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Theorem ovn0lem 41100
 Description: For any finite dimension, the Lebesgue outer measure of the empty set is zero. This is step (a)(ii) of the proof of Proposition 115D (a) of [Fremlin1] p. 30. (Contributed by Glauco Siliprandi, 11-Oct-2020.)
Hypotheses
Ref Expression
ovn0lem.x (𝜑𝑋 ∈ Fin)
ovn0lem.n0 (𝜑𝑋 ≠ ∅)
ovn0lem.m 𝑀 = {𝑧 ∈ ℝ* ∣ ∃𝑖 ∈ (((ℝ × ℝ) ↑𝑚 𝑋) ↑𝑚 ℕ)𝑧 = (Σ^‘(𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝑖𝑗))‘𝑘))))}
ovn0lem.infm (𝜑 → inf(𝑀, ℝ*, < ) ∈ (0[,]+∞))
ovn0lem.i 𝐼 = (𝑗 ∈ ℕ ↦ (𝑙𝑋 ↦ ⟨1, 0⟩))
Assertion
Ref Expression
ovn0lem (𝜑 → inf(𝑀, ℝ*, < ) = 0)
Distinct variable groups:   𝑖,𝐼,𝑗,𝑘   𝐼,𝑙,𝑗,𝑘   𝑖,𝑋,𝑗,𝑘,𝑧   𝑋,𝑙   𝜑,𝑗,𝑘,𝑙
Allowed substitution hints:   𝜑(𝑧,𝑖)   𝐼(𝑧)   𝑀(𝑧,𝑖,𝑗,𝑘,𝑙)

Proof of Theorem ovn0lem
StepHypRef Expression
1 iccssxr 12294 . . 3 (0[,]+∞) ⊆ ℝ*
2 ovn0lem.infm . . 3 (𝜑 → inf(𝑀, ℝ*, < ) ∈ (0[,]+∞))
31, 2sseldi 3634 . 2 (𝜑 → inf(𝑀, ℝ*, < ) ∈ ℝ*)
4 0xr 10124 . . 3 0 ∈ ℝ*
54a1i 11 . 2 (𝜑 → 0 ∈ ℝ*)
6 ovn0lem.m . . . . 5 𝑀 = {𝑧 ∈ ℝ* ∣ ∃𝑖 ∈ (((ℝ × ℝ) ↑𝑚 𝑋) ↑𝑚 ℕ)𝑧 = (Σ^‘(𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝑖𝑗))‘𝑘))))}
7 ssrab2 3720 . . . . 5 {𝑧 ∈ ℝ* ∣ ∃𝑖 ∈ (((ℝ × ℝ) ↑𝑚 𝑋) ↑𝑚 ℕ)𝑧 = (Σ^‘(𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝑖𝑗))‘𝑘))))} ⊆ ℝ*
86, 7eqsstri 3668 . . . 4 𝑀 ⊆ ℝ*
98a1i 11 . . 3 (𝜑𝑀 ⊆ ℝ*)
10 1re 10077 . . . . . . . . . . . . . 14 1 ∈ ℝ
11 0re 10078 . . . . . . . . . . . . . 14 0 ∈ ℝ
1210, 11pm3.2i 470 . . . . . . . . . . . . 13 (1 ∈ ℝ ∧ 0 ∈ ℝ)
13 opelxp 5180 . . . . . . . . . . . . 13 (⟨1, 0⟩ ∈ (ℝ × ℝ) ↔ (1 ∈ ℝ ∧ 0 ∈ ℝ))
1412, 13mpbir 221 . . . . . . . . . . . 12 ⟨1, 0⟩ ∈ (ℝ × ℝ)
1514a1i 11 . . . . . . . . . . 11 ((𝜑𝑙𝑋) → ⟨1, 0⟩ ∈ (ℝ × ℝ))
16 eqid 2651 . . . . . . . . . . 11 (𝑙𝑋 ↦ ⟨1, 0⟩) = (𝑙𝑋 ↦ ⟨1, 0⟩)
1715, 16fmptd 6425 . . . . . . . . . 10 (𝜑 → (𝑙𝑋 ↦ ⟨1, 0⟩):𝑋⟶(ℝ × ℝ))
18 reex 10065 . . . . . . . . . . . . 13 ℝ ∈ V
1918, 18xpex 7004 . . . . . . . . . . . 12 (ℝ × ℝ) ∈ V
2019a1i 11 . . . . . . . . . . 11 (𝜑 → (ℝ × ℝ) ∈ V)
21 ovn0lem.x . . . . . . . . . . 11 (𝜑𝑋 ∈ Fin)
22 elmapg 7912 . . . . . . . . . . 11 (((ℝ × ℝ) ∈ V ∧ 𝑋 ∈ Fin) → ((𝑙𝑋 ↦ ⟨1, 0⟩) ∈ ((ℝ × ℝ) ↑𝑚 𝑋) ↔ (𝑙𝑋 ↦ ⟨1, 0⟩):𝑋⟶(ℝ × ℝ)))
2320, 21, 22syl2anc 694 . . . . . . . . . 10 (𝜑 → ((𝑙𝑋 ↦ ⟨1, 0⟩) ∈ ((ℝ × ℝ) ↑𝑚 𝑋) ↔ (𝑙𝑋 ↦ ⟨1, 0⟩):𝑋⟶(ℝ × ℝ)))
2417, 23mpbird 247 . . . . . . . . 9 (𝜑 → (𝑙𝑋 ↦ ⟨1, 0⟩) ∈ ((ℝ × ℝ) ↑𝑚 𝑋))
2524adantr 480 . . . . . . . 8 ((𝜑𝑗 ∈ ℕ) → (𝑙𝑋 ↦ ⟨1, 0⟩) ∈ ((ℝ × ℝ) ↑𝑚 𝑋))
26 ovn0lem.i . . . . . . . 8 𝐼 = (𝑗 ∈ ℕ ↦ (𝑙𝑋 ↦ ⟨1, 0⟩))
2725, 26fmptd 6425 . . . . . . 7 (𝜑𝐼:ℕ⟶((ℝ × ℝ) ↑𝑚 𝑋))
28 ovexd 6720 . . . . . . . 8 (𝜑 → ((ℝ × ℝ) ↑𝑚 𝑋) ∈ V)
29 nnex 11064 . . . . . . . . 9 ℕ ∈ V
3029a1i 11 . . . . . . . 8 (𝜑 → ℕ ∈ V)
31 elmapg 7912 . . . . . . . 8 ((((ℝ × ℝ) ↑𝑚 𝑋) ∈ V ∧ ℕ ∈ V) → (𝐼 ∈ (((ℝ × ℝ) ↑𝑚 𝑋) ↑𝑚 ℕ) ↔ 𝐼:ℕ⟶((ℝ × ℝ) ↑𝑚 𝑋)))
3228, 30, 31syl2anc 694 . . . . . . 7 (𝜑 → (𝐼 ∈ (((ℝ × ℝ) ↑𝑚 𝑋) ↑𝑚 ℕ) ↔ 𝐼:ℕ⟶((ℝ × ℝ) ↑𝑚 𝑋)))
3327, 32mpbird 247 . . . . . 6 (𝜑𝐼 ∈ (((ℝ × ℝ) ↑𝑚 𝑋) ↑𝑚 ℕ))
34 ovn0lem.n0 . . . . . . . . . . . 12 (𝜑𝑋 ≠ ∅)
35 n0 3964 . . . . . . . . . . . 12 (𝑋 ≠ ∅ ↔ ∃𝑙 𝑙𝑋)
3634, 35sylib 208 . . . . . . . . . . 11 (𝜑 → ∃𝑙 𝑙𝑋)
3736adantr 480 . . . . . . . . . 10 ((𝜑𝑗 ∈ ℕ) → ∃𝑙 𝑙𝑋)
38 nfv 1883 . . . . . . . . . . . . 13 𝑘((𝜑𝑗 ∈ ℕ) ∧ 𝑙𝑋)
39 nfcv 2793 . . . . . . . . . . . . 13 𝑘(vol‘(([,) ∘ (𝐼𝑗))‘𝑙))
4021ad2antrr 762 . . . . . . . . . . . . 13 (((𝜑𝑗 ∈ ℕ) ∧ 𝑙𝑋) → 𝑋 ∈ Fin)
4127ffvelrnda 6399 . . . . . . . . . . . . . . . . . . . . 21 ((𝜑𝑗 ∈ ℕ) → (𝐼𝑗) ∈ ((ℝ × ℝ) ↑𝑚 𝑋))
42 elmapi 7921 . . . . . . . . . . . . . . . . . . . . 21 ((𝐼𝑗) ∈ ((ℝ × ℝ) ↑𝑚 𝑋) → (𝐼𝑗):𝑋⟶(ℝ × ℝ))
4341, 42syl 17 . . . . . . . . . . . . . . . . . . . 20 ((𝜑𝑗 ∈ ℕ) → (𝐼𝑗):𝑋⟶(ℝ × ℝ))
4443adantr 480 . . . . . . . . . . . . . . . . . . 19 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → (𝐼𝑗):𝑋⟶(ℝ × ℝ))
45 simpr 476 . . . . . . . . . . . . . . . . . . 19 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → 𝑘𝑋)
4644, 45fvovco 39695 . . . . . . . . . . . . . . . . . 18 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → (([,) ∘ (𝐼𝑗))‘𝑘) = ((1st ‘((𝐼𝑗)‘𝑘))[,)(2nd ‘((𝐼𝑗)‘𝑘))))
47 simpr 476 . . . . . . . . . . . . . . . . . . . . . . . 24 ((𝜑𝑗 ∈ ℕ) → 𝑗 ∈ ℕ)
4825elexd 3245 . . . . . . . . . . . . . . . . . . . . . . . 24 ((𝜑𝑗 ∈ ℕ) → (𝑙𝑋 ↦ ⟨1, 0⟩) ∈ V)
4926fvmpt2 6330 . . . . . . . . . . . . . . . . . . . . . . . 24 ((𝑗 ∈ ℕ ∧ (𝑙𝑋 ↦ ⟨1, 0⟩) ∈ V) → (𝐼𝑗) = (𝑙𝑋 ↦ ⟨1, 0⟩))
5047, 48, 49syl2anc 694 . . . . . . . . . . . . . . . . . . . . . . 23 ((𝜑𝑗 ∈ ℕ) → (𝐼𝑗) = (𝑙𝑋 ↦ ⟨1, 0⟩))
5150adantr 480 . . . . . . . . . . . . . . . . . . . . . 22 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → (𝐼𝑗) = (𝑙𝑋 ↦ ⟨1, 0⟩))
52 eqidd 2652 . . . . . . . . . . . . . . . . . . . . . 22 ((((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) ∧ 𝑙 = 𝑘) → ⟨1, 0⟩ = ⟨1, 0⟩)
5314elexi 3244 . . . . . . . . . . . . . . . . . . . . . . 23 ⟨1, 0⟩ ∈ V
5453a1i 11 . . . . . . . . . . . . . . . . . . . . . 22 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → ⟨1, 0⟩ ∈ V)
5551, 52, 45, 54fvmptd 6327 . . . . . . . . . . . . . . . . . . . . 21 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → ((𝐼𝑗)‘𝑘) = ⟨1, 0⟩)
5655fveq2d 6233 . . . . . . . . . . . . . . . . . . . 20 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → (1st ‘((𝐼𝑗)‘𝑘)) = (1st ‘⟨1, 0⟩))
5710elexi 3244 . . . . . . . . . . . . . . . . . . . . . 22 1 ∈ V
584elexi 3244 . . . . . . . . . . . . . . . . . . . . . 22 0 ∈ V
5957, 58op1st 7218 . . . . . . . . . . . . . . . . . . . . 21 (1st ‘⟨1, 0⟩) = 1
6059a1i 11 . . . . . . . . . . . . . . . . . . . 20 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → (1st ‘⟨1, 0⟩) = 1)
6156, 60eqtrd 2685 . . . . . . . . . . . . . . . . . . 19 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → (1st ‘((𝐼𝑗)‘𝑘)) = 1)
6255fveq2d 6233 . . . . . . . . . . . . . . . . . . . 20 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → (2nd ‘((𝐼𝑗)‘𝑘)) = (2nd ‘⟨1, 0⟩))
6357, 58op2nd 7219 . . . . . . . . . . . . . . . . . . . . 21 (2nd ‘⟨1, 0⟩) = 0
6463a1i 11 . . . . . . . . . . . . . . . . . . . 20 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → (2nd ‘⟨1, 0⟩) = 0)
6562, 64eqtrd 2685 . . . . . . . . . . . . . . . . . . 19 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → (2nd ‘((𝐼𝑗)‘𝑘)) = 0)
6661, 65oveq12d 6708 . . . . . . . . . . . . . . . . . 18 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → ((1st ‘((𝐼𝑗)‘𝑘))[,)(2nd ‘((𝐼𝑗)‘𝑘))) = (1[,)0))
67 0le1 10589 . . . . . . . . . . . . . . . . . . . 20 0 ≤ 1
6810rexri 10135 . . . . . . . . . . . . . . . . . . . . 21 1 ∈ ℝ*
69 ico0 12259 . . . . . . . . . . . . . . . . . . . . 21 ((1 ∈ ℝ* ∧ 0 ∈ ℝ*) → ((1[,)0) = ∅ ↔ 0 ≤ 1))
7068, 4, 69mp2an 708 . . . . . . . . . . . . . . . . . . . 20 ((1[,)0) = ∅ ↔ 0 ≤ 1)
7167, 70mpbir 221 . . . . . . . . . . . . . . . . . . 19 (1[,)0) = ∅
7271a1i 11 . . . . . . . . . . . . . . . . . 18 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → (1[,)0) = ∅)
7346, 66, 723eqtrd 2689 . . . . . . . . . . . . . . . . 17 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → (([,) ∘ (𝐼𝑗))‘𝑘) = ∅)
7473fveq2d 6233 . . . . . . . . . . . . . . . 16 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → (vol‘(([,) ∘ (𝐼𝑗))‘𝑘)) = (vol‘∅))
75 vol0 40493 . . . . . . . . . . . . . . . . 17 (vol‘∅) = 0
7675a1i 11 . . . . . . . . . . . . . . . 16 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → (vol‘∅) = 0)
7774, 76eqtrd 2685 . . . . . . . . . . . . . . 15 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → (vol‘(([,) ∘ (𝐼𝑗))‘𝑘)) = 0)
78 0cn 10070 . . . . . . . . . . . . . . . 16 0 ∈ ℂ
7978a1i 11 . . . . . . . . . . . . . . 15 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → 0 ∈ ℂ)
8077, 79eqeltrd 2730 . . . . . . . . . . . . . 14 (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → (vol‘(([,) ∘ (𝐼𝑗))‘𝑘)) ∈ ℂ)
8180adantlr 751 . . . . . . . . . . . . 13 ((((𝜑𝑗 ∈ ℕ) ∧ 𝑙𝑋) ∧ 𝑘𝑋) → (vol‘(([,) ∘ (𝐼𝑗))‘𝑘)) ∈ ℂ)
82 fveq2 6229 . . . . . . . . . . . . . 14 (𝑘 = 𝑙 → (([,) ∘ (𝐼𝑗))‘𝑘) = (([,) ∘ (𝐼𝑗))‘𝑙))
8382fveq2d 6233 . . . . . . . . . . . . 13 (𝑘 = 𝑙 → (vol‘(([,) ∘ (𝐼𝑗))‘𝑘)) = (vol‘(([,) ∘ (𝐼𝑗))‘𝑙)))
84 simpr 476 . . . . . . . . . . . . 13 (((𝜑𝑗 ∈ ℕ) ∧ 𝑙𝑋) → 𝑙𝑋)
85 eleq1 2718 . . . . . . . . . . . . . . . 16 (𝑘 = 𝑙 → (𝑘𝑋𝑙𝑋))
8685anbi2d 740 . . . . . . . . . . . . . . 15 (𝑘 = 𝑙 → (((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) ↔ ((𝜑𝑗 ∈ ℕ) ∧ 𝑙𝑋)))
8783eqeq1d 2653 . . . . . . . . . . . . . . 15 (𝑘 = 𝑙 → ((vol‘(([,) ∘ (𝐼𝑗))‘𝑘)) = 0 ↔ (vol‘(([,) ∘ (𝐼𝑗))‘𝑙)) = 0))
8886, 87imbi12d 333 . . . . . . . . . . . . . 14 (𝑘 = 𝑙 → ((((𝜑𝑗 ∈ ℕ) ∧ 𝑘𝑋) → (vol‘(([,) ∘ (𝐼𝑗))‘𝑘)) = 0) ↔ (((𝜑𝑗 ∈ ℕ) ∧ 𝑙𝑋) → (vol‘(([,) ∘ (𝐼𝑗))‘𝑙)) = 0)))
8988, 77chvarv 2299 . . . . . . . . . . . . 13 (((𝜑𝑗 ∈ ℕ) ∧ 𝑙𝑋) → (vol‘(([,) ∘ (𝐼𝑗))‘𝑙)) = 0)
9038, 39, 40, 81, 83, 84, 89fprod0 40146 . . . . . . . . . . . 12 (((𝜑𝑗 ∈ ℕ) ∧ 𝑙𝑋) → ∏𝑘𝑋 (vol‘(([,) ∘ (𝐼𝑗))‘𝑘)) = 0)
9190ex 449 . . . . . . . . . . 11 ((𝜑𝑗 ∈ ℕ) → (𝑙𝑋 → ∏𝑘𝑋 (vol‘(([,) ∘ (𝐼𝑗))‘𝑘)) = 0))
9291exlimdv 1901 . . . . . . . . . 10 ((𝜑𝑗 ∈ ℕ) → (∃𝑙 𝑙𝑋 → ∏𝑘𝑋 (vol‘(([,) ∘ (𝐼𝑗))‘𝑘)) = 0))
9337, 92mpd 15 . . . . . . . . 9 ((𝜑𝑗 ∈ ℕ) → ∏𝑘𝑋 (vol‘(([,) ∘ (𝐼𝑗))‘𝑘)) = 0)
9493mpteq2dva 4777 . . . . . . . 8 (𝜑 → (𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝐼𝑗))‘𝑘))) = (𝑗 ∈ ℕ ↦ 0))
9594fveq2d 6233 . . . . . . 7 (𝜑 → (Σ^‘(𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝐼𝑗))‘𝑘)))) = (Σ^‘(𝑗 ∈ ℕ ↦ 0)))
96 nfv 1883 . . . . . . . 8 𝑗𝜑
9796, 30sge0z 40910 . . . . . . 7 (𝜑 → (Σ^‘(𝑗 ∈ ℕ ↦ 0)) = 0)
98 eqidd 2652 . . . . . . 7 (𝜑 → 0 = 0)
9995, 97, 983eqtrrd 2690 . . . . . 6 (𝜑 → 0 = (Σ^‘(𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝐼𝑗))‘𝑘)))))
100 fveq1 6228 . . . . . . . . . . . . . . 15 (𝑖 = 𝐼 → (𝑖𝑗) = (𝐼𝑗))
101100coeq2d 5317 . . . . . . . . . . . . . 14 (𝑖 = 𝐼 → ([,) ∘ (𝑖𝑗)) = ([,) ∘ (𝐼𝑗)))
102101fveq1d 6231 . . . . . . . . . . . . 13 (𝑖 = 𝐼 → (([,) ∘ (𝑖𝑗))‘𝑘) = (([,) ∘ (𝐼𝑗))‘𝑘))
103102fveq2d 6233 . . . . . . . . . . . 12 (𝑖 = 𝐼 → (vol‘(([,) ∘ (𝑖𝑗))‘𝑘)) = (vol‘(([,) ∘ (𝐼𝑗))‘𝑘)))
104103ralrimivw 2996 . . . . . . . . . . 11 (𝑖 = 𝐼 → ∀𝑘𝑋 (vol‘(([,) ∘ (𝑖𝑗))‘𝑘)) = (vol‘(([,) ∘ (𝐼𝑗))‘𝑘)))
105104prodeq2d 14696 . . . . . . . . . 10 (𝑖 = 𝐼 → ∏𝑘𝑋 (vol‘(([,) ∘ (𝑖𝑗))‘𝑘)) = ∏𝑘𝑋 (vol‘(([,) ∘ (𝐼𝑗))‘𝑘)))
106105mpteq2dv 4778 . . . . . . . . 9 (𝑖 = 𝐼 → (𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝑖𝑗))‘𝑘))) = (𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝐼𝑗))‘𝑘))))
107106fveq2d 6233 . . . . . . . 8 (𝑖 = 𝐼 → (Σ^‘(𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝑖𝑗))‘𝑘)))) = (Σ^‘(𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝐼𝑗))‘𝑘)))))
108107eqeq2d 2661 . . . . . . 7 (𝑖 = 𝐼 → (0 = (Σ^‘(𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝑖𝑗))‘𝑘)))) ↔ 0 = (Σ^‘(𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝐼𝑗))‘𝑘))))))
109108rspcev 3340 . . . . . 6 ((𝐼 ∈ (((ℝ × ℝ) ↑𝑚 𝑋) ↑𝑚 ℕ) ∧ 0 = (Σ^‘(𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝐼𝑗))‘𝑘))))) → ∃𝑖 ∈ (((ℝ × ℝ) ↑𝑚 𝑋) ↑𝑚 ℕ)0 = (Σ^‘(𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝑖𝑗))‘𝑘)))))
11033, 99, 109syl2anc 694 . . . . 5 (𝜑 → ∃𝑖 ∈ (((ℝ × ℝ) ↑𝑚 𝑋) ↑𝑚 ℕ)0 = (Σ^‘(𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝑖𝑗))‘𝑘)))))
1115, 110jca 553 . . . 4 (𝜑 → (0 ∈ ℝ* ∧ ∃𝑖 ∈ (((ℝ × ℝ) ↑𝑚 𝑋) ↑𝑚 ℕ)0 = (Σ^‘(𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝑖𝑗))‘𝑘))))))
112 eqeq1 2655 . . . . . 6 (𝑧 = 0 → (𝑧 = (Σ^‘(𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝑖𝑗))‘𝑘)))) ↔ 0 = (Σ^‘(𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝑖𝑗))‘𝑘))))))
113112rexbidv 3081 . . . . 5 (𝑧 = 0 → (∃𝑖 ∈ (((ℝ × ℝ) ↑𝑚 𝑋) ↑𝑚 ℕ)𝑧 = (Σ^‘(𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝑖𝑗))‘𝑘)))) ↔ ∃𝑖 ∈ (((ℝ × ℝ) ↑𝑚 𝑋) ↑𝑚 ℕ)0 = (Σ^‘(𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝑖𝑗))‘𝑘))))))
114113, 6elrab2 3399 . . . 4 (0 ∈ 𝑀 ↔ (0 ∈ ℝ* ∧ ∃𝑖 ∈ (((ℝ × ℝ) ↑𝑚 𝑋) ↑𝑚 ℕ)0 = (Σ^‘(𝑗 ∈ ℕ ↦ ∏𝑘𝑋 (vol‘(([,) ∘ (𝑖𝑗))‘𝑘))))))
115111, 114sylibr 224 . . 3 (𝜑 → 0 ∈ 𝑀)
116 infxrlb 12202 . . 3 ((𝑀 ⊆ ℝ* ∧ 0 ∈ 𝑀) → inf(𝑀, ℝ*, < ) ≤ 0)
1179, 115, 116syl2anc 694 . 2 (𝜑 → inf(𝑀, ℝ*, < ) ≤ 0)
118 pnfxr 10130 . . . 4 +∞ ∈ ℝ*
119118a1i 11 . . 3 (𝜑 → +∞ ∈ ℝ*)
120 iccgelb 12268 . . 3 ((0 ∈ ℝ* ∧ +∞ ∈ ℝ* ∧ inf(𝑀, ℝ*, < ) ∈ (0[,]+∞)) → 0 ≤ inf(𝑀, ℝ*, < ))
1215, 119, 2, 120syl3anc 1366 . 2 (𝜑 → 0 ≤ inf(𝑀, ℝ*, < ))
1223, 5, 117, 121xrletrid 12024 1 (𝜑 → inf(𝑀, ℝ*, < ) = 0)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 196   ∧ wa 383   = wceq 1523  ∃wex 1744   ∈ wcel 2030   ≠ wne 2823  ∃wrex 2942  {crab 2945  Vcvv 3231   ⊆ wss 3607  ∅c0 3948  ⟨cop 4216   class class class wbr 4685   ↦ cmpt 4762   × cxp 5141   ∘ ccom 5147  ⟶wf 5922  ‘cfv 5926  (class class class)co 6690  1st c1st 7208  2nd c2nd 7209   ↑𝑚 cmap 7899  Fincfn 7997  infcinf 8388  ℂcc 9972  ℝcr 9973  0cc0 9974  1c1 9975  +∞cpnf 10109  ℝ*cxr 10111   < clt 10112   ≤ cle 10113  ℕcn 11058  [,)cico 12215  [,]cicc 12216  ∏cprod 14679  volcvol 23278  Σ^csumge0 40897 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-rep 4804  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991  ax-inf2 8576  ax-cnex 10030  ax-resscn 10031  ax-1cn 10032  ax-icn 10033  ax-addcl 10034  ax-addrcl 10035  ax-mulcl 10036  ax-mulrcl 10037  ax-mulcom 10038  ax-addass 10039  ax-mulass 10040  ax-distr 10041  ax-i2m1 10042  ax-1ne0 10043  ax-1rid 10044  ax-rnegex 10045  ax-rrecex 10046  ax-cnre 10047  ax-pre-lttri 10048  ax-pre-lttrn 10049  ax-pre-ltadd 10050  ax-pre-mulgt0 10051  ax-pre-sup 10052 This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1055  df-3an 1056  df-tru 1526  df-fal 1529  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-nel 2927  df-ral 2946  df-rex 2947  df-reu 2948  df-rmo 2949  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-pss 3623  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-tp 4215  df-op 4217  df-uni 4469  df-int 4508  df-iun 4554  df-br 4686  df-opab 4746  df-mpt 4763  df-tr 4786  df-id 5053  df-eprel 5058  df-po 5064  df-so 5065  df-fr 5102  df-se 5103  df-we 5104  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-pred 5718  df-ord 5764  df-on 5765  df-lim 5766  df-suc 5767  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-isom 5935  df-riota 6651  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-of 6939  df-om 7108  df-1st 7210  df-2nd 7211  df-wrecs 7452  df-recs 7513  df-rdg 7551  df-1o 7605  df-2o 7606  df-oadd 7609  df-er 7787  df-map 7901  df-en 7998  df-dom 7999  df-sdom 8000  df-fin 8001  df-sup 8389  df-inf 8390  df-oi 8456  df-card 8803  df-cda 9028  df-pnf 10114  df-mnf 10115  df-xr 10116  df-ltxr 10117  df-le 10118  df-sub 10306  df-neg 10307  df-div 10723  df-nn 11059  df-2 11117  df-3 11118  df-n0 11331  df-z 11416  df-uz 11726  df-q 11827  df-rp 11871  df-xadd 11985  df-ioo 12217  df-ico 12219  df-icc 12220  df-fz 12365  df-fzo 12505  df-fl 12633  df-seq 12842  df-exp 12901  df-hash 13158  df-cj 13883  df-re 13884  df-im 13885  df-sqrt 14019  df-abs 14020  df-clim 14263  df-sum 14461  df-prod 14680  df-xmet 19787  df-met 19788  df-ovol 23279  df-vol 23280  df-sumge0 40898 This theorem is referenced by:  ovn0  41101
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