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Mirrors > Home > MPE Home > Th. List > dmres | Structured version Visualization version GIF version |
Description: The domain of a restriction. Exercise 14 of [TakeutiZaring] p. 25. (Contributed by NM, 1-Aug-1994.) |
Ref | Expression |
---|---|
dmres | ⊢ dom (𝐴 ↾ 𝐵) = (𝐵 ∩ dom 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | vex 3402 | . . . . 5 ⊢ 𝑥 ∈ V | |
2 | 1 | eldm2 5755 | . . . 4 ⊢ (𝑥 ∈ dom (𝐴 ↾ 𝐵) ↔ ∃𝑦〈𝑥, 𝑦〉 ∈ (𝐴 ↾ 𝐵)) |
3 | 19.42v 1962 | . . . . 5 ⊢ (∃𝑦(𝑥 ∈ 𝐵 ∧ 〈𝑥, 𝑦〉 ∈ 𝐴) ↔ (𝑥 ∈ 𝐵 ∧ ∃𝑦〈𝑥, 𝑦〉 ∈ 𝐴)) | |
4 | vex 3402 | . . . . . . 7 ⊢ 𝑦 ∈ V | |
5 | 4 | opelresi 5844 | . . . . . 6 ⊢ (〈𝑥, 𝑦〉 ∈ (𝐴 ↾ 𝐵) ↔ (𝑥 ∈ 𝐵 ∧ 〈𝑥, 𝑦〉 ∈ 𝐴)) |
6 | 5 | exbii 1855 | . . . . 5 ⊢ (∃𝑦〈𝑥, 𝑦〉 ∈ (𝐴 ↾ 𝐵) ↔ ∃𝑦(𝑥 ∈ 𝐵 ∧ 〈𝑥, 𝑦〉 ∈ 𝐴)) |
7 | 1 | eldm2 5755 | . . . . . 6 ⊢ (𝑥 ∈ dom 𝐴 ↔ ∃𝑦〈𝑥, 𝑦〉 ∈ 𝐴) |
8 | 7 | anbi2i 626 | . . . . 5 ⊢ ((𝑥 ∈ 𝐵 ∧ 𝑥 ∈ dom 𝐴) ↔ (𝑥 ∈ 𝐵 ∧ ∃𝑦〈𝑥, 𝑦〉 ∈ 𝐴)) |
9 | 3, 6, 8 | 3bitr4i 306 | . . . 4 ⊢ (∃𝑦〈𝑥, 𝑦〉 ∈ (𝐴 ↾ 𝐵) ↔ (𝑥 ∈ 𝐵 ∧ 𝑥 ∈ dom 𝐴)) |
10 | 2, 9 | bitr2i 279 | . . 3 ⊢ ((𝑥 ∈ 𝐵 ∧ 𝑥 ∈ dom 𝐴) ↔ 𝑥 ∈ dom (𝐴 ↾ 𝐵)) |
11 | 10 | ineqri 4105 | . 2 ⊢ (𝐵 ∩ dom 𝐴) = dom (𝐴 ↾ 𝐵) |
12 | 11 | eqcomi 2745 | 1 ⊢ dom (𝐴 ↾ 𝐵) = (𝐵 ∩ dom 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: ∧ wa 399 = wceq 1543 ∃wex 1787 ∈ wcel 2112 ∩ cin 3852 〈cop 4533 dom cdm 5536 ↾ cres 5538 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2018 ax-8 2114 ax-9 2122 ax-ext 2708 ax-sep 5177 ax-nul 5184 ax-pr 5307 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-sb 2073 df-clab 2715 df-cleq 2728 df-clel 2809 df-ral 3056 df-rex 3057 df-rab 3060 df-v 3400 df-dif 3856 df-un 3858 df-in 3860 df-nul 4224 df-if 4426 df-sn 4528 df-pr 4530 df-op 4534 df-br 5040 df-opab 5102 df-xp 5542 df-dm 5546 df-res 5548 |
This theorem is referenced by: ssdmres 5859 dmresexg 5860 dmressnsn 5878 eldmeldmressn 5880 imadisj 5933 imainrect 6024 dmresv 6043 resdmres 6075 resdmss 6078 coeq0 6099 resssxp 6113 funimacnv 6439 fnresdisj 6475 fnres 6482 fresaunres2 6569 nfvres 6731 ssimaex 6774 fnreseql 6846 respreima 6864 fveqressseq 6878 ffvresb 6919 fsnunfv 6980 funfvima 7024 funiunfv 7039 offres 7734 fnwelem 7876 ressuppss 7903 ressuppssdif 7905 frrlem11 8015 frrlem12 8016 smores 8067 smores3 8068 smores2 8069 tz7.44-2 8121 tz7.44-3 8122 frfnom 8148 sbthlem5 8738 sbthlem7 8740 domss2 8783 imafiOLD 8947 ordtypelem4 9115 wdomima2g 9180 r0weon 9591 imadomg 10113 dmaddpi 10469 dmmulpi 10470 ltweuz 13499 dmhashres 13872 limsupgle 15003 fvsetsid 16697 setsdm 16699 setsfun 16700 setsfun0 16701 setsres 16707 lubdm 17811 glbdm 17824 gsumzaddlem 19260 dprdcntz2 19379 lmres 22151 imacmp 22248 qtoptop2 22550 kqdisj 22583 metreslem 23214 setsmstopn 23330 ismbl 24377 mbfres 24495 dvres3a 24765 cpnres 24788 dvlipcn 24845 dvlip2 24846 c1lip3 24850 dvcnvrelem1 24868 dvcvx 24871 dvlog 25493 uhgrspansubgrlem 27332 trlsegvdeglem4 28260 hlimcaui 29271 funresdm1 30617 ftc2re 32244 snres0 33344 dfrdg2 33441 sltres 33551 nolesgn2ores 33561 nogesgn1ores 33563 nodense 33581 nosupres 33596 nosupbnd1lem1 33597 nosupbnd2lem1 33604 nosupbnd2 33605 noinfres 33611 noinfbnd1lem1 33612 noinfbnd2lem1 33619 noetasuplem2 33623 noetainflem2 33627 bj-fvsnun2 35111 caures 35604 ssbnd 35632 mapfzcons1 40183 diophrw 40225 eldioph2lem1 40226 eldioph2lem2 40227 dmresss 42388 limsupresxr 42925 liminfresxr 42926 fourierdlem93 43358 fouriersw 43390 sssmf 43889 eldmressn 44146 fnresfnco 44150 afvres 44279 afv2res 44346 |
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