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Theorem iblss 24404
 Description: A subset of an integrable function is integrable. (Contributed by Mario Carneiro, 12-Aug-2014.)
Hypotheses
Ref Expression
iblss.1 (𝜑𝐴𝐵)
iblss.2 (𝜑𝐴 ∈ dom vol)
iblss.3 ((𝜑𝑥𝐵) → 𝐶𝑉)
iblss.4 (𝜑 → (𝑥𝐵𝐶) ∈ 𝐿1)
Assertion
Ref Expression
iblss (𝜑 → (𝑥𝐴𝐶) ∈ 𝐿1)
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝜑,𝑥   𝑥,𝑉
Allowed substitution hint:   𝐶(𝑥)

Proof of Theorem iblss
Dummy variable 𝑘 is distinct from all other variables.
StepHypRef Expression
1 iblss.1 . . . 4 (𝜑𝐴𝐵)
21resmptd 5895 . . 3 (𝜑 → ((𝑥𝐵𝐶) ↾ 𝐴) = (𝑥𝐴𝐶))
3 iblss.4 . . . . 5 (𝜑 → (𝑥𝐵𝐶) ∈ 𝐿1)
4 iblmbf 24367 . . . . 5 ((𝑥𝐵𝐶) ∈ 𝐿1 → (𝑥𝐵𝐶) ∈ MblFn)
53, 4syl 17 . . . 4 (𝜑 → (𝑥𝐵𝐶) ∈ MblFn)
6 iblss.2 . . . 4 (𝜑𝐴 ∈ dom vol)
7 mbfres 24244 . . . 4 (((𝑥𝐵𝐶) ∈ MblFn ∧ 𝐴 ∈ dom vol) → ((𝑥𝐵𝐶) ↾ 𝐴) ∈ MblFn)
85, 6, 7syl2anc 587 . . 3 (𝜑 → ((𝑥𝐵𝐶) ↾ 𝐴) ∈ MblFn)
92, 8eqeltrrd 2917 . 2 (𝜑 → (𝑥𝐴𝐶) ∈ MblFn)
10 ifan 4500 . . . . . 6 if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0) = if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0)
111sselda 3952 . . . . . . . . 9 ((𝜑𝑥𝐴) → 𝑥𝐵)
1211ad4ant14 751 . . . . . . . 8 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ 𝑥𝐴) → 𝑥𝐵)
13 iblss.3 . . . . . . . . . . . . . . 15 ((𝜑𝑥𝐵) → 𝐶𝑉)
145, 13mbfmptcl 24236 . . . . . . . . . . . . . 14 ((𝜑𝑥𝐵) → 𝐶 ∈ ℂ)
1514ad4ant14 751 . . . . . . . . . . . . 13 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ 𝑥𝐵) → 𝐶 ∈ ℂ)
16 ax-icn 10588 . . . . . . . . . . . . . 14 i ∈ ℂ
17 ine0 11067 . . . . . . . . . . . . . 14 i ≠ 0
18 elfzelz 12907 . . . . . . . . . . . . . . 15 (𝑘 ∈ (0...3) → 𝑘 ∈ ℤ)
1918ad3antlr 730 . . . . . . . . . . . . . 14 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ 𝑥𝐵) → 𝑘 ∈ ℤ)
20 expclz 13455 . . . . . . . . . . . . . 14 ((i ∈ ℂ ∧ i ≠ 0 ∧ 𝑘 ∈ ℤ) → (i↑𝑘) ∈ ℂ)
2116, 17, 19, 20mp3an12i 1462 . . . . . . . . . . . . 13 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ 𝑥𝐵) → (i↑𝑘) ∈ ℂ)
22 expne0i 13462 . . . . . . . . . . . . . 14 ((i ∈ ℂ ∧ i ≠ 0 ∧ 𝑘 ∈ ℤ) → (i↑𝑘) ≠ 0)
2316, 17, 19, 22mp3an12i 1462 . . . . . . . . . . . . 13 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ 𝑥𝐵) → (i↑𝑘) ≠ 0)
2415, 21, 23divcld 11408 . . . . . . . . . . . 12 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ 𝑥𝐵) → (𝐶 / (i↑𝑘)) ∈ ℂ)
2524recld 14549 . . . . . . . . . . 11 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ 𝑥𝐵) → (ℜ‘(𝐶 / (i↑𝑘))) ∈ ℝ)
26 0re 10635 . . . . . . . . . . 11 0 ∈ ℝ
27 ifcl 4493 . . . . . . . . . . 11 (((ℜ‘(𝐶 / (i↑𝑘))) ∈ ℝ ∧ 0 ∈ ℝ) → if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ∈ ℝ)
2825, 26, 27sylancl 589 . . . . . . . . . 10 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ 𝑥𝐵) → if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ∈ ℝ)
2928rexrd 10683 . . . . . . . . 9 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ 𝑥𝐵) → if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ∈ ℝ*)
30 max1 12571 . . . . . . . . . 10 ((0 ∈ ℝ ∧ (ℜ‘(𝐶 / (i↑𝑘))) ∈ ℝ) → 0 ≤ if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0))
3126, 25, 30sylancr 590 . . . . . . . . 9 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ 𝑥𝐵) → 0 ≤ if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0))
32 elxrge0 12840 . . . . . . . . 9 (if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ∈ (0[,]+∞) ↔ (if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ∈ ℝ* ∧ 0 ≤ if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0)))
3329, 31, 32sylanbrc 586 . . . . . . . 8 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ 𝑥𝐵) → if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ∈ (0[,]+∞))
3412, 33syldan 594 . . . . . . 7 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ 𝑥𝐴) → if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ∈ (0[,]+∞))
35 0e0iccpnf 12842 . . . . . . . 8 0 ∈ (0[,]+∞)
3635a1i 11 . . . . . . 7 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ ¬ 𝑥𝐴) → 0 ∈ (0[,]+∞))
3734, 36ifclda 4483 . . . . . 6 (((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) → if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0) ∈ (0[,]+∞))
3810, 37eqeltrid 2920 . . . . 5 (((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) → if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ∈ (0[,]+∞))
3938fmpttd 6867 . . . 4 ((𝜑𝑘 ∈ (0...3)) → (𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)):ℝ⟶(0[,]+∞))
40 eqidd 2825 . . . . . 6 (𝜑 → (𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)) = (𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)))
41 eqidd 2825 . . . . . 6 ((𝜑𝑥𝐵) → (ℜ‘(𝐶 / (i↑𝑘))) = (ℜ‘(𝐶 / (i↑𝑘))))
4240, 41, 3, 13iblitg 24368 . . . . 5 ((𝜑𝑘 ∈ ℤ) → (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ∈ ℝ)
4318, 42sylan2 595 . . . 4 ((𝜑𝑘 ∈ (0...3)) → (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ∈ ℝ)
44 ifan 4500 . . . . . . 7 if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0) = if(𝑥𝐵, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0)
4535a1i 11 . . . . . . . 8 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ ¬ 𝑥𝐵) → 0 ∈ (0[,]+∞))
4633, 45ifclda 4483 . . . . . . 7 (((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) → if(𝑥𝐵, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0) ∈ (0[,]+∞))
4744, 46eqeltrid 2920 . . . . . 6 (((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) → if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ∈ (0[,]+∞))
4847fmpttd 6867 . . . . 5 ((𝜑𝑘 ∈ (0...3)) → (𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)):ℝ⟶(0[,]+∞))
4928leidd 11198 . . . . . . . . . . 11 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ 𝑥𝐵) → if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ≤ if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0))
50 breq1 5055 . . . . . . . . . . . 12 (if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0) = if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0) → (if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ≤ if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ↔ if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0) ≤ if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0)))
51 breq1 5055 . . . . . . . . . . . 12 (0 = if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0) → (0 ≤ if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ↔ if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0) ≤ if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0)))
5250, 51ifboth 4487 . . . . . . . . . . 11 ((if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ≤ if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ∧ 0 ≤ if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0)) → if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0) ≤ if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0))
5349, 31, 52syl2anc 587 . . . . . . . . . 10 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ 𝑥𝐵) → if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0) ≤ if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0))
54 iftrue 4455 . . . . . . . . . . 11 (𝑥𝐵 → if(𝑥𝐵, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0) = if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0))
5554adantl 485 . . . . . . . . . 10 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ 𝑥𝐵) → if(𝑥𝐵, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0) = if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0))
5653, 55breqtrrd 5080 . . . . . . . . 9 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ 𝑥𝐵) → if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0) ≤ if(𝑥𝐵, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0))
57 0le0 11731 . . . . . . . . . . 11 0 ≤ 0
5857a1i 11 . . . . . . . . . 10 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ ¬ 𝑥𝐵) → 0 ≤ 0)
5912stoic1a 1774 . . . . . . . . . . 11 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ ¬ 𝑥𝐵) → ¬ 𝑥𝐴)
6059iffalsed 4460 . . . . . . . . . 10 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ ¬ 𝑥𝐵) → if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0) = 0)
61 iffalse 4458 . . . . . . . . . . 11 𝑥𝐵 → if(𝑥𝐵, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0) = 0)
6261adantl 485 . . . . . . . . . 10 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ ¬ 𝑥𝐵) → if(𝑥𝐵, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0) = 0)
6358, 60, 623brtr4d 5084 . . . . . . . . 9 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) ∧ ¬ 𝑥𝐵) → if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0) ≤ if(𝑥𝐵, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0))
6456, 63pm2.61dan 812 . . . . . . . 8 (((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) → if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0) ≤ if(𝑥𝐵, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0))
6564, 10, 443brtr4g 5086 . . . . . . 7 (((𝜑𝑘 ∈ (0...3)) ∧ 𝑥 ∈ ℝ) → if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ≤ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))
6665ralrimiva 3177 . . . . . 6 ((𝜑𝑘 ∈ (0...3)) → ∀𝑥 ∈ ℝ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ≤ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))
67 reex 10620 . . . . . . . 8 ℝ ∈ V
6867a1i 11 . . . . . . 7 ((𝜑𝑘 ∈ (0...3)) → ℝ ∈ V)
69 eqidd 2825 . . . . . . 7 ((𝜑𝑘 ∈ (0...3)) → (𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)) = (𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)))
70 eqidd 2825 . . . . . . 7 ((𝜑𝑘 ∈ (0...3)) → (𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)) = (𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)))
7168, 38, 47, 69, 70ofrfval2 7417 . . . . . 6 ((𝜑𝑘 ∈ (0...3)) → ((𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)) ∘r ≤ (𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)) ↔ ∀𝑥 ∈ ℝ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ≤ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)))
7266, 71mpbird 260 . . . . 5 ((𝜑𝑘 ∈ (0...3)) → (𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)) ∘r ≤ (𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)))
73 itg2le 24339 . . . . 5 (((𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)):ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)):ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)) ∘r ≤ (𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) → (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ≤ (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))))
7439, 48, 72, 73syl3anc 1368 . . . 4 ((𝜑𝑘 ∈ (0...3)) → (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ≤ (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))))
75 itg2lecl 24338 . . . 4 (((𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)):ℝ⟶(0[,]+∞) ∧ (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ∈ ℝ ∧ (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ≤ (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)))) → (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ∈ ℝ)
7639, 43, 74, 75syl3anc 1368 . . 3 ((𝜑𝑘 ∈ (0...3)) → (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ∈ ℝ)
7776ralrimiva 3177 . 2 (𝜑 → ∀𝑘 ∈ (0...3)(∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ∈ ℝ)
78 eqidd 2825 . . 3 (𝜑 → (𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)) = (𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)))
79 eqidd 2825 . . 3 ((𝜑𝑥𝐴) → (ℜ‘(𝐶 / (i↑𝑘))) = (ℜ‘(𝐶 / (i↑𝑘))))
8011, 14syldan 594 . . 3 ((𝜑𝑥𝐴) → 𝐶 ∈ ℂ)
8178, 79, 80isibl2 24366 . 2 (𝜑 → ((𝑥𝐴𝐶) ∈ 𝐿1 ↔ ((𝑥𝐴𝐶) ∈ MblFn ∧ ∀𝑘 ∈ (0...3)(∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ∈ ℝ)))
829, 77, 81mpbir2and 712 1 (𝜑 → (𝑥𝐴𝐶) ∈ 𝐿1)
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 399   = wceq 1538   ∈ wcel 2115   ≠ wne 3014  ∀wral 3133  Vcvv 3480   ⊆ wss 3919  ifcif 4449   class class class wbr 5052   ↦ cmpt 5132  dom cdm 5542   ↾ cres 5544  ⟶wf 6339  ‘cfv 6343  (class class class)co 7145   ∘r cofr 7398  ℂcc 10527  ℝcr 10528  0cc0 10529  ici 10531  +∞cpnf 10664  ℝ*cxr 10666   ≤ cle 10668   / cdiv 11289  3c3 11686  ℤcz 11974  [,]cicc 12734  ...cfz 12890  ↑cexp 13430  ℜcre 14452  volcvol 24063  MblFncmbf 24214  ∫2citg2 24216  𝐿1cibl 24217 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 1912  ax-6 1971  ax-7 2016  ax-8 2117  ax-9 2125  ax-10 2146  ax-11 2162  ax-12 2179  ax-ext 2796  ax-rep 5176  ax-sep 5189  ax-nul 5196  ax-pow 5253  ax-pr 5317  ax-un 7451  ax-inf2 9095  ax-cnex 10585  ax-resscn 10586  ax-1cn 10587  ax-icn 10588  ax-addcl 10589  ax-addrcl 10590  ax-mulcl 10591  ax-mulrcl 10592  ax-mulcom 10593  ax-addass 10594  ax-mulass 10595  ax-distr 10596  ax-i2m1 10597  ax-1ne0 10598  ax-1rid 10599  ax-rnegex 10600  ax-rrecex 10601  ax-cnre 10602  ax-pre-lttri 10603  ax-pre-lttrn 10604  ax-pre-ltadd 10605  ax-pre-mulgt0 10606  ax-pre-sup 10607 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2071  df-mo 2624  df-eu 2655  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2964  df-ne 3015  df-nel 3119  df-ral 3138  df-rex 3139  df-reu 3140  df-rmo 3141  df-rab 3142  df-v 3482  df-sbc 3759  df-csb 3867  df-dif 3922  df-un 3924  df-in 3926  df-ss 3936  df-pss 3938  df-nul 4276  df-if 4450  df-pw 4523  df-sn 4550  df-pr 4552  df-tp 4554  df-op 4556  df-uni 4825  df-int 4863  df-iun 4907  df-br 5053  df-opab 5115  df-mpt 5133  df-tr 5159  df-id 5447  df-eprel 5452  df-po 5461  df-so 5462  df-fr 5501  df-se 5502  df-we 5503  df-xp 5548  df-rel 5549  df-cnv 5550  df-co 5551  df-dm 5552  df-rn 5553  df-res 5554  df-ima 5555  df-pred 6135  df-ord 6181  df-on 6182  df-lim 6183  df-suc 6184  df-iota 6302  df-fun 6345  df-fn 6346  df-f 6347  df-f1 6348  df-fo 6349  df-f1o 6350  df-fv 6351  df-isom 6352  df-riota 7103  df-ov 7148  df-oprab 7149  df-mpo 7150  df-of 7399  df-ofr 7400  df-om 7571  df-1st 7679  df-2nd 7680  df-wrecs 7937  df-recs 7998  df-rdg 8036  df-1o 8092  df-2o 8093  df-oadd 8096  df-er 8279  df-map 8398  df-pm 8399  df-en 8500  df-dom 8501  df-sdom 8502  df-fin 8503  df-sup 8897  df-inf 8898  df-oi 8965  df-dju 9321  df-card 9359  df-pnf 10669  df-mnf 10670  df-xr 10671  df-ltxr 10672  df-le 10673  df-sub 10864  df-neg 10865  df-div 11290  df-nn 11631  df-2 11693  df-3 11694  df-4 11695  df-n0 11891  df-z 11975  df-uz 12237  df-q 12342  df-rp 12383  df-xadd 12501  df-ioo 12735  df-ico 12737  df-icc 12738  df-fz 12891  df-fzo 13034  df-fl 13162  df-mod 13238  df-seq 13370  df-exp 13431  df-hash 13692  df-cj 14454  df-re 14455  df-im 14456  df-sqrt 14590  df-abs 14591  df-clim 14841  df-sum 15039  df-xmet 20531  df-met 20532  df-ovol 24064  df-vol 24065  df-mbf 24219  df-itg1 24220  df-itg2 24221  df-ibl 24222 This theorem is referenced by:  itgss3  24414  itgless  24416  bddmulibl  24438  itgcn  24444  ditgcl  24457  ditgswap  24458  ditgsplitlem  24459  ftc1lem1  24634  ftc1lem2  24635  ftc1a  24636  ftc1lem4  24638  ftc2  24643  ftc2ditglem  24644  itgsubstlem  24647  itgpowd  24649  fdvposlt  31895  fdvposle  31897  circlemeth  31936  ftc1cnnclem  35038  ftc1anc  35048  ftc2nc  35049  areacirc  35060  lcmineqlem10  39232  lcmineqlem12  39234  lhe4.4ex1a  40890  itgsin0pilem1  42455  iblioosinexp  42458  itgsinexplem1  42459  itgsinexp  42460  itgcoscmulx  42474  itgsincmulx  42479  iblcncfioo  42483  dirkeritg  42607  fourierdlem87  42698  fourierdlem95  42706  fourierdlem103  42714  fourierdlem104  42715  fourierdlem107  42718  fourierdlem111  42722  fourierdlem112  42723  sqwvfoura  42733  sqwvfourb  42734  etransclem18  42757
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