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Theorem ovolsplit 45002
Description: The Lebesgue outer measure function is finitely sub-additive: application to a set split in two parts, using addition for extended reals. (Contributed by Glauco Siliprandi, 3-Mar-2021.)
Hypothesis
Ref Expression
ovolsplit.1 (𝜑𝐴 ⊆ ℝ)
Assertion
Ref Expression
ovolsplit (𝜑 → (vol*‘𝐴) ≤ ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))))

Proof of Theorem ovolsplit
StepHypRef Expression
1 inundif 4477 . . . . 5 ((𝐴𝐵) ∪ (𝐴𝐵)) = 𝐴
21eqcomi 2739 . . . 4 𝐴 = ((𝐴𝐵) ∪ (𝐴𝐵))
32a1i 11 . . 3 (𝜑𝐴 = ((𝐴𝐵) ∪ (𝐴𝐵)))
43fveq2d 6894 . 2 (𝜑 → (vol*‘𝐴) = (vol*‘((𝐴𝐵) ∪ (𝐴𝐵))))
5 ovolsplit.1 . . . . . . . . 9 (𝜑𝐴 ⊆ ℝ)
65ssinss1d 44036 . . . . . . . 8 (𝜑 → (𝐴𝐵) ⊆ ℝ)
75ssdifssd 4141 . . . . . . . 8 (𝜑 → (𝐴𝐵) ⊆ ℝ)
86, 7unssd 4185 . . . . . . 7 (𝜑 → ((𝐴𝐵) ∪ (𝐴𝐵)) ⊆ ℝ)
9 ovolcl 25227 . . . . . . 7 (((𝐴𝐵) ∪ (𝐴𝐵)) ⊆ ℝ → (vol*‘((𝐴𝐵) ∪ (𝐴𝐵))) ∈ ℝ*)
108, 9syl 17 . . . . . 6 (𝜑 → (vol*‘((𝐴𝐵) ∪ (𝐴𝐵))) ∈ ℝ*)
11 pnfge 13114 . . . . . 6 ((vol*‘((𝐴𝐵) ∪ (𝐴𝐵))) ∈ ℝ* → (vol*‘((𝐴𝐵) ∪ (𝐴𝐵))) ≤ +∞)
1210, 11syl 17 . . . . 5 (𝜑 → (vol*‘((𝐴𝐵) ∪ (𝐴𝐵))) ≤ +∞)
1312adantr 479 . . . 4 ((𝜑 ∧ (vol*‘(𝐴𝐵)) = +∞) → (vol*‘((𝐴𝐵) ∪ (𝐴𝐵))) ≤ +∞)
14 oveq1 7418 . . . . . 6 ((vol*‘(𝐴𝐵)) = +∞ → ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))) = (+∞ +𝑒 (vol*‘(𝐴𝐵))))
1514adantl 480 . . . . 5 ((𝜑 ∧ (vol*‘(𝐴𝐵)) = +∞) → ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))) = (+∞ +𝑒 (vol*‘(𝐴𝐵))))
16 ovolcl 25227 . . . . . . . 8 ((𝐴𝐵) ⊆ ℝ → (vol*‘(𝐴𝐵)) ∈ ℝ*)
177, 16syl 17 . . . . . . 7 (𝜑 → (vol*‘(𝐴𝐵)) ∈ ℝ*)
1817adantr 479 . . . . . 6 ((𝜑 ∧ (vol*‘(𝐴𝐵)) = +∞) → (vol*‘(𝐴𝐵)) ∈ ℝ*)
19 reex 11203 . . . . . . . . . . . . . 14 ℝ ∈ V
2019a1i 11 . . . . . . . . . . . . 13 (𝜑 → ℝ ∈ V)
2120, 5ssexd 5323 . . . . . . . . . . . 12 (𝜑𝐴 ∈ V)
2221difexd 5328 . . . . . . . . . . 11 (𝜑 → (𝐴𝐵) ∈ V)
23 elpwg 4604 . . . . . . . . . . 11 ((𝐴𝐵) ∈ V → ((𝐴𝐵) ∈ 𝒫 ℝ ↔ (𝐴𝐵) ⊆ ℝ))
2422, 23syl 17 . . . . . . . . . 10 (𝜑 → ((𝐴𝐵) ∈ 𝒫 ℝ ↔ (𝐴𝐵) ⊆ ℝ))
257, 24mpbird 256 . . . . . . . . 9 (𝜑 → (𝐴𝐵) ∈ 𝒫 ℝ)
26 ovolf 25231 . . . . . . . . . 10 vol*:𝒫 ℝ⟶(0[,]+∞)
2726ffvelcdmi 7084 . . . . . . . . 9 ((𝐴𝐵) ∈ 𝒫 ℝ → (vol*‘(𝐴𝐵)) ∈ (0[,]+∞))
2825, 27syl 17 . . . . . . . 8 (𝜑 → (vol*‘(𝐴𝐵)) ∈ (0[,]+∞))
2928xrge0nemnfd 44340 . . . . . . 7 (𝜑 → (vol*‘(𝐴𝐵)) ≠ -∞)
3029adantr 479 . . . . . 6 ((𝜑 ∧ (vol*‘(𝐴𝐵)) = +∞) → (vol*‘(𝐴𝐵)) ≠ -∞)
31 xaddpnf2 13210 . . . . . 6 (((vol*‘(𝐴𝐵)) ∈ ℝ* ∧ (vol*‘(𝐴𝐵)) ≠ -∞) → (+∞ +𝑒 (vol*‘(𝐴𝐵))) = +∞)
3218, 30, 31syl2anc 582 . . . . 5 ((𝜑 ∧ (vol*‘(𝐴𝐵)) = +∞) → (+∞ +𝑒 (vol*‘(𝐴𝐵))) = +∞)
3315, 32eqtr2d 2771 . . . 4 ((𝜑 ∧ (vol*‘(𝐴𝐵)) = +∞) → +∞ = ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))))
3413, 33breqtrd 5173 . . 3 ((𝜑 ∧ (vol*‘(𝐴𝐵)) = +∞) → (vol*‘((𝐴𝐵) ∪ (𝐴𝐵))) ≤ ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))))
35 simpl 481 . . . 4 ((𝜑 ∧ ¬ (vol*‘(𝐴𝐵)) = +∞) → 𝜑)
3620, 6sselpwd 5325 . . . . . . 7 (𝜑 → (𝐴𝐵) ∈ 𝒫 ℝ)
3726ffvelcdmi 7084 . . . . . . 7 ((𝐴𝐵) ∈ 𝒫 ℝ → (vol*‘(𝐴𝐵)) ∈ (0[,]+∞))
3836, 37syl 17 . . . . . 6 (𝜑 → (vol*‘(𝐴𝐵)) ∈ (0[,]+∞))
3938adantr 479 . . . . 5 ((𝜑 ∧ ¬ (vol*‘(𝐴𝐵)) = +∞) → (vol*‘(𝐴𝐵)) ∈ (0[,]+∞))
40 neqne 2946 . . . . . 6 (¬ (vol*‘(𝐴𝐵)) = +∞ → (vol*‘(𝐴𝐵)) ≠ +∞)
4140adantl 480 . . . . 5 ((𝜑 ∧ ¬ (vol*‘(𝐴𝐵)) = +∞) → (vol*‘(𝐴𝐵)) ≠ +∞)
42 ge0xrre 44542 . . . . 5 (((vol*‘(𝐴𝐵)) ∈ (0[,]+∞) ∧ (vol*‘(𝐴𝐵)) ≠ +∞) → (vol*‘(𝐴𝐵)) ∈ ℝ)
4339, 41, 42syl2anc 582 . . . 4 ((𝜑 ∧ ¬ (vol*‘(𝐴𝐵)) = +∞) → (vol*‘(𝐴𝐵)) ∈ ℝ)
4412adantr 479 . . . . . . 7 ((𝜑 ∧ (vol*‘(𝐴𝐵)) = +∞) → (vol*‘((𝐴𝐵) ∪ (𝐴𝐵))) ≤ +∞)
45 oveq2 7419 . . . . . . . . 9 ((vol*‘(𝐴𝐵)) = +∞ → ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))) = ((vol*‘(𝐴𝐵)) +𝑒 +∞))
4645adantl 480 . . . . . . . 8 ((𝜑 ∧ (vol*‘(𝐴𝐵)) = +∞) → ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))) = ((vol*‘(𝐴𝐵)) +𝑒 +∞))
47 ovolcl 25227 . . . . . . . . . . 11 ((𝐴𝐵) ⊆ ℝ → (vol*‘(𝐴𝐵)) ∈ ℝ*)
486, 47syl 17 . . . . . . . . . 10 (𝜑 → (vol*‘(𝐴𝐵)) ∈ ℝ*)
4938xrge0nemnfd 44340 . . . . . . . . . 10 (𝜑 → (vol*‘(𝐴𝐵)) ≠ -∞)
50 xaddpnf1 13209 . . . . . . . . . 10 (((vol*‘(𝐴𝐵)) ∈ ℝ* ∧ (vol*‘(𝐴𝐵)) ≠ -∞) → ((vol*‘(𝐴𝐵)) +𝑒 +∞) = +∞)
5148, 49, 50syl2anc 582 . . . . . . . . 9 (𝜑 → ((vol*‘(𝐴𝐵)) +𝑒 +∞) = +∞)
5251adantr 479 . . . . . . . 8 ((𝜑 ∧ (vol*‘(𝐴𝐵)) = +∞) → ((vol*‘(𝐴𝐵)) +𝑒 +∞) = +∞)
5346, 52eqtr2d 2771 . . . . . . 7 ((𝜑 ∧ (vol*‘(𝐴𝐵)) = +∞) → +∞ = ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))))
5444, 53breqtrd 5173 . . . . . 6 ((𝜑 ∧ (vol*‘(𝐴𝐵)) = +∞) → (vol*‘((𝐴𝐵) ∪ (𝐴𝐵))) ≤ ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))))
5554adantlr 711 . . . . 5 (((𝜑 ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) ∧ (vol*‘(𝐴𝐵)) = +∞) → (vol*‘((𝐴𝐵) ∪ (𝐴𝐵))) ≤ ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))))
56 simpll 763 . . . . . 6 (((𝜑 ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) ∧ ¬ (vol*‘(𝐴𝐵)) = +∞) → 𝜑)
57 simplr 765 . . . . . 6 (((𝜑 ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) ∧ ¬ (vol*‘(𝐴𝐵)) = +∞) → (vol*‘(𝐴𝐵)) ∈ ℝ)
5828adantr 479 . . . . . . . 8 ((𝜑 ∧ ¬ (vol*‘(𝐴𝐵)) = +∞) → (vol*‘(𝐴𝐵)) ∈ (0[,]+∞))
59 neqne 2946 . . . . . . . . 9 (¬ (vol*‘(𝐴𝐵)) = +∞ → (vol*‘(𝐴𝐵)) ≠ +∞)
6059adantl 480 . . . . . . . 8 ((𝜑 ∧ ¬ (vol*‘(𝐴𝐵)) = +∞) → (vol*‘(𝐴𝐵)) ≠ +∞)
61 ge0xrre 44542 . . . . . . . 8 (((vol*‘(𝐴𝐵)) ∈ (0[,]+∞) ∧ (vol*‘(𝐴𝐵)) ≠ +∞) → (vol*‘(𝐴𝐵)) ∈ ℝ)
6258, 60, 61syl2anc 582 . . . . . . 7 ((𝜑 ∧ ¬ (vol*‘(𝐴𝐵)) = +∞) → (vol*‘(𝐴𝐵)) ∈ ℝ)
6362adantlr 711 . . . . . 6 (((𝜑 ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) ∧ ¬ (vol*‘(𝐴𝐵)) = +∞) → (vol*‘(𝐴𝐵)) ∈ ℝ)
6463ad2ant1 1131 . . . . . . . 8 ((𝜑 ∧ (vol*‘(𝐴𝐵)) ∈ ℝ ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) → (𝐴𝐵) ⊆ ℝ)
65 simp2 1135 . . . . . . . 8 ((𝜑 ∧ (vol*‘(𝐴𝐵)) ∈ ℝ ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) → (vol*‘(𝐴𝐵)) ∈ ℝ)
6673ad2ant1 1131 . . . . . . . 8 ((𝜑 ∧ (vol*‘(𝐴𝐵)) ∈ ℝ ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) → (𝐴𝐵) ⊆ ℝ)
67 simp3 1136 . . . . . . . 8 ((𝜑 ∧ (vol*‘(𝐴𝐵)) ∈ ℝ ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) → (vol*‘(𝐴𝐵)) ∈ ℝ)
68 ovolun 25248 . . . . . . . 8 ((((𝐴𝐵) ⊆ ℝ ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) ∧ ((𝐴𝐵) ⊆ ℝ ∧ (vol*‘(𝐴𝐵)) ∈ ℝ)) → (vol*‘((𝐴𝐵) ∪ (𝐴𝐵))) ≤ ((vol*‘(𝐴𝐵)) + (vol*‘(𝐴𝐵))))
6964, 65, 66, 67, 68syl22anc 835 . . . . . . 7 ((𝜑 ∧ (vol*‘(𝐴𝐵)) ∈ ℝ ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) → (vol*‘((𝐴𝐵) ∪ (𝐴𝐵))) ≤ ((vol*‘(𝐴𝐵)) + (vol*‘(𝐴𝐵))))
70 rexadd 13215 . . . . . . . . 9 (((vol*‘(𝐴𝐵)) ∈ ℝ ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) → ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))) = ((vol*‘(𝐴𝐵)) + (vol*‘(𝐴𝐵))))
7170eqcomd 2736 . . . . . . . 8 (((vol*‘(𝐴𝐵)) ∈ ℝ ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) → ((vol*‘(𝐴𝐵)) + (vol*‘(𝐴𝐵))) = ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))))
72713adant1 1128 . . . . . . 7 ((𝜑 ∧ (vol*‘(𝐴𝐵)) ∈ ℝ ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) → ((vol*‘(𝐴𝐵)) + (vol*‘(𝐴𝐵))) = ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))))
7369, 72breqtrd 5173 . . . . . 6 ((𝜑 ∧ (vol*‘(𝐴𝐵)) ∈ ℝ ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) → (vol*‘((𝐴𝐵) ∪ (𝐴𝐵))) ≤ ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))))
7456, 57, 63, 73syl3anc 1369 . . . . 5 (((𝜑 ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) ∧ ¬ (vol*‘(𝐴𝐵)) = +∞) → (vol*‘((𝐴𝐵) ∪ (𝐴𝐵))) ≤ ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))))
7555, 74pm2.61dan 809 . . . 4 ((𝜑 ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) → (vol*‘((𝐴𝐵) ∪ (𝐴𝐵))) ≤ ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))))
7635, 43, 75syl2anc 582 . . 3 ((𝜑 ∧ ¬ (vol*‘(𝐴𝐵)) = +∞) → (vol*‘((𝐴𝐵) ∪ (𝐴𝐵))) ≤ ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))))
7734, 76pm2.61dan 809 . 2 (𝜑 → (vol*‘((𝐴𝐵) ∪ (𝐴𝐵))) ≤ ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))))
784, 77eqbrtrd 5169 1 (𝜑 → (vol*‘𝐴) ≤ ((vol*‘(𝐴𝐵)) +𝑒 (vol*‘(𝐴𝐵))))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 205  wa 394  w3a 1085   = wceq 1539  wcel 2104  wne 2938  Vcvv 3472  cdif 3944  cun 3945  cin 3946  wss 3947  𝒫 cpw 4601   class class class wbr 5147  cfv 6542  (class class class)co 7411  cr 11111  0cc0 11112   + caddc 11115  +∞cpnf 11249  -∞cmnf 11250  *cxr 11251  cle 11253   +𝑒 cxad 13094  [,]cicc 13331  vol*covol 25211
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1911  ax-6 1969  ax-7 2009  ax-8 2106  ax-9 2114  ax-10 2135  ax-11 2152  ax-12 2169  ax-ext 2701  ax-sep 5298  ax-nul 5305  ax-pow 5362  ax-pr 5426  ax-un 7727  ax-cnex 11168  ax-resscn 11169  ax-1cn 11170  ax-icn 11171  ax-addcl 11172  ax-addrcl 11173  ax-mulcl 11174  ax-mulrcl 11175  ax-mulcom 11176  ax-addass 11177  ax-mulass 11178  ax-distr 11179  ax-i2m1 11180  ax-1ne0 11181  ax-1rid 11182  ax-rnegex 11183  ax-rrecex 11184  ax-cnre 11185  ax-pre-lttri 11186  ax-pre-lttrn 11187  ax-pre-ltadd 11188  ax-pre-mulgt0 11189  ax-pre-sup 11190
This theorem depends on definitions:  df-bi 206  df-an 395  df-or 844  df-3or 1086  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2532  df-eu 2561  df-clab 2708  df-cleq 2722  df-clel 2808  df-nfc 2883  df-ne 2939  df-nel 3045  df-ral 3060  df-rex 3069  df-rmo 3374  df-reu 3375  df-rab 3431  df-v 3474  df-sbc 3777  df-csb 3893  df-dif 3950  df-un 3952  df-in 3954  df-ss 3964  df-pss 3966  df-nul 4322  df-if 4528  df-pw 4603  df-sn 4628  df-pr 4630  df-op 4634  df-uni 4908  df-iun 4998  df-br 5148  df-opab 5210  df-mpt 5231  df-tr 5265  df-id 5573  df-eprel 5579  df-po 5587  df-so 5588  df-fr 5630  df-we 5632  df-xp 5681  df-rel 5682  df-cnv 5683  df-co 5684  df-dm 5685  df-rn 5686  df-res 5687  df-ima 5688  df-pred 6299  df-ord 6366  df-on 6367  df-lim 6368  df-suc 6369  df-iota 6494  df-fun 6544  df-fn 6545  df-f 6546  df-f1 6547  df-fo 6548  df-f1o 6549  df-fv 6550  df-riota 7367  df-ov 7414  df-oprab 7415  df-mpo 7416  df-om 7858  df-1st 7977  df-2nd 7978  df-frecs 8268  df-wrecs 8299  df-recs 8373  df-rdg 8412  df-er 8705  df-map 8824  df-en 8942  df-dom 8943  df-sdom 8944  df-sup 9439  df-inf 9440  df-pnf 11254  df-mnf 11255  df-xr 11256  df-ltxr 11257  df-le 11258  df-sub 11450  df-neg 11451  df-div 11876  df-nn 12217  df-2 12279  df-3 12280  df-n0 12477  df-z 12563  df-uz 12827  df-q 12937  df-rp 12979  df-xadd 13097  df-ioo 13332  df-ico 13334  df-icc 13335  df-fz 13489  df-fl 13761  df-seq 13971  df-exp 14032  df-cj 15050  df-re 15051  df-im 15052  df-sqrt 15186  df-abs 15187  df-ovol 25213
This theorem is referenced by:  ismbl4  45007
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