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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 3497 | . . . . 5 ⊢ 𝑥 ∈ V | |
2 | 1 | eldm2 5770 | . . . 4 ⊢ (𝑥 ∈ dom (𝐴 ↾ 𝐵) ↔ ∃𝑦〈𝑥, 𝑦〉 ∈ (𝐴 ↾ 𝐵)) |
3 | 19.42v 1954 | . . . . 5 ⊢ (∃𝑦(𝑥 ∈ 𝐵 ∧ 〈𝑥, 𝑦〉 ∈ 𝐴) ↔ (𝑥 ∈ 𝐵 ∧ ∃𝑦〈𝑥, 𝑦〉 ∈ 𝐴)) | |
4 | vex 3497 | . . . . . . 7 ⊢ 𝑦 ∈ V | |
5 | 4 | opelresi 5861 | . . . . . 6 ⊢ (〈𝑥, 𝑦〉 ∈ (𝐴 ↾ 𝐵) ↔ (𝑥 ∈ 𝐵 ∧ 〈𝑥, 𝑦〉 ∈ 𝐴)) |
6 | 5 | exbii 1848 | . . . . 5 ⊢ (∃𝑦〈𝑥, 𝑦〉 ∈ (𝐴 ↾ 𝐵) ↔ ∃𝑦(𝑥 ∈ 𝐵 ∧ 〈𝑥, 𝑦〉 ∈ 𝐴)) |
7 | 1 | eldm2 5770 | . . . . . 6 ⊢ (𝑥 ∈ dom 𝐴 ↔ ∃𝑦〈𝑥, 𝑦〉 ∈ 𝐴) |
8 | 7 | anbi2i 624 | . . . . 5 ⊢ ((𝑥 ∈ 𝐵 ∧ 𝑥 ∈ dom 𝐴) ↔ (𝑥 ∈ 𝐵 ∧ ∃𝑦〈𝑥, 𝑦〉 ∈ 𝐴)) |
9 | 3, 6, 8 | 3bitr4i 305 | . . . 4 ⊢ (∃𝑦〈𝑥, 𝑦〉 ∈ (𝐴 ↾ 𝐵) ↔ (𝑥 ∈ 𝐵 ∧ 𝑥 ∈ dom 𝐴)) |
10 | 2, 9 | bitr2i 278 | . . 3 ⊢ ((𝑥 ∈ 𝐵 ∧ 𝑥 ∈ dom 𝐴) ↔ 𝑥 ∈ dom (𝐴 ↾ 𝐵)) |
11 | 10 | ineqri 4180 | . 2 ⊢ (𝐵 ∩ dom 𝐴) = dom (𝐴 ↾ 𝐵) |
12 | 11 | eqcomi 2830 | 1 ⊢ dom (𝐴 ↾ 𝐵) = (𝐵 ∩ dom 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: ∧ wa 398 = wceq 1537 ∃wex 1780 ∈ wcel 2114 ∩ cin 3935 〈cop 4573 dom cdm 5555 ↾ cres 5557 |
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 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pr 5330 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3496 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-if 4468 df-sn 4568 df-pr 4570 df-op 4574 df-br 5067 df-opab 5129 df-xp 5561 df-dm 5565 df-res 5567 |
This theorem is referenced by: ssdmres 5876 dmresexg 5877 dmressnsn 5894 eldmeldmressn 5896 imadisj 5948 imainrect 6038 dmresv 6057 resdmres 6089 coeq0 6108 funimacnv 6435 fnresdisj 6467 fnres 6474 fresaunres2 6550 nfvres 6706 ssimaex 6748 fnreseql 6818 respreima 6836 fveqressseq 6847 ffvresb 6888 fsnunfv 6949 funfvima 6992 funiunfv 7007 offres 7684 fnwelem 7825 ressuppss 7849 ressuppssdif 7851 smores 7989 smores3 7990 smores2 7991 tz7.44-2 8043 tz7.44-3 8044 frfnom 8070 sbthlem5 8631 sbthlem7 8633 domss2 8676 imafi 8817 ordtypelem4 8985 wdomima2g 9050 r0weon 9438 imadomg 9956 dmaddpi 10312 dmmulpi 10313 ltweuz 13330 dmhashres 13702 limsupgle 14834 fvsetsid 16515 setsdm 16517 setsfun 16518 setsfun0 16519 setsres 16525 lubdm 17589 glbdm 17602 gsumzaddlem 19041 dprdcntz2 19160 lmres 21908 imacmp 22005 qtoptop2 22307 kqdisj 22340 metreslem 22972 setsmstopn 23088 ismbl 24127 mbfres 24245 dvres3a 24512 cpnres 24534 dvlipcn 24591 dvlip2 24592 c1lip3 24596 dvcnvrelem1 24614 dvcvx 24617 dvlog 25234 uhgrspansubgrlem 27072 trlsegvdeglem4 28002 hlimcaui 29013 funresdm1 30355 ftc2re 31869 dfrdg2 33040 frrlem11 33133 frrlem12 33134 sltres 33169 nolesgn2ores 33179 nodense 33196 nosupres 33207 nosupbnd1lem1 33208 nosupbnd2lem1 33215 nosupbnd2 33216 bj-fvsnun2 34541 caures 35050 ssbnd 35081 mapfzcons1 39334 diophrw 39376 eldioph2lem1 39377 eldioph2lem2 39378 rp-imass 40137 dmresss 41521 limsupresxr 42067 liminfresxr 42068 fourierdlem93 42504 fouriersw 42536 sssmf 43035 eldmressn 43292 fnresfnco 43296 afvres 43391 afv2res 43458 setrec2lem1 44816 |
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