itgabsnc - Mathbox for Brendan Leahy

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Theorem itgabsnc 37070

Description: Choice-free analogue of itgabs 25719. (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 25668	. . . . . . . . . . 11 ⊢ (𝜑 → ∫𝐴𝐵 d𝑥 ∈ ℂ)
4	3	cjcld 15149	. . . . . . . . . 10 ⊢ (𝜑 → (∗‘∫𝐴𝐵 d𝑥) ∈ ℂ)
5		iblmbf 25652	. . . . . . . . . . . . . . 15 ⊢ ((𝑥 ∈ 𝐴 ↦ 𝐵) ∈ 𝐿¹ → (𝑥 ∈ 𝐴 ↦ 𝐵) ∈ MblFn)
6	2, 5	syl 17	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵) ∈ MblFn)
7	6, 1	mbfmptcl 25520	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℂ)
8	7	ralrimiva 3140	. . . . . . . . . . . 12 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 𝐵 ∈ ℂ)
9		nfv 1909	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑦 𝐵 ∈ ℂ
10		nfcsb1v 3913	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑥⦋𝑦 / 𝑥⦌𝐵
11	10	nfel1 2913	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑥⦋𝑦 / 𝑥⦌𝐵 ∈ ℂ
12		csbeq1a 3902	. . . . . . . . . . . . . 14 ⊢ (𝑥 = 𝑦 → 𝐵 = ⦋𝑦 / 𝑥⦌𝐵)
13	12	eleq1d 2812	. . . . . . . . . . . . 13 ⊢ (𝑥 = 𝑦 → (𝐵 ∈ ℂ ↔ ⦋𝑦 / 𝑥⦌𝐵 ∈ ℂ))
14	9, 11, 13	cbvralw 3297	. . . . . . . . . . . 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 3242	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → ⦋𝑦 / 𝑥⦌𝐵 ∈ ℂ)
17		nfcv 2897	. . . . . . . . . . . 12 ⊢ Ⅎ𝑦𝐵
18	17, 10, 12	cbvmpt 5252	. . . . . . . . . . 11 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑦 ∈ 𝐴 ↦ ⦋𝑦 / 𝑥⦌𝐵)
19	18, 2	eqeltrrid 2832	. . . . . . . . . 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 37066	. . . . . . . . 9 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ ((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) ∈ 𝐿¹)
22	4	adantr 480	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (∗‘∫𝐴𝐵 d𝑥) ∈ ℂ)
23	22, 16	mulcld 11238	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → ((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) ∈ ℂ)
24	23	iblcn 25683	. . . . . . . . 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 494	. . . . . . 7 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ (ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵))) ∈ 𝐿¹)
27	22, 16	absmuld 15407	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) = ((abs‘(∗‘∫𝐴𝐵 d𝑥)) · (abs‘⦋𝑦 / 𝑥⦌𝐵)))
28	27	mpteq2dva 5241	. . . . . . . . . 10 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵))) = (𝑦 ∈ 𝐴 ↦ ((abs‘(∗‘∫𝐴𝐵 d𝑥)) · (abs‘⦋𝑦 / 𝑥⦌𝐵))))
29	6, 1	mbfdm2 25521	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐴 ∈ dom vol)
30	22	abscld 15389	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘(∗‘∫𝐴𝐵 d𝑥)) ∈ ℝ)
31	16	abscld 15389	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘⦋𝑦 / 𝑥⦌𝐵) ∈ ℝ)
32		fconstmpt 5731	. . . . . . . . . . . 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 2897	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑦(abs‘𝐵)
35		nfcv 2897	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑥abs
36	35, 10	nffv 6895	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑥(abs‘⦋𝑦 / 𝑥⦌𝐵)
37	12	fveq2d 6889	. . . . . . . . . . . . 13 ⊢ (𝑥 = 𝑦 → (abs‘𝐵) = (abs‘⦋𝑦 / 𝑥⦌𝐵))
38	34, 36, 37	cbvmpt 5252	. . . . . . . . . . . 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 7687	. . . . . . . . . 10 ⊢ (𝜑 → ((𝐴 × {(abs‘(∗‘∫𝐴𝐵 d𝑥))}) ∘_f · (𝑥 ∈ 𝐴 ↦ (abs‘𝐵))) = (𝑦 ∈ 𝐴 ↦ ((abs‘(∗‘∫𝐴𝐵 d𝑥)) · (abs‘⦋𝑦 / 𝑥⦌𝐵))))
41	28, 40	eqtr4d 2769	. . . . . . . . 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 15389	. . . . . . . . . 10 ⊢ (𝜑 → (abs‘(∗‘∫𝐴𝐵 d𝑥)) ∈ ℝ)
44	7	abscld 15389	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (abs‘𝐵) ∈ ℝ)
45	44	recnd 11246	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (abs‘𝐵) ∈ ℂ)
46	45	fmpttd 7110	. . . . . . . . . 10 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (abs‘𝐵)):𝐴⟶ℂ)
47	42, 43, 46	mbfmulc2re 25532	. . . . . . . . 9 ⊢ (𝜑 → ((𝐴 × {(abs‘(∗‘∫𝐴𝐵 d𝑥))}) ∘_f · (𝑥 ∈ 𝐴 ↦ (abs‘𝐵))) ∈ MblFn)
48	41, 47	eqeltrd 2827	. . . . . . . 8 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵))) ∈ MblFn)
49	23, 21, 48	iblabsnc 37065	. . . . . . 7 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵))) ∈ 𝐿¹)
50	23	recld 15147	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) ∈ ℝ)
51	23	abscld 15389	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) ∈ ℝ)
52	23	releabsd 15404	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) ≤ (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)))
53	26, 49, 50, 51, 52	itgle 25694	. . . . . 6 ⊢ (𝜑 → ∫𝐴(ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦 ≤ ∫𝐴(abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
54	3	abscld 15389	. . . . . . . . 9 ⊢ (𝜑 → (abs‘∫𝐴𝐵 d𝑥) ∈ ℝ)
55	54	recnd 11246	. . . . . . . 8 ⊢ (𝜑 → (abs‘∫𝐴𝐵 d𝑥) ∈ ℂ)
56	55	sqvald 14113	. . . . . . 7 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥)↑2) = ((abs‘∫𝐴𝐵 d𝑥) · (abs‘∫𝐴𝐵 d𝑥)))
57	3	absvalsqd 15395	. . . . . . . . . 10 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥)↑2) = (∫𝐴𝐵 d𝑥 · (∗‘∫𝐴𝐵 d𝑥)))
58	3, 4	mulcomd 11239	. . . . . . . . . 10 ⊢ (𝜑 → (∫𝐴𝐵 d𝑥 · (∗‘∫𝐴𝐵 d𝑥)) = ((∗‘∫𝐴𝐵 d𝑥) · ∫𝐴𝐵 d𝑥))
59	12, 17, 10	cbvitg 25660	. . . . . . . . . . . 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 37069	. . . . . . . . . . 11 ⊢ (𝜑 → ((∗‘∫𝐴𝐵 d𝑥) · ∫𝐴⦋𝑦 / 𝑥⦌𝐵 d𝑦) = ∫𝐴((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) d𝑦)
62	60, 61	eqtrid 2778	. . . . . . . . . 10 ⊢ (𝜑 → ((∗‘∫𝐴𝐵 d𝑥) · ∫𝐴𝐵 d𝑥) = ∫𝐴((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) d𝑦)
63	57, 58, 62	3eqtrd 2770	. . . . . . . . 9 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥)↑2) = ∫𝐴((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) d𝑦)
64	63	fveq2d 6889	. . . . . . . 8 ⊢ (𝜑 → (ℜ‘((abs‘∫𝐴𝐵 d𝑥)↑2)) = (ℜ‘∫𝐴((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) d𝑦))
65	54	resqcld 14095	. . . . . . . . 9 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥)↑2) ∈ ℝ)
66	65	rered 15177	. . . . . . . 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 25685	. . . . . . . 8 ⊢ (𝜑 → (ℜ‘∫𝐴((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) d𝑦) = ∫𝐴(ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
69	64, 66, 68	3eqtr3d 2774	. . . . . . 7 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥)↑2) = ∫𝐴(ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
70	56, 69	eqtr3d 2768	. . . . . 6 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥) · (abs‘∫𝐴𝐵 d𝑥)) = ∫𝐴(ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
71	37, 34, 36	cbvitg 25660	. . . . . . . 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 37065	. . . . . . . . . 10 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (abs‘𝐵)) ∈ 𝐿¹)
74	38, 73	eqeltrrid 2832	. . . . . . . . 9 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ (abs‘⦋𝑦 / 𝑥⦌𝐵)) ∈ 𝐿¹)
75	54	adantr 480	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘∫𝐴𝐵 d𝑥) ∈ ℝ)
76		fconstmpt 5731	. . . . . . . . . . . 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 7687	. . . . . . . . . 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 25532	. . . . . . . . . 10 ⊢ (𝜑 → ((𝐴 × {(abs‘∫𝐴𝐵 d𝑥)}) ∘_f · (𝑥 ∈ 𝐴 ↦ (abs‘𝐵))) ∈ MblFn)
80	78, 79	eqeltrrd 2828	. . . . . . . . 9 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ ((abs‘∫𝐴𝐵 d𝑥) · (abs‘⦋𝑦 / 𝑥⦌𝐵))) ∈ MblFn)
81	55, 31, 74, 80	itgmulc2nc 37069	. . . . . . . 8 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘⦋𝑦 / 𝑥⦌𝐵) d𝑦) = ∫𝐴((abs‘∫𝐴𝐵 d𝑥) · (abs‘⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
82	3	adantr 480	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → ∫𝐴𝐵 d𝑥 ∈ ℂ)
83	82	abscjd 15403	. . . . . . . . . . 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 2766	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) = ((abs‘∫𝐴𝐵 d𝑥) · (abs‘⦋𝑦 / 𝑥⦌𝐵)))
86	85	itgeq2dv 25666	. . . . . . . 8 ⊢ (𝜑 → ∫𝐴(abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦 = ∫𝐴((abs‘∫𝐴𝐵 d𝑥) · (abs‘⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
87	81, 86	eqtr4d 2769	. . . . . . 7 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘⦋𝑦 / 𝑥⦌𝐵) d𝑦) = ∫𝐴(abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
88	72, 87	eqtrid 2778	. . . . . 6 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘𝐵) d𝑥) = ∫𝐴(abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
89	53, 70, 88	3brtr4d 5173	. . . . 5 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥) · (abs‘∫𝐴𝐵 d𝑥)) ≤ ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘𝐵) d𝑥))
90	89	adantr 480	. . . 4 ⊢ ((𝜑 ∧ 0 < (abs‘∫𝐴𝐵 d𝑥)) → ((abs‘∫𝐴𝐵 d𝑥) · (abs‘∫𝐴𝐵 d𝑥)) ≤ ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘𝐵) d𝑥))
91	54	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 0 < (abs‘∫𝐴𝐵 d𝑥)) → (abs‘∫𝐴𝐵 d𝑥) ∈ ℝ)
92	44, 73	itgrecl 25682	. . . . . 6 ⊢ (𝜑 → ∫𝐴(abs‘𝐵) d𝑥 ∈ ℝ)
93	92	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 0 < (abs‘∫𝐴𝐵 d𝑥)) → ∫𝐴(abs‘𝐵) d𝑥 ∈ ℝ)
94		simpr 484	. . . . 5 ⊢ ((𝜑 ∧ 0 < (abs‘∫𝐴𝐵 d𝑥)) → 0 < (abs‘∫𝐴𝐵 d𝑥))
95		lemul2 12071	. . . . 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 1371	. . . 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 257	. . 3 ⊢ ((𝜑 ∧ 0 < (abs‘∫𝐴𝐵 d𝑥)) → (abs‘∫𝐴𝐵 d𝑥) ≤ ∫𝐴(abs‘𝐵) d𝑥)
98	97	ex 412	. 2 ⊢ (𝜑 → (0 < (abs‘∫𝐴𝐵 d𝑥) → (abs‘∫𝐴𝐵 d𝑥) ≤ ∫𝐴(abs‘𝐵) d𝑥))
99	7	absge0d 15397	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 0 ≤ (abs‘𝐵))
100	73, 44, 99	itgge0 25695	. . 3 ⊢ (𝜑 → 0 ≤ ∫𝐴(abs‘𝐵) d𝑥)
101		breq1 5144	. . 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 15397	. . 3 ⊢ (𝜑 → 0 ≤ (abs‘∫𝐴𝐵 d𝑥))
104		0re 11220	. . . 4 ⊢ 0 ∈ ℝ
105		leloe 11304	. . . 4 ⊢ ((0 ∈ ℝ ∧ (abs‘∫𝐴𝐵 d𝑥) ∈ ℝ) → (0 ≤ (abs‘∫𝐴𝐵 d𝑥) ↔ (0 < (abs‘∫𝐴𝐵 d𝑥) ∨ 0 = (abs‘∫𝐴𝐵 d𝑥))))
106	104, 54, 105	sylancr 586	. . 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 857	1 ⊢ (𝜑 → (abs‘∫𝐴𝐵 d𝑥) ≤ ∫𝐴(abs‘𝐵) d𝑥)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∨ wo 844 = wceq 1533 ∈ wcel 2098 ∀wral 3055 Vcvv 3468 ⦋csb 3888 {csn 4623 class class class wbr 5141 ↦ cmpt 5224 × cxp 5667 dom cdm 5669 ‘cfv 6537 (class class class)co 7405 ∘_f cof 7665 ℂcc 11110 ℝcr 11111 0cc0 11112 · cmul 11117 < clt 11252 ≤ cle 11253 2c2 12271 ↑cexp 14032 ∗ccj 15049 ℜcre 15050 ℑcim 15051 abscabs 15187 volcvol 25347 MblFncmbf 25498 𝐿¹cibl 25501 ∫citg 25502

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 7722 ax-inf2 9638 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189 ax-pre-sup 11190 ax-addf 11191

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 6294 df-ord 6361 df-on 6362 df-lim 6363 df-suc 6364 df-iota 6489 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-isom 6546 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-of 7667 df-ofr 7668 df-om 7853 df-1st 7974 df-2nd 7975 df-frecs 8267 df-wrecs 8298 df-recs 8372 df-rdg 8411 df-1o 8467 df-2o 8468 df-er 8705 df-map 8824 df-pm 8825 df-en 8942 df-dom 8943 df-sdom 8944 df-fin 8945 df-fi 9408 df-sup 9439 df-inf 9440 df-oi 9507 df-dju 9898 df-card 9936 df-pnf 11254 df-mnf 11255 df-xr 11256 df-ltxr 11257 df-le 11258 df-sub 11450 df-neg 11451 df-div 11876 df-nn 12217 df-2 12279 df-3 12280 df-4 12281 df-n0 12477 df-z 12563 df-uz 12827 df-q 12937 df-rp 12981 df-xneg 13098 df-xadd 13099 df-xmul 13100 df-ioo 13334 df-ico 13336 df-icc 13337 df-fz 13491 df-fzo 13634 df-fl 13763 df-mod 13841 df-seq 13973 df-exp 14033 df-hash 14296 df-cj 15052 df-re 15053 df-im 15054 df-sqrt 15188 df-abs 15189 df-clim 15438 df-sum 15639 df-rest 17377 df-topgen 17398 df-psmet 21232 df-xmet 21233 df-met 21234 df-bl 21235 df-mopn 21236 df-top 22751 df-topon 22768 df-bases 22804 df-cmp 23246 df-ovol 25348 df-vol 25349 df-mbf 25503 df-itg1 25504 df-itg2 25505 df-ibl 25506 df-itg 25507 df-0p 25554

This theorem is referenced by: ftc1cnnclem 37072 ftc2nc 37083

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