺‘𝑥)) ∈ ℝ)
36		eqidd 2727	. . . . . . 7 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐹‘𝑥))) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐹‘𝑥))))
37		eqidd 2727	. . . . . . 7 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐺‘𝑥))) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐺‘𝑥))))
38	26, 34, 35, 36, 37	offval2 7686	. . . . . 6 ⊢ (𝜑 → ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐺‘𝑥)))) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ ((ℑ‘(𝐹‘𝑥)) · (ℑ‘(𝐺‘𝑥)))))
39	26, 27, 28, 33, 38	offval2 7686	. . . . 5 ⊢ (𝜑 → (((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐺‘𝑥)))) ∘_f − ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐺‘𝑥))))) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (((ℜ‘(𝐹‘𝑥)) · (ℜ‘(𝐺‘𝑥))) − ((ℑ‘(𝐹‘𝑥)) · (ℑ‘(𝐺‘𝑥))))))
40	24, 39	eqtr4d 2769	. . . 4 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘((𝐹‘𝑥) · (𝐺‘𝑥)))) = (((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐺‘𝑥)))) ∘_f − ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐺‘𝑥))))))
41		inss1 4223	. . . . . . . . . 10 ⊢ (dom 𝐹 ∩ dom 𝐺) ⊆ dom 𝐹
42		resmpt 6030	. . . . . . . . . 10 ⊢ ((dom 𝐹 ∩ dom 𝐺) ⊆ dom 𝐹 → ((𝑥 ∈ dom 𝐹 ↦ (𝐹‘𝑥)) ↾ (dom 𝐹 ∩ dom 𝐺)) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (𝐹‘𝑥)))
43	41, 42	ax-mp 5	. . . . . . . . 9 ⊢ ((𝑥 ∈ dom 𝐹 ↦ (𝐹‘𝑥)) ↾ (dom 𝐹 ∩ dom 𝐺)) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (𝐹‘𝑥))
44	3	feqmptd 6953	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐹 = (𝑥 ∈ dom 𝐹 ↦ (𝐹‘𝑥)))
45	44, 1	eqeltrrd 2828	. . . . . . . . . 10 ⊢ (𝜑 → (𝑥 ∈ dom 𝐹 ↦ (𝐹‘𝑥)) ∈ MblFn)
46		mbfres 25524	. . . . . . . . . 10 ⊢ (((𝑥 ∈ dom 𝐹 ↦ (𝐹‘𝑥)) ∈ MblFn ∧ (dom 𝐹 ∩ dom 𝐺) ∈ dom vol) → ((𝑥 ∈ dom 𝐹 ↦ (𝐹‘𝑥)) ↾ (dom 𝐹 ∩ dom 𝐺)) ∈ MblFn)
47	45, 26, 46	syl2anc 583	. . . . . . . . 9 ⊢ (𝜑 → ((𝑥 ∈ dom 𝐹 ↦ (𝐹‘𝑥)) ↾ (dom 𝐹 ∩ dom 𝐺)) ∈ MblFn)
48	43, 47	eqeltrrid 2832	. . . . . . . 8 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (𝐹‘𝑥)) ∈ MblFn)
49	19	ismbfcn2 25518	. . . . . . . 8 ⊢ (𝜑 → ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (𝐹‘𝑥)) ∈ MblFn ↔ ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐹‘𝑥))) ∈ MblFn ∧ (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐹‘𝑥))) ∈ MblFn)))
50	48, 49	mpbid 231	. . . . . . 7 ⊢ (𝜑 → ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐹‘𝑥))) ∈ MblFn ∧ (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐹‘𝑥))) ∈ MblFn))
51	50	simpld 494	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐹‘𝑥))) ∈ MblFn)
52		inss2 4224	. . . . . . . . . 10 ⊢ (dom 𝐹 ∩ dom 𝐺) ⊆ dom 𝐺
53		resmpt 6030	. . . . . . . . . 10 ⊢ ((dom 𝐹 ∩ dom 𝐺) ⊆ dom 𝐺 → ((𝑥 ∈ dom 𝐺 ↦ (𝐺‘𝑥)) ↾ (dom 𝐹 ∩ dom 𝐺)) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (𝐺‘𝑥)))
54	52, 53	ax-mp 5	. . . . . . . . 9 ⊢ ((𝑥 ∈ dom 𝐺 ↦ (𝐺‘𝑥)) ↾ (dom 𝐹 ∩ dom 𝐺)) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (𝐺‘𝑥))
55	7	feqmptd 6953	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐺 = (𝑥 ∈ dom 𝐺 ↦ (𝐺‘𝑥)))
56	55, 5	eqeltrrd 2828	. . . . . . . . . 10 ⊢ (𝜑 → (𝑥 ∈ dom 𝐺 ↦ (𝐺‘𝑥)) ∈ MblFn)
57		mbfres 25524	. . . . . . . . . 10 ⊢ (((𝑥 ∈ dom 𝐺 ↦ (𝐺‘𝑥)) ∈ MblFn ∧ (dom 𝐹 ∩ dom 𝐺) ∈ dom vol) → ((𝑥 ∈ dom 𝐺 ↦ (𝐺‘𝑥)) ↾ (dom 𝐹 ∩ dom 𝐺)) ∈ MblFn)
58	56, 26, 57	syl2anc 583	. . . . . . . . 9 ⊢ (𝜑 → ((𝑥 ∈ dom 𝐺 ↦ (𝐺‘𝑥)) ↾ (dom 𝐹 ∩ dom 𝐺)) ∈ MblFn)
59	54, 58	eqeltrrid 2832	. . . . . . . 8 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (𝐺‘𝑥)) ∈ MblFn)
60	22	ismbfcn2 25518	. . . . . . . 8 ⊢ (𝜑 → ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (𝐺‘𝑥)) ∈ MblFn ↔ ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐺‘𝑥))) ∈ MblFn ∧ (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐺‘𝑥))) ∈ MblFn)))
61	59, 60	mpbid 231	. . . . . . 7 ⊢ (𝜑 → ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐺‘𝑥))) ∈ MblFn ∧ (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐺‘𝑥))) ∈ MblFn))
62	61	simpld 494	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐺‘𝑥))) ∈ MblFn)
63	29	fmpttd 7109	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐹‘𝑥))):(dom 𝐹 ∩ dom 𝐺)⟶ℝ)
64	30	fmpttd 7109	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐺‘𝑥))):(dom 𝐹 ∩ dom 𝐺)⟶ℝ)
65	51, 62, 63, 64	mbfmullem 25606	. . . . 5 ⊢ (𝜑 → ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐺‘𝑥)))) ∈ MblFn)
66	50	simprd 495	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐹‘𝑥))) ∈ MblFn)
67	61	simprd 495	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐺‘𝑥))) ∈ MblFn)
68	34	fmpttd 7109	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐹‘𝑥))):(dom 𝐹 ∩ dom 𝐺)⟶ℝ)
69	35	fmpttd 7109	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐺‘𝑥))):(dom 𝐹 ∩ dom 𝐺)⟶ℝ)
70	66, 67, 68, 69	mbfmullem 25606	. . . . 5 ⊢ (𝜑 → ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐺‘𝑥)))) ∈ MblFn)
71	65, 70	mbfsub 25542	. . . 4 ⊢ (𝜑 → (((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐺‘𝑥)))) ∘_f − ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐺‘𝑥))))) ∈ MblFn)
72	40, 71	eqeltrd 2827	. . 3 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘((𝐹‘𝑥) · (𝐺‘𝑥)))) ∈ MblFn)
73	19, 22	immuld 15170	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (dom 𝐹 ∩ dom 𝐺)) → (ℑ‘((𝐹‘𝑥) · (𝐺‘𝑥))) = (((ℜ‘(𝐹‘𝑥)) · (ℑ‘(𝐺‘𝑥))) + ((ℑ‘(𝐹‘𝑥)) · (ℜ‘(𝐺‘𝑥)))))
74	73	mpteq2dva 5241	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘((𝐹‘𝑥) · (𝐺‘𝑥)))) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (((ℜ‘(𝐹‘𝑥)) · (ℑ‘(𝐺‘𝑥))) + ((ℑ‘(𝐹‘𝑥)) · (ℜ‘(𝐺‘𝑥))))))
75		ovexd 7439	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (dom 𝐹 ∩ dom 𝐺)) → ((ℜ‘(𝐹‘𝑥)) · (ℑ‘(𝐺‘𝑥))) ∈ V)
76		ovexd 7439	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (dom 𝐹 ∩ dom 𝐺)) → ((ℑ‘(𝐹‘𝑥)) · (ℜ‘(𝐺‘𝑥))) ∈ V)
77	26, 29, 35, 31, 37	offval2 7686	. . . . . 6 ⊢ (𝜑 → ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐺‘𝑥)))) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ ((ℜ‘(𝐹‘𝑥)) · (ℑ‘(𝐺‘𝑥)))))
78	26, 34, 30, 36, 32	offval2 7686	. . . . . 6 ⊢ (𝜑 → ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐺‘𝑥)))) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ ((ℑ‘(𝐹‘𝑥)) · (ℜ‘(𝐺‘𝑥)))))
79	26, 75, 76, 77, 78	offval2 7686	. . . . 5 ⊢ (𝜑 → (((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐺‘𝑥)))) ∘_f + ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐺‘𝑥))))) = (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (((ℜ‘(𝐹‘𝑥)) · (ℑ‘(𝐺‘𝑥))) + ((ℑ‘(𝐹‘𝑥)) · (ℜ‘(𝐺‘𝑥))))))
80	74, 79	eqtr4d 2769	. . . 4 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘((𝐹‘𝑥) · (𝐺‘𝑥)))) = (((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐺‘𝑥)))) ∘_f + ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐺‘𝑥))))))
81	51, 67, 63, 69	mbfmullem 25606	. . . . 5 ⊢ (𝜑 → ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐺‘𝑥)))) ∈ MblFn)
82	66, 62, 68, 64	mbfmullem 25606	. . . . 5 ⊢ (𝜑 → ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐺‘𝑥)))) ∈ MblFn)
83	81, 82	mbfadd 25541	. . . 4 ⊢ (𝜑 → (((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐺‘𝑥)))) ∘_f + ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘(𝐹‘𝑥))) ∘_f · (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘(𝐺‘𝑥))))) ∈ MblFn)
84	80, 83	eqeltrd 2827	. . 3 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘((𝐹‘𝑥) · (𝐺‘𝑥)))) ∈ MblFn)
85	19, 22	mulcld 11235	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ (dom 𝐹 ∩ dom 𝐺)) → ((𝐹‘𝑥) · (𝐺‘𝑥)) ∈ ℂ)
86	85	ismbfcn2 25518	. . 3 ⊢ (𝜑 → ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ ((𝐹‘𝑥) · (𝐺‘𝑥))) ∈ MblFn ↔ ((𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℜ‘((𝐹‘𝑥) · (𝐺‘𝑥)))) ∈ MblFn ∧ (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ (ℑ‘((𝐹‘𝑥) · (𝐺‘𝑥)))) ∈ MblFn)))
87	72, 84, 86	mpbir2and 710	. 2 ⊢ (𝜑 → (𝑥 ∈ (dom 𝐹 ∩ dom 𝐺) ↦ ((𝐹‘𝑥) · (𝐺‘𝑥))) ∈ MblFn)
88	16, 87	eqeltrd 2827	1 ⊢ (𝜑 → (𝐹 ∘_f · 𝐺) ∈ MblFn)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1533 ∈ wcel 2098 Vcvv 3468 ∩ cin 3942 ⊆ wss 3943 ↦ cmpt 5224 dom cdm 5669 ↾ cres 5671 ⟶wf 6532 ‘cfv 6536 (class class class)co 7404 ∘_f cof 7664 ℂcc 11107 ℝcr 11108 + caddc 11112 · cmul 11114 − cmin 11445 ℜcre 15048 ℑcim 15049 volcvol 25343 MblFncmbf 25494

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2697 ax-rep 5278 ax-sep 5292 ax-nul 5299 ax-pow 5356 ax-pr 5420 ax-un 7721 ax-inf2 9635 ax-cc 10429 ax-cnex 11165 ax-resscn 11166 ax-1cn 11167 ax-icn 11168 ax-addcl 11169 ax-addrcl 11170 ax-mulcl 11171 ax-mulrcl 11172 ax-mulcom 11173 ax-addass 11174 ax-mulass 11175 ax-distr 11176 ax-i2m1 11177 ax-1ne0 11178 ax-1rid 11179 ax-rnegex 11180 ax-rrecex 11181 ax-cnre 11182 ax-pre-lttri 11183 ax-pre-lttrn 11184 ax-pre-ltadd 11185 ax-pre-mulgt0 11186 ax-pre-sup 11187

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2704 df-cleq 2718 df-clel 2804 df-nfc 2879 df-ne 2935 df-nel 3041 df-ral 3056 df-rex 3065 df-rmo 3370 df-reu 3371 df-rab 3427 df-v 3470 df-sbc 3773 df-csb 3889 df-dif 3946 df-un 3948 df-in 3950 df-ss 3960 df-pss 3962 df-nul 4318 df-if 4524 df-pw 4599 df-sn 4624 df-pr 4626 df-op 4630 df-uni 4903 df-int 4944 df-iun 4992 df-disj 5107 df-br 5142 df-opab 5204 df-mpt 5225 df-tr 5259 df-id 5567 df-eprel 5573 df-po 5581 df-so 5582 df-fr 5624 df-se 5625 df-we 5626 df-xp 5675 df-rel 5676 df-cnv 5677 df-co 5678 df-dm 5679 df-rn 5680 df-res 5681 df-ima 5682 df-pred 6293 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6488 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-isom 6545 df-riota 7360 df-ov 7407 df-oprab 7408 df-mpo 7409 df-of 7666 df-ofr 7667 df-om 7852 df-1st 7971 df-2nd 7972 df-frecs 8264 df-wrecs 8295 df-recs 8369 df-rdg 8408 df-1o 8464 df-2o 8465 df-oadd 8468 df-omul 8469 df-er 8702 df-map 8821 df-pm 8822 df-en 8939 df-dom 8940 df-sdom 8941 df-fin 8942 df-fi 9405 df-sup 9436 df-inf 9437 df-oi 9504 df-dju 9895 df-card 9933 df-acn 9936 df-pnf 11251 df-mnf 11252 df-xr 11253 df-ltxr 11254 df-le 11255 df-sub 11447 df-neg 11448 df-div 11873 df-nn 12214 df-2 12276 df-3 12277 df-n0 12474 df-z 12560 df-uz 12824 df-q 12934 df-rp 12978 df-xneg 13095 df-xadd 13096 df-xmul 13097 df-ioo 13331 df-ioc 13332 df-ico 13333 df-icc 13334 df-fz 13488 df-fzo 13631 df-fl 13760 df-seq 13970 df-exp 14031 df-hash 14294 df-cj 15050 df-re 15051 df-im 15052 df-sqrt 15186 df-abs 15187 df-limsup 15419 df-clim 15436 df-rlim 15437 df-sum 15637 df-rest 17375 df-topgen 17396 df-psmet 21228 df-xmet 21229 df-met 21230 df-bl 21231 df-mopn 21232 df-top 22747 df-topon 22764 df-bases 22800 df-cmp 23242 df-ovol 25344 df-vol 25345 df-mbf 25499 df-itg1 25500 df-0p 25550

This theorem is referenced by: bddmulibl 25719

W3C validator