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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 25904 | . . 3 ⊢ vol = (vol* ↾ dom vol) | |
| 2 | 1 | fveq1i 6917 | . 2 ⊢ (vol‘𝐴) = ((vol* ↾ dom vol)‘𝐴) |
| 3 | fvres 6935 | . 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 |
| This proof depends on syntax axioms: → wi 4 = wceq 1570 ∈ wcel 2147 dom cdm 5658 ↾ cres 5660 ‘cfv 6566 vol*covol 25838 volcvol 25839 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 ax-sep 5255 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 2102 df-clab 2742 df-cleq 2755 df-clel 2839 df-ral 3081 df-rex 3091 df-rab 3417 df-v 3456 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-br 5109 df-opab 5174 df-xp 5664 df-rel 5665 df-cnv 5666 df-dm 5668 df-rn 5669 df-res 5670 df-iota 6520 df-fv 6574 df-vol 25841 |
| This theorem is used by: volss 25909 volun 25921 volinun 25922 volfiniun 25923 voliunlem3 25928 volsup 25932 iccvolcl 25943 ovolioo 25944 volioo 25945 ioovolcl 25946 uniioovol 25955 uniioombllem4 25962 volcn 25982 volivth 25983 vitalilem4 25987 i1fima2 26055 i1fd 26057 i1f0rn 26058 itg1val2 26060 itg1ge0 26062 itg11 26067 i1fadd 26071 i1fmul 26072 itg1addlem2 26073 itg1addlem4 26075 i1fres 26081 itg10a 26086 itg1ge0a 26087 itg1climres 26090 mbfi1fseqlem4 26094 itg2const2 26117 itg2gt0 26136 itg2cnlem2 26138 ftc1a 26412 ftc1lem4 26414 itgulm 26792 areaf 27346 cntnevol 34972 volmeas 34975 mblfinlem3 38845 mblfinlem4 38846 ismblfin 38847 voliunnfl 38850 volsupnfl 38851 itg2addnclem 38857 itg2addnclem2 38858 itg2gt0cn 38861 ftc1cnnclem 38877 ftc1anclem7 38885 areacirc 38899 arearect 44478 areaquad 44479 vol0 47242 volge0 47244 volsn 47250 volicc 47281 vonvol 47945 |
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