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Theorem iblabslem 26040

Description: Lemma for iblabs 26041. (Contributed by Mario Carneiro, 25-Aug-2014.)

**Hypotheses**
Ref	Expression
iblabs.1	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ 𝑉)
iblabs.2	⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵) ∈ 𝐿¹)
iblabs.3	⊢ 𝐺 = (𝑥 ∈ ℝ ↦ if(𝑥 ∈ 𝐴, (abs‘(𝐹‘𝐵)), 0))
iblabs.4	⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (𝐹‘𝐵)) ∈ 𝐿¹)
iblabs.5	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝐵) ∈ ℝ)

**Assertion**
Ref	Expression
iblabslem	⊢ (𝜑 → (𝐺 ∈ MblFn ∧ (∫₂‘𝐺) ∈ ℝ))

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

**Proof of Theorem iblabslem**
Step	Hyp	Ref	Expression
1		iblabs.3	. . 3 ⊢ 𝐺 = (𝑥 ∈ ℝ ↦ if(𝑥 ∈ 𝐴, (abs‘(𝐹‘𝐵)), 0))
2		iblabs.4	. . . . . . . 8 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (𝐹‘𝐵)) ∈ 𝐿¹)
3		iblabs.5	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝐵) ∈ ℝ)
4	3	iblrelem 26003	. . . . . . . 8 ⊢ (𝜑 → ((𝑥 ∈ 𝐴 ↦ (𝐹‘𝐵)) ∈ 𝐿¹ ↔ ((𝑥 ∈ 𝐴 ↦ (𝐹‘𝐵)) ∈ MblFn ∧ (∫₂‘(𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0))) ∈ ℝ ∧ (∫₂‘(𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0))) ∈ ℝ)))
5	2, 4	mpbid 235	. . . . . . 7 ⊢ (𝜑 → ((𝑥 ∈ 𝐴 ↦ (𝐹‘𝐵)) ∈ MblFn ∧ (∫₂‘(𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0))) ∈ ℝ ∧ (∫₂‘(𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0))) ∈ ℝ))
6	5	simp1d 1160	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (𝐹‘𝐵)) ∈ MblFn)
7	6, 3	mbfdm2 25849	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ dom vol)
8		mblss 25743	. . . . 5 ⊢ (𝐴 ∈ dom vol → 𝐴 ⊆ ℝ)
9	7, 8	syl 18	. . . 4 ⊢ (𝜑 → 𝐴 ⊆ ℝ)
10		rembl 25752	. . . . 5 ⊢ ℝ ∈ dom vol
11	10	a1i 11	. . . 4 ⊢ (𝜑 → ℝ ∈ dom vol)
12		iftrue 4495	. . . . . 6 ⊢ (𝑥 ∈ 𝐴 → if(𝑥 ∈ 𝐴, (abs‘(𝐹‘𝐵)), 0) = (abs‘(𝐹‘𝐵)))
13	12	adantl 487	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → if(𝑥 ∈ 𝐴, (abs‘(𝐹‘𝐵)), 0) = (abs‘(𝐹‘𝐵)))
14	3	recnd 11254	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝐵) ∈ ℂ)
15	14	abscld 15516	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (abs‘(𝐹‘𝐵)) ∈ ℝ)
16	13, 15	eqeltrd 2865	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → if(𝑥 ∈ 𝐴, (abs‘(𝐹‘𝐵)), 0) ∈ ℝ)
17		eldifn 4086	. . . . . 6 ⊢ (𝑥 ∈ (ℝ ∖ 𝐴) → ¬ 𝑥 ∈ 𝐴)
18	17	adantl 487	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ (ℝ ∖ 𝐴)) → ¬ 𝑥 ∈ 𝐴)
19		iffalse 4498	. . . . 5 ⊢ (¬ 𝑥 ∈ 𝐴 → if(𝑥 ∈ 𝐴, (abs‘(𝐹‘𝐵)), 0) = 0)
20	18, 19	syl 18	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ (ℝ ∖ 𝐴)) → if(𝑥 ∈ 𝐴, (abs‘(𝐹‘𝐵)), 0) = 0)
21	12	mpteq2ia 5208	. . . . . 6 ⊢ (𝑥 ∈ 𝐴 ↦ if(𝑥 ∈ 𝐴, (abs‘(𝐹‘𝐵)), 0)) = (𝑥 ∈ 𝐴 ↦ (abs‘(𝐹‘𝐵)))
22		absf 15415	. . . . . . . 8 ⊢ abs:ℂ⟶ℝ
23	22	a1i 11	. . . . . . 7 ⊢ (𝜑 → abs:ℂ⟶ℝ)
24	23, 14	cofmpt 7132	. . . . . 6 ⊢ (𝜑 → (abs ∘ (𝑥 ∈ 𝐴 ↦ (𝐹‘𝐵))) = (𝑥 ∈ 𝐴 ↦ (abs‘(𝐹‘𝐵))))
25	21, 24	eqtr4id 2819	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ if(𝑥 ∈ 𝐴, (abs‘(𝐹‘𝐵)), 0)) = (abs ∘ (𝑥 ∈ 𝐴 ↦ (𝐹‘𝐵))))
26	14	fmpttd 7114	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (𝐹‘𝐵)):𝐴⟶ℂ)
27		ax-resscn 11174	. . . . . . . . 9 ⊢ ℝ ⊆ ℂ
28		ssid 3960	. . . . . . . . 9 ⊢ ℂ ⊆ ℂ
29		cncfss 25111	. . . . . . . . 9 ⊢ ((ℝ ⊆ ℂ ∧ ℂ ⊆ ℂ) → (ℂ–cn→ℝ) ⊆ (ℂ–cn→ℂ))
30	27, 28, 29	mp2an 705	. . . . . . . 8 ⊢ (ℂ–cn→ℝ) ⊆ (ℂ–cn→ℂ)
31		abscncf 25113	. . . . . . . 8 ⊢ abs ∈ (ℂ–cn→ℝ)
32	30, 31	sselii 3935	. . . . . . 7 ⊢ abs ∈ (ℂ–cn→ℂ)
33	32	a1i 11	. . . . . 6 ⊢ (𝜑 → abs ∈ (ℂ–cn→ℂ))
34		cncombf 25870	. . . . . 6 ⊢ (((𝑥 ∈ 𝐴 ↦ (𝐹‘𝐵)) ∈ MblFn ∧ (𝑥 ∈ 𝐴 ↦ (𝐹‘𝐵)):𝐴⟶ℂ ∧ abs ∈ (ℂ–cn→ℂ)) → (abs ∘ (𝑥 ∈ 𝐴 ↦ (𝐹‘𝐵))) ∈ MblFn)
35	6, 26, 33, 34	syl3anc 1398	. . . . 5 ⊢ (𝜑 → (abs ∘ (𝑥 ∈ 𝐴 ↦ (𝐹‘𝐵))) ∈ MblFn)
36	25, 35	eqeltrd 2865	. . . 4 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ if(𝑥 ∈ 𝐴, (abs‘(𝐹‘𝐵)), 0)) ∈ MblFn)
37	9, 11, 16, 20, 36	mbfss 25858	. . 3 ⊢ (𝜑 → (𝑥 ∈ ℝ ↦ if(𝑥 ∈ 𝐴, (abs‘(𝐹‘𝐵)), 0)) ∈ MblFn)
38	1, 37	eqeltrid 2869	. 2 ⊢ (𝜑 → 𝐺 ∈ MblFn)
39		reex 11208	. . . . . . . . 9 ⊢ ℝ ∈ V
40	39	a1i 11	. . . . . . . 8 ⊢ (𝜑 → ℝ ∈ V)
41		ifan 4543	. . . . . . . . . 10 ⊢ if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0) = if(𝑥 ∈ 𝐴, if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0), 0)
42		0re 11227	. . . . . . . . . . . . 13 ⊢ 0 ∈ ℝ
43		ifcl 4535	. . . . . . . . . . . . 13 ⊢ (((𝐹‘𝐵) ∈ ℝ ∧ 0 ∈ ℝ) → if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0) ∈ ℝ)
44	3, 42, 43	sylancl 598	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0) ∈ ℝ)
45		max1 13229	. . . . . . . . . . . . 13 ⊢ ((0 ∈ ℝ ∧ (𝐹‘𝐵) ∈ ℝ) → 0 ≤ if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0))
46	42, 3, 45	sylancr 599	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 0 ≤ if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0))
47		elrege0 13499	. . . . . . . . . . . 12 ⊢ (if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0) ∈ (0[,)+∞) ↔ (if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0) ∈ ℝ ∧ 0 ≤ if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0)))
48	44, 46, 47	sylanbrc 595	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0) ∈ (0[,)+∞))
49		0e0icopnf 13503	. . . . . . . . . . . 12 ⊢ 0 ∈ (0[,)+∞)
50	49	a1i 11	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ ¬ 𝑥 ∈ 𝐴) → 0 ∈ (0[,)+∞))
51	48, 50	ifclda 4525	. . . . . . . . . 10 ⊢ (𝜑 → if(𝑥 ∈ 𝐴, if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0), 0) ∈ (0[,)+∞))
52	41, 51	eqeltrid 2869	. . . . . . . . 9 ⊢ (𝜑 → if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0) ∈ (0[,)+∞))
53	52	adantr 486	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ) → if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0) ∈ (0[,)+∞))
54		ifan 4543	. . . . . . . . . 10 ⊢ if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0) = if(𝑥 ∈ 𝐴, if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0), 0)
55	3	renegcld 11658	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → -(𝐹‘𝐵) ∈ ℝ)
56		ifcl 4535	. . . . . . . . . . . . 13 ⊢ ((-(𝐹‘𝐵) ∈ ℝ ∧ 0 ∈ ℝ) → if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0) ∈ ℝ)
57	55, 42, 56	sylancl 598	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0) ∈ ℝ)
58		max1 13229	. . . . . . . . . . . . 13 ⊢ ((0 ∈ ℝ ∧ -(𝐹‘𝐵) ∈ ℝ) → 0 ≤ if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0))
59	42, 55, 58	sylancr 599	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 0 ≤ if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0))
60		elrege0 13499	. . . . . . . . . . . 12 ⊢ (if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0) ∈ (0[,)+∞) ↔ (if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0) ∈ ℝ ∧ 0 ≤ if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0)))
61	57, 59, 60	sylanbrc 595	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0) ∈ (0[,)+∞))
62	61, 50	ifclda 4525	. . . . . . . . . 10 ⊢ (𝜑 → if(𝑥 ∈ 𝐴, if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0), 0) ∈ (0[,)+∞))
63	54, 62	eqeltrid 2869	. . . . . . . . 9 ⊢ (𝜑 → if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0) ∈ (0[,)+∞))
64	63	adantr 486	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ) → if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0) ∈ (0[,)+∞))
65		eqidd 2766	. . . . . . . 8 ⊢ (𝜑 → (𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0)) = (𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0)))
66		eqidd 2766	. . . . . . . 8 ⊢ (𝜑 → (𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0)) = (𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0)))
67	40, 53, 64, 65, 66	offval2 7704	. . . . . . 7 ⊢ (𝜑 → ((𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0)) ∘_f + (𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0))) = (𝑥 ∈ ℝ ↦ (if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0) + if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0))))
68	41, 54	oveq12i 7431	. . . . . . . . 9 ⊢ (if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0) + if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0)) = (if(𝑥 ∈ 𝐴, if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0), 0) + if(𝑥 ∈ 𝐴, if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0), 0))
69		max0add 15387	. . . . . . . . . . . . 13 ⊢ ((𝐹‘𝐵) ∈ ℝ → (if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0) + if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0)) = (abs‘(𝐹‘𝐵)))
70	3, 69	syl 18	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0) + if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0)) = (abs‘(𝐹‘𝐵)))
71		iftrue 4495	. . . . . . . . . . . . . 14 ⊢ (𝑥 ∈ 𝐴 → if(𝑥 ∈ 𝐴, if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0), 0) = if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0))
72	71	adantl 487	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → if(𝑥 ∈ 𝐴, if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0), 0) = if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0))
73		iftrue 4495	. . . . . . . . . . . . . 14 ⊢ (𝑥 ∈ 𝐴 → if(𝑥 ∈ 𝐴, if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0), 0) = if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0))
74	73	adantl 487	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → if(𝑥 ∈ 𝐴, if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0), 0) = if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0))
75	72, 74	oveq12d 7437	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (if(𝑥 ∈ 𝐴, if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0), 0) + if(𝑥 ∈ 𝐴, if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0), 0)) = (if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0) + if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0)))
76	70, 75, 13	3eqtr4d 2810	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (if(𝑥 ∈ 𝐴, if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0), 0) + if(𝑥 ∈ 𝐴, if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0), 0)) = if(𝑥 ∈ 𝐴, (abs‘(𝐹‘𝐵)), 0))
77	76	ex 418	. . . . . . . . . 10 ⊢ (𝜑 → (𝑥 ∈ 𝐴 → (if(𝑥 ∈ 𝐴, if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0), 0) + if(𝑥 ∈ 𝐴, if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0), 0)) = if(𝑥 ∈ 𝐴, (abs‘(𝐹‘𝐵)), 0)))
78		00id 11402	. . . . . . . . . . 11 ⊢ (0 + 0) = 0
79		iffalse 4498	. . . . . . . . . . . 12 ⊢ (¬ 𝑥 ∈ 𝐴 → if(𝑥 ∈ 𝐴, if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0), 0) = 0)
80		iffalse 4498	. . . . . . . . . . . 12 ⊢ (¬ 𝑥 ∈ 𝐴 → if(𝑥 ∈ 𝐴, if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0), 0) = 0)
81	79, 80	oveq12d 7437	. . . . . . . . . . 11 ⊢ (¬ 𝑥 ∈ 𝐴 → (if(𝑥 ∈ 𝐴, if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0), 0) + if(𝑥 ∈ 𝐴, if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0), 0)) = (0 + 0))
82	78, 81, 19	3eqtr4a 2826	. . . . . . . . . 10 ⊢ (¬ 𝑥 ∈ 𝐴 → (if(𝑥 ∈ 𝐴, if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0), 0) + if(𝑥 ∈ 𝐴, if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0), 0)) = if(𝑥 ∈ 𝐴, (abs‘(𝐹‘𝐵)), 0))
83	77, 82	pm2.61d1 182	. . . . . . . . 9 ⊢ (𝜑 → (if(𝑥 ∈ 𝐴, if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0), 0) + if(𝑥 ∈ 𝐴, if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0), 0)) = if(𝑥 ∈ 𝐴, (abs‘(𝐹‘𝐵)), 0))
84	68, 83	eqtrid 2812	. . . . . . . 8 ⊢ (𝜑 → (if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0) + if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0)) = if(𝑥 ∈ 𝐴, (abs‘(𝐹‘𝐵)), 0))
85	84	mpteq2dv 5207	. . . . . . 7 ⊢ (𝜑 → (𝑥 ∈ ℝ ↦ (if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0) + if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0))) = (𝑥 ∈ ℝ ↦ if(𝑥 ∈ 𝐴, (abs‘(𝐹‘𝐵)), 0)))
86	67, 85	eqtrd 2800	. . . . . 6 ⊢ (𝜑 → ((𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0)) ∘_f + (𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0))) = (𝑥 ∈ ℝ ↦ if(𝑥 ∈ 𝐴, (abs‘(𝐹‘𝐵)), 0)))
87	1, 86	eqtr4id 2819	. . . . 5 ⊢ (𝜑 → 𝐺 = ((𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0)) ∘_f + (𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0))))
88	87	fveq2d 6889	. . . 4 ⊢ (𝜑 → (∫₂‘𝐺) = (∫₂‘((𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0)) ∘_f + (𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0)))))
89	52	adantr 486	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0) ∈ (0[,)+∞))
90	41, 79	eqtrid 2812	. . . . . . 7 ⊢ (¬ 𝑥 ∈ 𝐴 → if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0) = 0)
91	18, 90	syl 18	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (ℝ ∖ 𝐴)) → if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0) = 0)
92		ibar 538	. . . . . . . . 9 ⊢ (𝑥 ∈ 𝐴 → (0 ≤ (𝐹‘𝐵) ↔ (𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵))))
93	92	ifbid 4513	. . . . . . . 8 ⊢ (𝑥 ∈ 𝐴 → if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0) = if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0))
94	93	mpteq2ia 5208	. . . . . . 7 ⊢ (𝑥 ∈ 𝐴 ↦ if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0)) = (𝑥 ∈ 𝐴 ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0))
95	3, 6	mbfpos 25863	. . . . . . 7 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ if(0 ≤ (𝐹‘𝐵), (𝐹‘𝐵), 0)) ∈ MblFn)
96	94, 95	eqeltrrid 2870	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0)) ∈ MblFn)
97	9, 11, 89, 91, 96	mbfss 25858	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0)) ∈ MblFn)
98	53	fmpttd 7114	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0)):ℝ⟶(0[,)+∞))
99	5	simp2d 1161	. . . . 5 ⊢ (𝜑 → (∫₂‘(𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0))) ∈ ℝ)
100	63	adantr 486	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0) ∈ (0[,)+∞))
101	54, 80	eqtrid 2812	. . . . . . 7 ⊢ (¬ 𝑥 ∈ 𝐴 → if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0) = 0)
102	18, 101	syl 18	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (ℝ ∖ 𝐴)) → if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0) = 0)
103		ibar 538	. . . . . . . . 9 ⊢ (𝑥 ∈ 𝐴 → (0 ≤ -(𝐹‘𝐵) ↔ (𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵))))
104	103	ifbid 4513	. . . . . . . 8 ⊢ (𝑥 ∈ 𝐴 → if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0) = if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0))
105	104	mpteq2ia 5208	. . . . . . 7 ⊢ (𝑥 ∈ 𝐴 ↦ if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0)) = (𝑥 ∈ 𝐴 ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0))
106	3, 6	mbfneg 25862	. . . . . . . 8 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ -(𝐹‘𝐵)) ∈ MblFn)
107	55, 106	mbfpos 25863	. . . . . . 7 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ if(0 ≤ -(𝐹‘𝐵), -(𝐹‘𝐵), 0)) ∈ MblFn)
108	105, 107	eqeltrrid 2870	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0)) ∈ MblFn)
109	9, 11, 100, 102, 108	mbfss 25858	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0)) ∈ MblFn)
110	64	fmpttd 7114	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0)):ℝ⟶(0[,)+∞))
111	5	simp3d 1162	. . . . 5 ⊢ (𝜑 → (∫₂‘(𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0))) ∈ ℝ)
112	97, 98, 99, 109, 110, 111	itg2add 25971	. . . 4 ⊢ (𝜑 → (∫₂‘((𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0)) ∘_f + (𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0)))) = ((∫₂‘(𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0))) + (∫₂‘(𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0)))))
113	88, 112	eqtrd 2800	. . 3 ⊢ (𝜑 → (∫₂‘𝐺) = ((∫₂‘(𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0))) + (∫₂‘(𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0)))))
114	99, 111	readdcld 11255	. . 3 ⊢ (𝜑 → ((∫₂‘(𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ (𝐹‘𝐵)), (𝐹‘𝐵), 0))) + (∫₂‘(𝑥 ∈ ℝ ↦ if((𝑥 ∈ 𝐴 ∧ 0 ≤ -(𝐹‘𝐵)), -(𝐹‘𝐵), 0)))) ∈ ℝ)
115	113, 114	eqeltrd 2865	. 2 ⊢ (𝜑 → (∫₂‘𝐺) ∈ ℝ)
116	38, 115	jca 521	1 ⊢ (𝜑 → (𝐺 ∈ MblFn ∧ (∫₂‘𝐺) ∈ ℝ))

Colors of variables: wff setvar class

This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 401 ∧ w3a 1103 = wceq 1570 ∈ wcel 2146 Vcvv 3457 ∖ cdif 3903 ⊆ wss 3906 ifcif 4489 class class class wbr 5111 ↦ cmpt 5194 dom cdm 5663 ∘ ccom 5667 ⟶wf 6536 ‘cfv 6540 (class class class)co 7419 ∘_f cof 7682 ℂcc 11115 ℝcr 11116 0cc0 11117 + caddc 11120 +∞cpnf 11257 ≤ cle 11261 -cneg 11459 [,)cico 13392 abscabs 15311 –cn→ccncf 25088 volcvol 25675 MblFncmbf 25826 ∫₂citg2 25828 𝐿¹cibl 25829

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-rep 5240 ax-sep 5259 ax-nul 5271 ax-pow 5338 ax-pr 5406 ax-un 7742 ax-inf2 9617 ax-cc 10434 ax-cnex 11173 ax-resscn 11174 ax-1cn 11175 ax-icn 11176 ax-addcl 11177 ax-addrcl 11178 ax-mulcl 11179 ax-mulrcl 11180 ax-mulcom 11181 ax-addass 11182 ax-mulass 11183 ax-distr 11184 ax-i2m1 11185 ax-1ne0 11186 ax-1rid 11187 ax-rnegex 11188 ax-rrecex 11189 ax-cnre 11190 ax-pre-lttri 11191 ax-pre-lttrn 11192 ax-pre-ltadd 11193 ax-pre-mulgt0 11194 ax-pre-sup 11195 ax-addf 11196

This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3067 df-ral 3082 df-rex 3092 df-rmo 3371 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-tp 4596 df-op 4598 df-uni 4875 df-int 4915 df-iun 4960 df-iin 4961 df-disj 5079 df-br 5112 df-opab 5176 df-mpt 5195 df-tr 5221 df-id 5558 df-eprel 5563 df-po 5571 df-so 5572 df-fr 5616 df-se 5617 df-we 5618 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-pred 6306 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6496 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 7376 df-ov 7422 df-oprab 7423 df-mpo 7424 df-of 7684 df-ofr 7685 df-om 7869 df-1st 7992 df-2nd 7993 df-supp 8163 df-frecs 8284 df-wrecs 8315 df-recs 8364 df-rdg 8403 df-1o 8459 df-2o 8460 df-oadd 8463 df-omul 8464 df-er 8700 df-map 8832 df-pm 8833 df-ixp 8902 df-en 8950 df-dom 8951 df-sdom 8952 df-fin 8953 df-fsupp 9329 df-fi 9378 df-sup 9409 df-inf 9410 df-oi 9479 df-dju 9903 df-card 9941 df-acn 9944 df-pnf 11262 df-mnf 11263 df-xr 11264 df-ltxr 11265 df-le 11266 df-sub 11460 df-neg 11461 df-div 11889 df-nn 12251 df-2 12320 df-3 12321 df-4 12322 df-5 12323 df-6 12324 df-7 12325 df-8 12326 df-9 12327 df-n0 12522 df-z 12609 df-dec 12730 df-uz 12881 df-q 12991 df-rp 13035 df-xneg 13155 df-xadd 13156 df-xmul 13157 df-ioo 13394 df-ioc 13395 df-ico 13396 df-icc 13397 df-fz 13554 df-fzo 13702 df-fl 13845 df-seq 14058 df-exp 14118 df-hash 14387 df-cj 15176 df-re 15177 df-im 15178 df-sqrt 15312 df-abs 15313 df-clim 15565 df-rlim 15566 df-sum 15764 df-struct 17231 df-sets 17248 df-slot 17266 df-ndx 17278 df-base 17294 df-ress 17315 df-plusg 17347 df-mulr 17348 df-starv 17349 df-sca 17350 df-vsca 17351 df-ip 17352 df-tset 17353 df-ple 17354 df-ds 17356 df-unif 17357 df-hom 17358 df-cco 17359 df-rest 17499 df-topn 17500 df-0g 17518 df-gsum 17519 df-topgen 17520 df-pt 17521 df-prds 17524 df-xrs 17580 df-qtop 17585 df-imas 17586 df-xps 17588 df-mre 17662 df-mrc 17663 df-acs 17665 df-mgm 18722 df-sgrp 18811 df-mnd 18827 df-submnd 18881 df-mulg 19180 df-cntz 19433 df-cmn 19898 df-psmet 21566 df-xmet 21567 df-met 21568 df-bl 21569 df-mopn 21570 df-cnfld 21575 df-top 23103 df-topon 23120 df-topsp 23142 df-bases 23155 df-cn 23436 df-cnp 23437 df-cmp 23596 df-tx 23772 df-hmeo 23965 df-xms 24530 df-ms 24531 df-tms 24532 df-cncf 25090 df-ovol 25676 df-vol 25677 df-mbf 25831 df-itg1 25832 df-itg2 25833 df-ibl 25834 df-0p 25882

This theorem is used by: iblabs 26041

W3C validator