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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 25740 | . . 3 ⊢ vol = (vol* ↾ dom vol) | |
| 2 | 1 | fveq1i 6886 | . 2 ⊢ (vol‘𝐴) = ((vol* ↾ dom vol)‘𝐴) |
| 3 | fvres 6904 | . 2 ⊢ (𝐴 ∈ dom vol → ((vol* ↾ dom vol)‘𝐴) = (vol*‘𝐴)) | |
| 4 | 2, 3 | eqtrid 2812 | 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 2146 dom cdm 5663 ↾ cres 5665 ‘cfv 6540 vol*covol 25674 volcvol 25675 |
| 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 2148 ax-9 2156 ax-ext 2737 ax-sep 5259 ax-pr 5406 |
| 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 2744 df-cleq 2757 df-clel 2840 df-ral 3082 df-rex 3092 df-rab 3419 df-v 3459 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4287 df-if 4490 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-br 5112 df-opab 5176 df-xp 5669 df-rel 5670 df-cnv 5671 df-dm 5673 df-rn 5674 df-res 5675 df-iota 6496 df-fv 6548 df-vol 25677 |
| This theorem is used by: volss 25745 volun 25757 volinun 25758 volfiniun 25759 voliunlem3 25764 volsup 25768 iccvolcl 25779 ovolioo 25780 volioo 25781 ioovolcl 25782 uniioovol 25791 uniioombllem4 25798 volcn 25818 volivth 25819 vitalilem4 25823 i1fima2 25891 i1fd 25893 i1f0rn 25894 itg1val2 25896 itg1ge0 25898 itg11 25903 i1fadd 25907 i1fmul 25908 itg1addlem2 25909 itg1addlem4 25911 i1fres 25917 itg10a 25922 itg1ge0a 25923 itg1climres 25926 mbfi1fseqlem4 25930 itg2const2 25953 itg2gt0 25972 itg2cnlem2 25974 ftc1a 26249 ftc1lem4 26251 itgulm 26624 areaf 27179 cntnevol 34685 volmeas 34688 mblfinlem3 38369 mblfinlem4 38370 ismblfin 38371 voliunnfl 38374 volsupnfl 38375 itg2addnclem 38381 itg2addnclem2 38382 itg2gt0cn 38385 ftc1cnnclem 38401 ftc1anclem7 38409 areacirc 38423 arearect 44002 areaquad 44003 vol0 46733 volge0 46735 volsn 46741 volicc 46772 vonvol 47436 |
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