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Theorem ovoliunnul 25269
Description: A countable union of nullsets is null. (Contributed by Mario Carneiro, 8-Apr-2015.)
Assertion
Ref Expression
ovoliunnul ((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) → (vol*‘ 𝑛𝐴 𝐵) = 0)
Distinct variable group:   𝐴,𝑛
Allowed substitution hint:   𝐵(𝑛)

Proof of Theorem ovoliunnul
Dummy variables 𝑓 𝑘 𝑥 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 iuneq1 5013 . . . . . 6 (𝐴 = ∅ → 𝑛𝐴 𝐵 = 𝑛 ∈ ∅ 𝐵)
2 0iun 5066 . . . . . 6 𝑛 ∈ ∅ 𝐵 = ∅
31, 2eqtrdi 2787 . . . . 5 (𝐴 = ∅ → 𝑛𝐴 𝐵 = ∅)
43fveq2d 6895 . . . 4 (𝐴 = ∅ → (vol*‘ 𝑛𝐴 𝐵) = (vol*‘∅))
5 ovol0 25255 . . . 4 (vol*‘∅) = 0
64, 5eqtrdi 2787 . . 3 (𝐴 = ∅ → (vol*‘ 𝑛𝐴 𝐵) = 0)
76a1i 11 . 2 ((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) → (𝐴 = ∅ → (vol*‘ 𝑛𝐴 𝐵) = 0))
8 reldom 8951 . . . . . 6 Rel ≼
98brrelex1i 5732 . . . . 5 (𝐴 ≼ ℕ → 𝐴 ∈ V)
109adantr 480 . . . 4 ((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) → 𝐴 ∈ V)
11 0sdomg 9110 . . . 4 (𝐴 ∈ V → (∅ ≺ 𝐴𝐴 ≠ ∅))
1210, 11syl 17 . . 3 ((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) → (∅ ≺ 𝐴𝐴 ≠ ∅))
13 fodomr 9134 . . . . . 6 ((∅ ≺ 𝐴𝐴 ≼ ℕ) → ∃𝑓 𝑓:ℕ–onto𝐴)
1413expcom 413 . . . . 5 (𝐴 ≼ ℕ → (∅ ≺ 𝐴 → ∃𝑓 𝑓:ℕ–onto𝐴))
1514adantr 480 . . . 4 ((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) → (∅ ≺ 𝐴 → ∃𝑓 𝑓:ℕ–onto𝐴))
16 eliun 5001 . . . . . . . . . 10 (𝑥 𝑛𝐴 𝐵 ↔ ∃𝑛𝐴 𝑥𝐵)
17 nfv 1916 . . . . . . . . . . 11 𝑛 𝑓:ℕ–onto𝐴
18 nfcv 2902 . . . . . . . . . . . . 13 𝑛
19 nfcsb1v 3918 . . . . . . . . . . . . 13 𝑛(𝑓𝑘) / 𝑛𝐵
2018, 19nfiun 5027 . . . . . . . . . . . 12 𝑛 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵
2120nfcri 2889 . . . . . . . . . . 11 𝑛 𝑥 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵
22 foelrn 7108 . . . . . . . . . . . . 13 ((𝑓:ℕ–onto𝐴𝑛𝐴) → ∃𝑘 ∈ ℕ 𝑛 = (𝑓𝑘))
2322ex 412 . . . . . . . . . . . 12 (𝑓:ℕ–onto𝐴 → (𝑛𝐴 → ∃𝑘 ∈ ℕ 𝑛 = (𝑓𝑘)))
24 csbeq1a 3907 . . . . . . . . . . . . . . . . . . . 20 (𝑛 = (𝑓𝑘) → 𝐵 = (𝑓𝑘) / 𝑛𝐵)
2524adantl 481 . . . . . . . . . . . . . . . . . . 19 ((𝑓:ℕ–onto𝐴𝑛 = (𝑓𝑘)) → 𝐵 = (𝑓𝑘) / 𝑛𝐵)
2625eleq2d 2818 . . . . . . . . . . . . . . . . . 18 ((𝑓:ℕ–onto𝐴𝑛 = (𝑓𝑘)) → (𝑥𝐵𝑥(𝑓𝑘) / 𝑛𝐵))
2726biimpd 228 . . . . . . . . . . . . . . . . 17 ((𝑓:ℕ–onto𝐴𝑛 = (𝑓𝑘)) → (𝑥𝐵𝑥(𝑓𝑘) / 𝑛𝐵))
2827impancom 451 . . . . . . . . . . . . . . . 16 ((𝑓:ℕ–onto𝐴𝑥𝐵) → (𝑛 = (𝑓𝑘) → 𝑥(𝑓𝑘) / 𝑛𝐵))
2928reximdv 3169 . . . . . . . . . . . . . . 15 ((𝑓:ℕ–onto𝐴𝑥𝐵) → (∃𝑘 ∈ ℕ 𝑛 = (𝑓𝑘) → ∃𝑘 ∈ ℕ 𝑥(𝑓𝑘) / 𝑛𝐵))
30 eliun 5001 . . . . . . . . . . . . . . 15 (𝑥 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵 ↔ ∃𝑘 ∈ ℕ 𝑥(𝑓𝑘) / 𝑛𝐵)
3129, 30imbitrrdi 251 . . . . . . . . . . . . . 14 ((𝑓:ℕ–onto𝐴𝑥𝐵) → (∃𝑘 ∈ ℕ 𝑛 = (𝑓𝑘) → 𝑥 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵))
3231ex 412 . . . . . . . . . . . . 13 (𝑓:ℕ–onto𝐴 → (𝑥𝐵 → (∃𝑘 ∈ ℕ 𝑛 = (𝑓𝑘) → 𝑥 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵)))
3332com23 86 . . . . . . . . . . . 12 (𝑓:ℕ–onto𝐴 → (∃𝑘 ∈ ℕ 𝑛 = (𝑓𝑘) → (𝑥𝐵𝑥 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵)))
3423, 33syld 47 . . . . . . . . . . 11 (𝑓:ℕ–onto𝐴 → (𝑛𝐴 → (𝑥𝐵𝑥 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵)))
3517, 21, 34rexlimd 3262 . . . . . . . . . 10 (𝑓:ℕ–onto𝐴 → (∃𝑛𝐴 𝑥𝐵𝑥 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵))
3616, 35biimtrid 241 . . . . . . . . 9 (𝑓:ℕ–onto𝐴 → (𝑥 𝑛𝐴 𝐵𝑥 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵))
3736ssrdv 3988 . . . . . . . 8 (𝑓:ℕ–onto𝐴 𝑛𝐴 𝐵 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵)
3837adantl 481 . . . . . . 7 (((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) → 𝑛𝐴 𝐵 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵)
39 fof 6805 . . . . . . . . . . . . 13 (𝑓:ℕ–onto𝐴𝑓:ℕ⟶𝐴)
4039adantl 481 . . . . . . . . . . . 12 (((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) → 𝑓:ℕ⟶𝐴)
4140ffvelcdmda 7086 . . . . . . . . . . 11 ((((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) ∧ 𝑘 ∈ ℕ) → (𝑓𝑘) ∈ 𝐴)
42 simpllr 773 . . . . . . . . . . 11 ((((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) ∧ 𝑘 ∈ ℕ) → ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0))
43 nfcv 2902 . . . . . . . . . . . . . 14 𝑛
4419, 43nfss 3974 . . . . . . . . . . . . 13 𝑛(𝑓𝑘) / 𝑛𝐵 ⊆ ℝ
45 nfcv 2902 . . . . . . . . . . . . . . 15 𝑛vol*
4645, 19nffv 6901 . . . . . . . . . . . . . 14 𝑛(vol*‘(𝑓𝑘) / 𝑛𝐵)
4746nfeq1 2917 . . . . . . . . . . . . 13 𝑛(vol*‘(𝑓𝑘) / 𝑛𝐵) = 0
4844, 47nfan 1901 . . . . . . . . . . . 12 𝑛((𝑓𝑘) / 𝑛𝐵 ⊆ ℝ ∧ (vol*‘(𝑓𝑘) / 𝑛𝐵) = 0)
4924sseq1d 4013 . . . . . . . . . . . . 13 (𝑛 = (𝑓𝑘) → (𝐵 ⊆ ℝ ↔ (𝑓𝑘) / 𝑛𝐵 ⊆ ℝ))
5024fveqeq2d 6899 . . . . . . . . . . . . 13 (𝑛 = (𝑓𝑘) → ((vol*‘𝐵) = 0 ↔ (vol*‘(𝑓𝑘) / 𝑛𝐵) = 0))
5149, 50anbi12d 630 . . . . . . . . . . . 12 (𝑛 = (𝑓𝑘) → ((𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0) ↔ ((𝑓𝑘) / 𝑛𝐵 ⊆ ℝ ∧ (vol*‘(𝑓𝑘) / 𝑛𝐵) = 0)))
5248, 51rspc 3600 . . . . . . . . . . 11 ((𝑓𝑘) ∈ 𝐴 → (∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0) → ((𝑓𝑘) / 𝑛𝐵 ⊆ ℝ ∧ (vol*‘(𝑓𝑘) / 𝑛𝐵) = 0)))
5341, 42, 52sylc 65 . . . . . . . . . 10 ((((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) ∧ 𝑘 ∈ ℕ) → ((𝑓𝑘) / 𝑛𝐵 ⊆ ℝ ∧ (vol*‘(𝑓𝑘) / 𝑛𝐵) = 0))
5453simpld 494 . . . . . . . . 9 ((((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) ∧ 𝑘 ∈ ℕ) → (𝑓𝑘) / 𝑛𝐵 ⊆ ℝ)
5554ralrimiva 3145 . . . . . . . 8 (((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) → ∀𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵 ⊆ ℝ)
56 iunss 5048 . . . . . . . 8 ( 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵 ⊆ ℝ ↔ ∀𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵 ⊆ ℝ)
5755, 56sylibr 233 . . . . . . 7 (((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) → 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵 ⊆ ℝ)
58 eqid 2731 . . . . . . . . . 10 seq1( + , (𝑘 ∈ ℕ ↦ (vol*‘(𝑓𝑘) / 𝑛𝐵))) = seq1( + , (𝑘 ∈ ℕ ↦ (vol*‘(𝑓𝑘) / 𝑛𝐵)))
59 eqid 2731 . . . . . . . . . 10 (𝑘 ∈ ℕ ↦ (vol*‘(𝑓𝑘) / 𝑛𝐵)) = (𝑘 ∈ ℕ ↦ (vol*‘(𝑓𝑘) / 𝑛𝐵))
6053simprd 495 . . . . . . . . . . 11 ((((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) ∧ 𝑘 ∈ ℕ) → (vol*‘(𝑓𝑘) / 𝑛𝐵) = 0)
61 0re 11223 . . . . . . . . . . 11 0 ∈ ℝ
6260, 61eqeltrdi 2840 . . . . . . . . . 10 ((((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) ∧ 𝑘 ∈ ℕ) → (vol*‘(𝑓𝑘) / 𝑛𝐵) ∈ ℝ)
6360mpteq2dva 5248 . . . . . . . . . . . . 13 (((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) → (𝑘 ∈ ℕ ↦ (vol*‘(𝑓𝑘) / 𝑛𝐵)) = (𝑘 ∈ ℕ ↦ 0))
64 fconstmpt 5738 . . . . . . . . . . . . . 14 (ℕ × {0}) = (𝑘 ∈ ℕ ↦ 0)
65 nnuz 12872 . . . . . . . . . . . . . . 15 ℕ = (ℤ‘1)
6665xpeq1i 5702 . . . . . . . . . . . . . 14 (ℕ × {0}) = ((ℤ‘1) × {0})
6764, 66eqtr3i 2761 . . . . . . . . . . . . 13 (𝑘 ∈ ℕ ↦ 0) = ((ℤ‘1) × {0})
6863, 67eqtrdi 2787 . . . . . . . . . . . 12 (((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) → (𝑘 ∈ ℕ ↦ (vol*‘(𝑓𝑘) / 𝑛𝐵)) = ((ℤ‘1) × {0}))
6968seqeq3d 13981 . . . . . . . . . . 11 (((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) → seq1( + , (𝑘 ∈ ℕ ↦ (vol*‘(𝑓𝑘) / 𝑛𝐵))) = seq1( + , ((ℤ‘1) × {0})))
70 1z 12599 . . . . . . . . . . . 12 1 ∈ ℤ
71 serclim0 15528 . . . . . . . . . . . 12 (1 ∈ ℤ → seq1( + , ((ℤ‘1) × {0})) ⇝ 0)
72 seqex 13975 . . . . . . . . . . . . 13 seq1( + , ((ℤ‘1) × {0})) ∈ V
73 c0ex 11215 . . . . . . . . . . . . 13 0 ∈ V
7472, 73breldm 5908 . . . . . . . . . . . 12 (seq1( + , ((ℤ‘1) × {0})) ⇝ 0 → seq1( + , ((ℤ‘1) × {0})) ∈ dom ⇝ )
7570, 71, 74mp2b 10 . . . . . . . . . . 11 seq1( + , ((ℤ‘1) × {0})) ∈ dom ⇝
7669, 75eqeltrdi 2840 . . . . . . . . . 10 (((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) → seq1( + , (𝑘 ∈ ℕ ↦ (vol*‘(𝑓𝑘) / 𝑛𝐵))) ∈ dom ⇝ )
7758, 59, 54, 62, 76ovoliun2 25268 . . . . . . . . 9 (((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) → (vol*‘ 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵) ≤ Σ𝑘 ∈ ℕ (vol*‘(𝑓𝑘) / 𝑛𝐵))
7860sumeq2dv 15656 . . . . . . . . . 10 (((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) → Σ𝑘 ∈ ℕ (vol*‘(𝑓𝑘) / 𝑛𝐵) = Σ𝑘 ∈ ℕ 0)
7965eqimssi 4042 . . . . . . . . . . . 12 ℕ ⊆ (ℤ‘1)
8079orci 862 . . . . . . . . . . 11 (ℕ ⊆ (ℤ‘1) ∨ ℕ ∈ Fin)
81 sumz 15675 . . . . . . . . . . 11 ((ℕ ⊆ (ℤ‘1) ∨ ℕ ∈ Fin) → Σ𝑘 ∈ ℕ 0 = 0)
8280, 81ax-mp 5 . . . . . . . . . 10 Σ𝑘 ∈ ℕ 0 = 0
8378, 82eqtrdi 2787 . . . . . . . . 9 (((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) → Σ𝑘 ∈ ℕ (vol*‘(𝑓𝑘) / 𝑛𝐵) = 0)
8477, 83breqtrd 5174 . . . . . . . 8 (((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) → (vol*‘ 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵) ≤ 0)
85 ovolge0 25243 . . . . . . . . 9 ( 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵 ⊆ ℝ → 0 ≤ (vol*‘ 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵))
8657, 85syl 17 . . . . . . . 8 (((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) → 0 ≤ (vol*‘ 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵))
87 ovolcl 25240 . . . . . . . . . 10 ( 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵 ⊆ ℝ → (vol*‘ 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵) ∈ ℝ*)
8857, 87syl 17 . . . . . . . . 9 (((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) → (vol*‘ 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵) ∈ ℝ*)
89 0xr 11268 . . . . . . . . 9 0 ∈ ℝ*
90 xrletri3 13140 . . . . . . . . 9 (((vol*‘ 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵) ∈ ℝ* ∧ 0 ∈ ℝ*) → ((vol*‘ 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵) = 0 ↔ ((vol*‘ 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵) ≤ 0 ∧ 0 ≤ (vol*‘ 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵))))
9188, 89, 90sylancl 585 . . . . . . . 8 (((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) → ((vol*‘ 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵) = 0 ↔ ((vol*‘ 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵) ≤ 0 ∧ 0 ≤ (vol*‘ 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵))))
9284, 86, 91mpbir2and 710 . . . . . . 7 (((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) → (vol*‘ 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵) = 0)
93 ovolssnul 25249 . . . . . . 7 (( 𝑛𝐴 𝐵 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵 ⊆ ℝ ∧ (vol*‘ 𝑘 ∈ ℕ (𝑓𝑘) / 𝑛𝐵) = 0) → (vol*‘ 𝑛𝐴 𝐵) = 0)
9438, 57, 92, 93syl3anc 1370 . . . . . 6 (((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) ∧ 𝑓:ℕ–onto𝐴) → (vol*‘ 𝑛𝐴 𝐵) = 0)
9594ex 412 . . . . 5 ((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) → (𝑓:ℕ–onto𝐴 → (vol*‘ 𝑛𝐴 𝐵) = 0))
9695exlimdv 1935 . . . 4 ((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) → (∃𝑓 𝑓:ℕ–onto𝐴 → (vol*‘ 𝑛𝐴 𝐵) = 0))
9715, 96syld 47 . . 3 ((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) → (∅ ≺ 𝐴 → (vol*‘ 𝑛𝐴 𝐵) = 0))
9812, 97sylbird 260 . 2 ((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) → (𝐴 ≠ ∅ → (vol*‘ 𝑛𝐴 𝐵) = 0))
997, 98pm2.61dne 3027 1 ((𝐴 ≼ ℕ ∧ ∀𝑛𝐴 (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) = 0)) → (vol*‘ 𝑛𝐴 𝐵) = 0)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 395  wo 844   = wceq 1540  wex 1780  wcel 2105  wne 2939  wral 3060  wrex 3069  Vcvv 3473  csb 3893  wss 3948  c0 4322  {csn 4628   ciun 4997   class class class wbr 5148  cmpt 5231   × cxp 5674  dom cdm 5676  wf 6539  ontowfo 6541  cfv 6543  cdom 8943  csdm 8944  Fincfn 8945  cr 11115  0cc0 11116  1c1 11117   + caddc 11119  *cxr 11254  cle 11256  cn 12219  cz 12565  cuz 12829  seqcseq 13973  cli 15435  Σcsu 15639  vol*covol 25224
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1912  ax-6 1970  ax-7 2010  ax-8 2107  ax-9 2115  ax-10 2136  ax-11 2153  ax-12 2170  ax-ext 2702  ax-rep 5285  ax-sep 5299  ax-nul 5306  ax-pow 5363  ax-pr 5427  ax-un 7729  ax-inf2 9642  ax-cc 10436  ax-cnex 11172  ax-resscn 11173  ax-1cn 11174  ax-icn 11175  ax-addcl 11176  ax-addrcl 11177  ax-mulcl 11178  ax-mulrcl 11179  ax-mulcom 11180  ax-addass 11181  ax-mulass 11182  ax-distr 11183  ax-i2m1 11184  ax-1ne0 11185  ax-1rid 11186  ax-rnegex 11187  ax-rrecex 11188  ax-cnre 11189  ax-pre-lttri 11190  ax-pre-lttrn 11191  ax-pre-ltadd 11192  ax-pre-mulgt0 11193  ax-pre-sup 11194
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1781  df-nf 1785  df-sb 2067  df-mo 2533  df-eu 2562  df-clab 2709  df-cleq 2723  df-clel 2809  df-nfc 2884  df-ne 2940  df-nel 3046  df-ral 3061  df-rex 3070  df-rmo 3375  df-reu 3376  df-rab 3432  df-v 3475  df-sbc 3778  df-csb 3894  df-dif 3951  df-un 3953  df-in 3955  df-ss 3965  df-pss 3967  df-nul 4323  df-if 4529  df-pw 4604  df-sn 4629  df-pr 4631  df-op 4635  df-uni 4909  df-int 4951  df-iun 4999  df-br 5149  df-opab 5211  df-mpt 5232  df-tr 5266  df-id 5574  df-eprel 5580  df-po 5588  df-so 5589  df-fr 5631  df-se 5632  df-we 5633  df-xp 5682  df-rel 5683  df-cnv 5684  df-co 5685  df-dm 5686  df-rn 5687  df-res 5688  df-ima 5689  df-pred 6300  df-ord 6367  df-on 6368  df-lim 6369  df-suc 6370  df-iota 6495  df-fun 6545  df-fn 6546  df-f 6547  df-f1 6548  df-fo 6549  df-f1o 6550  df-fv 6551  df-isom 6552  df-riota 7368  df-ov 7415  df-oprab 7416  df-mpo 7417  df-of 7674  df-om 7860  df-1st 7979  df-2nd 7980  df-frecs 8272  df-wrecs 8303  df-recs 8377  df-rdg 8416  df-1o 8472  df-2o 8473  df-er 8709  df-map 8828  df-pm 8829  df-en 8946  df-dom 8947  df-sdom 8948  df-fin 8949  df-sup 9443  df-inf 9444  df-oi 9511  df-dju 9902  df-card 9940  df-pnf 11257  df-mnf 11258  df-xr 11259  df-ltxr 11260  df-le 11261  df-sub 11453  df-neg 11454  df-div 11879  df-nn 12220  df-2 12282  df-3 12283  df-n0 12480  df-z 12566  df-uz 12830  df-q 12940  df-rp 12982  df-xadd 13100  df-ioo 13335  df-ico 13337  df-icc 13338  df-fz 13492  df-fzo 13635  df-fl 13764  df-seq 13974  df-exp 14035  df-hash 14298  df-cj 15053  df-re 15054  df-im 15055  df-sqrt 15189  df-abs 15190  df-clim 15439  df-rlim 15440  df-sum 15640  df-xmet 21141  df-met 21142  df-ovol 25226
This theorem is referenced by: (None)
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