mbfmulc2 - Metamath Proof Explorer

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Theorem mbfmulc2 23236

Description: A complex constant times a measurable function is measurable. (Contributed by Mario Carneiro, 17-Aug-2014.)

**Hypotheses**
Ref	Expression
mbfmulc2.1	⊢ (𝜑 → 𝐶 ∈ ℂ)
mbfmulc2.2	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ 𝑉)
mbfmulc2.3	⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵) ∈ MblFn)

**Assertion**
Ref	Expression
mbfmulc2	⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (𝐶 · 𝐵)) ∈ MblFn)

Distinct variable groups: 𝑥,𝐴 𝑥,𝐶 𝜑,𝑥 Allowed substitution hints: 𝐵(𝑥) 𝑉(𝑥)

**Proof of Theorem mbfmulc2**
Step	Hyp	Ref	Expression
1		mbfmulc2.3	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵) ∈ MblFn)
2		mbfmulc2.2	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ 𝑉)
3	1, 2	mbfdm2 23211	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ dom vol)
4		mbfmulc2.1	. . . . . . . . 9 ⊢ (𝜑 → 𝐶 ∈ ℂ)
5	4	recld 13782	. . . . . . . 8 ⊢ (𝜑 → (ℜ‘𝐶) ∈ ℝ)
6	5	adantr 480	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (ℜ‘𝐶) ∈ ℝ)
7	6	recnd 9947	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (ℜ‘𝐶) ∈ ℂ)
8	1, 2	mbfmptcl 23210	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℂ)
9	8	recld 13782	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (ℜ‘𝐵) ∈ ℝ)
10	9	recnd 9947	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (ℜ‘𝐵) ∈ ℂ)
11	7, 10	mulcld 9939	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ((ℜ‘𝐶) · (ℜ‘𝐵)) ∈ ℂ)
12		ovex 6577	. . . . . 6 ⊢ (-(ℑ‘𝐶) · (ℑ‘𝐵)) ∈ V
13	12	a1i 11	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (-(ℑ‘𝐶) · (ℑ‘𝐵)) ∈ V)
14		fconstmpt 5085	. . . . . . 7 ⊢ (𝐴 × {(ℜ‘𝐶)}) = (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐶))
15	14	a1i 11	. . . . . 6 ⊢ (𝜑 → (𝐴 × {(ℜ‘𝐶)}) = (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐶)))
16		eqidd 2611	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵)) = (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵)))
17	3, 6, 9, 15, 16	offval2 6812	. . . . 5 ⊢ (𝜑 → ((𝐴 × {(ℜ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵))) = (𝑥 ∈ 𝐴 ↦ ((ℜ‘𝐶) · (ℜ‘𝐵))))
18	4	imcld 13783	. . . . . . . 8 ⊢ (𝜑 → (ℑ‘𝐶) ∈ ℝ)
19	18	renegcld 10336	. . . . . . 7 ⊢ (𝜑 → -(ℑ‘𝐶) ∈ ℝ)
20	19	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → -(ℑ‘𝐶) ∈ ℝ)
21	8	imcld 13783	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (ℑ‘𝐵) ∈ ℝ)
22		fconstmpt 5085	. . . . . . 7 ⊢ (𝐴 × {-(ℑ‘𝐶)}) = (𝑥 ∈ 𝐴 ↦ -(ℑ‘𝐶))
23	22	a1i 11	. . . . . 6 ⊢ (𝜑 → (𝐴 × {-(ℑ‘𝐶)}) = (𝑥 ∈ 𝐴 ↦ -(ℑ‘𝐶)))
24		eqidd 2611	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵)) = (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵)))
25	3, 20, 21, 23, 24	offval2 6812	. . . . 5 ⊢ (𝜑 → ((𝐴 × {-(ℑ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵))) = (𝑥 ∈ 𝐴 ↦ (-(ℑ‘𝐶) · (ℑ‘𝐵))))
26	3, 11, 13, 17, 25	offval2 6812	. . . 4 ⊢ (𝜑 → (((𝐴 × {(ℜ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵))) ∘_𝑓 + ((𝐴 × {-(ℑ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵)))) = (𝑥 ∈ 𝐴 ↦ (((ℜ‘𝐶) · (ℜ‘𝐵)) + (-(ℑ‘𝐶) · (ℑ‘𝐵)))))
27	18	adantr 480	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (ℑ‘𝐶) ∈ ℝ)
28	27	recnd 9947	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (ℑ‘𝐶) ∈ ℂ)
29	21	recnd 9947	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (ℑ‘𝐵) ∈ ℂ)
30	28, 29	mulcld 9939	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ((ℑ‘𝐶) · (ℑ‘𝐵)) ∈ ℂ)
31	11, 30	negsubd 10277	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (((ℜ‘𝐶) · (ℜ‘𝐵)) + -((ℑ‘𝐶) · (ℑ‘𝐵))) = (((ℜ‘𝐶) · (ℜ‘𝐵)) − ((ℑ‘𝐶) · (ℑ‘𝐵))))
32	28, 29	mulneg1d 10362	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (-(ℑ‘𝐶) · (ℑ‘𝐵)) = -((ℑ‘𝐶) · (ℑ‘𝐵)))
33	32	oveq2d 6565	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (((ℜ‘𝐶) · (ℜ‘𝐵)) + (-(ℑ‘𝐶) · (ℑ‘𝐵))) = (((ℜ‘𝐶) · (ℜ‘𝐵)) + -((ℑ‘𝐶) · (ℑ‘𝐵))))
34	4	adantr 480	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐶 ∈ ℂ)
35	34, 8	remuld 13806	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (ℜ‘(𝐶 · 𝐵)) = (((ℜ‘𝐶) · (ℜ‘𝐵)) − ((ℑ‘𝐶) · (ℑ‘𝐵))))
36	31, 33, 35	3eqtr4d 2654	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (((ℜ‘𝐶) · (ℜ‘𝐵)) + (-(ℑ‘𝐶) · (ℑ‘𝐵))) = (ℜ‘(𝐶 · 𝐵)))
37	36	mpteq2dva 4672	. . . 4 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (((ℜ‘𝐶) · (ℜ‘𝐵)) + (-(ℑ‘𝐶) · (ℑ‘𝐵)))) = (𝑥 ∈ 𝐴 ↦ (ℜ‘(𝐶 · 𝐵))))
38	26, 37	eqtrd 2644	. . 3 ⊢ (𝜑 → (((𝐴 × {(ℜ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵))) ∘_𝑓 + ((𝐴 × {-(ℑ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵)))) = (𝑥 ∈ 𝐴 ↦ (ℜ‘(𝐶 · 𝐵))))
39	8	ismbfcn2 23212	. . . . . . 7 ⊢ (𝜑 → ((𝑥 ∈ 𝐴 ↦ 𝐵) ∈ MblFn ↔ ((𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵)) ∈ MblFn ∧ (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵)) ∈ MblFn)))
40	1, 39	mpbid 221	. . . . . 6 ⊢ (𝜑 → ((𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵)) ∈ MblFn ∧ (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵)) ∈ MblFn))
41	40	simpld 474	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵)) ∈ MblFn)
42		eqid 2610	. . . . . 6 ⊢ (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵)) = (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵))
43	10, 42	fmptd 6292	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵)):𝐴⟶ℂ)
44	41, 5, 43	mbfmulc2re 23221	. . . 4 ⊢ (𝜑 → ((𝐴 × {(ℜ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵))) ∈ MblFn)
45	40	simprd 478	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵)) ∈ MblFn)
46		eqid 2610	. . . . . 6 ⊢ (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵)) = (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵))
47	29, 46	fmptd 6292	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵)):𝐴⟶ℂ)
48	45, 19, 47	mbfmulc2re 23221	. . . 4 ⊢ (𝜑 → ((𝐴 × {-(ℑ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵))) ∈ MblFn)
49	44, 48	mbfadd 23234	. . 3 ⊢ (𝜑 → (((𝐴 × {(ℜ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵))) ∘_𝑓 + ((𝐴 × {-(ℑ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵)))) ∈ MblFn)
50	38, 49	eqeltrrd 2689	. 2 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (ℜ‘(𝐶 · 𝐵))) ∈ MblFn)
51		ovex 6577	. . . . . 6 ⊢ ((ℜ‘𝐶) · (ℑ‘𝐵)) ∈ V
52	51	a1i 11	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ((ℜ‘𝐶) · (ℑ‘𝐵)) ∈ V)
53		ovex 6577	. . . . . 6 ⊢ ((ℑ‘𝐶) · (ℜ‘𝐵)) ∈ V
54	53	a1i 11	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ((ℑ‘𝐶) · (ℜ‘𝐵)) ∈ V)
55	3, 6, 21, 15, 24	offval2 6812	. . . . 5 ⊢ (𝜑 → ((𝐴 × {(ℜ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵))) = (𝑥 ∈ 𝐴 ↦ ((ℜ‘𝐶) · (ℑ‘𝐵))))
56		fconstmpt 5085	. . . . . . 7 ⊢ (𝐴 × {(ℑ‘𝐶)}) = (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐶))
57	56	a1i 11	. . . . . 6 ⊢ (𝜑 → (𝐴 × {(ℑ‘𝐶)}) = (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐶)))
58	3, 27, 9, 57, 16	offval2 6812	. . . . 5 ⊢ (𝜑 → ((𝐴 × {(ℑ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵))) = (𝑥 ∈ 𝐴 ↦ ((ℑ‘𝐶) · (ℜ‘𝐵))))
59	3, 52, 54, 55, 58	offval2 6812	. . . 4 ⊢ (𝜑 → (((𝐴 × {(ℜ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵))) ∘_𝑓 + ((𝐴 × {(ℑ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵)))) = (𝑥 ∈ 𝐴 ↦ (((ℜ‘𝐶) · (ℑ‘𝐵)) + ((ℑ‘𝐶) · (ℜ‘𝐵)))))
60	34, 8	immuld 13807	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (ℑ‘(𝐶 · 𝐵)) = (((ℜ‘𝐶) · (ℑ‘𝐵)) + ((ℑ‘𝐶) · (ℜ‘𝐵))))
61	60	mpteq2dva 4672	. . . 4 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (ℑ‘(𝐶 · 𝐵))) = (𝑥 ∈ 𝐴 ↦ (((ℜ‘𝐶) · (ℑ‘𝐵)) + ((ℑ‘𝐶) · (ℜ‘𝐵)))))
62	59, 61	eqtr4d 2647	. . 3 ⊢ (𝜑 → (((𝐴 × {(ℜ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵))) ∘_𝑓 + ((𝐴 × {(ℑ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵)))) = (𝑥 ∈ 𝐴 ↦ (ℑ‘(𝐶 · 𝐵))))
63	45, 5, 47	mbfmulc2re 23221	. . . 4 ⊢ (𝜑 → ((𝐴 × {(ℜ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵))) ∈ MblFn)
64	41, 18, 43	mbfmulc2re 23221	. . . 4 ⊢ (𝜑 → ((𝐴 × {(ℑ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵))) ∈ MblFn)
65	63, 64	mbfadd 23234	. . 3 ⊢ (𝜑 → (((𝐴 × {(ℜ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵))) ∘_𝑓 + ((𝐴 × {(ℑ‘𝐶)}) ∘_𝑓 · (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵)))) ∈ MblFn)
66	62, 65	eqeltrrd 2689	. 2 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (ℑ‘(𝐶 · 𝐵))) ∈ MblFn)
67	34, 8	mulcld 9939	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐶 · 𝐵) ∈ ℂ)
68	67	ismbfcn2 23212	. 2 ⊢ (𝜑 → ((𝑥 ∈ 𝐴 ↦ (𝐶 · 𝐵)) ∈ MblFn ↔ ((𝑥 ∈ 𝐴 ↦ (ℜ‘(𝐶 · 𝐵))) ∈ MblFn ∧ (𝑥 ∈ 𝐴 ↦ (ℑ‘(𝐶 · 𝐵))) ∈ MblFn)))
69	50, 66, 68	mpbir2and 959	1 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (𝐶 · 𝐵)) ∈ MblFn)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 383 = wceq 1475 ∈ wcel 1977 Vcvv 3173 {csn 4125 ↦ cmpt 4643 × cxp 5036 dom cdm 5038 ‘cfv 5804 (class class class)co 6549 ∘_𝑓 cof 6793 ℂcc 9813 ℝcr 9814 + caddc 9818 · cmul 9820 − cmin 10145 -cneg 10146 ℜcre 13685 ℑcim 13686 volcvol 23039 MblFncmbf 23189

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-inf2 8421 ax-cc 9140 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 ax-pre-sup 9893

This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 df-3an 1033 df-tru 1478 df-fal 1481 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-rmo 2904 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-disj 4554 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-se 4998 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-isom 5813 df-riota 6511 df-ov 6552 df-oprab 6553 df-mpt2 6554 df-of 6795 df-om 6958 df-1st 7059 df-2nd 7060 df-wrecs 7294 df-recs 7355 df-rdg 7393 df-1o 7447 df-2o 7448 df-oadd 7451 df-omul 7452 df-er 7629 df-map 7746 df-pm 7747 df-en 7842 df-dom 7843 df-sdom 7844 df-fin 7845 df-sup 8231 df-inf 8232 df-oi 8298 df-card 8648 df-acn 8651 df-cda 8873 df-pnf 9955 df-mnf 9956 df-xr 9957 df-ltxr 9958 df-le 9959 df-sub 10147 df-neg 10148 df-div 10564 df-nn 10898 df-2 10956 df-3 10957 df-n0 11170 df-z 11255 df-uz 11564 df-q 11665 df-rp 11709 df-xadd 11823 df-ioo 12050 df-ioc 12051 df-ico 12052 df-icc 12053 df-fz 12198 df-fzo 12335 df-fl 12455 df-seq 12664 df-exp 12723 df-hash 12980 df-cj 13687 df-re 13688 df-im 13689 df-sqrt 13823 df-abs 13824 df-clim 14067 df-rlim 14068 df-sum 14265 df-xmet 19560 df-met 19561 df-ovol 23040 df-vol 23041 df-mbf 23194

This theorem is referenced by: iblmulc2 23403

W3C validator