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Theorem ovoliun 23319
Description: The Lebesgue outer measure function is countably sub-additive. (Many books allow +∞ as a value for one of the sets in the sum, but in our setup we can't do arithmetic on infinity, and in any case the volume of a union containing an infinitely large set is already infinitely large by monotonicity ovolss 23299, so we need not consider this case here, although we do allow the sum itself to be infinite.) (Contributed by Mario Carneiro, 12-Jun-2014.)
Hypotheses
Ref Expression
ovoliun.t 𝑇 = seq1( + , 𝐺)
ovoliun.g 𝐺 = (𝑛 ∈ ℕ ↦ (vol*‘𝐴))
ovoliun.a ((𝜑𝑛 ∈ ℕ) → 𝐴 ⊆ ℝ)
ovoliun.v ((𝜑𝑛 ∈ ℕ) → (vol*‘𝐴) ∈ ℝ)
Assertion
Ref Expression
ovoliun (𝜑 → (vol*‘ 𝑛 ∈ ℕ 𝐴) ≤ sup(ran 𝑇, ℝ*, < ))
Distinct variable group:   𝜑,𝑛
Allowed substitution hints:   𝐴(𝑛)   𝑇(𝑛)   𝐺(𝑛)

Proof of Theorem ovoliun
Dummy variables 𝑘 𝑚 𝑥 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 nnuz 11761 . . . . . . . . . 10 ℕ = (ℤ‘1)
2 1zzd 11446 . . . . . . . . . 10 (𝜑 → 1 ∈ ℤ)
3 ovoliun.v . . . . . . . . . . . 12 ((𝜑𝑛 ∈ ℕ) → (vol*‘𝐴) ∈ ℝ)
4 ovoliun.g . . . . . . . . . . . 12 𝐺 = (𝑛 ∈ ℕ ↦ (vol*‘𝐴))
53, 4fmptd 6425 . . . . . . . . . . 11 (𝜑𝐺:ℕ⟶ℝ)
65ffvelrnda 6399 . . . . . . . . . 10 ((𝜑𝑘 ∈ ℕ) → (𝐺𝑘) ∈ ℝ)
71, 2, 6serfre 12870 . . . . . . . . 9 (𝜑 → seq1( + , 𝐺):ℕ⟶ℝ)
8 ovoliun.t . . . . . . . . . 10 𝑇 = seq1( + , 𝐺)
98feq1i 6074 . . . . . . . . 9 (𝑇:ℕ⟶ℝ ↔ seq1( + , 𝐺):ℕ⟶ℝ)
107, 9sylibr 224 . . . . . . . 8 (𝜑𝑇:ℕ⟶ℝ)
11 frn 6091 . . . . . . . 8 (𝑇:ℕ⟶ℝ → ran 𝑇 ⊆ ℝ)
1210, 11syl 17 . . . . . . 7 (𝜑 → ran 𝑇 ⊆ ℝ)
13 ressxr 10121 . . . . . . 7 ℝ ⊆ ℝ*
1412, 13syl6ss 3648 . . . . . 6 (𝜑 → ran 𝑇 ⊆ ℝ*)
15 supxrcl 12183 . . . . . 6 (ran 𝑇 ⊆ ℝ* → sup(ran 𝑇, ℝ*, < ) ∈ ℝ*)
1614, 15syl 17 . . . . 5 (𝜑 → sup(ran 𝑇, ℝ*, < ) ∈ ℝ*)
17 xrrebnd 12037 . . . . 5 (sup(ran 𝑇, ℝ*, < ) ∈ ℝ* → (sup(ran 𝑇, ℝ*, < ) ∈ ℝ ↔ (-∞ < sup(ran 𝑇, ℝ*, < ) ∧ sup(ran 𝑇, ℝ*, < ) < +∞)))
1816, 17syl 17 . . . 4 (𝜑 → (sup(ran 𝑇, ℝ*, < ) ∈ ℝ ↔ (-∞ < sup(ran 𝑇, ℝ*, < ) ∧ sup(ran 𝑇, ℝ*, < ) < +∞)))
19 mnfxr 10134 . . . . . . 7 -∞ ∈ ℝ*
2019a1i 11 . . . . . 6 (𝜑 → -∞ ∈ ℝ*)
21 1nn 11069 . . . . . . . 8 1 ∈ ℕ
22 ffvelrn 6397 . . . . . . . 8 ((𝑇:ℕ⟶ℝ ∧ 1 ∈ ℕ) → (𝑇‘1) ∈ ℝ)
2310, 21, 22sylancl 695 . . . . . . 7 (𝜑 → (𝑇‘1) ∈ ℝ)
2423rexrd 10127 . . . . . 6 (𝜑 → (𝑇‘1) ∈ ℝ*)
25 mnflt 11995 . . . . . . 7 ((𝑇‘1) ∈ ℝ → -∞ < (𝑇‘1))
2623, 25syl 17 . . . . . 6 (𝜑 → -∞ < (𝑇‘1))
27 ffn 6083 . . . . . . . . 9 (𝑇:ℕ⟶ℝ → 𝑇 Fn ℕ)
2810, 27syl 17 . . . . . . . 8 (𝜑𝑇 Fn ℕ)
29 fnfvelrn 6396 . . . . . . . 8 ((𝑇 Fn ℕ ∧ 1 ∈ ℕ) → (𝑇‘1) ∈ ran 𝑇)
3028, 21, 29sylancl 695 . . . . . . 7 (𝜑 → (𝑇‘1) ∈ ran 𝑇)
31 supxrub 12192 . . . . . . 7 ((ran 𝑇 ⊆ ℝ* ∧ (𝑇‘1) ∈ ran 𝑇) → (𝑇‘1) ≤ sup(ran 𝑇, ℝ*, < ))
3214, 30, 31syl2anc 694 . . . . . 6 (𝜑 → (𝑇‘1) ≤ sup(ran 𝑇, ℝ*, < ))
3320, 24, 16, 26, 32xrltletrd 12030 . . . . 5 (𝜑 → -∞ < sup(ran 𝑇, ℝ*, < ))
3433biantrurd 528 . . . 4 (𝜑 → (sup(ran 𝑇, ℝ*, < ) < +∞ ↔ (-∞ < sup(ran 𝑇, ℝ*, < ) ∧ sup(ran 𝑇, ℝ*, < ) < +∞)))
3518, 34bitr4d 271 . . 3 (𝜑 → (sup(ran 𝑇, ℝ*, < ) ∈ ℝ ↔ sup(ran 𝑇, ℝ*, < ) < +∞))
36 nfcv 2793 . . . . . . . . 9 𝑚𝐴
37 nfcsb1v 3582 . . . . . . . . 9 𝑛𝑚 / 𝑛𝐴
38 csbeq1a 3575 . . . . . . . . 9 (𝑛 = 𝑚𝐴 = 𝑚 / 𝑛𝐴)
3936, 37, 38cbviun 4589 . . . . . . . 8 𝑛 ∈ ℕ 𝐴 = 𝑚 ∈ ℕ 𝑚 / 𝑛𝐴
4039fveq2i 6232 . . . . . . 7 (vol*‘ 𝑛 ∈ ℕ 𝐴) = (vol*‘ 𝑚 ∈ ℕ 𝑚 / 𝑛𝐴)
41 nfcv 2793 . . . . . . . . . 10 𝑚(vol*‘𝐴)
42 nfcv 2793 . . . . . . . . . . 11 𝑛vol*
4342, 37nffv 6236 . . . . . . . . . 10 𝑛(vol*‘𝑚 / 𝑛𝐴)
4438fveq2d 6233 . . . . . . . . . 10 (𝑛 = 𝑚 → (vol*‘𝐴) = (vol*‘𝑚 / 𝑛𝐴))
4541, 43, 44cbvmpt 4782 . . . . . . . . 9 (𝑛 ∈ ℕ ↦ (vol*‘𝐴)) = (𝑚 ∈ ℕ ↦ (vol*‘𝑚 / 𝑛𝐴))
464, 45eqtri 2673 . . . . . . . 8 𝐺 = (𝑚 ∈ ℕ ↦ (vol*‘𝑚 / 𝑛𝐴))
47 ovoliun.a . . . . . . . . . . . 12 ((𝜑𝑛 ∈ ℕ) → 𝐴 ⊆ ℝ)
4847ralrimiva 2995 . . . . . . . . . . 11 (𝜑 → ∀𝑛 ∈ ℕ 𝐴 ⊆ ℝ)
49 nfv 1883 . . . . . . . . . . . 12 𝑚 𝐴 ⊆ ℝ
50 nfcv 2793 . . . . . . . . . . . . 13 𝑛
5137, 50nfss 3629 . . . . . . . . . . . 12 𝑛𝑚 / 𝑛𝐴 ⊆ ℝ
5238sseq1d 3665 . . . . . . . . . . . 12 (𝑛 = 𝑚 → (𝐴 ⊆ ℝ ↔ 𝑚 / 𝑛𝐴 ⊆ ℝ))
5349, 51, 52cbvral 3197 . . . . . . . . . . 11 (∀𝑛 ∈ ℕ 𝐴 ⊆ ℝ ↔ ∀𝑚 ∈ ℕ 𝑚 / 𝑛𝐴 ⊆ ℝ)
5448, 53sylib 208 . . . . . . . . . 10 (𝜑 → ∀𝑚 ∈ ℕ 𝑚 / 𝑛𝐴 ⊆ ℝ)
5554ad2antrr 762 . . . . . . . . 9 (((𝜑 ∧ sup(ran 𝑇, ℝ*, < ) ∈ ℝ) ∧ 𝑥 ∈ ℝ+) → ∀𝑚 ∈ ℕ 𝑚 / 𝑛𝐴 ⊆ ℝ)
5655r19.21bi 2961 . . . . . . . 8 ((((𝜑 ∧ sup(ran 𝑇, ℝ*, < ) ∈ ℝ) ∧ 𝑥 ∈ ℝ+) ∧ 𝑚 ∈ ℕ) → 𝑚 / 𝑛𝐴 ⊆ ℝ)
573ralrimiva 2995 . . . . . . . . . . 11 (𝜑 → ∀𝑛 ∈ ℕ (vol*‘𝐴) ∈ ℝ)
5841nfel1 2808 . . . . . . . . . . . 12 𝑚(vol*‘𝐴) ∈ ℝ
5943nfel1 2808 . . . . . . . . . . . 12 𝑛(vol*‘𝑚 / 𝑛𝐴) ∈ ℝ
6044eleq1d 2715 . . . . . . . . . . . 12 (𝑛 = 𝑚 → ((vol*‘𝐴) ∈ ℝ ↔ (vol*‘𝑚 / 𝑛𝐴) ∈ ℝ))
6158, 59, 60cbvral 3197 . . . . . . . . . . 11 (∀𝑛 ∈ ℕ (vol*‘𝐴) ∈ ℝ ↔ ∀𝑚 ∈ ℕ (vol*‘𝑚 / 𝑛𝐴) ∈ ℝ)
6257, 61sylib 208 . . . . . . . . . 10 (𝜑 → ∀𝑚 ∈ ℕ (vol*‘𝑚 / 𝑛𝐴) ∈ ℝ)
6362ad2antrr 762 . . . . . . . . 9 (((𝜑 ∧ sup(ran 𝑇, ℝ*, < ) ∈ ℝ) ∧ 𝑥 ∈ ℝ+) → ∀𝑚 ∈ ℕ (vol*‘𝑚 / 𝑛𝐴) ∈ ℝ)
6463r19.21bi 2961 . . . . . . . 8 ((((𝜑 ∧ sup(ran 𝑇, ℝ*, < ) ∈ ℝ) ∧ 𝑥 ∈ ℝ+) ∧ 𝑚 ∈ ℕ) → (vol*‘𝑚 / 𝑛𝐴) ∈ ℝ)
65 simplr 807 . . . . . . . 8 (((𝜑 ∧ sup(ran 𝑇, ℝ*, < ) ∈ ℝ) ∧ 𝑥 ∈ ℝ+) → sup(ran 𝑇, ℝ*, < ) ∈ ℝ)
66 simpr 476 . . . . . . . 8 (((𝜑 ∧ sup(ran 𝑇, ℝ*, < ) ∈ ℝ) ∧ 𝑥 ∈ ℝ+) → 𝑥 ∈ ℝ+)
678, 46, 56, 64, 65, 66ovoliunlem3 23318 . . . . . . 7 (((𝜑 ∧ sup(ran 𝑇, ℝ*, < ) ∈ ℝ) ∧ 𝑥 ∈ ℝ+) → (vol*‘ 𝑚 ∈ ℕ 𝑚 / 𝑛𝐴) ≤ (sup(ran 𝑇, ℝ*, < ) + 𝑥))
6840, 67syl5eqbr 4720 . . . . . 6 (((𝜑 ∧ sup(ran 𝑇, ℝ*, < ) ∈ ℝ) ∧ 𝑥 ∈ ℝ+) → (vol*‘ 𝑛 ∈ ℕ 𝐴) ≤ (sup(ran 𝑇, ℝ*, < ) + 𝑥))
6968ralrimiva 2995 . . . . 5 ((𝜑 ∧ sup(ran 𝑇, ℝ*, < ) ∈ ℝ) → ∀𝑥 ∈ ℝ+ (vol*‘ 𝑛 ∈ ℕ 𝐴) ≤ (sup(ran 𝑇, ℝ*, < ) + 𝑥))
70 iunss 4593 . . . . . . . 8 ( 𝑛 ∈ ℕ 𝐴 ⊆ ℝ ↔ ∀𝑛 ∈ ℕ 𝐴 ⊆ ℝ)
7148, 70sylibr 224 . . . . . . 7 (𝜑 𝑛 ∈ ℕ 𝐴 ⊆ ℝ)
72 ovolcl 23292 . . . . . . 7 ( 𝑛 ∈ ℕ 𝐴 ⊆ ℝ → (vol*‘ 𝑛 ∈ ℕ 𝐴) ∈ ℝ*)
7371, 72syl 17 . . . . . 6 (𝜑 → (vol*‘ 𝑛 ∈ ℕ 𝐴) ∈ ℝ*)
74 xralrple 12074 . . . . . 6 (((vol*‘ 𝑛 ∈ ℕ 𝐴) ∈ ℝ* ∧ sup(ran 𝑇, ℝ*, < ) ∈ ℝ) → ((vol*‘ 𝑛 ∈ ℕ 𝐴) ≤ sup(ran 𝑇, ℝ*, < ) ↔ ∀𝑥 ∈ ℝ+ (vol*‘ 𝑛 ∈ ℕ 𝐴) ≤ (sup(ran 𝑇, ℝ*, < ) + 𝑥)))
7573, 74sylan 487 . . . . 5 ((𝜑 ∧ sup(ran 𝑇, ℝ*, < ) ∈ ℝ) → ((vol*‘ 𝑛 ∈ ℕ 𝐴) ≤ sup(ran 𝑇, ℝ*, < ) ↔ ∀𝑥 ∈ ℝ+ (vol*‘ 𝑛 ∈ ℕ 𝐴) ≤ (sup(ran 𝑇, ℝ*, < ) + 𝑥)))
7669, 75mpbird 247 . . . 4 ((𝜑 ∧ sup(ran 𝑇, ℝ*, < ) ∈ ℝ) → (vol*‘ 𝑛 ∈ ℕ 𝐴) ≤ sup(ran 𝑇, ℝ*, < ))
7776ex 449 . . 3 (𝜑 → (sup(ran 𝑇, ℝ*, < ) ∈ ℝ → (vol*‘ 𝑛 ∈ ℕ 𝐴) ≤ sup(ran 𝑇, ℝ*, < )))
7835, 77sylbird 250 . 2 (𝜑 → (sup(ran 𝑇, ℝ*, < ) < +∞ → (vol*‘ 𝑛 ∈ ℕ 𝐴) ≤ sup(ran 𝑇, ℝ*, < )))
79 nltpnft 12033 . . . 4 (sup(ran 𝑇, ℝ*, < ) ∈ ℝ* → (sup(ran 𝑇, ℝ*, < ) = +∞ ↔ ¬ sup(ran 𝑇, ℝ*, < ) < +∞))
8016, 79syl 17 . . 3 (𝜑 → (sup(ran 𝑇, ℝ*, < ) = +∞ ↔ ¬ sup(ran 𝑇, ℝ*, < ) < +∞))
81 pnfge 12002 . . . . 5 ((vol*‘ 𝑛 ∈ ℕ 𝐴) ∈ ℝ* → (vol*‘ 𝑛 ∈ ℕ 𝐴) ≤ +∞)
8273, 81syl 17 . . . 4 (𝜑 → (vol*‘ 𝑛 ∈ ℕ 𝐴) ≤ +∞)
83 breq2 4689 . . . 4 (sup(ran 𝑇, ℝ*, < ) = +∞ → ((vol*‘ 𝑛 ∈ ℕ 𝐴) ≤ sup(ran 𝑇, ℝ*, < ) ↔ (vol*‘ 𝑛 ∈ ℕ 𝐴) ≤ +∞))
8482, 83syl5ibrcom 237 . . 3 (𝜑 → (sup(ran 𝑇, ℝ*, < ) = +∞ → (vol*‘ 𝑛 ∈ ℕ 𝐴) ≤ sup(ran 𝑇, ℝ*, < )))
8580, 84sylbird 250 . 2 (𝜑 → (¬ sup(ran 𝑇, ℝ*, < ) < +∞ → (vol*‘ 𝑛 ∈ ℕ 𝐴) ≤ sup(ran 𝑇, ℝ*, < )))
8678, 85pm2.61d 170 1 (𝜑 → (vol*‘ 𝑛 ∈ ℕ 𝐴) ≤ sup(ran 𝑇, ℝ*, < ))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 196  wa 383   = wceq 1523  wcel 2030  wral 2941  csb 3566  wss 3607   ciun 4552   class class class wbr 4685  cmpt 4762  ran crn 5144   Fn wfn 5921  wf 5922  cfv 5926  (class class class)co 6690  supcsup 8387  cr 9973  1c1 9975   + caddc 9977  +∞cpnf 10109  -∞cmnf 10110  *cxr 10111   < clt 10112  cle 10113  cn 11058  +crp 11870  seqcseq 12841  vol*covol 23277
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-cc 9295  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-om 7108  df-1st 7210  df-2nd 7211  df-wrecs 7452  df-recs 7513  df-rdg 7551  df-1o 7605  df-oadd 7609  df-er 7787  df-map 7901  df-pm 7902  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-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-ioo 12217  df-ico 12219  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-rlim 14264  df-sum 14461  df-ovol 23279
This theorem is referenced by:  ovoliun2  23320  voliunlem2  23365  voliunlem3  23366  ex-ovoliunnfl  33582
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