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Theorem vonioolem2 39355
Description: The n-dimensional Lebesgue measure of open intervals. This is the first statement in Proposition 115G (d) of [Fremlin1] p. 32. (Contributed by Glauco Siliprandi, 8-Apr-2021.)
Hypotheses
Ref Expression
vonioolem2.x (𝜑𝑋 ∈ Fin)
vonioolem2.a (𝜑𝐴:𝑋⟶ℝ)
vonioolem2.b (𝜑𝐵:𝑋⟶ℝ)
vonioolem2.n (𝜑𝑋 ≠ ∅)
vonioolem2.t ((𝜑𝑘𝑋) → (𝐴𝑘) < (𝐵𝑘))
vonioolem2.i 𝐼 = X𝑘𝑋 ((𝐴𝑘)(,)(𝐵𝑘))
vonioolem2.c 𝐶 = (𝑛 ∈ ℕ ↦ (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / 𝑛))))
vonioolem2.d 𝐷 = (𝑛 ∈ ℕ ↦ X𝑘𝑋 (((𝐶𝑛)‘𝑘)[,)(𝐵𝑘)))
Assertion
Ref Expression
vonioolem2 (𝜑 → ((voln‘𝑋)‘𝐼) = ∏𝑘𝑋 ((𝐵𝑘) − (𝐴𝑘)))
Distinct variable groups:   𝐴,𝑘,𝑛   𝐵,𝑘,𝑛   𝐶,𝑘,𝑛   𝐷,𝑛   𝑛,𝐼   𝑘,𝑋,𝑛   𝜑,𝑘,𝑛
Allowed substitution hints:   𝐷(𝑘)   𝐼(𝑘)

Proof of Theorem vonioolem2
Dummy variables 𝑗 𝑚 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 vonioolem2.x . . . . 5 (𝜑𝑋 ∈ Fin)
21vonmea 39247 . . . 4 (𝜑 → (voln‘𝑋) ∈ Meas)
3 1zzd 11243 . . . 4 (𝜑 → 1 ∈ ℤ)
4 nnuz 11557 . . . 4 ℕ = (ℤ‘1)
51adantr 479 . . . . . 6 ((𝜑𝑛 ∈ ℕ) → 𝑋 ∈ Fin)
6 eqid 2609 . . . . . 6 dom (voln‘𝑋) = dom (voln‘𝑋)
7 vonioolem2.a . . . . . . . . . . 11 (𝜑𝐴:𝑋⟶ℝ)
87adantr 479 . . . . . . . . . 10 ((𝜑𝑛 ∈ ℕ) → 𝐴:𝑋⟶ℝ)
98ffvelrnda 6251 . . . . . . . . 9 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → (𝐴𝑘) ∈ ℝ)
10 nnrecre 10906 . . . . . . . . . 10 (𝑛 ∈ ℕ → (1 / 𝑛) ∈ ℝ)
1110ad2antlr 758 . . . . . . . . 9 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → (1 / 𝑛) ∈ ℝ)
129, 11readdcld 9925 . . . . . . . 8 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → ((𝐴𝑘) + (1 / 𝑛)) ∈ ℝ)
13 eqid 2609 . . . . . . . 8 (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / 𝑛))) = (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / 𝑛)))
1412, 13fmptd 6276 . . . . . . 7 ((𝜑𝑛 ∈ ℕ) → (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / 𝑛))):𝑋⟶ℝ)
15 vonioolem2.c . . . . . . . . . 10 𝐶 = (𝑛 ∈ ℕ ↦ (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / 𝑛))))
1615a1i 11 . . . . . . . . 9 (𝜑𝐶 = (𝑛 ∈ ℕ ↦ (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / 𝑛)))))
171mptexd 6368 . . . . . . . . . 10 (𝜑 → (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / 𝑛))) ∈ V)
1817adantr 479 . . . . . . . . 9 ((𝜑𝑛 ∈ ℕ) → (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / 𝑛))) ∈ V)
1916, 18fvmpt2d 6186 . . . . . . . 8 ((𝜑𝑛 ∈ ℕ) → (𝐶𝑛) = (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / 𝑛))))
2019feq1d 5928 . . . . . . 7 ((𝜑𝑛 ∈ ℕ) → ((𝐶𝑛):𝑋⟶ℝ ↔ (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / 𝑛))):𝑋⟶ℝ))
2114, 20mpbird 245 . . . . . 6 ((𝜑𝑛 ∈ ℕ) → (𝐶𝑛):𝑋⟶ℝ)
22 vonioolem2.b . . . . . . 7 (𝜑𝐵:𝑋⟶ℝ)
2322adantr 479 . . . . . 6 ((𝜑𝑛 ∈ ℕ) → 𝐵:𝑋⟶ℝ)
245, 6, 21, 23hoimbl 39304 . . . . 5 ((𝜑𝑛 ∈ ℕ) → X𝑘𝑋 (((𝐶𝑛)‘𝑘)[,)(𝐵𝑘)) ∈ dom (voln‘𝑋))
25 vonioolem2.d . . . . 5 𝐷 = (𝑛 ∈ ℕ ↦ X𝑘𝑋 (((𝐶𝑛)‘𝑘)[,)(𝐵𝑘)))
2624, 25fmptd 6276 . . . 4 (𝜑𝐷:ℕ⟶dom (voln‘𝑋))
27 nfv 1829 . . . . . 6 𝑘(𝜑𝑛 ∈ ℕ)
28 oveq2 6534 . . . . . . . . . . . . . . . 16 (𝑛 = 𝑚 → (1 / 𝑛) = (1 / 𝑚))
2928oveq2d 6542 . . . . . . . . . . . . . . 15 (𝑛 = 𝑚 → ((𝐴𝑘) + (1 / 𝑛)) = ((𝐴𝑘) + (1 / 𝑚)))
3029mpteq2dv 4667 . . . . . . . . . . . . . 14 (𝑛 = 𝑚 → (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / 𝑛))) = (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / 𝑚))))
3130cbvmptv 4672 . . . . . . . . . . . . 13 (𝑛 ∈ ℕ ↦ (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / 𝑛)))) = (𝑚 ∈ ℕ ↦ (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / 𝑚))))
3215, 31eqtri 2631 . . . . . . . . . . . 12 𝐶 = (𝑚 ∈ ℕ ↦ (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / 𝑚))))
3332a1i 11 . . . . . . . . . . 11 ((𝜑𝑛 ∈ ℕ) → 𝐶 = (𝑚 ∈ ℕ ↦ (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / 𝑚)))))
34 oveq2 6534 . . . . . . . . . . . . . 14 (𝑚 = (𝑛 + 1) → (1 / 𝑚) = (1 / (𝑛 + 1)))
3534oveq2d 6542 . . . . . . . . . . . . 13 (𝑚 = (𝑛 + 1) → ((𝐴𝑘) + (1 / 𝑚)) = ((𝐴𝑘) + (1 / (𝑛 + 1))))
3635mpteq2dv 4667 . . . . . . . . . . . 12 (𝑚 = (𝑛 + 1) → (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / 𝑚))) = (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / (𝑛 + 1)))))
3736adantl 480 . . . . . . . . . . 11 (((𝜑𝑛 ∈ ℕ) ∧ 𝑚 = (𝑛 + 1)) → (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / 𝑚))) = (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / (𝑛 + 1)))))
38 simpr 475 . . . . . . . . . . . 12 ((𝜑𝑛 ∈ ℕ) → 𝑛 ∈ ℕ)
3938peano2nnd 10886 . . . . . . . . . . 11 ((𝜑𝑛 ∈ ℕ) → (𝑛 + 1) ∈ ℕ)
405mptexd 6368 . . . . . . . . . . 11 ((𝜑𝑛 ∈ ℕ) → (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / (𝑛 + 1)))) ∈ V)
4133, 37, 39, 40fvmptd 6181 . . . . . . . . . 10 ((𝜑𝑛 ∈ ℕ) → (𝐶‘(𝑛 + 1)) = (𝑘𝑋 ↦ ((𝐴𝑘) + (1 / (𝑛 + 1)))))
42 ovex 6554 . . . . . . . . . . 11 ((𝐴𝑘) + (1 / (𝑛 + 1))) ∈ V
4342a1i 11 . . . . . . . . . 10 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → ((𝐴𝑘) + (1 / (𝑛 + 1))) ∈ V)
4441, 43fvmpt2d 6186 . . . . . . . . 9 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → ((𝐶‘(𝑛 + 1))‘𝑘) = ((𝐴𝑘) + (1 / (𝑛 + 1))))
45 1red 9911 . . . . . . . . . . . 12 (𝑛 ∈ ℕ → 1 ∈ ℝ)
46 nnre 10876 . . . . . . . . . . . . 13 (𝑛 ∈ ℕ → 𝑛 ∈ ℝ)
4746, 45readdcld 9925 . . . . . . . . . . . 12 (𝑛 ∈ ℕ → (𝑛 + 1) ∈ ℝ)
48 peano2nn 10881 . . . . . . . . . . . . 13 (𝑛 ∈ ℕ → (𝑛 + 1) ∈ ℕ)
49 nnne0 10902 . . . . . . . . . . . . 13 ((𝑛 + 1) ∈ ℕ → (𝑛 + 1) ≠ 0)
5048, 49syl 17 . . . . . . . . . . . 12 (𝑛 ∈ ℕ → (𝑛 + 1) ≠ 0)
5145, 47, 50redivcld 10704 . . . . . . . . . . 11 (𝑛 ∈ ℕ → (1 / (𝑛 + 1)) ∈ ℝ)
5251ad2antlr 758 . . . . . . . . . 10 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → (1 / (𝑛 + 1)) ∈ ℝ)
539, 52readdcld 9925 . . . . . . . . 9 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → ((𝐴𝑘) + (1 / (𝑛 + 1))) ∈ ℝ)
5444, 53eqeltrd 2687 . . . . . . . 8 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → ((𝐶‘(𝑛 + 1))‘𝑘) ∈ ℝ)
5554rexrd 9945 . . . . . . 7 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → ((𝐶‘(𝑛 + 1))‘𝑘) ∈ ℝ*)
56 ressxr 9939 . . . . . . . . 9 ℝ ⊆ ℝ*
5722ffvelrnda 6251 . . . . . . . . 9 ((𝜑𝑘𝑋) → (𝐵𝑘) ∈ ℝ)
5856, 57sseldi 3565 . . . . . . . 8 ((𝜑𝑘𝑋) → (𝐵𝑘) ∈ ℝ*)
5958adantlr 746 . . . . . . 7 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → (𝐵𝑘) ∈ ℝ*)
6046ltp1d 10805 . . . . . . . . . . . 12 (𝑛 ∈ ℕ → 𝑛 < (𝑛 + 1))
61 nnrp 11676 . . . . . . . . . . . . 13 (𝑛 ∈ ℕ → 𝑛 ∈ ℝ+)
6248nnrpd 11704 . . . . . . . . . . . . 13 (𝑛 ∈ ℕ → (𝑛 + 1) ∈ ℝ+)
6361, 62ltrecd 11724 . . . . . . . . . . . 12 (𝑛 ∈ ℕ → (𝑛 < (𝑛 + 1) ↔ (1 / (𝑛 + 1)) < (1 / 𝑛)))
6460, 63mpbid 220 . . . . . . . . . . 11 (𝑛 ∈ ℕ → (1 / (𝑛 + 1)) < (1 / 𝑛))
6551, 10, 64ltled 10036 . . . . . . . . . 10 (𝑛 ∈ ℕ → (1 / (𝑛 + 1)) ≤ (1 / 𝑛))
6665ad2antlr 758 . . . . . . . . 9 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → (1 / (𝑛 + 1)) ≤ (1 / 𝑛))
6752, 11, 9, 66leadd2dd 10493 . . . . . . . 8 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → ((𝐴𝑘) + (1 / (𝑛 + 1))) ≤ ((𝐴𝑘) + (1 / 𝑛)))
6812elexd 3186 . . . . . . . . . 10 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → ((𝐴𝑘) + (1 / 𝑛)) ∈ V)
6919, 68fvmpt2d 6186 . . . . . . . . 9 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → ((𝐶𝑛)‘𝑘) = ((𝐴𝑘) + (1 / 𝑛)))
7044, 69breq12d 4590 . . . . . . . 8 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → (((𝐶‘(𝑛 + 1))‘𝑘) ≤ ((𝐶𝑛)‘𝑘) ↔ ((𝐴𝑘) + (1 / (𝑛 + 1))) ≤ ((𝐴𝑘) + (1 / 𝑛))))
7167, 70mpbird 245 . . . . . . 7 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → ((𝐶‘(𝑛 + 1))‘𝑘) ≤ ((𝐶𝑛)‘𝑘))
7257adantlr 746 . . . . . . . 8 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → (𝐵𝑘) ∈ ℝ)
73 eqidd 2610 . . . . . . . 8 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → (𝐵𝑘) = (𝐵𝑘))
7472, 73eqled 9991 . . . . . . 7 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → (𝐵𝑘) ≤ (𝐵𝑘))
75 icossico 12072 . . . . . . 7 (((((𝐶‘(𝑛 + 1))‘𝑘) ∈ ℝ* ∧ (𝐵𝑘) ∈ ℝ*) ∧ (((𝐶‘(𝑛 + 1))‘𝑘) ≤ ((𝐶𝑛)‘𝑘) ∧ (𝐵𝑘) ≤ (𝐵𝑘))) → (((𝐶𝑛)‘𝑘)[,)(𝐵𝑘)) ⊆ (((𝐶‘(𝑛 + 1))‘𝑘)[,)(𝐵𝑘)))
7655, 59, 71, 74, 75syl22anc 1318 . . . . . 6 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → (((𝐶𝑛)‘𝑘)[,)(𝐵𝑘)) ⊆ (((𝐶‘(𝑛 + 1))‘𝑘)[,)(𝐵𝑘)))
7727, 76ixpssixp 38080 . . . . 5 ((𝜑𝑛 ∈ ℕ) → X𝑘𝑋 (((𝐶𝑛)‘𝑘)[,)(𝐵𝑘)) ⊆ X𝑘𝑋 (((𝐶‘(𝑛 + 1))‘𝑘)[,)(𝐵𝑘)))
7825a1i 11 . . . . . . 7 (𝜑𝐷 = (𝑛 ∈ ℕ ↦ X𝑘𝑋 (((𝐶𝑛)‘𝑘)[,)(𝐵𝑘))))
7924elexd 3186 . . . . . . 7 ((𝜑𝑛 ∈ ℕ) → X𝑘𝑋 (((𝐶𝑛)‘𝑘)[,)(𝐵𝑘)) ∈ V)
8078, 79fvmpt2d 6186 . . . . . 6 ((𝜑𝑛 ∈ ℕ) → (𝐷𝑛) = X𝑘𝑋 (((𝐶𝑛)‘𝑘)[,)(𝐵𝑘)))
81 fveq2 6087 . . . . . . . . . . . . 13 (𝑛 = 𝑚 → (𝐶𝑛) = (𝐶𝑚))
8281fveq1d 6089 . . . . . . . . . . . 12 (𝑛 = 𝑚 → ((𝐶𝑛)‘𝑘) = ((𝐶𝑚)‘𝑘))
8382oveq1d 6541 . . . . . . . . . . 11 (𝑛 = 𝑚 → (((𝐶𝑛)‘𝑘)[,)(𝐵𝑘)) = (((𝐶𝑚)‘𝑘)[,)(𝐵𝑘)))
8483ixpeq2dv 7787 . . . . . . . . . 10 (𝑛 = 𝑚X𝑘𝑋 (((𝐶𝑛)‘𝑘)[,)(𝐵𝑘)) = X𝑘𝑋 (((𝐶𝑚)‘𝑘)[,)(𝐵𝑘)))
8584cbvmptv 4672 . . . . . . . . 9 (𝑛 ∈ ℕ ↦ X𝑘𝑋 (((𝐶𝑛)‘𝑘)[,)(𝐵𝑘))) = (𝑚 ∈ ℕ ↦ X𝑘𝑋 (((𝐶𝑚)‘𝑘)[,)(𝐵𝑘)))
8625, 85eqtri 2631 . . . . . . . 8 𝐷 = (𝑚 ∈ ℕ ↦ X𝑘𝑋 (((𝐶𝑚)‘𝑘)[,)(𝐵𝑘)))
8786a1i 11 . . . . . . 7 ((𝜑𝑛 ∈ ℕ) → 𝐷 = (𝑚 ∈ ℕ ↦ X𝑘𝑋 (((𝐶𝑚)‘𝑘)[,)(𝐵𝑘))))
88 fveq2 6087 . . . . . . . . . . 11 (𝑚 = (𝑛 + 1) → (𝐶𝑚) = (𝐶‘(𝑛 + 1)))
8988fveq1d 6089 . . . . . . . . . 10 (𝑚 = (𝑛 + 1) → ((𝐶𝑚)‘𝑘) = ((𝐶‘(𝑛 + 1))‘𝑘))
9089oveq1d 6541 . . . . . . . . 9 (𝑚 = (𝑛 + 1) → (((𝐶𝑚)‘𝑘)[,)(𝐵𝑘)) = (((𝐶‘(𝑛 + 1))‘𝑘)[,)(𝐵𝑘)))
9190ixpeq2dv 7787 . . . . . . . 8 (𝑚 = (𝑛 + 1) → X𝑘𝑋 (((𝐶𝑚)‘𝑘)[,)(𝐵𝑘)) = X𝑘𝑋 (((𝐶‘(𝑛 + 1))‘𝑘)[,)(𝐵𝑘)))
9291adantl 480 . . . . . . 7 (((𝜑𝑛 ∈ ℕ) ∧ 𝑚 = (𝑛 + 1)) → X𝑘𝑋 (((𝐶𝑚)‘𝑘)[,)(𝐵𝑘)) = X𝑘𝑋 (((𝐶‘(𝑛 + 1))‘𝑘)[,)(𝐵𝑘)))
93 ovex 6554 . . . . . . . . . 10 (((𝐶‘(𝑛 + 1))‘𝑘)[,)(𝐵𝑘)) ∈ V
9493rgenw 2907 . . . . . . . . 9 𝑘𝑋 (((𝐶‘(𝑛 + 1))‘𝑘)[,)(𝐵𝑘)) ∈ V
95 ixpexg 7795 . . . . . . . . 9 (∀𝑘𝑋 (((𝐶‘(𝑛 + 1))‘𝑘)[,)(𝐵𝑘)) ∈ V → X𝑘𝑋 (((𝐶‘(𝑛 + 1))‘𝑘)[,)(𝐵𝑘)) ∈ V)
9694, 95ax-mp 5 . . . . . . . 8 X𝑘𝑋 (((𝐶‘(𝑛 + 1))‘𝑘)[,)(𝐵𝑘)) ∈ V
9796a1i 11 . . . . . . 7 ((𝜑𝑛 ∈ ℕ) → X𝑘𝑋 (((𝐶‘(𝑛 + 1))‘𝑘)[,)(𝐵𝑘)) ∈ V)
9887, 92, 39, 97fvmptd 6181 . . . . . 6 ((𝜑𝑛 ∈ ℕ) → (𝐷‘(𝑛 + 1)) = X𝑘𝑋 (((𝐶‘(𝑛 + 1))‘𝑘)[,)(𝐵𝑘)))
9980, 98sseq12d 3596 . . . . 5 ((𝜑𝑛 ∈ ℕ) → ((𝐷𝑛) ⊆ (𝐷‘(𝑛 + 1)) ↔ X𝑘𝑋 (((𝐶𝑛)‘𝑘)[,)(𝐵𝑘)) ⊆ X𝑘𝑋 (((𝐶‘(𝑛 + 1))‘𝑘)[,)(𝐵𝑘))))
10077, 99mpbird 245 . . . 4 ((𝜑𝑛 ∈ ℕ) → (𝐷𝑛) ⊆ (𝐷‘(𝑛 + 1)))
1011, 6, 7, 22hoimbl 39304 . . . . 5 (𝜑X𝑘𝑋 ((𝐴𝑘)[,)(𝐵𝑘)) ∈ dom (voln‘𝑋))
102 nfv 1829 . . . . . 6 𝑘𝜑
1037ffvelrnda 6251 . . . . . 6 ((𝜑𝑘𝑋) → (𝐴𝑘) ∈ ℝ)
104102, 1, 103, 57vonhoire 39346 . . . . 5 (𝜑 → ((voln‘𝑋)‘X𝑘𝑋 ((𝐴𝑘)[,)(𝐵𝑘))) ∈ ℝ)
105 vonioolem2.i . . . . . . 7 𝐼 = X𝑘𝑋 ((𝐴𝑘)(,)(𝐵𝑘))
106105a1i 11 . . . . . 6 (𝜑𝐼 = X𝑘𝑋 ((𝐴𝑘)(,)(𝐵𝑘)))
107 nftru 1720 . . . . . . . . 9 𝑘
108 ioossico 12091 . . . . . . . . . 10 ((𝐴𝑘)(,)(𝐵𝑘)) ⊆ ((𝐴𝑘)[,)(𝐵𝑘))
109108a1i 11 . . . . . . . . 9 ((⊤ ∧ 𝑘𝑋) → ((𝐴𝑘)(,)(𝐵𝑘)) ⊆ ((𝐴𝑘)[,)(𝐵𝑘)))
110107, 109ixpssixp 38080 . . . . . . . 8 (⊤ → X𝑘𝑋 ((𝐴𝑘)(,)(𝐵𝑘)) ⊆ X𝑘𝑋 ((𝐴𝑘)[,)(𝐵𝑘)))
111110trud 1483 . . . . . . 7 X𝑘𝑋 ((𝐴𝑘)(,)(𝐵𝑘)) ⊆ X𝑘𝑋 ((𝐴𝑘)[,)(𝐵𝑘))
112111a1i 11 . . . . . 6 (𝜑X𝑘𝑋 ((𝐴𝑘)(,)(𝐵𝑘)) ⊆ X𝑘𝑋 ((𝐴𝑘)[,)(𝐵𝑘)))
113106, 112eqsstrd 3601 . . . . 5 (𝜑𝐼X𝑘𝑋 ((𝐴𝑘)[,)(𝐵𝑘)))
11456a1i 11 . . . . . . . 8 (𝜑 → ℝ ⊆ ℝ*)
1157, 114fssd 5955 . . . . . . 7 (𝜑𝐴:𝑋⟶ℝ*)
11622, 114fssd 5955 . . . . . . 7 (𝜑𝐵:𝑋⟶ℝ*)
1171, 6, 115, 116ioovonmbl 39351 . . . . . 6 (𝜑X𝑘𝑋 ((𝐴𝑘)(,)(𝐵𝑘)) ∈ dom (voln‘𝑋))
118105, 117syl5eqel 2691 . . . . 5 (𝜑𝐼 ∈ dom (voln‘𝑋))
1192, 101, 104, 113, 118meassre 39153 . . . 4 (𝜑 → ((voln‘𝑋)‘𝐼) ∈ ℝ)
1202adantr 479 . . . . 5 ((𝜑𝑛 ∈ ℕ) → (voln‘𝑋) ∈ Meas)
12180, 24eqeltrd 2687 . . . . 5 ((𝜑𝑛 ∈ ℕ) → (𝐷𝑛) ∈ dom (voln‘𝑋))
122118adantr 479 . . . . 5 ((𝜑𝑛 ∈ ℕ) → 𝐼 ∈ dom (voln‘𝑋))
12356, 103sseldi 3565 . . . . . . . . 9 ((𝜑𝑘𝑋) → (𝐴𝑘) ∈ ℝ*)
124123adantlr 746 . . . . . . . 8 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → (𝐴𝑘) ∈ ℝ*)
12561rpreccld 11716 . . . . . . . . . 10 (𝑛 ∈ ℕ → (1 / 𝑛) ∈ ℝ+)
126125ad2antlr 758 . . . . . . . . 9 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → (1 / 𝑛) ∈ ℝ+)
1279, 126ltaddrpd 11739 . . . . . . . 8 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → (𝐴𝑘) < ((𝐴𝑘) + (1 / 𝑛)))
128 icossioo 12093 . . . . . . . 8 ((((𝐴𝑘) ∈ ℝ* ∧ (𝐵𝑘) ∈ ℝ*) ∧ ((𝐴𝑘) < ((𝐴𝑘) + (1 / 𝑛)) ∧ (𝐵𝑘) ≤ (𝐵𝑘))) → (((𝐴𝑘) + (1 / 𝑛))[,)(𝐵𝑘)) ⊆ ((𝐴𝑘)(,)(𝐵𝑘)))
129124, 59, 127, 74, 128syl22anc 1318 . . . . . . 7 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → (((𝐴𝑘) + (1 / 𝑛))[,)(𝐵𝑘)) ⊆ ((𝐴𝑘)(,)(𝐵𝑘)))
13027, 129ixpssixp 38080 . . . . . 6 ((𝜑𝑛 ∈ ℕ) → X𝑘𝑋 (((𝐴𝑘) + (1 / 𝑛))[,)(𝐵𝑘)) ⊆ X𝑘𝑋 ((𝐴𝑘)(,)(𝐵𝑘)))
13169oveq1d 6541 . . . . . . . . 9 (((𝜑𝑛 ∈ ℕ) ∧ 𝑘𝑋) → (((𝐶𝑛)‘𝑘)[,)(𝐵𝑘)) = (((𝐴𝑘) + (1 / 𝑛))[,)(𝐵𝑘)))
132131ixpeq2dva 7786 . . . . . . . 8 ((𝜑𝑛 ∈ ℕ) → X𝑘𝑋 (((𝐶𝑛)‘𝑘)[,)(𝐵𝑘)) = X𝑘𝑋 (((𝐴𝑘) + (1 / 𝑛))[,)(𝐵𝑘)))
13380, 132eqtrd 2643 . . . . . . 7 ((𝜑𝑛 ∈ ℕ) → (𝐷𝑛) = X𝑘𝑋 (((𝐴𝑘) + (1 / 𝑛))[,)(𝐵𝑘)))
134105a1i 11 . . . . . . 7 ((𝜑𝑛 ∈ ℕ) → 𝐼 = X𝑘𝑋 ((𝐴𝑘)(,)(𝐵𝑘)))
135133, 134sseq12d 3596 . . . . . 6 ((𝜑𝑛 ∈ ℕ) → ((𝐷𝑛) ⊆ 𝐼X𝑘𝑋 (((𝐴𝑘) + (1 / 𝑛))[,)(𝐵𝑘)) ⊆ X𝑘𝑋 ((𝐴𝑘)(,)(𝐵𝑘))))
136130, 135mpbird 245 . . . . 5 ((𝜑𝑛 ∈ ℕ) → (𝐷𝑛) ⊆ 𝐼)
137120, 6, 121, 122, 136meassle 39139 . . . 4 ((𝜑𝑛 ∈ ℕ) → ((voln‘𝑋)‘(𝐷𝑛)) ≤ ((voln‘𝑋)‘𝐼))
138 eqid 2609 . . . 4 (𝑛 ∈ ℕ ↦ ((voln‘𝑋)‘(𝐷𝑛))) = (𝑛 ∈ ℕ ↦ ((voln‘𝑋)‘(𝐷𝑛)))
1392, 3, 4, 26, 100, 119, 137, 138meaiuninc2 39158 . . 3 (𝜑 → (𝑛 ∈ ℕ ↦ ((voln‘𝑋)‘(𝐷𝑛))) ⇝ ((voln‘𝑋)‘ 𝑛 ∈ ℕ (𝐷𝑛)))
140102, 1, 103, 58iunhoiioo 39350 . . . . . . 7 (𝜑 𝑛 ∈ ℕ X𝑘𝑋 (((𝐴𝑘) + (1 / 𝑛))[,)(𝐵𝑘)) = X𝑘𝑋 ((𝐴𝑘)(,)(𝐵𝑘)))
141133iuneq2dv 4472 . . . . . . 7 (𝜑 𝑛 ∈ ℕ (𝐷𝑛) = 𝑛 ∈ ℕ X𝑘𝑋 (((𝐴𝑘) + (1 / 𝑛))[,)(𝐵𝑘)))
142140, 141, 1063eqtr4d 2653 . . . . . 6 (𝜑 𝑛 ∈ ℕ (𝐷𝑛) = 𝐼)
143142eqcomd 2615 . . . . 5 (𝜑𝐼 = 𝑛 ∈ ℕ (𝐷𝑛))
144143fveq2d 6091 . . . 4 (𝜑 → ((voln‘𝑋)‘𝐼) = ((voln‘𝑋)‘ 𝑛 ∈ ℕ (𝐷𝑛)))
145144eqcomd 2615 . . 3 (𝜑 → ((voln‘𝑋)‘ 𝑛 ∈ ℕ (𝐷𝑛)) = ((voln‘𝑋)‘𝐼))
146139, 145breqtrd 4603 . 2 (𝜑 → (𝑛 ∈ ℕ ↦ ((voln‘𝑋)‘(𝐷𝑛))) ⇝ ((voln‘𝑋)‘𝐼))
147 fveq2 6087 . . . . . 6 (𝑛 = 𝑚 → (𝐷𝑛) = (𝐷𝑚))
148147fveq2d 6091 . . . . 5 (𝑛 = 𝑚 → ((voln‘𝑋)‘(𝐷𝑛)) = ((voln‘𝑋)‘(𝐷𝑚)))
149148cbvmptv 4672 . . . 4 (𝑛 ∈ ℕ ↦ ((voln‘𝑋)‘(𝐷𝑛))) = (𝑚 ∈ ℕ ↦ ((voln‘𝑋)‘(𝐷𝑚)))
150149a1i 11 . . 3 (𝜑 → (𝑛 ∈ ℕ ↦ ((voln‘𝑋)‘(𝐷𝑛))) = (𝑚 ∈ ℕ ↦ ((voln‘𝑋)‘(𝐷𝑚))))
151 vonioolem2.n . . . 4 (𝜑𝑋 ≠ ∅)
152 vonioolem2.t . . . 4 ((𝜑𝑘𝑋) → (𝐴𝑘) < (𝐵𝑘))
153149eqcomi 2618 . . . 4 (𝑚 ∈ ℕ ↦ ((voln‘𝑋)‘(𝐷𝑚))) = (𝑛 ∈ ℕ ↦ ((voln‘𝑋)‘(𝐷𝑛)))
154 eqcom 2616 . . . . . . . . . 10 (𝑛 = 𝑚𝑚 = 𝑛)
155154imbi1i 337 . . . . . . . . 9 ((𝑛 = 𝑚 → ((𝐶𝑛)‘𝑘) = ((𝐶𝑚)‘𝑘)) ↔ (𝑚 = 𝑛 → ((𝐶𝑛)‘𝑘) = ((𝐶𝑚)‘𝑘)))
156 eqcom 2616 . . . . . . . . . 10 (((𝐶𝑛)‘𝑘) = ((𝐶𝑚)‘𝑘) ↔ ((𝐶𝑚)‘𝑘) = ((𝐶𝑛)‘𝑘))
157156imbi2i 324 . . . . . . . . 9 ((𝑚 = 𝑛 → ((𝐶𝑛)‘𝑘) = ((𝐶𝑚)‘𝑘)) ↔ (𝑚 = 𝑛 → ((𝐶𝑚)‘𝑘) = ((𝐶𝑛)‘𝑘)))
158155, 157bitri 262 . . . . . . . 8 ((𝑛 = 𝑚 → ((𝐶𝑛)‘𝑘) = ((𝐶𝑚)‘𝑘)) ↔ (𝑚 = 𝑛 → ((𝐶𝑚)‘𝑘) = ((𝐶𝑛)‘𝑘)))
15982, 158mpbi 218 . . . . . . 7 (𝑚 = 𝑛 → ((𝐶𝑚)‘𝑘) = ((𝐶𝑛)‘𝑘))
160159oveq2d 6542 . . . . . 6 (𝑚 = 𝑛 → ((𝐵𝑘) − ((𝐶𝑚)‘𝑘)) = ((𝐵𝑘) − ((𝐶𝑛)‘𝑘)))
161160prodeq2ad 38442 . . . . 5 (𝑚 = 𝑛 → ∏𝑘𝑋 ((𝐵𝑘) − ((𝐶𝑚)‘𝑘)) = ∏𝑘𝑋 ((𝐵𝑘) − ((𝐶𝑛)‘𝑘)))
162161cbvmptv 4672 . . . 4 (𝑚 ∈ ℕ ↦ ∏𝑘𝑋 ((𝐵𝑘) − ((𝐶𝑚)‘𝑘))) = (𝑛 ∈ ℕ ↦ ∏𝑘𝑋 ((𝐵𝑘) − ((𝐶𝑛)‘𝑘)))
163 eqid 2609 . . . 4 inf(ran (𝑘𝑋 ↦ ((𝐵𝑘) − (𝐴𝑘))), ℝ, < ) = inf(ran (𝑘𝑋 ↦ ((𝐵𝑘) − (𝐴𝑘))), ℝ, < )
164 eqid 2609 . . . 4 ((⌊‘(1 / inf(ran (𝑘𝑋 ↦ ((𝐵𝑘) − (𝐴𝑘))), ℝ, < ))) + 1) = ((⌊‘(1 / inf(ran (𝑘𝑋 ↦ ((𝐵𝑘) − (𝐴𝑘))), ℝ, < ))) + 1)
165 fveq2 6087 . . . . . . . . . . . 12 (𝑗 = 𝑘 → (𝐵𝑗) = (𝐵𝑘))
166 fveq2 6087 . . . . . . . . . . . 12 (𝑗 = 𝑘 → (𝐴𝑗) = (𝐴𝑘))
167165, 166oveq12d 6544 . . . . . . . . . . 11 (𝑗 = 𝑘 → ((𝐵𝑗) − (𝐴𝑗)) = ((𝐵𝑘) − (𝐴𝑘)))
168167cbvmptv 4672 . . . . . . . . . 10 (𝑗𝑋 ↦ ((𝐵𝑗) − (𝐴𝑗))) = (𝑘𝑋 ↦ ((𝐵𝑘) − (𝐴𝑘)))
169168rneqi 5259 . . . . . . . . 9 ran (𝑗𝑋 ↦ ((𝐵𝑗) − (𝐴𝑗))) = ran (𝑘𝑋 ↦ ((𝐵𝑘) − (𝐴𝑘)))
170169infeq1i 8244 . . . . . . . 8 inf(ran (𝑗𝑋 ↦ ((𝐵𝑗) − (𝐴𝑗))), ℝ, < ) = inf(ran (𝑘𝑋 ↦ ((𝐵𝑘) − (𝐴𝑘))), ℝ, < )
171170oveq2i 6537 . . . . . . 7 (1 / inf(ran (𝑗𝑋 ↦ ((𝐵𝑗) − (𝐴𝑗))), ℝ, < )) = (1 / inf(ran (𝑘𝑋 ↦ ((𝐵𝑘) − (𝐴𝑘))), ℝ, < ))
172171fveq2i 6090 . . . . . 6 (⌊‘(1 / inf(ran (𝑗𝑋 ↦ ((𝐵𝑗) − (𝐴𝑗))), ℝ, < ))) = (⌊‘(1 / inf(ran (𝑘𝑋 ↦ ((𝐵𝑘) − (𝐴𝑘))), ℝ, < )))
173172oveq1i 6536 . . . . 5 ((⌊‘(1 / inf(ran (𝑗𝑋 ↦ ((𝐵𝑗) − (𝐴𝑗))), ℝ, < ))) + 1) = ((⌊‘(1 / inf(ran (𝑘𝑋 ↦ ((𝐵𝑘) − (𝐴𝑘))), ℝ, < ))) + 1)
174173fveq2i 6090 . . . 4 (ℤ‘((⌊‘(1 / inf(ran (𝑗𝑋 ↦ ((𝐵𝑗) − (𝐴𝑗))), ℝ, < ))) + 1)) = (ℤ‘((⌊‘(1 / inf(ran (𝑘𝑋 ↦ ((𝐵𝑘) − (𝐴𝑘))), ℝ, < ))) + 1))
1751, 7, 22, 151, 152, 15, 25, 153, 162, 163, 164, 174vonioolem1 39354 . . 3 (𝜑 → (𝑚 ∈ ℕ ↦ ((voln‘𝑋)‘(𝐷𝑚))) ⇝ ∏𝑘𝑋 ((𝐵𝑘) − (𝐴𝑘)))
176150, 175eqbrtrd 4599 . 2 (𝜑 → (𝑛 ∈ ℕ ↦ ((voln‘𝑋)‘(𝐷𝑛))) ⇝ ∏𝑘𝑋 ((𝐵𝑘) − (𝐴𝑘)))
177 climuni 14079 . 2 (((𝑛 ∈ ℕ ↦ ((voln‘𝑋)‘(𝐷𝑛))) ⇝ ((voln‘𝑋)‘𝐼) ∧ (𝑛 ∈ ℕ ↦ ((voln‘𝑋)‘(𝐷𝑛))) ⇝ ∏𝑘𝑋 ((𝐵𝑘) − (𝐴𝑘))) → ((voln‘𝑋)‘𝐼) = ∏𝑘𝑋 ((𝐵𝑘) − (𝐴𝑘)))
178146, 176, 177syl2anc 690 1 (𝜑 → ((voln‘𝑋)‘𝐼) = ∏𝑘𝑋 ((𝐵𝑘) − (𝐴𝑘)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 382   = wceq 1474  wtru 1475  wcel 1976  wne 2779  wral 2895  Vcvv 3172  wss 3539  c0 3873   ciun 4449   class class class wbr 4577  cmpt 4637  dom cdm 5027  ran crn 5028  wf 5785  cfv 5789  (class class class)co 6526  Xcixp 7771  Fincfn 7818  infcinf 8207  cr 9791  0cc0 9792  1c1 9793   + caddc 9795  *cxr 9929   < clt 9930  cle 9931  cmin 10117   / cdiv 10535  cn 10869  cuz 11521  +crp 11666  (,)cioo 12004  [,)cico 12006  cfl 12410  cli 14011  cprod 14422  Meascmea 39125  volncvoln 39211
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1712  ax-4 1727  ax-5 1826  ax-6 1874  ax-7 1921  ax-8 1978  ax-9 1985  ax-10 2005  ax-11 2020  ax-12 2033  ax-13 2233  ax-ext 2589  ax-rep 4693  ax-sep 4703  ax-nul 4711  ax-pow 4763  ax-pr 4827  ax-un 6824  ax-inf2 8398  ax-cc 9117  ax-ac2 9145  ax-cnex 9848  ax-resscn 9849  ax-1cn 9850  ax-icn 9851  ax-addcl 9852  ax-addrcl 9853  ax-mulcl 9854  ax-mulrcl 9855  ax-mulcom 9856  ax-addass 9857  ax-mulass 9858  ax-distr 9859  ax-i2m1 9860  ax-1ne0 9861  ax-1rid 9862  ax-rnegex 9863  ax-rrecex 9864  ax-cnre 9865  ax-pre-lttri 9866  ax-pre-lttrn 9867  ax-pre-ltadd 9868  ax-pre-mulgt0 9869  ax-pre-sup 9870  ax-addf 9871  ax-mulf 9872
This theorem depends on definitions:  df-bi 195  df-or 383  df-an 384  df-3or 1031  df-3an 1032  df-tru 1477  df-fal 1480  df-ex 1695  df-nf 1700  df-sb 1867  df-eu 2461  df-mo 2462  df-clab 2596  df-cleq 2602  df-clel 2605  df-nfc 2739  df-ne 2781  df-nel 2782  df-ral 2900  df-rex 2901  df-reu 2902  df-rmo 2903  df-rab 2904  df-v 3174  df-sbc 3402  df-csb 3499  df-dif 3542  df-un 3544  df-in 3546  df-ss 3553  df-pss 3555  df-nul 3874  df-if 4036  df-pw 4109  df-sn 4125  df-pr 4127  df-tp 4129  df-op 4131  df-uni 4367  df-int 4405  df-iun 4451  df-iin 4452  df-disj 4548  df-br 4578  df-opab 4638  df-mpt 4639  df-tr 4675  df-eprel 4938  df-id 4942  df-po 4948  df-so 4949  df-fr 4986  df-se 4987  df-we 4988  df-xp 5033  df-rel 5034  df-cnv 5035  df-co 5036  df-dm 5037  df-rn 5038  df-res 5039  df-ima 5040  df-pred 5582  df-ord 5628  df-on 5629  df-lim 5630  df-suc 5631  df-iota 5753  df-fun 5791  df-fn 5792  df-f 5793  df-f1 5794  df-fo 5795  df-f1o 5796  df-fv 5797  df-isom 5798  df-riota 6488  df-ov 6529  df-oprab 6530  df-mpt2 6531  df-of 6772  df-om 6935  df-1st 7036  df-2nd 7037  df-supp 7160  df-tpos 7216  df-wrecs 7271  df-recs 7332  df-rdg 7370  df-1o 7424  df-2o 7425  df-oadd 7428  df-omul 7429  df-er 7606  df-map 7723  df-pm 7724  df-ixp 7772  df-en 7819  df-dom 7820  df-sdom 7821  df-fin 7822  df-fsupp 8136  df-fi 8177  df-sup 8208  df-inf 8209  df-oi 8275  df-card 8625  df-acn 8628  df-ac 8799  df-cda 8850  df-pnf 9932  df-mnf 9933  df-xr 9934  df-ltxr 9935  df-le 9936  df-sub 10119  df-neg 10120  df-div 10536  df-nn 10870  df-2 10928  df-3 10929  df-4 10930  df-5 10931  df-6 10932  df-7 10933  df-8 10934  df-9 10935  df-n0 11142  df-z 11213  df-dec 11328  df-uz 11522  df-q 11623  df-rp 11667  df-xneg 11780  df-xadd 11781  df-xmul 11782  df-ioo 12008  df-ico 12010  df-icc 12011  df-fz 12155  df-fzo 12292  df-fl 12412  df-seq 12621  df-exp 12680  df-hash 12937  df-cj 13635  df-re 13636  df-im 13637  df-sqrt 13771  df-abs 13772  df-clim 14015  df-rlim 14016  df-sum 14213  df-prod 14423  df-struct 15645  df-ndx 15646  df-slot 15647  df-base 15648  df-sets 15649  df-ress 15650  df-plusg 15729  df-mulr 15730  df-starv 15731  df-sca 15732  df-vsca 15733  df-ip 15734  df-tset 15735  df-ple 15736  df-ds 15739  df-unif 15740  df-hom 15741  df-cco 15742  df-rest 15854  df-topn 15855  df-0g 15873  df-gsum 15874  df-topgen 15875  df-pt 15876  df-prds 15879  df-pws 15881  df-xrs 15933  df-qtop 15938  df-imas 15939  df-xps 15941  df-mre 16017  df-mrc 16018  df-acs 16020  df-mgm 17013  df-sgrp 17055  df-mnd 17066  df-mhm 17106  df-submnd 17107  df-grp 17196  df-minusg 17197  df-sbg 17198  df-mulg 17312  df-subg 17362  df-ghm 17429  df-cntz 17521  df-cmn 17966  df-abl 17967  df-mgp 18261  df-ur 18273  df-ring 18320  df-cring 18321  df-oppr 18394  df-dvdsr 18412  df-unit 18413  df-invr 18443  df-dvr 18454  df-rnghom 18486  df-drng 18520  df-field 18521  df-subrg 18549  df-abv 18588  df-staf 18616  df-srng 18617  df-lmod 18636  df-lss 18702  df-lmhm 18791  df-lvec 18872  df-sra 18941  df-rgmod 18942  df-psmet 19507  df-xmet 19508  df-met 19509  df-bl 19510  df-mopn 19511  df-cnfld 19516  df-refld 19717  df-phl 19737  df-dsmm 19842  df-frlm 19857  df-top 20468  df-bases 20469  df-topon 20470  df-topsp 20471  df-cn 20788  df-cnp 20789  df-cmp 20947  df-tx 21122  df-hmeo 21315  df-xms 21882  df-ms 21883  df-tms 21884  df-nm 22144  df-ngp 22145  df-tng 22146  df-nrg 22147  df-nlm 22148  df-cncf 22436  df-clm 22618  df-cph 22720  df-tch 22721  df-rrx 22925  df-ovol 22984  df-vol 22985  df-salg 38988  df-sumge0 39039  df-mea 39126  df-ome 39163  df-caragen 39165  df-ovoln 39210  df-voln 39212
This theorem is referenced by:  vonioo  39356
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