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Theorem volun 24061
Description: The Lebesgue measure function is finitely additive. (Contributed by Mario Carneiro, 18-Mar-2014.)
Assertion
Ref Expression
volun (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol‘𝐴) ∈ ℝ ∧ (vol‘𝐵) ∈ ℝ)) → (vol‘(𝐴𝐵)) = ((vol‘𝐴) + (vol‘𝐵)))

Proof of Theorem volun
StepHypRef Expression
1 simpl1 1185 . . . . . 6 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → 𝐴 ∈ dom vol)
2 mblss 24047 . . . . . . . 8 (𝐴 ∈ dom vol → 𝐴 ⊆ ℝ)
31, 2syl 17 . . . . . . 7 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → 𝐴 ⊆ ℝ)
4 simpl2 1186 . . . . . . . 8 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → 𝐵 ∈ dom vol)
5 mblss 24047 . . . . . . . 8 (𝐵 ∈ dom vol → 𝐵 ⊆ ℝ)
64, 5syl 17 . . . . . . 7 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → 𝐵 ⊆ ℝ)
73, 6unssd 4166 . . . . . 6 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (𝐴𝐵) ⊆ ℝ)
8 readdcl 10609 . . . . . . . 8 (((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ) → ((vol*‘𝐴) + (vol*‘𝐵)) ∈ ℝ)
98adantl 482 . . . . . . 7 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → ((vol*‘𝐴) + (vol*‘𝐵)) ∈ ℝ)
10 simprl 767 . . . . . . . 8 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘𝐴) ∈ ℝ)
11 simprr 769 . . . . . . . 8 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘𝐵) ∈ ℝ)
12 ovolun 24015 . . . . . . . 8 (((𝐴 ⊆ ℝ ∧ (vol*‘𝐴) ∈ ℝ) ∧ (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘(𝐴𝐵)) ≤ ((vol*‘𝐴) + (vol*‘𝐵)))
133, 10, 6, 11, 12syl22anc 836 . . . . . . 7 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘(𝐴𝐵)) ≤ ((vol*‘𝐴) + (vol*‘𝐵)))
14 ovollecl 23999 . . . . . . 7 (((𝐴𝐵) ⊆ ℝ ∧ ((vol*‘𝐴) + (vol*‘𝐵)) ∈ ℝ ∧ (vol*‘(𝐴𝐵)) ≤ ((vol*‘𝐴) + (vol*‘𝐵))) → (vol*‘(𝐴𝐵)) ∈ ℝ)
157, 9, 13, 14syl3anc 1365 . . . . . 6 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘(𝐴𝐵)) ∈ ℝ)
16 mblsplit 24048 . . . . . 6 ((𝐴 ∈ dom vol ∧ (𝐴𝐵) ⊆ ℝ ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) → (vol*‘(𝐴𝐵)) = ((vol*‘((𝐴𝐵) ∩ 𝐴)) + (vol*‘((𝐴𝐵) ∖ 𝐴))))
171, 7, 15, 16syl3anc 1365 . . . . 5 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘(𝐴𝐵)) = ((vol*‘((𝐴𝐵) ∩ 𝐴)) + (vol*‘((𝐴𝐵) ∖ 𝐴))))
18 simpl3 1187 . . . . . 6 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (𝐴𝐵) = ∅)
19 indir 4256 . . . . . . . . . 10 ((𝐴𝐵) ∩ 𝐴) = ((𝐴𝐴) ∪ (𝐵𝐴))
20 inidm 4199 . . . . . . . . . . . 12 (𝐴𝐴) = 𝐴
21 incom 4182 . . . . . . . . . . . 12 (𝐵𝐴) = (𝐴𝐵)
2220, 21uneq12i 4141 . . . . . . . . . . 11 ((𝐴𝐴) ∪ (𝐵𝐴)) = (𝐴 ∪ (𝐴𝐵))
23 unabs 4235 . . . . . . . . . . 11 (𝐴 ∪ (𝐴𝐵)) = 𝐴
2422, 23eqtri 2849 . . . . . . . . . 10 ((𝐴𝐴) ∪ (𝐵𝐴)) = 𝐴
2519, 24eqtri 2849 . . . . . . . . 9 ((𝐴𝐵) ∩ 𝐴) = 𝐴
2625a1i 11 . . . . . . . 8 ((𝐴𝐵) = ∅ → ((𝐴𝐵) ∩ 𝐴) = 𝐴)
2726fveq2d 6671 . . . . . . 7 ((𝐴𝐵) = ∅ → (vol*‘((𝐴𝐵) ∩ 𝐴)) = (vol*‘𝐴))
2821eqeq1i 2831 . . . . . . . . . 10 ((𝐵𝐴) = ∅ ↔ (𝐴𝐵) = ∅)
29 disj3 4406 . . . . . . . . . 10 ((𝐵𝐴) = ∅ ↔ 𝐵 = (𝐵𝐴))
3028, 29sylbb1 238 . . . . . . . . 9 ((𝐴𝐵) = ∅ → 𝐵 = (𝐵𝐴))
31 uncom 4133 . . . . . . . . . . 11 (𝐴𝐵) = (𝐵𝐴)
3231difeq1i 4099 . . . . . . . . . 10 ((𝐴𝐵) ∖ 𝐴) = ((𝐵𝐴) ∖ 𝐴)
33 difun2 4432 . . . . . . . . . 10 ((𝐵𝐴) ∖ 𝐴) = (𝐵𝐴)
3432, 33eqtri 2849 . . . . . . . . 9 ((𝐴𝐵) ∖ 𝐴) = (𝐵𝐴)
3530, 34syl6reqr 2880 . . . . . . . 8 ((𝐴𝐵) = ∅ → ((𝐴𝐵) ∖ 𝐴) = 𝐵)
3635fveq2d 6671 . . . . . . 7 ((𝐴𝐵) = ∅ → (vol*‘((𝐴𝐵) ∖ 𝐴)) = (vol*‘𝐵))
3727, 36oveq12d 7166 . . . . . 6 ((𝐴𝐵) = ∅ → ((vol*‘((𝐴𝐵) ∩ 𝐴)) + (vol*‘((𝐴𝐵) ∖ 𝐴))) = ((vol*‘𝐴) + (vol*‘𝐵)))
3818, 37syl 17 . . . . 5 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → ((vol*‘((𝐴𝐵) ∩ 𝐴)) + (vol*‘((𝐴𝐵) ∖ 𝐴))) = ((vol*‘𝐴) + (vol*‘𝐵)))
3917, 38eqtrd 2861 . . . 4 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘(𝐴𝐵)) = ((vol*‘𝐴) + (vol*‘𝐵)))
4039ex 413 . . 3 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) → (((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ) → (vol*‘(𝐴𝐵)) = ((vol*‘𝐴) + (vol*‘𝐵))))
41 mblvol 24046 . . . . . 6 (𝐴 ∈ dom vol → (vol‘𝐴) = (vol*‘𝐴))
4241eleq1d 2902 . . . . 5 (𝐴 ∈ dom vol → ((vol‘𝐴) ∈ ℝ ↔ (vol*‘𝐴) ∈ ℝ))
43 mblvol 24046 . . . . . 6 (𝐵 ∈ dom vol → (vol‘𝐵) = (vol*‘𝐵))
4443eleq1d 2902 . . . . 5 (𝐵 ∈ dom vol → ((vol‘𝐵) ∈ ℝ ↔ (vol*‘𝐵) ∈ ℝ))
4542, 44bi2anan9 635 . . . 4 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → (((vol‘𝐴) ∈ ℝ ∧ (vol‘𝐵) ∈ ℝ) ↔ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)))
46453adant3 1126 . . 3 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) → (((vol‘𝐴) ∈ ℝ ∧ (vol‘𝐵) ∈ ℝ) ↔ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)))
47 unmbl 24053 . . . . . 6 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → (𝐴𝐵) ∈ dom vol)
48 mblvol 24046 . . . . . 6 ((𝐴𝐵) ∈ dom vol → (vol‘(𝐴𝐵)) = (vol*‘(𝐴𝐵)))
4947, 48syl 17 . . . . 5 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → (vol‘(𝐴𝐵)) = (vol*‘(𝐴𝐵)))
5041, 43oveqan12d 7167 . . . . 5 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → ((vol‘𝐴) + (vol‘𝐵)) = ((vol*‘𝐴) + (vol*‘𝐵)))
5149, 50eqeq12d 2842 . . . 4 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → ((vol‘(𝐴𝐵)) = ((vol‘𝐴) + (vol‘𝐵)) ↔ (vol*‘(𝐴𝐵)) = ((vol*‘𝐴) + (vol*‘𝐵))))
52513adant3 1126 . . 3 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) → ((vol‘(𝐴𝐵)) = ((vol‘𝐴) + (vol‘𝐵)) ↔ (vol*‘(𝐴𝐵)) = ((vol*‘𝐴) + (vol*‘𝐵))))
5340, 46, 523imtr4d 295 . 2 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) → (((vol‘𝐴) ∈ ℝ ∧ (vol‘𝐵) ∈ ℝ) → (vol‘(𝐴𝐵)) = ((vol‘𝐴) + (vol‘𝐵))))
5453imp 407 1 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol‘𝐴) ∈ ℝ ∧ (vol‘𝐵) ∈ ℝ)) → (vol‘(𝐴𝐵)) = ((vol‘𝐴) + (vol‘𝐵)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 207  wa 396  w3a 1081   = wceq 1530  wcel 2107  cdif 3937  cun 3938  cin 3939  wss 3940  c0 4295   class class class wbr 5063  dom cdm 5554  cfv 6352  (class class class)co 7148  cr 10525   + caddc 10529  cle 10665  vol*covol 23978  volcvol 23979
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1904  ax-6 1963  ax-7 2008  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2153  ax-12 2169  ax-ext 2798  ax-sep 5200  ax-nul 5207  ax-pow 5263  ax-pr 5326  ax-un 7451  ax-cnex 10582  ax-resscn 10583  ax-1cn 10584  ax-icn 10585  ax-addcl 10586  ax-addrcl 10587  ax-mulcl 10588  ax-mulrcl 10589  ax-mulcom 10590  ax-addass 10591  ax-mulass 10592  ax-distr 10593  ax-i2m1 10594  ax-1ne0 10595  ax-1rid 10596  ax-rnegex 10597  ax-rrecex 10598  ax-cnre 10599  ax-pre-lttri 10600  ax-pre-lttrn 10601  ax-pre-ltadd 10602  ax-pre-mulgt0 10603  ax-pre-sup 10604
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 844  df-3or 1082  df-3an 1083  df-tru 1533  df-ex 1774  df-nf 1778  df-sb 2063  df-mo 2620  df-eu 2652  df-clab 2805  df-cleq 2819  df-clel 2898  df-nfc 2968  df-ne 3022  df-nel 3129  df-ral 3148  df-rex 3149  df-reu 3150  df-rmo 3151  df-rab 3152  df-v 3502  df-sbc 3777  df-csb 3888  df-dif 3943  df-un 3945  df-in 3947  df-ss 3956  df-pss 3958  df-nul 4296  df-if 4471  df-pw 4544  df-sn 4565  df-pr 4567  df-tp 4569  df-op 4571  df-uni 4838  df-iun 4919  df-br 5064  df-opab 5126  df-mpt 5144  df-tr 5170  df-id 5459  df-eprel 5464  df-po 5473  df-so 5474  df-fr 5513  df-we 5515  df-xp 5560  df-rel 5561  df-cnv 5562  df-co 5563  df-dm 5564  df-rn 5565  df-res 5566  df-ima 5567  df-pred 6146  df-ord 6192  df-on 6193  df-lim 6194  df-suc 6195  df-iota 6312  df-fun 6354  df-fn 6355  df-f 6356  df-f1 6357  df-fo 6358  df-f1o 6359  df-fv 6360  df-riota 7106  df-ov 7151  df-oprab 7152  df-mpo 7153  df-om 7569  df-1st 7680  df-2nd 7681  df-wrecs 7938  df-recs 7999  df-rdg 8037  df-er 8279  df-map 8398  df-en 8499  df-dom 8500  df-sdom 8501  df-sup 8895  df-inf 8896  df-pnf 10666  df-mnf 10667  df-xr 10668  df-ltxr 10669  df-le 10670  df-sub 10861  df-neg 10862  df-div 11287  df-nn 11628  df-2 11689  df-3 11690  df-n0 11887  df-z 11971  df-uz 12233  df-q 12338  df-rp 12380  df-ioo 12732  df-ico 12734  df-icc 12735  df-fz 12883  df-fl 13152  df-seq 13360  df-exp 13420  df-cj 14448  df-re 14449  df-im 14450  df-sqrt 14584  df-abs 14585  df-ovol 23980  df-vol 23981
This theorem is referenced by:  volinun  24062  volfiniun  24063  volsup  24072  ovolioo  24084  ismblfin  34800  volioc  42122  volico  42134
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