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Theorem volun 24245
 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 1188 . . . . . 6 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → 𝐴 ∈ dom vol)
2 mblss 24231 . . . . . . . 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 1189 . . . . . . . 8 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → 𝐵 ∈ dom vol)
5 mblss 24231 . . . . . . . 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 4091 . . . . . 6 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (𝐴𝐵) ⊆ ℝ)
8 readdcl 10658 . . . . . . . 8 (((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ) → ((vol*‘𝐴) + (vol*‘𝐵)) ∈ ℝ)
98adantl 485 . . . . . . 7 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → ((vol*‘𝐴) + (vol*‘𝐵)) ∈ ℝ)
10 simprl 770 . . . . . . . 8 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘𝐴) ∈ ℝ)
11 simprr 772 . . . . . . . 8 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘𝐵) ∈ ℝ)
12 ovolun 24199 . . . . . . . 8 (((𝐴 ⊆ ℝ ∧ (vol*‘𝐴) ∈ ℝ) ∧ (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘(𝐴𝐵)) ≤ ((vol*‘𝐴) + (vol*‘𝐵)))
133, 10, 6, 11, 12syl22anc 837 . . . . . . 7 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘(𝐴𝐵)) ≤ ((vol*‘𝐴) + (vol*‘𝐵)))
14 ovollecl 24183 . . . . . . 7 (((𝐴𝐵) ⊆ ℝ ∧ ((vol*‘𝐴) + (vol*‘𝐵)) ∈ ℝ ∧ (vol*‘(𝐴𝐵)) ≤ ((vol*‘𝐴) + (vol*‘𝐵))) → (vol*‘(𝐴𝐵)) ∈ ℝ)
157, 9, 13, 14syl3anc 1368 . . . . . 6 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘(𝐴𝐵)) ∈ ℝ)
16 mblsplit 24232 . . . . . 6 ((𝐴 ∈ dom vol ∧ (𝐴𝐵) ⊆ ℝ ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) → (vol*‘(𝐴𝐵)) = ((vol*‘((𝐴𝐵) ∩ 𝐴)) + (vol*‘((𝐴𝐵) ∖ 𝐴))))
171, 7, 15, 16syl3anc 1368 . . . . 5 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘(𝐴𝐵)) = ((vol*‘((𝐴𝐵) ∩ 𝐴)) + (vol*‘((𝐴𝐵) ∖ 𝐴))))
18 simpl3 1190 . . . . . 6 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (𝐴𝐵) = ∅)
19 indir 4180 . . . . . . . . . 10 ((𝐴𝐵) ∩ 𝐴) = ((𝐴𝐴) ∪ (𝐵𝐴))
20 inidm 4123 . . . . . . . . . . . 12 (𝐴𝐴) = 𝐴
21 incom 4106 . . . . . . . . . . . 12 (𝐵𝐴) = (𝐴𝐵)
2220, 21uneq12i 4066 . . . . . . . . . . 11 ((𝐴𝐴) ∪ (𝐵𝐴)) = (𝐴 ∪ (𝐴𝐵))
23 unabs 4159 . . . . . . . . . . 11 (𝐴 ∪ (𝐴𝐵)) = 𝐴
2422, 23eqtri 2781 . . . . . . . . . 10 ((𝐴𝐴) ∪ (𝐵𝐴)) = 𝐴
2519, 24eqtri 2781 . . . . . . . . 9 ((𝐴𝐵) ∩ 𝐴) = 𝐴
2625a1i 11 . . . . . . . 8 ((𝐴𝐵) = ∅ → ((𝐴𝐵) ∩ 𝐴) = 𝐴)
2726fveq2d 6662 . . . . . . 7 ((𝐴𝐵) = ∅ → (vol*‘((𝐴𝐵) ∩ 𝐴)) = (vol*‘𝐴))
28 uncom 4058 . . . . . . . . . . 11 (𝐴𝐵) = (𝐵𝐴)
2928difeq1i 4024 . . . . . . . . . 10 ((𝐴𝐵) ∖ 𝐴) = ((𝐵𝐴) ∖ 𝐴)
30 difun2 4377 . . . . . . . . . 10 ((𝐵𝐴) ∖ 𝐴) = (𝐵𝐴)
3129, 30eqtri 2781 . . . . . . . . 9 ((𝐴𝐵) ∖ 𝐴) = (𝐵𝐴)
3221eqeq1i 2763 . . . . . . . . . 10 ((𝐵𝐴) = ∅ ↔ (𝐴𝐵) = ∅)
33 disj3 4350 . . . . . . . . . 10 ((𝐵𝐴) = ∅ ↔ 𝐵 = (𝐵𝐴))
3432, 33sylbb1 240 . . . . . . . . 9 ((𝐴𝐵) = ∅ → 𝐵 = (𝐵𝐴))
3531, 34eqtr4id 2812 . . . . . . . 8 ((𝐴𝐵) = ∅ → ((𝐴𝐵) ∖ 𝐴) = 𝐵)
3635fveq2d 6662 . . . . . . 7 ((𝐴𝐵) = ∅ → (vol*‘((𝐴𝐵) ∖ 𝐴)) = (vol*‘𝐵))
3727, 36oveq12d 7168 . . . . . 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 2793 . . . 4 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘(𝐴𝐵)) = ((vol*‘𝐴) + (vol*‘𝐵)))
4039ex 416 . . 3 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) → (((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ) → (vol*‘(𝐴𝐵)) = ((vol*‘𝐴) + (vol*‘𝐵))))
41 mblvol 24230 . . . . . 6 (𝐴 ∈ dom vol → (vol‘𝐴) = (vol*‘𝐴))
4241eleq1d 2836 . . . . 5 (𝐴 ∈ dom vol → ((vol‘𝐴) ∈ ℝ ↔ (vol*‘𝐴) ∈ ℝ))
43 mblvol 24230 . . . . . 6 (𝐵 ∈ dom vol → (vol‘𝐵) = (vol*‘𝐵))
4443eleq1d 2836 . . . . 5 (𝐵 ∈ dom vol → ((vol‘𝐵) ∈ ℝ ↔ (vol*‘𝐵) ∈ ℝ))
4542, 44bi2anan9 638 . . . 4 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → (((vol‘𝐴) ∈ ℝ ∧ (vol‘𝐵) ∈ ℝ) ↔ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)))
46453adant3 1129 . . 3 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) → (((vol‘𝐴) ∈ ℝ ∧ (vol‘𝐵) ∈ ℝ) ↔ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)))
47 unmbl 24237 . . . . . 6 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → (𝐴𝐵) ∈ dom vol)
48 mblvol 24230 . . . . . 6 ((𝐴𝐵) ∈ dom vol → (vol‘(𝐴𝐵)) = (vol*‘(𝐴𝐵)))
4947, 48syl 17 . . . . 5 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → (vol‘(𝐴𝐵)) = (vol*‘(𝐴𝐵)))
5041, 43oveqan12d 7169 . . . . 5 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → ((vol‘𝐴) + (vol‘𝐵)) = ((vol*‘𝐴) + (vol*‘𝐵)))
5149, 50eqeq12d 2774 . . . 4 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → ((vol‘(𝐴𝐵)) = ((vol‘𝐴) + (vol‘𝐵)) ↔ (vol*‘(𝐴𝐵)) = ((vol*‘𝐴) + (vol*‘𝐵))))
52513adant3 1129 . . 3 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) → ((vol‘(𝐴𝐵)) = ((vol‘𝐴) + (vol‘𝐵)) ↔ (vol*‘(𝐴𝐵)) = ((vol*‘𝐴) + (vol*‘𝐵))))
5340, 46, 523imtr4d 297 . 2 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) → (((vol‘𝐴) ∈ ℝ ∧ (vol‘𝐵) ∈ ℝ) → (vol‘(𝐴𝐵)) = ((vol‘𝐴) + (vol‘𝐵))))
5453imp 410 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 209   ∧ wa 399   ∧ w3a 1084   = wceq 1538   ∈ wcel 2111   ∖ cdif 3855   ∪ cun 3856   ∩ cin 3857   ⊆ wss 3858  ∅c0 4225   class class class wbr 5032  dom cdm 5524  ‘cfv 6335  (class class class)co 7150  ℝcr 10574   + caddc 10578   ≤ cle 10714  vol*covol 24162  volcvol 24163 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2729  ax-sep 5169  ax-nul 5176  ax-pow 5234  ax-pr 5298  ax-un 7459  ax-cnex 10631  ax-resscn 10632  ax-1cn 10633  ax-icn 10634  ax-addcl 10635  ax-addrcl 10636  ax-mulcl 10637  ax-mulrcl 10638  ax-mulcom 10639  ax-addass 10640  ax-mulass 10641  ax-distr 10642  ax-i2m1 10643  ax-1ne0 10644  ax-1rid 10645  ax-rnegex 10646  ax-rrecex 10647  ax-cnre 10648  ax-pre-lttri 10649  ax-pre-lttrn 10650  ax-pre-ltadd 10651  ax-pre-mulgt0 10652  ax-pre-sup 10653 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2557  df-eu 2588  df-clab 2736  df-cleq 2750  df-clel 2830  df-nfc 2901  df-ne 2952  df-nel 3056  df-ral 3075  df-rex 3076  df-reu 3077  df-rmo 3078  df-rab 3079  df-v 3411  df-sbc 3697  df-csb 3806  df-dif 3861  df-un 3863  df-in 3865  df-ss 3875  df-pss 3877  df-nul 4226  df-if 4421  df-pw 4496  df-sn 4523  df-pr 4525  df-tp 4527  df-op 4529  df-uni 4799  df-iun 4885  df-br 5033  df-opab 5095  df-mpt 5113  df-tr 5139  df-id 5430  df-eprel 5435  df-po 5443  df-so 5444  df-fr 5483  df-we 5485  df-xp 5530  df-rel 5531  df-cnv 5532  df-co 5533  df-dm 5534  df-rn 5535  df-res 5536  df-ima 5537  df-pred 6126  df-ord 6172  df-on 6173  df-lim 6174  df-suc 6175  df-iota 6294  df-fun 6337  df-fn 6338  df-f 6339  df-f1 6340  df-fo 6341  df-f1o 6342  df-fv 6343  df-riota 7108  df-ov 7153  df-oprab 7154  df-mpo 7155  df-om 7580  df-1st 7693  df-2nd 7694  df-wrecs 7957  df-recs 8018  df-rdg 8056  df-er 8299  df-map 8418  df-en 8528  df-dom 8529  df-sdom 8530  df-sup 8939  df-inf 8940  df-pnf 10715  df-mnf 10716  df-xr 10717  df-ltxr 10718  df-le 10719  df-sub 10910  df-neg 10911  df-div 11336  df-nn 11675  df-2 11737  df-3 11738  df-n0 11935  df-z 12021  df-uz 12283  df-q 12389  df-rp 12431  df-ioo 12783  df-ico 12785  df-icc 12786  df-fz 12940  df-fl 13211  df-seq 13419  df-exp 13480  df-cj 14506  df-re 14507  df-im 14508  df-sqrt 14642  df-abs 14643  df-ovol 24164  df-vol 24165 This theorem is referenced by:  volinun  24246  volfiniun  24247  volsup  24256  ovolioo  24268  ismblfin  35378  volioc  42980  volico  42991
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