itgabsnc - Mathbox for Brendan Leahy

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Theorem itgabsnc 36545

Description: Choice-free analogue of itgabs 25343. (Contributed by Brendan Leahy, 19-Nov-2017.) (Revised by Brendan Leahy, 19-Jun-2018.)

**Hypotheses**
Ref	Expression
itgabsnc.1	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ 𝑉)
itgabsnc.2	⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵) ∈ 𝐿¹)
itgabsnc.m1	⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (abs‘𝐵)) ∈ MblFn)
itgabsnc.m2	⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ ((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) ∈ MblFn)

**Assertion**
Ref	Expression
itgabsnc	⊢ (𝜑 → (abs‘∫𝐴𝐵 d𝑥) ≤ ∫𝐴(abs‘𝐵) d𝑥)

Distinct variable groups: 𝑥,𝑦,𝐴 𝑦,𝐵 𝜑,𝑥,𝑦 𝑥,𝑉,𝑦 Allowed substitution hint: 𝐵(𝑥)

**Proof of Theorem itgabsnc**
Step	Hyp	Ref	Expression
1		itgabsnc.1	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ 𝑉)
2		itgabsnc.2	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵) ∈ 𝐿¹)
3	1, 2	itgcl 25292	. . . . . . . . . . 11 ⊢ (𝜑 → ∫𝐴𝐵 d𝑥 ∈ ℂ)
4	3	cjcld 15139	. . . . . . . . . 10 ⊢ (𝜑 → (∗‘∫𝐴𝐵 d𝑥) ∈ ℂ)
5		iblmbf 25276	. . . . . . . . . . . . . . 15 ⊢ ((𝑥 ∈ 𝐴 ↦ 𝐵) ∈ 𝐿¹ → (𝑥 ∈ 𝐴 ↦ 𝐵) ∈ MblFn)
6	2, 5	syl 17	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵) ∈ MblFn)
7	6, 1	mbfmptcl 25144	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℂ)
8	7	ralrimiva 3146	. . . . . . . . . . . 12 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 𝐵 ∈ ℂ)
9		nfv 1917	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑦 𝐵 ∈ ℂ
10		nfcsb1v 3917	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑥⦋𝑦 / 𝑥⦌𝐵
11	10	nfel1 2919	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑥⦋𝑦 / 𝑥⦌𝐵 ∈ ℂ
12		csbeq1a 3906	. . . . . . . . . . . . . 14 ⊢ (𝑥 = 𝑦 → 𝐵 = ⦋𝑦 / 𝑥⦌𝐵)
13	12	eleq1d 2818	. . . . . . . . . . . . 13 ⊢ (𝑥 = 𝑦 → (𝐵 ∈ ℂ ↔ ⦋𝑦 / 𝑥⦌𝐵 ∈ ℂ))
14	9, 11, 13	cbvralw 3303	. . . . . . . . . . . 12 ⊢ (∀𝑥 ∈ 𝐴 𝐵 ∈ ℂ ↔ ∀𝑦 ∈ 𝐴 ⦋𝑦 / 𝑥⦌𝐵 ∈ ℂ)
15	8, 14	sylib 217	. . . . . . . . . . 11 ⊢ (𝜑 → ∀𝑦 ∈ 𝐴 ⦋𝑦 / 𝑥⦌𝐵 ∈ ℂ)
16	15	r19.21bi 3248	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → ⦋𝑦 / 𝑥⦌𝐵 ∈ ℂ)
17		nfcv 2903	. . . . . . . . . . . 12 ⊢ Ⅎ𝑦𝐵
18	17, 10, 12	cbvmpt 5258	. . . . . . . . . . 11 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑦 ∈ 𝐴 ↦ ⦋𝑦 / 𝑥⦌𝐵)
19	18, 2	eqeltrrid 2838	. . . . . . . . . 10 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ ⦋𝑦 / 𝑥⦌𝐵) ∈ 𝐿¹)
20		itgabsnc.m2	. . . . . . . . . 10 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ ((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) ∈ MblFn)
21	4, 16, 19, 20	iblmulc2nc 36541	. . . . . . . . 9 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ ((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) ∈ 𝐿¹)
22	4	adantr 481	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (∗‘∫𝐴𝐵 d𝑥) ∈ ℂ)
23	22, 16	mulcld 11230	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → ((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) ∈ ℂ)
24	23	iblcn 25307	. . . . . . . . 9 ⊢ (𝜑 → ((𝑦 ∈ 𝐴 ↦ ((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) ∈ 𝐿¹ ↔ ((𝑦 ∈ 𝐴 ↦ (ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵))) ∈ 𝐿¹ ∧ (𝑦 ∈ 𝐴 ↦ (ℑ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵))) ∈ 𝐿¹)))
25	21, 24	mpbid 231	. . . . . . . 8 ⊢ (𝜑 → ((𝑦 ∈ 𝐴 ↦ (ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵))) ∈ 𝐿¹ ∧ (𝑦 ∈ 𝐴 ↦ (ℑ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵))) ∈ 𝐿¹))
26	25	simpld 495	. . . . . . 7 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ (ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵))) ∈ 𝐿¹)
27	22, 16	absmuld 15397	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) = ((abs‘(∗‘∫𝐴𝐵 d𝑥)) · (abs‘⦋𝑦 / 𝑥⦌𝐵)))
28	27	mpteq2dva 5247	. . . . . . . . . 10 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵))) = (𝑦 ∈ 𝐴 ↦ ((abs‘(∗‘∫𝐴𝐵 d𝑥)) · (abs‘⦋𝑦 / 𝑥⦌𝐵))))
29	6, 1	mbfdm2 25145	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐴 ∈ dom vol)
30	22	abscld 15379	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘(∗‘∫𝐴𝐵 d𝑥)) ∈ ℝ)
31	16	abscld 15379	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘⦋𝑦 / 𝑥⦌𝐵) ∈ ℝ)
32		fconstmpt 5736	. . . . . . . . . . . 12 ⊢ (𝐴 × {(abs‘(∗‘∫𝐴𝐵 d𝑥))}) = (𝑦 ∈ 𝐴 ↦ (abs‘(∗‘∫𝐴𝐵 d𝑥)))
33	32	a1i 11	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐴 × {(abs‘(∗‘∫𝐴𝐵 d𝑥))}) = (𝑦 ∈ 𝐴 ↦ (abs‘(∗‘∫𝐴𝐵 d𝑥))))
34		nfcv 2903	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑦(abs‘𝐵)
35		nfcv 2903	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑥abs
36	35, 10	nffv 6898	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑥(abs‘⦋𝑦 / 𝑥⦌𝐵)
37	12	fveq2d 6892	. . . . . . . . . . . . 13 ⊢ (𝑥 = 𝑦 → (abs‘𝐵) = (abs‘⦋𝑦 / 𝑥⦌𝐵))
38	34, 36, 37	cbvmpt 5258	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ 𝐴 ↦ (abs‘𝐵)) = (𝑦 ∈ 𝐴 ↦ (abs‘⦋𝑦 / 𝑥⦌𝐵))
39	38	a1i 11	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (abs‘𝐵)) = (𝑦 ∈ 𝐴 ↦ (abs‘⦋𝑦 / 𝑥⦌𝐵)))
40	29, 30, 31, 33, 39	offval2 7686	. . . . . . . . . 10 ⊢ (𝜑 → ((𝐴 × {(abs‘(∗‘∫𝐴𝐵 d𝑥))}) ∘_f · (𝑥 ∈ 𝐴 ↦ (abs‘𝐵))) = (𝑦 ∈ 𝐴 ↦ ((abs‘(∗‘∫𝐴𝐵 d𝑥)) · (abs‘⦋𝑦 / 𝑥⦌𝐵))))
41	28, 40	eqtr4d 2775	. . . . . . . . 9 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵))) = ((𝐴 × {(abs‘(∗‘∫𝐴𝐵 d𝑥))}) ∘_f · (𝑥 ∈ 𝐴 ↦ (abs‘𝐵))))
42		itgabsnc.m1	. . . . . . . . . 10 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (abs‘𝐵)) ∈ MblFn)
43	4	abscld 15379	. . . . . . . . . 10 ⊢ (𝜑 → (abs‘(∗‘∫𝐴𝐵 d𝑥)) ∈ ℝ)
44	7	abscld 15379	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (abs‘𝐵) ∈ ℝ)
45	44	recnd 11238	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (abs‘𝐵) ∈ ℂ)
46	45	fmpttd 7111	. . . . . . . . . 10 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (abs‘𝐵)):𝐴⟶ℂ)
47	42, 43, 46	mbfmulc2re 25156	. . . . . . . . 9 ⊢ (𝜑 → ((𝐴 × {(abs‘(∗‘∫𝐴𝐵 d𝑥))}) ∘_f · (𝑥 ∈ 𝐴 ↦ (abs‘𝐵))) ∈ MblFn)
48	41, 47	eqeltrd 2833	. . . . . . . 8 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵))) ∈ MblFn)
49	23, 21, 48	iblabsnc 36540	. . . . . . 7 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵))) ∈ 𝐿¹)
50	23	recld 15137	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) ∈ ℝ)
51	23	abscld 15379	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) ∈ ℝ)
52	23	releabsd 15394	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) ≤ (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)))
53	26, 49, 50, 51, 52	itgle 25318	. . . . . 6 ⊢ (𝜑 → ∫𝐴(ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦 ≤ ∫𝐴(abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
54	3	abscld 15379	. . . . . . . . 9 ⊢ (𝜑 → (abs‘∫𝐴𝐵 d𝑥) ∈ ℝ)
55	54	recnd 11238	. . . . . . . 8 ⊢ (𝜑 → (abs‘∫𝐴𝐵 d𝑥) ∈ ℂ)
56	55	sqvald 14104	. . . . . . 7 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥)↑2) = ((abs‘∫𝐴𝐵 d𝑥) · (abs‘∫𝐴𝐵 d𝑥)))
57	3	absvalsqd 15385	. . . . . . . . . 10 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥)↑2) = (∫𝐴𝐵 d𝑥 · (∗‘∫𝐴𝐵 d𝑥)))
58	3, 4	mulcomd 11231	. . . . . . . . . 10 ⊢ (𝜑 → (∫𝐴𝐵 d𝑥 · (∗‘∫𝐴𝐵 d𝑥)) = ((∗‘∫𝐴𝐵 d𝑥) · ∫𝐴𝐵 d𝑥))
59	12, 17, 10	cbvitg 25284	. . . . . . . . . . . 12 ⊢ ∫𝐴𝐵 d𝑥 = ∫𝐴⦋𝑦 / 𝑥⦌𝐵 d𝑦
60	59	oveq2i 7416	. . . . . . . . . . 11 ⊢ ((∗‘∫𝐴𝐵 d𝑥) · ∫𝐴𝐵 d𝑥) = ((∗‘∫𝐴𝐵 d𝑥) · ∫𝐴⦋𝑦 / 𝑥⦌𝐵 d𝑦)
61	4, 16, 19, 20	itgmulc2nc 36544	. . . . . . . . . . 11 ⊢ (𝜑 → ((∗‘∫𝐴𝐵 d𝑥) · ∫𝐴⦋𝑦 / 𝑥⦌𝐵 d𝑦) = ∫𝐴((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) d𝑦)
62	60, 61	eqtrid 2784	. . . . . . . . . 10 ⊢ (𝜑 → ((∗‘∫𝐴𝐵 d𝑥) · ∫𝐴𝐵 d𝑥) = ∫𝐴((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) d𝑦)
63	57, 58, 62	3eqtrd 2776	. . . . . . . . 9 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥)↑2) = ∫𝐴((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) d𝑦)
64	63	fveq2d 6892	. . . . . . . 8 ⊢ (𝜑 → (ℜ‘((abs‘∫𝐴𝐵 d𝑥)↑2)) = (ℜ‘∫𝐴((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) d𝑦))
65	54	resqcld 14086	. . . . . . . . 9 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥)↑2) ∈ ℝ)
66	65	rered 15167	. . . . . . . 8 ⊢ (𝜑 → (ℜ‘((abs‘∫𝐴𝐵 d𝑥)↑2)) = ((abs‘∫𝐴𝐵 d𝑥)↑2))
67		ovexd 7440	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → ((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) ∈ V)
68	67, 21	itgre 25309	. . . . . . . 8 ⊢ (𝜑 → (ℜ‘∫𝐴((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) d𝑦) = ∫𝐴(ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
69	64, 66, 68	3eqtr3d 2780	. . . . . . 7 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥)↑2) = ∫𝐴(ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
70	56, 69	eqtr3d 2774	. . . . . 6 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥) · (abs‘∫𝐴𝐵 d𝑥)) = ∫𝐴(ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
71	37, 34, 36	cbvitg 25284	. . . . . . . 8 ⊢ ∫𝐴(abs‘𝐵) d𝑥 = ∫𝐴(abs‘⦋𝑦 / 𝑥⦌𝐵) d𝑦
72	71	oveq2i 7416	. . . . . . 7 ⊢ ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘𝐵) d𝑥) = ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘⦋𝑦 / 𝑥⦌𝐵) d𝑦)
73	1, 2, 42	iblabsnc 36540	. . . . . . . . . 10 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (abs‘𝐵)) ∈ 𝐿¹)
74	38, 73	eqeltrrid 2838	. . . . . . . . 9 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ (abs‘⦋𝑦 / 𝑥⦌𝐵)) ∈ 𝐿¹)
75	54	adantr 481	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘∫𝐴𝐵 d𝑥) ∈ ℝ)
76		fconstmpt 5736	. . . . . . . . . . . 12 ⊢ (𝐴 × {(abs‘∫𝐴𝐵 d𝑥)}) = (𝑦 ∈ 𝐴 ↦ (abs‘∫𝐴𝐵 d𝑥))
77	76	a1i 11	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐴 × {(abs‘∫𝐴𝐵 d𝑥)}) = (𝑦 ∈ 𝐴 ↦ (abs‘∫𝐴𝐵 d𝑥)))
78	29, 75, 31, 77, 39	offval2 7686	. . . . . . . . . 10 ⊢ (𝜑 → ((𝐴 × {(abs‘∫𝐴𝐵 d𝑥)}) ∘_f · (𝑥 ∈ 𝐴 ↦ (abs‘𝐵))) = (𝑦 ∈ 𝐴 ↦ ((abs‘∫𝐴𝐵 d𝑥) · (abs‘⦋𝑦 / 𝑥⦌𝐵))))
79	42, 54, 46	mbfmulc2re 25156	. . . . . . . . . 10 ⊢ (𝜑 → ((𝐴 × {(abs‘∫𝐴𝐵 d𝑥)}) ∘_f · (𝑥 ∈ 𝐴 ↦ (abs‘𝐵))) ∈ MblFn)
80	78, 79	eqeltrrd 2834	. . . . . . . . 9 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ ((abs‘∫𝐴𝐵 d𝑥) · (abs‘⦋𝑦 / 𝑥⦌𝐵))) ∈ MblFn)
81	55, 31, 74, 80	itgmulc2nc 36544	. . . . . . . 8 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘⦋𝑦 / 𝑥⦌𝐵) d𝑦) = ∫𝐴((abs‘∫𝐴𝐵 d𝑥) · (abs‘⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
82	3	adantr 481	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → ∫𝐴𝐵 d𝑥 ∈ ℂ)
83	82	abscjd 15393	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘(∗‘∫𝐴𝐵 d𝑥)) = (abs‘∫𝐴𝐵 d𝑥))
84	83	oveq1d 7420	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → ((abs‘(∗‘∫𝐴𝐵 d𝑥)) · (abs‘⦋𝑦 / 𝑥⦌𝐵)) = ((abs‘∫𝐴𝐵 d𝑥) · (abs‘⦋𝑦 / 𝑥⦌𝐵)))
85	27, 84	eqtrd 2772	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) = ((abs‘∫𝐴𝐵 d𝑥) · (abs‘⦋𝑦 / 𝑥⦌𝐵)))
86	85	itgeq2dv 25290	. . . . . . . 8 ⊢ (𝜑 → ∫𝐴(abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦 = ∫𝐴((abs‘∫𝐴𝐵 d𝑥) · (abs‘⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
87	81, 86	eqtr4d 2775	. . . . . . 7 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘⦋𝑦 / 𝑥⦌𝐵) d𝑦) = ∫𝐴(abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
88	72, 87	eqtrid 2784	. . . . . 6 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘𝐵) d𝑥) = ∫𝐴(abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
89	53, 70, 88	3brtr4d 5179	. . . . 5 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥) · (abs‘∫𝐴𝐵 d𝑥)) ≤ ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘𝐵) d𝑥))
90	89	adantr 481	. . . 4 ⊢ ((𝜑 ∧ 0 < (abs‘∫𝐴𝐵 d𝑥)) → ((abs‘∫𝐴𝐵 d𝑥) · (abs‘∫𝐴𝐵 d𝑥)) ≤ ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘𝐵) d𝑥))
91	54	adantr 481	. . . . 5 ⊢ ((𝜑 ∧ 0 < (abs‘∫𝐴𝐵 d𝑥)) → (abs‘∫𝐴𝐵 d𝑥) ∈ ℝ)
92	44, 73	itgrecl 25306	. . . . . 6 ⊢ (𝜑 → ∫𝐴(abs‘𝐵) d𝑥 ∈ ℝ)
93	92	adantr 481	. . . . 5 ⊢ ((𝜑 ∧ 0 < (abs‘∫𝐴𝐵 d𝑥)) → ∫𝐴(abs‘𝐵) d𝑥 ∈ ℝ)
94		simpr 485	. . . . 5 ⊢ ((𝜑 ∧ 0 < (abs‘∫𝐴𝐵 d𝑥)) → 0 < (abs‘∫𝐴𝐵 d𝑥))
95		lemul2 12063	. . . . 5 ⊢ (((abs‘∫𝐴𝐵 d𝑥) ∈ ℝ ∧ ∫𝐴(abs‘𝐵) d𝑥 ∈ ℝ ∧ ((abs‘∫𝐴𝐵 d𝑥) ∈ ℝ ∧ 0 < (abs‘∫𝐴𝐵 d𝑥))) → ((abs‘∫𝐴𝐵 d𝑥) ≤ ∫𝐴(abs‘𝐵) d𝑥 ↔ ((abs‘∫𝐴𝐵 d𝑥) · (abs‘∫𝐴𝐵 d𝑥)) ≤ ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘𝐵) d𝑥)))
96	91, 93, 91, 94, 95	syl112anc 1374	. . . 4 ⊢ ((𝜑 ∧ 0 < (abs‘∫𝐴𝐵 d𝑥)) → ((abs‘∫𝐴𝐵 d𝑥) ≤ ∫𝐴(abs‘𝐵) d𝑥 ↔ ((abs‘∫𝐴𝐵 d𝑥) · (abs‘∫𝐴𝐵 d𝑥)) ≤ ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘𝐵) d𝑥)))
97	90, 96	mpbird 256	. . 3 ⊢ ((𝜑 ∧ 0 < (abs‘∫𝐴𝐵 d𝑥)) → (abs‘∫𝐴𝐵 d𝑥) ≤ ∫𝐴(abs‘𝐵) d𝑥)
98	97	ex 413	. 2 ⊢ (𝜑 → (0 < (abs‘∫𝐴𝐵 d𝑥) → (abs‘∫𝐴𝐵 d𝑥) ≤ ∫𝐴(abs‘𝐵) d𝑥))
99	7	absge0d 15387	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 0 ≤ (abs‘𝐵))
100	73, 44, 99	itgge0 25319	. . 3 ⊢ (𝜑 → 0 ≤ ∫𝐴(abs‘𝐵) d𝑥)
101		breq1 5150	. . 3 ⊢ (0 = (abs‘∫𝐴𝐵 d𝑥) → (0 ≤ ∫𝐴(abs‘𝐵) d𝑥 ↔ (abs‘∫𝐴𝐵 d𝑥) ≤ ∫𝐴(abs‘𝐵) d𝑥))
102	100, 101	syl5ibcom 244	. 2 ⊢ (𝜑 → (0 = (abs‘∫𝐴𝐵 d𝑥) → (abs‘∫𝐴𝐵 d𝑥) ≤ ∫𝐴(abs‘𝐵) d𝑥))
103	3	absge0d 15387	. . 3 ⊢ (𝜑 → 0 ≤ (abs‘∫𝐴𝐵 d𝑥))
104		0re 11212	. . . 4 ⊢ 0 ∈ ℝ
105		leloe 11296	. . . 4 ⊢ ((0 ∈ ℝ ∧ (abs‘∫𝐴𝐵 d𝑥) ∈ ℝ) → (0 ≤ (abs‘∫𝐴𝐵 d𝑥) ↔ (0 < (abs‘∫𝐴𝐵 d𝑥) ∨ 0 = (abs‘∫𝐴𝐵 d𝑥))))
106	104, 54, 105	sylancr 587	. . 3 ⊢ (𝜑 → (0 ≤ (abs‘∫𝐴𝐵 d𝑥) ↔ (0 < (abs‘∫𝐴𝐵 d𝑥) ∨ 0 = (abs‘∫𝐴𝐵 d𝑥))))
107	103, 106	mpbid 231	. 2 ⊢ (𝜑 → (0 < (abs‘∫𝐴𝐵 d𝑥) ∨ 0 = (abs‘∫𝐴𝐵 d𝑥)))
108	98, 102, 107	mpjaod 858	1 ⊢ (𝜑 → (abs‘∫𝐴𝐵 d𝑥) ≤ ∫𝐴(abs‘𝐵) d𝑥)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∨ wo 845 = wceq 1541 ∈ wcel 2106 ∀wral 3061 Vcvv 3474 ⦋csb 3892 {csn 4627 class class class wbr 5147 ↦ cmpt 5230 × cxp 5673 dom cdm 5675 ‘cfv 6540 (class class class)co 7405 ∘_f cof 7664 ℂcc 11104 ℝcr 11105 0cc0 11106 · cmul 11111 < clt 11244 ≤ cle 11245 2c2 12263 ↑cexp 14023 ∗ccj 15039 ℜcre 15040 ℑcim 15041 abscabs 15177 volcvol 24971 MblFncmbf 25122 𝐿¹cibl 25125 ∫citg 25126

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 ax-inf2 9632 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183 ax-pre-sup 11184 ax-addf 11185

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-op 4634 df-uni 4908 df-int 4950 df-iun 4998 df-disj 5113 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-se 5631 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-isom 6549 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-of 7666 df-ofr 7667 df-om 7852 df-1st 7971 df-2nd 7972 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-1o 8462 df-2o 8463 df-er 8699 df-map 8818 df-pm 8819 df-en 8936 df-dom 8937 df-sdom 8938 df-fin 8939 df-fi 9402 df-sup 9433 df-inf 9434 df-oi 9501 df-dju 9892 df-card 9930 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-div 11868 df-nn 12209 df-2 12271 df-3 12272 df-4 12273 df-n0 12469 df-z 12555 df-uz 12819 df-q 12929 df-rp 12971 df-xneg 13088 df-xadd 13089 df-xmul 13090 df-ioo 13324 df-ico 13326 df-icc 13327 df-fz 13481 df-fzo 13624 df-fl 13753 df-mod 13831 df-seq 13963 df-exp 14024 df-hash 14287 df-cj 15042 df-re 15043 df-im 15044 df-sqrt 15178 df-abs 15179 df-clim 15428 df-sum 15629 df-rest 17364 df-topgen 17385 df-psmet 20928 df-xmet 20929 df-met 20930 df-bl 20931 df-mopn 20932 df-top 22387 df-topon 22404 df-bases 22440 df-cmp 22882 df-ovol 24972 df-vol 24973 df-mbf 25127 df-itg1 25128 df-itg2 25129 df-ibl 25130 df-itg 25131 df-0p 25178

This theorem is referenced by: ftc1cnnclem 36547 ftc2nc 36558

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