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Mirrors > Home > MPE Home > Th. List > inmbl | Structured version Visualization version GIF version |
Description: An intersection of measurable sets is measurable. (Contributed by Mario Carneiro, 18-Mar-2014.) |
Ref | Expression |
---|---|
inmbl | ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → (𝐴 ∩ 𝐵) ∈ dom vol) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | difundi 4210 | . . 3 ⊢ (ℝ ∖ ((ℝ ∖ 𝐴) ∪ (ℝ ∖ 𝐵))) = ((ℝ ∖ (ℝ ∖ 𝐴)) ∩ (ℝ ∖ (ℝ ∖ 𝐵))) | |
2 | mblss 24600 | . . . . 5 ⊢ (𝐴 ∈ dom vol → 𝐴 ⊆ ℝ) | |
3 | dfss4 4189 | . . . . 5 ⊢ (𝐴 ⊆ ℝ ↔ (ℝ ∖ (ℝ ∖ 𝐴)) = 𝐴) | |
4 | 2, 3 | sylib 217 | . . . 4 ⊢ (𝐴 ∈ dom vol → (ℝ ∖ (ℝ ∖ 𝐴)) = 𝐴) |
5 | mblss 24600 | . . . . 5 ⊢ (𝐵 ∈ dom vol → 𝐵 ⊆ ℝ) | |
6 | dfss4 4189 | . . . . 5 ⊢ (𝐵 ⊆ ℝ ↔ (ℝ ∖ (ℝ ∖ 𝐵)) = 𝐵) | |
7 | 5, 6 | sylib 217 | . . . 4 ⊢ (𝐵 ∈ dom vol → (ℝ ∖ (ℝ ∖ 𝐵)) = 𝐵) |
8 | 4, 7 | ineqan12d 4145 | . . 3 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → ((ℝ ∖ (ℝ ∖ 𝐴)) ∩ (ℝ ∖ (ℝ ∖ 𝐵))) = (𝐴 ∩ 𝐵)) |
9 | 1, 8 | syl5eq 2791 | . 2 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → (ℝ ∖ ((ℝ ∖ 𝐴) ∪ (ℝ ∖ 𝐵))) = (𝐴 ∩ 𝐵)) |
10 | cmmbl 24603 | . . . 4 ⊢ (𝐴 ∈ dom vol → (ℝ ∖ 𝐴) ∈ dom vol) | |
11 | cmmbl 24603 | . . . 4 ⊢ (𝐵 ∈ dom vol → (ℝ ∖ 𝐵) ∈ dom vol) | |
12 | unmbl 24606 | . . . 4 ⊢ (((ℝ ∖ 𝐴) ∈ dom vol ∧ (ℝ ∖ 𝐵) ∈ dom vol) → ((ℝ ∖ 𝐴) ∪ (ℝ ∖ 𝐵)) ∈ dom vol) | |
13 | 10, 11, 12 | syl2an 595 | . . 3 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → ((ℝ ∖ 𝐴) ∪ (ℝ ∖ 𝐵)) ∈ dom vol) |
14 | cmmbl 24603 | . . 3 ⊢ (((ℝ ∖ 𝐴) ∪ (ℝ ∖ 𝐵)) ∈ dom vol → (ℝ ∖ ((ℝ ∖ 𝐴) ∪ (ℝ ∖ 𝐵))) ∈ dom vol) | |
15 | 13, 14 | syl 17 | . 2 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → (ℝ ∖ ((ℝ ∖ 𝐴) ∪ (ℝ ∖ 𝐵))) ∈ dom vol) |
16 | 9, 15 | eqeltrrd 2840 | 1 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ dom vol) → (𝐴 ∩ 𝐵) ∈ dom vol) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 395 = wceq 1539 ∈ wcel 2108 ∖ cdif 3880 ∪ cun 3881 ∩ cin 3882 ⊆ wss 3883 dom cdm 5580 ℝcr 10801 volcvol 24532 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 ax-pre-sup 10880 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rmo 3071 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-om 7688 df-1st 7804 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-er 8456 df-map 8575 df-en 8692 df-dom 8693 df-sdom 8694 df-sup 9131 df-inf 9132 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-div 11563 df-nn 11904 df-2 11966 df-3 11967 df-n0 12164 df-z 12250 df-uz 12512 df-q 12618 df-rp 12660 df-ioo 13012 df-ico 13014 df-icc 13015 df-fz 13169 df-fl 13440 df-seq 13650 df-exp 13711 df-cj 14738 df-re 14739 df-im 14740 df-sqrt 14874 df-abs 14875 df-ovol 24533 df-vol 24534 |
This theorem is referenced by: difmbl 24612 volinun 24615 uniioombllem4 24655 subopnmbl 24673 volsup2 24674 volcn 24675 volivth 24676 mbfid 24704 ismbfd 24708 mbfres 24713 mbfmax 24718 mbfimaopnlem 24724 mbfimaopn2 24726 mbfaddlem 24729 mbfadd 24730 mbfsub 24731 i1fadd 24764 i1fmul 24765 itg1addlem2 24766 itg1addlem4 24768 itg1addlem4OLD 24769 itg1addlem5 24770 i1fres 24775 itg1climres 24784 mbfi1fseqlem4 24788 mbfmul 24796 itg2monolem1 24820 itg2cnlem2 24832 mbfposadd 35751 itg2addnclem2 35756 ftc1anclem6 35782 |
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