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| Mirrors > Home > MPE Home > Th. List > mblvol | Structured version Visualization version GIF version | ||
| Description: The volume of a measurable set is the same as its outer volume. (Contributed by Mario Carneiro, 17-Mar-2014.) |
| Ref | Expression |
|---|---|
| mblvol | ⊢ (𝐴 ∈ dom vol → (vol‘𝐴) = (vol*‘𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | volres 25759 | . . 3 ⊢ vol = (vol* ↾ dom vol) | |
| 2 | 1 | fveq1i 6880 | . 2 ⊢ (vol‘𝐴) = ((vol* ↾ dom vol)‘𝐴) |
| 3 | fvres 6898 | . 2 ⊢ (𝐴 ∈ dom vol → ((vol* ↾ dom vol)‘𝐴) = (vol*‘𝐴)) | |
| 4 | 2, 3 | eqtrid 2807 | 1 ⊢ (𝐴 ∈ dom vol → (vol‘𝐴) = (vol*‘𝐴)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1570 ∈ wcel 2145 dom cdm 5655 ↾ cres 5657 ‘cfv 6533 vol*covol 25693 volcvol 25694 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2732 ax-sep 5251 ax-pr 5398 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2739 df-cleq 2752 df-clel 2835 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-xp 5661 df-rel 5662 df-cnv 5663 df-dm 5665 df-rn 5666 df-res 5667 df-iota 6489 df-fv 6541 df-vol 25696 |
| This theorem is used by: volss 25764 volun 25776 volinun 25777 volfiniun 25778 voliunlem3 25783 volsup 25787 iccvolcl 25798 ovolioo 25799 volioo 25800 ioovolcl 25801 uniioovol 25810 uniioombllem4 25817 volcn 25837 volivth 25838 vitalilem4 25842 i1fima2 25910 i1fd 25912 i1f0rn 25913 itg1val2 25915 itg1ge0 25917 itg11 25922 i1fadd 25926 i1fmul 25927 itg1addlem2 25928 itg1addlem4 25930 i1fres 25936 itg10a 25941 itg1ge0a 25942 itg1climres 25945 mbfi1fseqlem4 25949 itg2const2 25972 itg2gt0 25991 itg2cnlem2 25993 ftc1a 26267 ftc1lem4 26269 itgulm 26647 areaf 27201 cntnevol 34742 volmeas 34745 mblfinlem3 38411 mblfinlem4 38412 ismblfin 38413 voliunnfl 38416 volsupnfl 38417 itg2addnclem 38423 itg2addnclem2 38424 itg2gt0cn 38427 ftc1cnnclem 38443 ftc1anclem7 38451 areacirc 38465 arearect 44059 areaquad 44060 vol0 46790 volge0 46792 volsn 46798 volicc 46829 vonvol 47493 |
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