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Theorem volun 23294
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 1062 . . . . . 6 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → 𝐴 ∈ dom vol)
2 mblss 23280 . . . . . . . 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 1063 . . . . . . . 8 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → 𝐵 ∈ dom vol)
5 mblss 23280 . . . . . . . 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 3781 . . . . . 6 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (𝐴𝐵) ⊆ ℝ)
8 readdcl 10004 . . . . . . . 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 793 . . . . . . . 8 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘𝐴) ∈ ℝ)
11 simprr 795 . . . . . . . 8 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘𝐵) ∈ ℝ)
12 ovolun 23248 . . . . . . . 8 (((𝐴 ⊆ ℝ ∧ (vol*‘𝐴) ∈ ℝ) ∧ (𝐵 ⊆ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘(𝐴𝐵)) ≤ ((vol*‘𝐴) + (vol*‘𝐵)))
133, 10, 6, 11, 12syl22anc 1325 . . . . . . 7 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘(𝐴𝐵)) ≤ ((vol*‘𝐴) + (vol*‘𝐵)))
14 ovollecl 23232 . . . . . . 7 (((𝐴𝐵) ⊆ ℝ ∧ ((vol*‘𝐴) + (vol*‘𝐵)) ∈ ℝ ∧ (vol*‘(𝐴𝐵)) ≤ ((vol*‘𝐴) + (vol*‘𝐵))) → (vol*‘(𝐴𝐵)) ∈ ℝ)
157, 9, 13, 14syl3anc 1324 . . . . . 6 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘(𝐴𝐵)) ∈ ℝ)
16 mblsplit 23281 . . . . . 6 ((𝐴 ∈ dom vol ∧ (𝐴𝐵) ⊆ ℝ ∧ (vol*‘(𝐴𝐵)) ∈ ℝ) → (vol*‘(𝐴𝐵)) = ((vol*‘((𝐴𝐵) ∩ 𝐴)) + (vol*‘((𝐴𝐵) ∖ 𝐴))))
171, 7, 15, 16syl3anc 1324 . . . . 5 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘(𝐴𝐵)) = ((vol*‘((𝐴𝐵) ∩ 𝐴)) + (vol*‘((𝐴𝐵) ∖ 𝐴))))
18 simpl3 1064 . . . . . 6 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (𝐴𝐵) = ∅)
19 indir 3867 . . . . . . . . . 10 ((𝐴𝐵) ∩ 𝐴) = ((𝐴𝐴) ∪ (𝐵𝐴))
20 inidm 3814 . . . . . . . . . . . 12 (𝐴𝐴) = 𝐴
21 incom 3797 . . . . . . . . . . . 12 (𝐵𝐴) = (𝐴𝐵)
2220, 21uneq12i 3757 . . . . . . . . . . 11 ((𝐴𝐴) ∪ (𝐵𝐴)) = (𝐴 ∪ (𝐴𝐵))
23 unabs 3846 . . . . . . . . . . 11 (𝐴 ∪ (𝐴𝐵)) = 𝐴
2422, 23eqtri 2642 . . . . . . . . . 10 ((𝐴𝐴) ∪ (𝐵𝐴)) = 𝐴
2519, 24eqtri 2642 . . . . . . . . 9 ((𝐴𝐵) ∩ 𝐴) = 𝐴
2625a1i 11 . . . . . . . 8 ((𝐴𝐵) = ∅ → ((𝐴𝐵) ∩ 𝐴) = 𝐴)
2726fveq2d 6182 . . . . . . 7 ((𝐴𝐵) = ∅ → (vol*‘((𝐴𝐵) ∩ 𝐴)) = (vol*‘𝐴))
2821eqeq1i 2625 . . . . . . . . . . 11 ((𝐵𝐴) = ∅ ↔ (𝐴𝐵) = ∅)
29 disj3 4012 . . . . . . . . . . 11 ((𝐵𝐴) = ∅ ↔ 𝐵 = (𝐵𝐴))
3028, 29bitr3i 266 . . . . . . . . . 10 ((𝐴𝐵) = ∅ ↔ 𝐵 = (𝐵𝐴))
3130biimpi 206 . . . . . . . . 9 ((𝐴𝐵) = ∅ → 𝐵 = (𝐵𝐴))
32 uncom 3749 . . . . . . . . . . 11 (𝐴𝐵) = (𝐵𝐴)
3332difeq1i 3716 . . . . . . . . . 10 ((𝐴𝐵) ∖ 𝐴) = ((𝐵𝐴) ∖ 𝐴)
34 difun2 4039 . . . . . . . . . 10 ((𝐵𝐴) ∖ 𝐴) = (𝐵𝐴)
3533, 34eqtri 2642 . . . . . . . . 9 ((𝐴𝐵) ∖ 𝐴) = (𝐵𝐴)
3631, 35syl6reqr 2673 . . . . . . . 8 ((𝐴𝐵) = ∅ → ((𝐴𝐵) ∖ 𝐴) = 𝐵)
3736fveq2d 6182 . . . . . . 7 ((𝐴𝐵) = ∅ → (vol*‘((𝐴𝐵) ∖ 𝐴)) = (vol*‘𝐵))
3827, 37oveq12d 6653 . . . . . 6 ((𝐴𝐵) = ∅ → ((vol*‘((𝐴𝐵) ∩ 𝐴)) + (vol*‘((𝐴𝐵) ∖ 𝐴))) = ((vol*‘𝐴) + (vol*‘𝐵)))
3918, 38syl 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)))
4017, 39eqtrd 2654 . . . 4 (((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) ∧ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)) → (vol*‘(𝐴𝐵)) = ((vol*‘𝐴) + (vol*‘𝐵)))
4140ex 450 . . 3 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) → (((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ) → (vol*‘(𝐴𝐵)) = ((vol*‘𝐴) + (vol*‘𝐵))))
42 mblvol 23279 . . . . . 6 (𝐴 ∈ dom vol → (vol‘𝐴) = (vol*‘𝐴))
4342eleq1d 2684 . . . . 5 (𝐴 ∈ dom vol → ((vol‘𝐴) ∈ ℝ ↔ (vol*‘𝐴) ∈ ℝ))
44 mblvol 23279 . . . . . 6 (𝐵 ∈ dom vol → (vol‘𝐵) = (vol*‘𝐵))
4544eleq1d 2684 . . . . 5 (𝐵 ∈ dom vol → ((vol‘𝐵) ∈ ℝ ↔ (vol*‘𝐵) ∈ ℝ))
4643, 45bi2anan9 916 . . . 4 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → (((vol‘𝐴) ∈ ℝ ∧ (vol‘𝐵) ∈ ℝ) ↔ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)))
47463adant3 1079 . . 3 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) → (((vol‘𝐴) ∈ ℝ ∧ (vol‘𝐵) ∈ ℝ) ↔ ((vol*‘𝐴) ∈ ℝ ∧ (vol*‘𝐵) ∈ ℝ)))
48 unmbl 23286 . . . . . 6 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → (𝐴𝐵) ∈ dom vol)
49 mblvol 23279 . . . . . 6 ((𝐴𝐵) ∈ dom vol → (vol‘(𝐴𝐵)) = (vol*‘(𝐴𝐵)))
5048, 49syl 17 . . . . 5 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → (vol‘(𝐴𝐵)) = (vol*‘(𝐴𝐵)))
5142, 44oveqan12d 6654 . . . . 5 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → ((vol‘𝐴) + (vol‘𝐵)) = ((vol*‘𝐴) + (vol*‘𝐵)))
5250, 51eqeq12d 2635 . . . 4 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → ((vol‘(𝐴𝐵)) = ((vol‘𝐴) + (vol‘𝐵)) ↔ (vol*‘(𝐴𝐵)) = ((vol*‘𝐴) + (vol*‘𝐵))))
53523adant3 1079 . . 3 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) → ((vol‘(𝐴𝐵)) = ((vol‘𝐴) + (vol‘𝐵)) ↔ (vol*‘(𝐴𝐵)) = ((vol*‘𝐴) + (vol*‘𝐵))))
5441, 47, 533imtr4d 283 . 2 ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol ∧ (𝐴𝐵) = ∅) → (((vol‘𝐴) ∈ ℝ ∧ (vol‘𝐵) ∈ ℝ) → (vol‘(𝐴𝐵)) = ((vol‘𝐴) + (vol‘𝐵))))
5554imp 445 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 196  wa 384  w3a 1036   = wceq 1481  wcel 1988  cdif 3564  cun 3565  cin 3566  wss 3567  c0 3907   class class class wbr 4644  dom cdm 5104  cfv 5876  (class class class)co 6635  cr 9920   + caddc 9924  cle 10060  vol*covol 23212  volcvol 23213
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1720  ax-4 1735  ax-5 1837  ax-6 1886  ax-7 1933  ax-8 1990  ax-9 1997  ax-10 2017  ax-11 2032  ax-12 2045  ax-13 2244  ax-ext 2600  ax-sep 4772  ax-nul 4780  ax-pow 4834  ax-pr 4897  ax-un 6934  ax-cnex 9977  ax-resscn 9978  ax-1cn 9979  ax-icn 9980  ax-addcl 9981  ax-addrcl 9982  ax-mulcl 9983  ax-mulrcl 9984  ax-mulcom 9985  ax-addass 9986  ax-mulass 9987  ax-distr 9988  ax-i2m1 9989  ax-1ne0 9990  ax-1rid 9991  ax-rnegex 9992  ax-rrecex 9993  ax-cnre 9994  ax-pre-lttri 9995  ax-pre-lttrn 9996  ax-pre-ltadd 9997  ax-pre-mulgt0 9998  ax-pre-sup 9999
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1484  df-ex 1703  df-nf 1708  df-sb 1879  df-eu 2472  df-mo 2473  df-clab 2607  df-cleq 2613  df-clel 2616  df-nfc 2751  df-ne 2792  df-nel 2895  df-ral 2914  df-rex 2915  df-reu 2916  df-rmo 2917  df-rab 2918  df-v 3197  df-sbc 3430  df-csb 3527  df-dif 3570  df-un 3572  df-in 3574  df-ss 3581  df-pss 3583  df-nul 3908  df-if 4078  df-pw 4151  df-sn 4169  df-pr 4171  df-tp 4173  df-op 4175  df-uni 4428  df-iun 4513  df-br 4645  df-opab 4704  df-mpt 4721  df-tr 4744  df-id 5014  df-eprel 5019  df-po 5025  df-so 5026  df-fr 5063  df-we 5065  df-xp 5110  df-rel 5111  df-cnv 5112  df-co 5113  df-dm 5114  df-rn 5115  df-res 5116  df-ima 5117  df-pred 5668  df-ord 5714  df-on 5715  df-lim 5716  df-suc 5717  df-iota 5839  df-fun 5878  df-fn 5879  df-f 5880  df-f1 5881  df-fo 5882  df-f1o 5883  df-fv 5884  df-riota 6596  df-ov 6638  df-oprab 6639  df-mpt2 6640  df-om 7051  df-1st 7153  df-2nd 7154  df-wrecs 7392  df-recs 7453  df-rdg 7491  df-er 7727  df-map 7844  df-en 7941  df-dom 7942  df-sdom 7943  df-sup 8333  df-inf 8334  df-pnf 10061  df-mnf 10062  df-xr 10063  df-ltxr 10064  df-le 10065  df-sub 10253  df-neg 10254  df-div 10670  df-nn 11006  df-2 11064  df-3 11065  df-n0 11278  df-z 11363  df-uz 11673  df-q 11774  df-rp 11818  df-ioo 12164  df-ico 12166  df-icc 12167  df-fz 12312  df-fl 12576  df-seq 12785  df-exp 12844  df-cj 13820  df-re 13821  df-im 13822  df-sqrt 13956  df-abs 13957  df-ovol 23214  df-vol 23215
This theorem is referenced by:  volinun  23295  volfiniun  23296  volsup  23305  ovolioo  23317  ismblfin  33421  volioc  39951  volico  39963
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