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Theorem iblsplit 39486
 Description: The union of two integrable functions is integrable. (Contributed by Glauco Siliprandi, 11-Dec-2019.)
Hypotheses
Ref Expression
iblsplit.1 (𝜑 → (vol*‘(𝐴𝐵)) = 0)
iblsplit.2 (𝜑𝑈 = (𝐴𝐵))
iblsplit.3 ((𝜑𝑥𝑈) → 𝐶 ∈ ℂ)
iblsplit.4 (𝜑 → (𝑥𝐴𝐶) ∈ 𝐿1)
iblsplit.5 (𝜑 → (𝑥𝐵𝐶) ∈ 𝐿1)
Assertion
Ref Expression
iblsplit (𝜑 → (𝑥𝑈𝐶) ∈ 𝐿1)
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝑥,𝑈   𝜑,𝑥
Allowed substitution hint:   𝐶(𝑥)

Proof of Theorem iblsplit
Dummy variables 𝑘 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 iblsplit.3 . . . 4 ((𝜑𝑥𝑈) → 𝐶 ∈ ℂ)
2 eqid 2621 . . . 4 (𝑥𝑈𝐶) = (𝑥𝑈𝐶)
31, 2fmptd 6340 . . 3 (𝜑 → (𝑥𝑈𝐶):𝑈⟶ℂ)
4 ssun1 3754 . . . . . 6 𝐴 ⊆ (𝐴𝐵)
5 iblsplit.2 . . . . . 6 (𝜑𝑈 = (𝐴𝐵))
64, 5syl5sseqr 3633 . . . . 5 (𝜑𝐴𝑈)
76resmptd 5411 . . . 4 (𝜑 → ((𝑥𝑈𝐶) ↾ 𝐴) = (𝑥𝐴𝐶))
8 iblsplit.4 . . . . . 6 (𝜑 → (𝑥𝐴𝐶) ∈ 𝐿1)
9 eqidd 2622 . . . . . . 7 (𝜑 → (𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑦)))), (ℜ‘(𝐶 / (i↑𝑦))), 0)) = (𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑦)))), (ℜ‘(𝐶 / (i↑𝑦))), 0)))
10 eqidd 2622 . . . . . . 7 ((𝜑𝑥𝐴) → (ℜ‘(𝐶 / (i↑𝑦))) = (ℜ‘(𝐶 / (i↑𝑦))))
116sseld 3582 . . . . . . . . 9 (𝜑 → (𝑥𝐴𝑥𝑈))
1211imdistani 725 . . . . . . . 8 ((𝜑𝑥𝐴) → (𝜑𝑥𝑈))
1312, 1syl 17 . . . . . . 7 ((𝜑𝑥𝐴) → 𝐶 ∈ ℂ)
149, 10, 13isibl2 23439 . . . . . 6 (𝜑 → ((𝑥𝐴𝐶) ∈ 𝐿1 ↔ ((𝑥𝐴𝐶) ∈ MblFn ∧ ∀𝑦 ∈ (0...3)(∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑦)))), (ℜ‘(𝐶 / (i↑𝑦))), 0))) ∈ ℝ)))
158, 14mpbid 222 . . . . 5 (𝜑 → ((𝑥𝐴𝐶) ∈ MblFn ∧ ∀𝑦 ∈ (0...3)(∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑦)))), (ℜ‘(𝐶 / (i↑𝑦))), 0))) ∈ ℝ))
1615simpld 475 . . . 4 (𝜑 → (𝑥𝐴𝐶) ∈ MblFn)
177, 16eqeltrd 2698 . . 3 (𝜑 → ((𝑥𝑈𝐶) ↾ 𝐴) ∈ MblFn)
18 ssun2 3755 . . . . . 6 𝐵 ⊆ (𝐴𝐵)
1918, 5syl5sseqr 3633 . . . . 5 (𝜑𝐵𝑈)
2019resmptd 5411 . . . 4 (𝜑 → ((𝑥𝑈𝐶) ↾ 𝐵) = (𝑥𝐵𝐶))
21 iblsplit.5 . . . . . 6 (𝜑 → (𝑥𝐵𝐶) ∈ 𝐿1)
22 eqidd 2622 . . . . . . 7 (𝜑 → (𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑦)))), (ℜ‘(𝐶 / (i↑𝑦))), 0)) = (𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑦)))), (ℜ‘(𝐶 / (i↑𝑦))), 0)))
23 eqidd 2622 . . . . . . 7 ((𝜑𝑥𝐵) → (ℜ‘(𝐶 / (i↑𝑦))) = (ℜ‘(𝐶 / (i↑𝑦))))
2419sseld 3582 . . . . . . . . 9 (𝜑 → (𝑥𝐵𝑥𝑈))
2524imdistani 725 . . . . . . . 8 ((𝜑𝑥𝐵) → (𝜑𝑥𝑈))
2625, 1syl 17 . . . . . . 7 ((𝜑𝑥𝐵) → 𝐶 ∈ ℂ)
2722, 23, 26isibl2 23439 . . . . . 6 (𝜑 → ((𝑥𝐵𝐶) ∈ 𝐿1 ↔ ((𝑥𝐵𝐶) ∈ MblFn ∧ ∀𝑦 ∈ (0...3)(∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑦)))), (ℜ‘(𝐶 / (i↑𝑦))), 0))) ∈ ℝ)))
2821, 27mpbid 222 . . . . 5 (𝜑 → ((𝑥𝐵𝐶) ∈ MblFn ∧ ∀𝑦 ∈ (0...3)(∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑦)))), (ℜ‘(𝐶 / (i↑𝑦))), 0))) ∈ ℝ))
2928simpld 475 . . . 4 (𝜑 → (𝑥𝐵𝐶) ∈ MblFn)
3020, 29eqeltrd 2698 . . 3 (𝜑 → ((𝑥𝑈𝐶) ↾ 𝐵) ∈ MblFn)
315eqcomd 2627 . . 3 (𝜑 → (𝐴𝐵) = 𝑈)
323, 17, 30, 31mbfres2cn 39478 . 2 (𝜑 → (𝑥𝑈𝐶) ∈ MblFn)
3316, 13mbfdm2 23311 . . . . . 6 (𝜑𝐴 ∈ dom vol)
3433adantr 481 . . . . 5 ((𝜑𝑘 ∈ (0...3)) → 𝐴 ∈ dom vol)
3529, 26mbfdm2 23311 . . . . . 6 (𝜑𝐵 ∈ dom vol)
3635adantr 481 . . . . 5 ((𝜑𝑘 ∈ (0...3)) → 𝐵 ∈ dom vol)
37 iblsplit.1 . . . . . 6 (𝜑 → (vol*‘(𝐴𝐵)) = 0)
3837adantr 481 . . . . 5 ((𝜑𝑘 ∈ (0...3)) → (vol*‘(𝐴𝐵)) = 0)
395adantr 481 . . . . 5 ((𝜑𝑘 ∈ (0...3)) → 𝑈 = (𝐴𝐵))
401adantlr 750 . . . . . . . . . . 11 (((𝜑𝑘 ∈ (0...3)) ∧ 𝑥𝑈) → 𝐶 ∈ ℂ)
41 ax-icn 9939 . . . . . . . . . . . . . 14 i ∈ ℂ
4241a1i 11 . . . . . . . . . . . . 13 (𝑘 ∈ (0...3) → i ∈ ℂ)
43 elfznn0 12374 . . . . . . . . . . . . 13 (𝑘 ∈ (0...3) → 𝑘 ∈ ℕ0)
4442, 43expcld 12948 . . . . . . . . . . . 12 (𝑘 ∈ (0...3) → (i↑𝑘) ∈ ℂ)
4544ad2antlr 762 . . . . . . . . . . 11 (((𝜑𝑘 ∈ (0...3)) ∧ 𝑥𝑈) → (i↑𝑘) ∈ ℂ)
4641a1i 11 . . . . . . . . . . . 12 (((𝜑𝑘 ∈ (0...3)) ∧ 𝑥𝑈) → i ∈ ℂ)
47 ine0 10409 . . . . . . . . . . . . 13 i ≠ 0
4847a1i 11 . . . . . . . . . . . 12 (((𝜑𝑘 ∈ (0...3)) ∧ 𝑥𝑈) → i ≠ 0)
49 elfzelz 12284 . . . . . . . . . . . . 13 (𝑘 ∈ (0...3) → 𝑘 ∈ ℤ)
5049ad2antlr 762 . . . . . . . . . . . 12 (((𝜑𝑘 ∈ (0...3)) ∧ 𝑥𝑈) → 𝑘 ∈ ℤ)
5146, 48, 50expne0d 12954 . . . . . . . . . . 11 (((𝜑𝑘 ∈ (0...3)) ∧ 𝑥𝑈) → (i↑𝑘) ≠ 0)
5240, 45, 51divcld 10745 . . . . . . . . . 10 (((𝜑𝑘 ∈ (0...3)) ∧ 𝑥𝑈) → (𝐶 / (i↑𝑘)) ∈ ℂ)
5352recld 13868 . . . . . . . . 9 (((𝜑𝑘 ∈ (0...3)) ∧ 𝑥𝑈) → (ℜ‘(𝐶 / (i↑𝑘))) ∈ ℝ)
5453rexrd 10033 . . . . . . . 8 (((𝜑𝑘 ∈ (0...3)) ∧ 𝑥𝑈) → (ℜ‘(𝐶 / (i↑𝑘))) ∈ ℝ*)
5554adantr 481 . . . . . . 7 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥𝑈) ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))) → (ℜ‘(𝐶 / (i↑𝑘))) ∈ ℝ*)
56 simpr 477 . . . . . . 7 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥𝑈) ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))) → 0 ≤ (ℜ‘(𝐶 / (i↑𝑘))))
57 pnfge 11908 . . . . . . . 8 ((ℜ‘(𝐶 / (i↑𝑘))) ∈ ℝ* → (ℜ‘(𝐶 / (i↑𝑘))) ≤ +∞)
5855, 57syl 17 . . . . . . 7 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥𝑈) ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))) → (ℜ‘(𝐶 / (i↑𝑘))) ≤ +∞)
59 0xr 10030 . . . . . . . 8 0 ∈ ℝ*
60 pnfxr 10036 . . . . . . . 8 +∞ ∈ ℝ*
61 elicc1 12161 . . . . . . . 8 ((0 ∈ ℝ* ∧ +∞ ∈ ℝ*) → ((ℜ‘(𝐶 / (i↑𝑘))) ∈ (0[,]+∞) ↔ ((ℜ‘(𝐶 / (i↑𝑘))) ∈ ℝ* ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘))) ∧ (ℜ‘(𝐶 / (i↑𝑘))) ≤ +∞)))
6259, 60, 61mp2an 707 . . . . . . 7 ((ℜ‘(𝐶 / (i↑𝑘))) ∈ (0[,]+∞) ↔ ((ℜ‘(𝐶 / (i↑𝑘))) ∈ ℝ* ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘))) ∧ (ℜ‘(𝐶 / (i↑𝑘))) ≤ +∞))
6355, 56, 58, 62syl3anbrc 1244 . . . . . 6 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥𝑈) ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))) → (ℜ‘(𝐶 / (i↑𝑘))) ∈ (0[,]+∞))
64 0e0iccpnf 12225 . . . . . . 7 0 ∈ (0[,]+∞)
6564a1i 11 . . . . . 6 ((((𝜑𝑘 ∈ (0...3)) ∧ 𝑥𝑈) ∧ ¬ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))) → 0 ∈ (0[,]+∞))
6663, 65ifclda 4092 . . . . 5 (((𝜑𝑘 ∈ (0...3)) ∧ 𝑥𝑈) → if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0) ∈ (0[,]+∞))
67 eqid 2621 . . . . 5 (𝑥 ∈ ℝ ↦ if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0)) = (𝑥 ∈ ℝ ↦ if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0))
68 eqid 2621 . . . . 5 (𝑥 ∈ ℝ ↦ if(𝑥𝐵, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0)) = (𝑥 ∈ ℝ ↦ if(𝑥𝐵, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0))
69 ifan 4106 . . . . . 6 if((𝑥𝑈 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0) = if(𝑥𝑈, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0)
7069mpteq2i 4701 . . . . 5 (𝑥 ∈ ℝ ↦ if((𝑥𝑈 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)) = (𝑥 ∈ ℝ ↦ if(𝑥𝑈, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0))
71 ifan 4106 . . . . . . . . . 10 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)
7271eqcomi 2630 . . . . . . . . 9 if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0) = if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)
7372mpteq2i 4701 . . . . . . . 8 (𝑥 ∈ ℝ ↦ if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0)) = (𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))
7473a1i 11 . . . . . . 7 ((𝜑𝑘 ∈ (0...3)) → (𝑥 ∈ ℝ ↦ if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0)) = (𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)))
7574fveq2d 6152 . . . . . 6 ((𝜑𝑘 ∈ (0...3)) → (∫2‘(𝑥 ∈ ℝ ↦ if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0))) = (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))))
76 eqidd 2622 . . . . . . . . . 10 (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)))
77 eqidd 2622 . . . . . . . . . 10 ((𝜑𝑥𝐴) → (ℜ‘(𝐶 / (i↑𝑘))) = (ℜ‘(𝐶 / (i↑𝑘))))
7876, 77, 13isibl2 23439 . . . . . . . . 9 (𝜑 → ((𝑥𝐴𝐶) ∈ 𝐿1 ↔ ((𝑥𝐴𝐶) ∈ MblFn ∧ ∀𝑘 ∈ (0...3)(∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ∈ ℝ)))
798, 78mpbid 222 . . . . . . . 8 (𝜑 → ((𝑥𝐴𝐶) ∈ MblFn ∧ ∀𝑘 ∈ (0...3)(∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ∈ ℝ))
8079simprd 479 . . . . . . 7 (𝜑 → ∀𝑘 ∈ (0...3)(∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ∈ ℝ)
8180r19.21bi 2927 . . . . . 6 ((𝜑𝑘 ∈ (0...3)) → (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐴 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ∈ ℝ)
8275, 81eqeltrd 2698 . . . . 5 ((𝜑𝑘 ∈ (0...3)) → (∫2‘(𝑥 ∈ ℝ ↦ if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0))) ∈ ℝ)
83 ifan 4106 . . . . . . . . 9 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)
8483eqcomi 2630 . . . . . . . 8 if(𝑥𝐵, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0) = if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)
8584mpteq2i 4701 . . . . . . 7 (𝑥 ∈ ℝ ↦ if(𝑥𝐵, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0)) = (𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))
8685fveq2i 6151 . . . . . 6 (∫2‘(𝑥 ∈ ℝ ↦ if(𝑥𝐵, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0))) = (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)))
87 eqidd 2622 . . . . . . . . . 10 (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)))
88 eqidd 2622 . . . . . . . . . 10 ((𝜑𝑥𝐵) → (ℜ‘(𝐶 / (i↑𝑘))) = (ℜ‘(𝐶 / (i↑𝑘))))
8987, 88, 26isibl2 23439 . . . . . . . . 9 (𝜑 → ((𝑥𝐵𝐶) ∈ 𝐿1 ↔ ((𝑥𝐵𝐶) ∈ MblFn ∧ ∀𝑘 ∈ (0...3)(∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ∈ ℝ)))
9021, 89mpbid 222 . . . . . . . 8 (𝜑 → ((𝑥𝐵𝐶) ∈ MblFn ∧ ∀𝑘 ∈ (0...3)(∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ∈ ℝ))
9190simprd 479 . . . . . . 7 (𝜑 → ∀𝑘 ∈ (0...3)(∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ∈ ℝ)
9291r19.21bi 2927 . . . . . 6 ((𝜑𝑘 ∈ (0...3)) → (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝐵 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ∈ ℝ)
9386, 92syl5eqel 2702 . . . . 5 ((𝜑𝑘 ∈ (0...3)) → (∫2‘(𝑥 ∈ ℝ ↦ if(𝑥𝐵, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0))) ∈ ℝ)
9434, 36, 38, 39, 66, 67, 68, 70, 82, 93itg2split 23422 . . . 4 ((𝜑𝑘 ∈ (0...3)) → (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝑈 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) = ((∫2‘(𝑥 ∈ ℝ ↦ if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0))) + (∫2‘(𝑥 ∈ ℝ ↦ if(𝑥𝐵, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0)))))
9582, 93readdcld 10013 . . . 4 ((𝜑𝑘 ∈ (0...3)) → ((∫2‘(𝑥 ∈ ℝ ↦ if(𝑥𝐴, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0))) + (∫2‘(𝑥 ∈ ℝ ↦ if(𝑥𝐵, if(0 ≤ (ℜ‘(𝐶 / (i↑𝑘))), (ℜ‘(𝐶 / (i↑𝑘))), 0), 0)))) ∈ ℝ)
9694, 95eqeltrd 2698 . . 3 ((𝜑𝑘 ∈ (0...3)) → (∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝑈 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ∈ ℝ)
9796ralrimiva 2960 . 2 (𝜑 → ∀𝑘 ∈ (0...3)(∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝑈 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ∈ ℝ)
98 eqidd 2622 . . 3 (𝜑 → (𝑥 ∈ ℝ ↦ if((𝑥𝑈 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)) = (𝑥 ∈ ℝ ↦ if((𝑥𝑈 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0)))
99 eqidd 2622 . . 3 ((𝜑𝑥𝑈) → (ℜ‘(𝐶 / (i↑𝑘))) = (ℜ‘(𝐶 / (i↑𝑘))))
10098, 99, 1isibl2 23439 . 2 (𝜑 → ((𝑥𝑈𝐶) ∈ 𝐿1 ↔ ((𝑥𝑈𝐶) ∈ MblFn ∧ ∀𝑘 ∈ (0...3)(∫2‘(𝑥 ∈ ℝ ↦ if((𝑥𝑈 ∧ 0 ≤ (ℜ‘(𝐶 / (i↑𝑘)))), (ℜ‘(𝐶 / (i↑𝑘))), 0))) ∈ ℝ)))
10132, 97, 100mpbir2and 956 1 (𝜑 → (𝑥𝑈𝐶) ∈ 𝐿1)
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 196   ∧ wa 384   ∧ w3a 1036   = wceq 1480   ∈ wcel 1987   ≠ wne 2790  ∀wral 2907   ∪ cun 3553   ∩ cin 3554  ifcif 4058   class class class wbr 4613   ↦ cmpt 4673  dom cdm 5074   ↾ cres 5076  ‘cfv 5847  (class class class)co 6604  ℂcc 9878  ℝcr 9879  0cc0 9880  ici 9882   + caddc 9883  +∞cpnf 10015  ℝ*cxr 10017   ≤ cle 10019   / cdiv 10628  3c3 11015  ℤcz 11321  [,]cicc 12120  ...cfz 12268  ↑cexp 12800  ℜcre 13771  vol*covol 23138  volcvol 23139  MblFncmbf 23289  ∫2citg2 23291  𝐿1cibl 23292 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-rep 4731  ax-sep 4741  ax-nul 4749  ax-pow 4803  ax-pr 4867  ax-un 6902  ax-inf2 8482  ax-cnex 9936  ax-resscn 9937  ax-1cn 9938  ax-icn 9939  ax-addcl 9940  ax-addrcl 9941  ax-mulcl 9942  ax-mulrcl 9943  ax-mulcom 9944  ax-addass 9945  ax-mulass 9946  ax-distr 9947  ax-i2m1 9948  ax-1ne0 9949  ax-1rid 9950  ax-rnegex 9951  ax-rrecex 9952  ax-cnre 9953  ax-pre-lttri 9954  ax-pre-lttrn 9955  ax-pre-ltadd 9956  ax-pre-mulgt0 9957  ax-pre-sup 9958  ax-addf 9959 This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1483  df-fal 1486  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-nel 2894  df-ral 2912  df-rex 2913  df-reu 2914  df-rmo 2915  df-rab 2916  df-v 3188  df-sbc 3418  df-csb 3515  df-dif 3558  df-un 3560  df-in 3562  df-ss 3569  df-pss 3571  df-nul 3892  df-if 4059  df-pw 4132  df-sn 4149  df-pr 4151  df-tp 4153  df-op 4155  df-uni 4403  df-int 4441  df-iun 4487  df-disj 4584  df-br 4614  df-opab 4674  df-mpt 4675  df-tr 4713  df-eprel 4985  df-id 4989  df-po 4995  df-so 4996  df-fr 5033  df-se 5034  df-we 5035  df-xp 5080  df-rel 5081  df-cnv 5082  df-co 5083  df-dm 5084  df-rn 5085  df-res 5086  df-ima 5087  df-pred 5639  df-ord 5685  df-on 5686  df-lim 5687  df-suc 5688  df-iota 5810  df-fun 5849  df-fn 5850  df-f 5851  df-f1 5852  df-fo 5853  df-f1o 5854  df-fv 5855  df-isom 5856  df-riota 6565  df-ov 6607  df-oprab 6608  df-mpt2 6609  df-of 6850  df-ofr 6851  df-om 7013  df-1st 7113  df-2nd 7114  df-wrecs 7352  df-recs 7413  df-rdg 7451  df-1o 7505  df-2o 7506  df-oadd 7509  df-er 7687  df-map 7804  df-pm 7805  df-en 7900  df-dom 7901  df-sdom 7902  df-fin 7903  df-fi 8261  df-sup 8292  df-inf 8293  df-oi 8359  df-card 8709  df-cda 8934  df-pnf 10020  df-mnf 10021  df-xr 10022  df-ltxr 10023  df-le 10024  df-sub 10212  df-neg 10213  df-div 10629  df-nn 10965  df-2 11023  df-3 11024  df-n0 11237  df-z 11322  df-uz 11632  df-q 11733  df-rp 11777  df-xneg 11890  df-xadd 11891  df-xmul 11892  df-ioo 12121  df-ico 12123  df-icc 12124  df-fz 12269  df-fzo 12407  df-fl 12533  df-seq 12742  df-exp 12801  df-hash 13058  df-cj 13773  df-re 13774  df-im 13775  df-sqrt 13909  df-abs 13910  df-clim 14153  df-sum 14351  df-rest 16004  df-topgen 16025  df-psmet 19657  df-xmet 19658  df-met 19659  df-bl 19660  df-mopn 19661  df-top 20621  df-bases 20622  df-topon 20623  df-cmp 21100  df-ovol 23140  df-vol 23141  df-mbf 23294  df-itg1 23295  df-itg2 23296  df-ibl 23297 This theorem is referenced by:  iblsplitf  39490
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