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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 25687 | . . 3 ⊢ vol = (vol* ↾ dom vol) | |
| 2 | 1 | fveq1i 6882 | . 2 ⊢ (vol‘𝐴) = ((vol* ↾ dom vol)‘𝐴) |
| 3 | fvres 6900 | . 2 ⊢ (𝐴 ∈ dom vol → ((vol* ↾ dom vol)‘𝐴) = (vol*‘𝐴)) | |
| 4 | 2, 3 | eqtrid 2810 | 1 ⊢ (𝐴 ∈ dom vol → (vol‘𝐴) = (vol*‘𝐴)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1570 ∈ wcel 2143 dom cdm 5661 ↾ cres 5663 ‘cfv 6536 vol*covol 25621 volcvol 25622 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-ext 2735 ax-sep 5257 ax-pr 5404 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-sb 2097 df-clab 2742 df-cleq 2755 df-clel 2838 df-ral 3080 df-rex 3090 df-rab 3417 df-v 3457 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-nul 4287 df-if 4488 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4873 df-br 5110 df-opab 5174 df-xp 5667 df-rel 5668 df-cnv 5669 df-dm 5671 df-rn 5672 df-res 5673 df-iota 6492 df-fv 6544 df-vol 25624 |
| This theorem is referenced by: volss 25692 volun 25704 volinun 25705 volfiniun 25706 voliunlem3 25711 volsup 25715 iccvolcl 25726 ovolioo 25727 volioo 25728 ioovolcl 25729 uniioovol 25738 uniioombllem4 25745 volcn 25765 volivth 25766 vitalilem4 25770 i1fima2 25838 i1fd 25840 i1f0rn 25841 itg1val2 25843 itg1ge0 25845 itg11 25850 i1fadd 25854 i1fmul 25855 itg1addlem2 25856 itg1addlem4 25858 i1fres 25864 itg10a 25869 itg1ge0a 25870 itg1climres 25873 mbfi1fseqlem4 25877 itg2const2 25900 itg2gt0 25919 itg2cnlem2 25921 ftc1a 26196 ftc1lem4 26198 itgulm 26571 areaf 27126 cntnevol 34618 volmeas 34621 mblfinlem3 38330 mblfinlem4 38331 ismblfin 38332 voliunnfl 38335 volsupnfl 38336 itg2addnclem 38342 itg2addnclem2 38343 itg2gt0cn 38346 ftc1cnnclem 38362 ftc1anclem7 38370 areacirc 38384 arearect 43962 areaquad 43963 vol0 46693 volge0 46695 volsn 46701 volicc 46732 vonvol 47396 |
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