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Theorem voliune 33227
Description: The Lebesgue measure function is countably additive. This formulation on the extended reals, allows for +∞ for the measure of any set in the sum. Cf. ovoliun 25022 and voliun 25071. (Contributed by Thierry Arnoux, 16-Oct-2017.)
Assertion
Ref Expression
voliune ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) → (vol‘ 𝑛 ∈ ℕ 𝐴) = Σ*𝑛 ∈ ℕ(vol‘𝐴))

Proof of Theorem voliune
Dummy variable 𝑘 is distinct from all other variables.
StepHypRef Expression
1 r19.26 3112 . . . . 5 (∀𝑛 ∈ ℕ (𝐴 ∈ dom vol ∧ (vol‘𝐴) ∈ ℝ) ↔ (∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ))
2 eqid 2733 . . . . . 6 seq1( + , (𝑛 ∈ ℕ ↦ (vol‘𝐴))) = seq1( + , (𝑛 ∈ ℕ ↦ (vol‘𝐴)))
3 eqid 2733 . . . . . 6 (𝑛 ∈ ℕ ↦ (vol‘𝐴)) = (𝑛 ∈ ℕ ↦ (vol‘𝐴))
42, 3voliun 25071 . . . . 5 ((∀𝑛 ∈ ℕ (𝐴 ∈ dom vol ∧ (vol‘𝐴) ∈ ℝ) ∧ Disj 𝑛 ∈ ℕ 𝐴) → (vol‘ 𝑛 ∈ ℕ 𝐴) = sup(ran seq1( + , (𝑛 ∈ ℕ ↦ (vol‘𝐴))), ℝ*, < ))
51, 4sylanbr 583 . . . 4 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ) ∧ Disj 𝑛 ∈ ℕ 𝐴) → (vol‘ 𝑛 ∈ ℕ 𝐴) = sup(ran seq1( + , (𝑛 ∈ ℕ ↦ (vol‘𝐴))), ℝ*, < ))
65an32s 651 . . 3 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ) → (vol‘ 𝑛 ∈ ℕ 𝐴) = sup(ran seq1( + , (𝑛 ∈ ℕ ↦ (vol‘𝐴))), ℝ*, < ))
7 nfra1 3282 . . . . . . 7 𝑛𝑛 ∈ ℕ 𝐴 ∈ dom vol
8 nfra1 3282 . . . . . . 7 𝑛𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ
97, 8nfan 1903 . . . . . 6 𝑛(∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ)
10 simpr 486 . . . . . . . . . 10 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ 𝑛 ∈ ℕ) → 𝑛 ∈ ℕ)
11 rspa 3246 . . . . . . . . . . 11 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ 𝑛 ∈ ℕ) → 𝐴 ∈ dom vol)
12 volf 25046 . . . . . . . . . . . 12 vol:dom vol⟶(0[,]+∞)
1312ffvelcdmi 7086 . . . . . . . . . . 11 (𝐴 ∈ dom vol → (vol‘𝐴) ∈ (0[,]+∞))
1411, 13syl 17 . . . . . . . . . 10 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ 𝑛 ∈ ℕ) → (vol‘𝐴) ∈ (0[,]+∞))
153fvmpt2 7010 . . . . . . . . . 10 ((𝑛 ∈ ℕ ∧ (vol‘𝐴) ∈ (0[,]+∞)) → ((𝑛 ∈ ℕ ↦ (vol‘𝐴))‘𝑛) = (vol‘𝐴))
1610, 14, 15syl2anc 585 . . . . . . . . 9 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ 𝑛 ∈ ℕ) → ((𝑛 ∈ ℕ ↦ (vol‘𝐴))‘𝑛) = (vol‘𝐴))
1716adantlr 714 . . . . . . . 8 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ) ∧ 𝑛 ∈ ℕ) → ((𝑛 ∈ ℕ ↦ (vol‘𝐴))‘𝑛) = (vol‘𝐴))
1817ex 414 . . . . . . 7 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ) → (𝑛 ∈ ℕ → ((𝑛 ∈ ℕ ↦ (vol‘𝐴))‘𝑛) = (vol‘𝐴)))
199, 18ralrimi 3255 . . . . . 6 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ) → ∀𝑛 ∈ ℕ ((𝑛 ∈ ℕ ↦ (vol‘𝐴))‘𝑛) = (vol‘𝐴))
209, 19esumeq2d 33035 . . . . 5 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ) → Σ*𝑛 ∈ ℕ((𝑛 ∈ ℕ ↦ (vol‘𝐴))‘𝑛) = Σ*𝑛 ∈ ℕ(vol‘𝐴))
21 simpr 486 . . . . . . . . 9 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ) → ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ)
2221r19.21bi 3249 . . . . . . . 8 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ) ∧ 𝑛 ∈ ℕ) → (vol‘𝐴) ∈ ℝ)
2314adantlr 714 . . . . . . . . 9 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ) ∧ 𝑛 ∈ ℕ) → (vol‘𝐴) ∈ (0[,]+∞))
24 0xr 11261 . . . . . . . . . . 11 0 ∈ ℝ*
25 pnfxr 11268 . . . . . . . . . . 11 +∞ ∈ ℝ*
26 elicc1 13368 . . . . . . . . . . 11 ((0 ∈ ℝ* ∧ +∞ ∈ ℝ*) → ((vol‘𝐴) ∈ (0[,]+∞) ↔ ((vol‘𝐴) ∈ ℝ* ∧ 0 ≤ (vol‘𝐴) ∧ (vol‘𝐴) ≤ +∞)))
2724, 25, 26mp2an 691 . . . . . . . . . 10 ((vol‘𝐴) ∈ (0[,]+∞) ↔ ((vol‘𝐴) ∈ ℝ* ∧ 0 ≤ (vol‘𝐴) ∧ (vol‘𝐴) ≤ +∞))
2827simp2bi 1147 . . . . . . . . 9 ((vol‘𝐴) ∈ (0[,]+∞) → 0 ≤ (vol‘𝐴))
2923, 28syl 17 . . . . . . . 8 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ) ∧ 𝑛 ∈ ℕ) → 0 ≤ (vol‘𝐴))
30 ltpnf 13100 . . . . . . . . 9 ((vol‘𝐴) ∈ ℝ → (vol‘𝐴) < +∞)
3122, 30syl 17 . . . . . . . 8 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ) ∧ 𝑛 ∈ ℕ) → (vol‘𝐴) < +∞)
32 0re 11216 . . . . . . . . 9 0 ∈ ℝ
33 elico2 13388 . . . . . . . . 9 ((0 ∈ ℝ ∧ +∞ ∈ ℝ*) → ((vol‘𝐴) ∈ (0[,)+∞) ↔ ((vol‘𝐴) ∈ ℝ ∧ 0 ≤ (vol‘𝐴) ∧ (vol‘𝐴) < +∞)))
3432, 25, 33mp2an 691 . . . . . . . 8 ((vol‘𝐴) ∈ (0[,)+∞) ↔ ((vol‘𝐴) ∈ ℝ ∧ 0 ≤ (vol‘𝐴) ∧ (vol‘𝐴) < +∞))
3522, 29, 31, 34syl3anbrc 1344 . . . . . . 7 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ) ∧ 𝑛 ∈ ℕ) → (vol‘𝐴) ∈ (0[,)+∞))
369, 35, 3fmptdf 7117 . . . . . 6 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ) → (𝑛 ∈ ℕ ↦ (vol‘𝐴)):ℕ⟶(0[,)+∞))
37 nfmpt1 5257 . . . . . . 7 𝑛(𝑛 ∈ ℕ ↦ (vol‘𝐴))
3837esumfsupre 33069 . . . . . 6 ((𝑛 ∈ ℕ ↦ (vol‘𝐴)):ℕ⟶(0[,)+∞) → Σ*𝑛 ∈ ℕ((𝑛 ∈ ℕ ↦ (vol‘𝐴))‘𝑛) = sup(ran seq1( + , (𝑛 ∈ ℕ ↦ (vol‘𝐴))), ℝ*, < ))
3936, 38syl 17 . . . . 5 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ) → Σ*𝑛 ∈ ℕ((𝑛 ∈ ℕ ↦ (vol‘𝐴))‘𝑛) = sup(ran seq1( + , (𝑛 ∈ ℕ ↦ (vol‘𝐴))), ℝ*, < ))
4020, 39eqtr3d 2775 . . . 4 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ) → Σ*𝑛 ∈ ℕ(vol‘𝐴) = sup(ran seq1( + , (𝑛 ∈ ℕ ↦ (vol‘𝐴))), ℝ*, < ))
4140adantlr 714 . . 3 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ) → Σ*𝑛 ∈ ℕ(vol‘𝐴) = sup(ran seq1( + , (𝑛 ∈ ℕ ↦ (vol‘𝐴))), ℝ*, < ))
426, 41eqtr4d 2776 . 2 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ) → (vol‘ 𝑛 ∈ ℕ 𝐴) = Σ*𝑛 ∈ ℕ(vol‘𝐴))
43 simpr 486 . . . . . . . 8 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞) → ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞)
44 nfv 1918 . . . . . . . . 9 𝑘(vol‘𝐴) = +∞
45 nfcv 2904 . . . . . . . . . . 11 𝑛vol
46 nfcsb1v 3919 . . . . . . . . . . 11 𝑛𝑘 / 𝑛𝐴
4745, 46nffv 6902 . . . . . . . . . 10 𝑛(vol‘𝑘 / 𝑛𝐴)
4847nfeq1 2919 . . . . . . . . 9 𝑛(vol‘𝑘 / 𝑛𝐴) = +∞
49 csbeq1a 3908 . . . . . . . . . 10 (𝑛 = 𝑘𝐴 = 𝑘 / 𝑛𝐴)
5049fveqeq2d 6900 . . . . . . . . 9 (𝑛 = 𝑘 → ((vol‘𝐴) = +∞ ↔ (vol‘𝑘 / 𝑛𝐴) = +∞))
5144, 48, 50cbvrexw 3305 . . . . . . . 8 (∃𝑛 ∈ ℕ (vol‘𝐴) = +∞ ↔ ∃𝑘 ∈ ℕ (vol‘𝑘 / 𝑛𝐴) = +∞)
5243, 51sylib 217 . . . . . . 7 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞) → ∃𝑘 ∈ ℕ (vol‘𝑘 / 𝑛𝐴) = +∞)
5346nfel1 2920 . . . . . . . . . . . . 13 𝑛𝑘 / 𝑛𝐴 ∈ dom vol
5449eleq1d 2819 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → (𝐴 ∈ dom vol ↔ 𝑘 / 𝑛𝐴 ∈ dom vol))
5553, 54rspc 3601 . . . . . . . . . . . 12 (𝑘 ∈ ℕ → (∀𝑛 ∈ ℕ 𝐴 ∈ dom vol → 𝑘 / 𝑛𝐴 ∈ dom vol))
5655impcom 409 . . . . . . . . . . 11 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ 𝑘 ∈ ℕ) → 𝑘 / 𝑛𝐴 ∈ dom vol)
57 iunmbl 25070 . . . . . . . . . . . 12 (∀𝑛 ∈ ℕ 𝐴 ∈ dom vol → 𝑛 ∈ ℕ 𝐴 ∈ dom vol)
5857adantr 482 . . . . . . . . . . 11 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ 𝑘 ∈ ℕ) → 𝑛 ∈ ℕ 𝐴 ∈ dom vol)
59 nfcv 2904 . . . . . . . . . . . . 13 𝑛
60 nfcv 2904 . . . . . . . . . . . . 13 𝑛𝑘
6159, 60, 46, 49ssiun2sf 31791 . . . . . . . . . . . 12 (𝑘 ∈ ℕ → 𝑘 / 𝑛𝐴 𝑛 ∈ ℕ 𝐴)
6261adantl 483 . . . . . . . . . . 11 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ 𝑘 ∈ ℕ) → 𝑘 / 𝑛𝐴 𝑛 ∈ ℕ 𝐴)
63 volss 25050 . . . . . . . . . . 11 ((𝑘 / 𝑛𝐴 ∈ dom vol ∧ 𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ 𝑘 / 𝑛𝐴 𝑛 ∈ ℕ 𝐴) → (vol‘𝑘 / 𝑛𝐴) ≤ (vol‘ 𝑛 ∈ ℕ 𝐴))
6456, 58, 62, 63syl3anc 1372 . . . . . . . . . 10 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ 𝑘 ∈ ℕ) → (vol‘𝑘 / 𝑛𝐴) ≤ (vol‘ 𝑛 ∈ ℕ 𝐴))
6564adantlr 714 . . . . . . . . 9 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ 𝑘 ∈ ℕ) → (vol‘𝑘 / 𝑛𝐴) ≤ (vol‘ 𝑛 ∈ ℕ 𝐴))
6665adantlr 714 . . . . . . . 8 ((((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞) ∧ 𝑘 ∈ ℕ) → (vol‘𝑘 / 𝑛𝐴) ≤ (vol‘ 𝑛 ∈ ℕ 𝐴))
6766ralrimiva 3147 . . . . . . 7 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞) → ∀𝑘 ∈ ℕ (vol‘𝑘 / 𝑛𝐴) ≤ (vol‘ 𝑛 ∈ ℕ 𝐴))
68 r19.29r 3117 . . . . . . 7 ((∃𝑘 ∈ ℕ (vol‘𝑘 / 𝑛𝐴) = +∞ ∧ ∀𝑘 ∈ ℕ (vol‘𝑘 / 𝑛𝐴) ≤ (vol‘ 𝑛 ∈ ℕ 𝐴)) → ∃𝑘 ∈ ℕ ((vol‘𝑘 / 𝑛𝐴) = +∞ ∧ (vol‘𝑘 / 𝑛𝐴) ≤ (vol‘ 𝑛 ∈ ℕ 𝐴)))
6952, 67, 68syl2anc 585 . . . . . 6 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞) → ∃𝑘 ∈ ℕ ((vol‘𝑘 / 𝑛𝐴) = +∞ ∧ (vol‘𝑘 / 𝑛𝐴) ≤ (vol‘ 𝑛 ∈ ℕ 𝐴)))
70 breq1 5152 . . . . . . . 8 ((vol‘𝑘 / 𝑛𝐴) = +∞ → ((vol‘𝑘 / 𝑛𝐴) ≤ (vol‘ 𝑛 ∈ ℕ 𝐴) ↔ +∞ ≤ (vol‘ 𝑛 ∈ ℕ 𝐴)))
7170biimpa 478 . . . . . . 7 (((vol‘𝑘 / 𝑛𝐴) = +∞ ∧ (vol‘𝑘 / 𝑛𝐴) ≤ (vol‘ 𝑛 ∈ ℕ 𝐴)) → +∞ ≤ (vol‘ 𝑛 ∈ ℕ 𝐴))
7271reximi 3085 . . . . . 6 (∃𝑘 ∈ ℕ ((vol‘𝑘 / 𝑛𝐴) = +∞ ∧ (vol‘𝑘 / 𝑛𝐴) ≤ (vol‘ 𝑛 ∈ ℕ 𝐴)) → ∃𝑘 ∈ ℕ +∞ ≤ (vol‘ 𝑛 ∈ ℕ 𝐴))
7369, 72syl 17 . . . . 5 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞) → ∃𝑘 ∈ ℕ +∞ ≤ (vol‘ 𝑛 ∈ ℕ 𝐴))
74 1nn 12223 . . . . . 6 1 ∈ ℕ
75 ne0i 4335 . . . . . 6 (1 ∈ ℕ → ℕ ≠ ∅)
76 r19.9rzv 4500 . . . . . 6 (ℕ ≠ ∅ → (+∞ ≤ (vol‘ 𝑛 ∈ ℕ 𝐴) ↔ ∃𝑘 ∈ ℕ +∞ ≤ (vol‘ 𝑛 ∈ ℕ 𝐴)))
7774, 75, 76mp2b 10 . . . . 5 (+∞ ≤ (vol‘ 𝑛 ∈ ℕ 𝐴) ↔ ∃𝑘 ∈ ℕ +∞ ≤ (vol‘ 𝑛 ∈ ℕ 𝐴))
7873, 77sylibr 233 . . . 4 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞) → +∞ ≤ (vol‘ 𝑛 ∈ ℕ 𝐴))
79 iccssxr 13407 . . . . . . . 8 (0[,]+∞) ⊆ ℝ*
8012ffvelcdmi 7086 . . . . . . . 8 ( 𝑛 ∈ ℕ 𝐴 ∈ dom vol → (vol‘ 𝑛 ∈ ℕ 𝐴) ∈ (0[,]+∞))
8179, 80sselid 3981 . . . . . . 7 ( 𝑛 ∈ ℕ 𝐴 ∈ dom vol → (vol‘ 𝑛 ∈ ℕ 𝐴) ∈ ℝ*)
8257, 81syl 17 . . . . . 6 (∀𝑛 ∈ ℕ 𝐴 ∈ dom vol → (vol‘ 𝑛 ∈ ℕ 𝐴) ∈ ℝ*)
8382ad2antrr 725 . . . . 5 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞) → (vol‘ 𝑛 ∈ ℕ 𝐴) ∈ ℝ*)
84 xgepnf 13144 . . . . 5 ((vol‘ 𝑛 ∈ ℕ 𝐴) ∈ ℝ* → (+∞ ≤ (vol‘ 𝑛 ∈ ℕ 𝐴) ↔ (vol‘ 𝑛 ∈ ℕ 𝐴) = +∞))
8583, 84syl 17 . . . 4 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞) → (+∞ ≤ (vol‘ 𝑛 ∈ ℕ 𝐴) ↔ (vol‘ 𝑛 ∈ ℕ 𝐴) = +∞))
8678, 85mpbid 231 . . 3 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞) → (vol‘ 𝑛 ∈ ℕ 𝐴) = +∞)
87 nfdisj1 5128 . . . . . 6 𝑛Disj 𝑛 ∈ ℕ 𝐴
887, 87nfan 1903 . . . . 5 𝑛(∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴)
89 nfre1 3283 . . . . 5 𝑛𝑛 ∈ ℕ (vol‘𝐴) = +∞
9088, 89nfan 1903 . . . 4 𝑛((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞)
91 nnex 12218 . . . . 5 ℕ ∈ V
9291a1i 11 . . . 4 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞) → ℕ ∈ V)
93143ad2antr3 1191 . . . . 5 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ (Disj 𝑛 ∈ ℕ 𝐴 ∧ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞ ∧ 𝑛 ∈ ℕ)) → (vol‘𝐴) ∈ (0[,]+∞))
94933anassrs 1361 . . . 4 ((((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞) ∧ 𝑛 ∈ ℕ) → (vol‘𝐴) ∈ (0[,]+∞))
9590, 92, 94, 43esumpinfval 33071 . . 3 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞) → Σ*𝑛 ∈ ℕ(vol‘𝐴) = +∞)
9686, 95eqtr4d 2776 . 2 (((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) ∧ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞) → (vol‘ 𝑛 ∈ ℕ 𝐴) = Σ*𝑛 ∈ ℕ(vol‘𝐴))
97 exmid 894 . . . . 5 (∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ ∨ ¬ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ)
98 rexnal 3101 . . . . . 6 (∃𝑛 ∈ ℕ ¬ (vol‘𝐴) ∈ ℝ ↔ ¬ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ)
9998orbi2i 912 . . . . 5 ((∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ ∨ ∃𝑛 ∈ ℕ ¬ (vol‘𝐴) ∈ ℝ) ↔ (∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ ∨ ¬ ∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ))
10097, 99mpbir 230 . . . 4 (∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ ∨ ∃𝑛 ∈ ℕ ¬ (vol‘𝐴) ∈ ℝ)
101 r19.29 3115 . . . . . . 7 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ ∃𝑛 ∈ ℕ ¬ (vol‘𝐴) ∈ ℝ) → ∃𝑛 ∈ ℕ (𝐴 ∈ dom vol ∧ ¬ (vol‘𝐴) ∈ ℝ))
102 xrge0nre 13430 . . . . . . . . 9 (((vol‘𝐴) ∈ (0[,]+∞) ∧ ¬ (vol‘𝐴) ∈ ℝ) → (vol‘𝐴) = +∞)
10313, 102sylan 581 . . . . . . . 8 ((𝐴 ∈ dom vol ∧ ¬ (vol‘𝐴) ∈ ℝ) → (vol‘𝐴) = +∞)
104103reximi 3085 . . . . . . 7 (∃𝑛 ∈ ℕ (𝐴 ∈ dom vol ∧ ¬ (vol‘𝐴) ∈ ℝ) → ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞)
105101, 104syl 17 . . . . . 6 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ ∃𝑛 ∈ ℕ ¬ (vol‘𝐴) ∈ ℝ) → ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞)
106105ex 414 . . . . 5 (∀𝑛 ∈ ℕ 𝐴 ∈ dom vol → (∃𝑛 ∈ ℕ ¬ (vol‘𝐴) ∈ ℝ → ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞))
107106orim2d 966 . . . 4 (∀𝑛 ∈ ℕ 𝐴 ∈ dom vol → ((∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ ∨ ∃𝑛 ∈ ℕ ¬ (vol‘𝐴) ∈ ℝ) → (∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ ∨ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞)))
108100, 107mpi 20 . . 3 (∀𝑛 ∈ ℕ 𝐴 ∈ dom vol → (∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ ∨ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞))
109108adantr 482 . 2 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) → (∀𝑛 ∈ ℕ (vol‘𝐴) ∈ ℝ ∨ ∃𝑛 ∈ ℕ (vol‘𝐴) = +∞))
11042, 96, 109mpjaodan 958 1 ((∀𝑛 ∈ ℕ 𝐴 ∈ dom vol ∧ Disj 𝑛 ∈ ℕ 𝐴) → (vol‘ 𝑛 ∈ ℕ 𝐴) = Σ*𝑛 ∈ ℕ(vol‘𝐴))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 205  wa 397  wo 846  w3a 1088   = wceq 1542  wcel 2107  wne 2941  wral 3062  wrex 3071  Vcvv 3475  csb 3894  wss 3949  c0 4323   ciun 4998  Disj wdisj 5114   class class class wbr 5149  cmpt 5232  dom cdm 5677  ran crn 5678  wf 6540  cfv 6544  (class class class)co 7409  supcsup 9435  cr 11109  0cc0 11110  1c1 11111   + caddc 11113  +∞cpnf 11245  *cxr 11247   < clt 11248  cle 11249  cn 12212  [,)cico 13326  [,]cicc 13327  seqcseq 13966  volcvol 24980  Σ*cesum 33025
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2155  ax-12 2172  ax-ext 2704  ax-rep 5286  ax-sep 5300  ax-nul 5307  ax-pow 5364  ax-pr 5428  ax-un 7725  ax-inf2 9636  ax-cc 10430  ax-cnex 11166  ax-resscn 11167  ax-1cn 11168  ax-icn 11169  ax-addcl 11170  ax-addrcl 11171  ax-mulcl 11172  ax-mulrcl 11173  ax-mulcom 11174  ax-addass 11175  ax-mulass 11176  ax-distr 11177  ax-i2m1 11178  ax-1ne0 11179  ax-1rid 11180  ax-rnegex 11181  ax-rrecex 11182  ax-cnre 11183  ax-pre-lttri 11184  ax-pre-lttrn 11185  ax-pre-ltadd 11186  ax-pre-mulgt0 11187  ax-pre-sup 11188  ax-addf 11189  ax-mulf 11190
This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  df-3or 1089  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1783  df-nf 1787  df-sb 2069  df-mo 2535  df-eu 2564  df-clab 2711  df-cleq 2725  df-clel 2811  df-nfc 2886  df-ne 2942  df-nel 3048  df-ral 3063  df-rex 3072  df-rmo 3377  df-reu 3378  df-rab 3434  df-v 3477  df-sbc 3779  df-csb 3895  df-dif 3952  df-un 3954  df-in 3956  df-ss 3966  df-pss 3968  df-nul 4324  df-if 4530  df-pw 4605  df-sn 4630  df-pr 4632  df-tp 4634  df-op 4636  df-uni 4910  df-int 4952  df-iun 5000  df-iin 5001  df-disj 5115  df-br 5150  df-opab 5212  df-mpt 5233  df-tr 5267  df-id 5575  df-eprel 5581  df-po 5589  df-so 5590  df-fr 5632  df-se 5633  df-we 5634  df-xp 5683  df-rel 5684  df-cnv 5685  df-co 5686  df-dm 5687  df-rn 5688  df-res 5689  df-ima 5690  df-pred 6301  df-ord 6368  df-on 6369  df-lim 6370  df-suc 6371  df-iota 6496  df-fun 6546  df-fn 6547  df-f 6548  df-f1 6549  df-fo 6550  df-f1o 6551  df-fv 6552  df-isom 6553  df-riota 7365  df-ov 7412  df-oprab 7413  df-mpo 7414  df-of 7670  df-om 7856  df-1st 7975  df-2nd 7976  df-supp 8147  df-frecs 8266  df-wrecs 8297  df-recs 8371  df-rdg 8410  df-1o 8466  df-2o 8467  df-oadd 8470  df-er 8703  df-map 8822  df-pm 8823  df-ixp 8892  df-en 8940  df-dom 8941  df-sdom 8942  df-fin 8943  df-fsupp 9362  df-fi 9406  df-sup 9437  df-inf 9438  df-oi 9505  df-dju 9896  df-card 9934  df-pnf 11250  df-mnf 11251  df-xr 11252  df-ltxr 11253  df-le 11254  df-sub 11446  df-neg 11447  df-div 11872  df-nn 12213  df-2 12275  df-3 12276  df-4 12277  df-5 12278  df-6 12279  df-7 12280  df-8 12281  df-9 12282  df-n0 12473  df-xnn0 12545  df-z 12559  df-dec 12678  df-uz 12823  df-q 12933  df-rp 12975  df-xneg 13092  df-xadd 13093  df-xmul 13094  df-ioo 13328  df-ioc 13329  df-ico 13330  df-icc 13331  df-fz 13485  df-fzo 13628  df-fl 13757  df-mod 13835  df-seq 13967  df-exp 14028  df-fac 14234  df-bc 14263  df-hash 14291  df-shft 15014  df-cj 15046  df-re 15047  df-im 15048  df-sqrt 15182  df-abs 15183  df-limsup 15415  df-clim 15432  df-rlim 15433  df-sum 15633  df-ef 16011  df-sin 16013  df-cos 16014  df-pi 16016  df-struct 17080  df-sets 17097  df-slot 17115  df-ndx 17127  df-base 17145  df-ress 17174  df-plusg 17210  df-mulr 17211  df-starv 17212  df-sca 17213  df-vsca 17214  df-ip 17215  df-tset 17216  df-ple 17217  df-ds 17219  df-unif 17220  df-hom 17221  df-cco 17222  df-rest 17368  df-topn 17369  df-0g 17387  df-gsum 17388  df-topgen 17389  df-pt 17390  df-prds 17393  df-ordt 17447  df-xrs 17448  df-qtop 17453  df-imas 17454  df-xps 17456  df-mre 17530  df-mrc 17531  df-acs 17533  df-ps 18519  df-tsr 18520  df-plusf 18560  df-mgm 18561  df-sgrp 18610  df-mnd 18626  df-mhm 18671  df-submnd 18672  df-grp 18822  df-minusg 18823  df-sbg 18824  df-mulg 18951  df-subg 19003  df-cntz 19181  df-cmn 19650  df-abl 19651  df-mgp 19988  df-ur 20005  df-ring 20058  df-cring 20059  df-subrg 20317  df-abv 20425  df-lmod 20473  df-scaf 20474  df-sra 20785  df-rgmod 20786  df-psmet 20936  df-xmet 20937  df-met 20938  df-bl 20939  df-mopn 20940  df-fbas 20941  df-fg 20942  df-cnfld 20945  df-top 22396  df-topon 22413  df-topsp 22435  df-bases 22449  df-cld 22523  df-ntr 22524  df-cls 22525  df-nei 22602  df-lp 22640  df-perf 22641  df-cn 22731  df-cnp 22732  df-haus 22819  df-tx 23066  df-hmeo 23259  df-fil 23350  df-fm 23442  df-flim 23443  df-flf 23444  df-tmd 23576  df-tgp 23577  df-tsms 23631  df-trg 23664  df-xms 23826  df-ms 23827  df-tms 23828  df-nm 24091  df-ngp 24092  df-nrg 24094  df-nlm 24095  df-ii 24393  df-cncf 24394  df-ovol 24981  df-vol 24982  df-limc 25383  df-dv 25384  df-log 26065  df-esum 33026
This theorem is referenced by:  volmeas  33229
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