itgabsnc - Mathbox for Brendan Leahy

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Theorem itgabsnc 37191

Description: Choice-free analogue of itgabs 25780. (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 25729	. . . . . . . . . . 11 ⊢ (𝜑 → ∫𝐴𝐵 d𝑥 ∈ ℂ)
4	3	cjcld 15173	. . . . . . . . . 10 ⊢ (𝜑 → (∗‘∫𝐴𝐵 d𝑥) ∈ ℂ)
5		iblmbf 25713	. . . . . . . . . . . . . . 15 ⊢ ((𝑥 ∈ 𝐴 ↦ 𝐵) ∈ 𝐿¹ → (𝑥 ∈ 𝐴 ↦ 𝐵) ∈ MblFn)
6	2, 5	syl 17	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵) ∈ MblFn)
7	6, 1	mbfmptcl 25581	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℂ)
8	7	ralrimiva 3136	. . . . . . . . . . . 12 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 𝐵 ∈ ℂ)
9		nfv 1909	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑦 𝐵 ∈ ℂ
10		nfcsb1v 3909	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑥⦋𝑦 / 𝑥⦌𝐵
11	10	nfel1 2909	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑥⦋𝑦 / 𝑥⦌𝐵 ∈ ℂ
12		csbeq1a 3898	. . . . . . . . . . . . . 14 ⊢ (𝑥 = 𝑦 → 𝐵 = ⦋𝑦 / 𝑥⦌𝐵)
13	12	eleq1d 2810	. . . . . . . . . . . . 13 ⊢ (𝑥 = 𝑦 → (𝐵 ∈ ℂ ↔ ⦋𝑦 / 𝑥⦌𝐵 ∈ ℂ))
14	9, 11, 13	cbvralw 3294	. . . . . . . . . . . 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 3239	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → ⦋𝑦 / 𝑥⦌𝐵 ∈ ℂ)
17		nfcv 2892	. . . . . . . . . . . 12 ⊢ Ⅎ𝑦𝐵
18	17, 10, 12	cbvmpt 5252	. . . . . . . . . . 11 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑦 ∈ 𝐴 ↦ ⦋𝑦 / 𝑥⦌𝐵)
19	18, 2	eqeltrrid 2830	. . . . . . . . . 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 37187	. . . . . . . . 9 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ ((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) ∈ 𝐿¹)
22	4	adantr 479	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (∗‘∫𝐴𝐵 d𝑥) ∈ ℂ)
23	22, 16	mulcld 11262	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → ((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) ∈ ℂ)
24	23	iblcn 25744	. . . . . . . . 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 493	. . . . . . 7 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ (ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵))) ∈ 𝐿¹)
27	22, 16	absmuld 15431	. . . . . . . . . . 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 25582	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐴 ∈ dom vol)
30	22	abscld 15413	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘(∗‘∫𝐴𝐵 d𝑥)) ∈ ℝ)
31	16	abscld 15413	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘⦋𝑦 / 𝑥⦌𝐵) ∈ ℝ)
32		fconstmpt 5732	. . . . . . . . . . . 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 2892	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑦(abs‘𝐵)
35		nfcv 2892	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑥abs
36	35, 10	nffv 6900	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑥(abs‘⦋𝑦 / 𝑥⦌𝐵)
37	12	fveq2d 6894	. . . . . . . . . . . . 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 7700	. . . . . . . . . 10 ⊢ (𝜑 → ((𝐴 × {(abs‘(∗‘∫𝐴𝐵 d𝑥))}) ∘_f · (𝑥 ∈ 𝐴 ↦ (abs‘𝐵))) = (𝑦 ∈ 𝐴 ↦ ((abs‘(∗‘∫𝐴𝐵 d𝑥)) · (abs‘⦋𝑦 / 𝑥⦌𝐵))))
41	28, 40	eqtr4d 2768	. . . . . . . . 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 15413	. . . . . . . . . 10 ⊢ (𝜑 → (abs‘(∗‘∫𝐴𝐵 d𝑥)) ∈ ℝ)
44	7	abscld 15413	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (abs‘𝐵) ∈ ℝ)
45	44	recnd 11270	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (abs‘𝐵) ∈ ℂ)
46	45	fmpttd 7118	. . . . . . . . . 10 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (abs‘𝐵)):𝐴⟶ℂ)
47	42, 43, 46	mbfmulc2re 25593	. . . . . . . . 9 ⊢ (𝜑 → ((𝐴 × {(abs‘(∗‘∫𝐴𝐵 d𝑥))}) ∘_f · (𝑥 ∈ 𝐴 ↦ (abs‘𝐵))) ∈ MblFn)
48	41, 47	eqeltrd 2825	. . . . . . . 8 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵))) ∈ MblFn)
49	23, 21, 48	iblabsnc 37186	. . . . . . 7 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵))) ∈ 𝐿¹)
50	23	recld 15171	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) ∈ ℝ)
51	23	abscld 15413	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) ∈ ℝ)
52	23	releabsd 15428	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) ≤ (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)))
53	26, 49, 50, 51, 52	itgle 25755	. . . . . 6 ⊢ (𝜑 → ∫𝐴(ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦 ≤ ∫𝐴(abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
54	3	abscld 15413	. . . . . . . . 9 ⊢ (𝜑 → (abs‘∫𝐴𝐵 d𝑥) ∈ ℝ)
55	54	recnd 11270	. . . . . . . 8 ⊢ (𝜑 → (abs‘∫𝐴𝐵 d𝑥) ∈ ℂ)
56	55	sqvald 14137	. . . . . . 7 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥)↑2) = ((abs‘∫𝐴𝐵 d𝑥) · (abs‘∫𝐴𝐵 d𝑥)))
57	3	absvalsqd 15419	. . . . . . . . . 10 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥)↑2) = (∫𝐴𝐵 d𝑥 · (∗‘∫𝐴𝐵 d𝑥)))
58	3, 4	mulcomd 11263	. . . . . . . . . 10 ⊢ (𝜑 → (∫𝐴𝐵 d𝑥 · (∗‘∫𝐴𝐵 d𝑥)) = ((∗‘∫𝐴𝐵 d𝑥) · ∫𝐴𝐵 d𝑥))
59	12, 17, 10	cbvitg 25721	. . . . . . . . . . . 12 ⊢ ∫𝐴𝐵 d𝑥 = ∫𝐴⦋𝑦 / 𝑥⦌𝐵 d𝑦
60	59	oveq2i 7425	. . . . . . . . . . 11 ⊢ ((∗‘∫𝐴𝐵 d𝑥) · ∫𝐴𝐵 d𝑥) = ((∗‘∫𝐴𝐵 d𝑥) · ∫𝐴⦋𝑦 / 𝑥⦌𝐵 d𝑦)
61	4, 16, 19, 20	itgmulc2nc 37190	. . . . . . . . . . 11 ⊢ (𝜑 → ((∗‘∫𝐴𝐵 d𝑥) · ∫𝐴⦋𝑦 / 𝑥⦌𝐵 d𝑦) = ∫𝐴((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) d𝑦)
62	60, 61	eqtrid 2777	. . . . . . . . . 10 ⊢ (𝜑 → ((∗‘∫𝐴𝐵 d𝑥) · ∫𝐴𝐵 d𝑥) = ∫𝐴((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) d𝑦)
63	57, 58, 62	3eqtrd 2769	. . . . . . . . 9 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥)↑2) = ∫𝐴((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) d𝑦)
64	63	fveq2d 6894	. . . . . . . 8 ⊢ (𝜑 → (ℜ‘((abs‘∫𝐴𝐵 d𝑥)↑2)) = (ℜ‘∫𝐴((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) d𝑦))
65	54	resqcld 14119	. . . . . . . . 9 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥)↑2) ∈ ℝ)
66	65	rered 15201	. . . . . . . 8 ⊢ (𝜑 → (ℜ‘((abs‘∫𝐴𝐵 d𝑥)↑2)) = ((abs‘∫𝐴𝐵 d𝑥)↑2))
67		ovexd 7449	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → ((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) ∈ V)
68	67, 21	itgre 25746	. . . . . . . 8 ⊢ (𝜑 → (ℜ‘∫𝐴((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵) d𝑦) = ∫𝐴(ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
69	64, 66, 68	3eqtr3d 2773	. . . . . . 7 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥)↑2) = ∫𝐴(ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
70	56, 69	eqtr3d 2767	. . . . . 6 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥) · (abs‘∫𝐴𝐵 d𝑥)) = ∫𝐴(ℜ‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
71	37, 34, 36	cbvitg 25721	. . . . . . . 8 ⊢ ∫𝐴(abs‘𝐵) d𝑥 = ∫𝐴(abs‘⦋𝑦 / 𝑥⦌𝐵) d𝑦
72	71	oveq2i 7425	. . . . . . 7 ⊢ ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘𝐵) d𝑥) = ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘⦋𝑦 / 𝑥⦌𝐵) d𝑦)
73	1, 2, 42	iblabsnc 37186	. . . . . . . . . 10 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (abs‘𝐵)) ∈ 𝐿¹)
74	38, 73	eqeltrrid 2830	. . . . . . . . 9 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ (abs‘⦋𝑦 / 𝑥⦌𝐵)) ∈ 𝐿¹)
75	54	adantr 479	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘∫𝐴𝐵 d𝑥) ∈ ℝ)
76		fconstmpt 5732	. . . . . . . . . . . 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 7700	. . . . . . . . . 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 25593	. . . . . . . . . 10 ⊢ (𝜑 → ((𝐴 × {(abs‘∫𝐴𝐵 d𝑥)}) ∘_f · (𝑥 ∈ 𝐴 ↦ (abs‘𝐵))) ∈ MblFn)
80	78, 79	eqeltrrd 2826	. . . . . . . . 9 ⊢ (𝜑 → (𝑦 ∈ 𝐴 ↦ ((abs‘∫𝐴𝐵 d𝑥) · (abs‘⦋𝑦 / 𝑥⦌𝐵))) ∈ MblFn)
81	55, 31, 74, 80	itgmulc2nc 37190	. . . . . . . 8 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘⦋𝑦 / 𝑥⦌𝐵) d𝑦) = ∫𝐴((abs‘∫𝐴𝐵 d𝑥) · (abs‘⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
82	3	adantr 479	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → ∫𝐴𝐵 d𝑥 ∈ ℂ)
83	82	abscjd 15427	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘(∗‘∫𝐴𝐵 d𝑥)) = (abs‘∫𝐴𝐵 d𝑥))
84	83	oveq1d 7429	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → ((abs‘(∗‘∫𝐴𝐵 d𝑥)) · (abs‘⦋𝑦 / 𝑥⦌𝐵)) = ((abs‘∫𝐴𝐵 d𝑥) · (abs‘⦋𝑦 / 𝑥⦌𝐵)))
85	27, 84	eqtrd 2765	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) = ((abs‘∫𝐴𝐵 d𝑥) · (abs‘⦋𝑦 / 𝑥⦌𝐵)))
86	85	itgeq2dv 25727	. . . . . . . 8 ⊢ (𝜑 → ∫𝐴(abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦 = ∫𝐴((abs‘∫𝐴𝐵 d𝑥) · (abs‘⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
87	81, 86	eqtr4d 2768	. . . . . . 7 ⊢ (𝜑 → ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘⦋𝑦 / 𝑥⦌𝐵) d𝑦) = ∫𝐴(abs‘((∗‘∫𝐴𝐵 d𝑥) · ⦋𝑦 / 𝑥⦌𝐵)) d𝑦)
88	72, 87	eqtrid 2777	. . . . . 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 479	. . . 4 ⊢ ((𝜑 ∧ 0 < (abs‘∫𝐴𝐵 d𝑥)) → ((abs‘∫𝐴𝐵 d𝑥) · (abs‘∫𝐴𝐵 d𝑥)) ≤ ((abs‘∫𝐴𝐵 d𝑥) · ∫𝐴(abs‘𝐵) d𝑥))
91	54	adantr 479	. . . . 5 ⊢ ((𝜑 ∧ 0 < (abs‘∫𝐴𝐵 d𝑥)) → (abs‘∫𝐴𝐵 d𝑥) ∈ ℝ)
92	44, 73	itgrecl 25743	. . . . . 6 ⊢ (𝜑 → ∫𝐴(abs‘𝐵) d𝑥 ∈ ℝ)
93	92	adantr 479	. . . . 5 ⊢ ((𝜑 ∧ 0 < (abs‘∫𝐴𝐵 d𝑥)) → ∫𝐴(abs‘𝐵) d𝑥 ∈ ℝ)
94		simpr 483	. . . . 5 ⊢ ((𝜑 ∧ 0 < (abs‘∫𝐴𝐵 d𝑥)) → 0 < (abs‘∫𝐴𝐵 d𝑥))
95		lemul2 12095	. . . . 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 256	. . 3 ⊢ ((𝜑 ∧ 0 < (abs‘∫𝐴𝐵 d𝑥)) → (abs‘∫𝐴𝐵 d𝑥) ≤ ∫𝐴(abs‘𝐵) d𝑥)
98	97	ex 411	. 2 ⊢ (𝜑 → (0 < (abs‘∫𝐴𝐵 d𝑥) → (abs‘∫𝐴𝐵 d𝑥) ≤ ∫𝐴(abs‘𝐵) d𝑥))
99	7	absge0d 15421	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 0 ≤ (abs‘𝐵))
100	73, 44, 99	itgge0 25756	. . 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 15421	. . 3 ⊢ (𝜑 → 0 ≤ (abs‘∫𝐴𝐵 d𝑥))
104		0re 11244	. . . 4 ⊢ 0 ∈ ℝ
105		leloe 11328	. . . 4 ⊢ ((0 ∈ ℝ ∧ (abs‘∫𝐴𝐵 d𝑥) ∈ ℝ) → (0 ≤ (abs‘∫𝐴𝐵 d𝑥) ↔ (0 < (abs‘∫𝐴𝐵 d𝑥) ∨ 0 = (abs‘∫𝐴𝐵 d𝑥))))
106	104, 54, 105	sylancr 585	. . 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 394 ∨ wo 845 = wceq 1533 ∈ wcel 2098 ∀wral 3051 Vcvv 3463 ⦋csb 3884 {csn 4622 class class class wbr 5141 ↦ cmpt 5224 × cxp 5668 dom cdm 5670 ‘cfv 6541 (class class class)co 7414 ∘_f cof 7678 ℂcc 11134 ℝcr 11135 0cc0 11136 · cmul 11141 < clt 11276 ≤ cle 11277 2c2 12295 ↑cexp 14056 ∗ccj 15073 ℜcre 15074 ℑcim 15075 abscabs 15211 volcvol 25408 MblFncmbf 25559 𝐿¹cibl 25562 ∫citg 25563

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 2166 ax-ext 2696 ax-rep 5278 ax-sep 5292 ax-nul 5299 ax-pow 5357 ax-pr 5421 ax-un 7736 ax-inf2 9662 ax-cnex 11192 ax-resscn 11193 ax-1cn 11194 ax-icn 11195 ax-addcl 11196 ax-addrcl 11197 ax-mulcl 11198 ax-mulrcl 11199 ax-mulcom 11200 ax-addass 11201 ax-mulass 11202 ax-distr 11203 ax-i2m1 11204 ax-1ne0 11205 ax-1rid 11206 ax-rnegex 11207 ax-rrecex 11208 ax-cnre 11209 ax-pre-lttri 11210 ax-pre-lttrn 11211 ax-pre-ltadd 11212 ax-pre-mulgt0 11213 ax-pre-sup 11214 ax-addf 11215

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 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 2703 df-cleq 2717 df-clel 2802 df-nfc 2877 df-ne 2931 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3364 df-reu 3365 df-rab 3420 df-v 3465 df-sbc 3769 df-csb 3885 df-dif 3942 df-un 3944 df-in 3946 df-ss 3956 df-pss 3958 df-nul 4317 df-if 4523 df-pw 4598 df-sn 4623 df-pr 4625 df-op 4629 df-uni 4902 df-int 4943 df-iun 4991 df-disj 5107 df-br 5142 df-opab 5204 df-mpt 5225 df-tr 5259 df-id 5568 df-eprel 5574 df-po 5582 df-so 5583 df-fr 5625 df-se 5626 df-we 5627 df-xp 5676 df-rel 5677 df-cnv 5678 df-co 5679 df-dm 5680 df-rn 5681 df-res 5682 df-ima 5683 df-pred 6298 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6493 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 df-fo 6547 df-f1o 6548 df-fv 6549 df-isom 6550 df-riota 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 df-of 7680 df-ofr 7681 df-om 7867 df-1st 7989 df-2nd 7990 df-frecs 8283 df-wrecs 8314 df-recs 8388 df-rdg 8427 df-1o 8483 df-2o 8484 df-er 8721 df-map 8843 df-pm 8844 df-en 8961 df-dom 8962 df-sdom 8963 df-fin 8964 df-fi 9432 df-sup 9463 df-inf 9464 df-oi 9531 df-dju 9922 df-card 9960 df-pnf 11278 df-mnf 11279 df-xr 11280 df-ltxr 11281 df-le 11282 df-sub 11474 df-neg 11475 df-div 11900 df-nn 12241 df-2 12303 df-3 12304 df-4 12305 df-n0 12501 df-z 12587 df-uz 12851 df-q 12961 df-rp 13005 df-xneg 13122 df-xadd 13123 df-xmul 13124 df-ioo 13358 df-ico 13360 df-icc 13361 df-fz 13515 df-fzo 13658 df-fl 13787 df-mod 13865 df-seq 13997 df-exp 14057 df-hash 14320 df-cj 15076 df-re 15077 df-im 15078 df-sqrt 15212 df-abs 15213 df-clim 15462 df-sum 15663 df-rest 17401 df-topgen 17422 df-psmet 21273 df-xmet 21274 df-met 21275 df-bl 21276 df-mopn 21277 df-top 22812 df-topon 22829 df-bases 22865 df-cmp 23307 df-ovol 25409 df-vol 25410 df-mbf 25564 df-itg1 25565 df-itg2 25566 df-ibl 25567 df-itg 25568 df-0p 25615

This theorem is referenced by: ftc1cnnclem 37193 ftc2nc 37204

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