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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 25485 | . . 3 ⊢ vol = (vol* ↾ dom vol) | |
| 2 | 1 | fveq1i 6835 | . 2 ⊢ (vol‘𝐴) = ((vol* ↾ dom vol)‘𝐴) |
| 3 | fvres 6853 | . 2 ⊢ (𝐴 ∈ dom vol → ((vol* ↾ dom vol)‘𝐴) = (vol*‘𝐴)) | |
| 4 | 2, 3 | eqtrid 2783 | 1 ⊢ (𝐴 ∈ dom vol → (vol‘𝐴) = (vol*‘𝐴)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1541 ∈ wcel 2113 dom cdm 5624 ↾ cres 5626 ‘cfv 6492 vol*covol 25419 volcvol 25420 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pr 5377 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-clab 2715 df-cleq 2728 df-clel 2811 df-ral 3052 df-rex 3061 df-rab 3400 df-v 3442 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-nul 4286 df-if 4480 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-br 5099 df-opab 5161 df-xp 5630 df-rel 5631 df-cnv 5632 df-dm 5634 df-rn 5635 df-res 5636 df-iota 6448 df-fv 6500 df-vol 25422 |
| This theorem is referenced by: volss 25490 volun 25502 volinun 25503 volfiniun 25504 voliunlem3 25509 volsup 25513 iccvolcl 25524 ovolioo 25525 volioo 25526 ioovolcl 25527 uniioovol 25536 uniioombllem4 25543 volcn 25563 volivth 25564 vitalilem4 25568 i1fima2 25636 i1fd 25638 i1f0rn 25639 itg1val2 25641 itg1ge0 25643 itg11 25648 i1fadd 25652 i1fmul 25653 itg1addlem2 25654 itg1addlem4 25656 i1fres 25662 itg10a 25667 itg1ge0a 25668 itg1climres 25671 mbfi1fseqlem4 25675 itg2const2 25698 itg2gt0 25717 itg2cnlem2 25719 ftc1a 26000 ftc1lem4 26002 itgulm 26373 areaf 26927 cntnevol 34385 volmeas 34388 mblfinlem3 37860 mblfinlem4 37861 ismblfin 37862 voliunnfl 37865 volsupnfl 37866 itg2addnclem 37872 itg2addnclem2 37873 itg2gt0cn 37876 ftc1cnnclem 37892 ftc1anclem7 37900 areacirc 37914 arearect 43467 areaquad 43468 vol0 46213 volge0 46215 volsn 46221 volicc 46252 vonvol 46916 |
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