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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 3203 | . . . . 5 ⊢ 𝑥 ∈ V | |
2 | 1 | eldm2 5322 | . . . 4 ⊢ (𝑥 ∈ dom (𝐴 ↾ 𝐵) ↔ ∃𝑦〈𝑥, 𝑦〉 ∈ (𝐴 ↾ 𝐵)) |
3 | 19.41v 1914 | . . . . 5 ⊢ (∃𝑦(〈𝑥, 𝑦〉 ∈ 𝐴 ∧ 𝑥 ∈ 𝐵) ↔ (∃𝑦〈𝑥, 𝑦〉 ∈ 𝐴 ∧ 𝑥 ∈ 𝐵)) | |
4 | vex 3203 | . . . . . . 7 ⊢ 𝑦 ∈ V | |
5 | 4 | opelres 5401 | . . . . . 6 ⊢ (〈𝑥, 𝑦〉 ∈ (𝐴 ↾ 𝐵) ↔ (〈𝑥, 𝑦〉 ∈ 𝐴 ∧ 𝑥 ∈ 𝐵)) |
6 | 5 | exbii 1774 | . . . . 5 ⊢ (∃𝑦〈𝑥, 𝑦〉 ∈ (𝐴 ↾ 𝐵) ↔ ∃𝑦(〈𝑥, 𝑦〉 ∈ 𝐴 ∧ 𝑥 ∈ 𝐵)) |
7 | 1 | eldm2 5322 | . . . . . 6 ⊢ (𝑥 ∈ dom 𝐴 ↔ ∃𝑦〈𝑥, 𝑦〉 ∈ 𝐴) |
8 | 7 | anbi1i 731 | . . . . 5 ⊢ ((𝑥 ∈ dom 𝐴 ∧ 𝑥 ∈ 𝐵) ↔ (∃𝑦〈𝑥, 𝑦〉 ∈ 𝐴 ∧ 𝑥 ∈ 𝐵)) |
9 | 3, 6, 8 | 3bitr4i 292 | . . . 4 ⊢ (∃𝑦〈𝑥, 𝑦〉 ∈ (𝐴 ↾ 𝐵) ↔ (𝑥 ∈ dom 𝐴 ∧ 𝑥 ∈ 𝐵)) |
10 | 2, 9 | bitr2i 265 | . . 3 ⊢ ((𝑥 ∈ dom 𝐴 ∧ 𝑥 ∈ 𝐵) ↔ 𝑥 ∈ dom (𝐴 ↾ 𝐵)) |
11 | 10 | ineqri 3806 | . 2 ⊢ (dom 𝐴 ∩ 𝐵) = dom (𝐴 ↾ 𝐵) |
12 | incom 3805 | . 2 ⊢ (dom 𝐴 ∩ 𝐵) = (𝐵 ∩ dom 𝐴) | |
13 | 11, 12 | eqtr3i 2646 | 1 ⊢ dom (𝐴 ↾ 𝐵) = (𝐵 ∩ dom 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: ∧ wa 384 = wceq 1483 ∃wex 1704 ∈ wcel 1990 ∩ cin 3573 〈cop 4183 dom cdm 5114 ↾ cres 5116 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pr 4906 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ral 2917 df-rex 2918 df-rab 2921 df-v 3202 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-sn 4178 df-pr 4180 df-op 4184 df-br 4654 df-opab 4713 df-xp 5120 df-dm 5124 df-res 5126 |
This theorem is referenced by: ssdmres 5420 dmresexg 5421 dmressnsn 5438 eldmeldmressn 5440 imadisj 5484 imainrect 5575 dmresv 5593 resdmres 5625 coeq0 5644 funimacnv 5970 fnresdisj 6001 fnres 6007 fresaunres2 6076 nfvres 6224 ssimaex 6263 fnreseql 6327 respreima 6344 fveqressseq 6355 ffvresb 6394 fsnunfv 6453 funfvima 6492 funiunfv 6506 offres 7163 fnwelem 7292 ressuppss 7314 ressuppssdif 7316 smores 7449 smores3 7450 smores2 7451 tz7.44-2 7503 tz7.44-3 7504 frfnom 7530 sbthlem5 8074 sbthlem7 8076 domss2 8119 imafi 8259 ordtypelem4 8426 wdomima2g 8491 r0weon 8835 imadomg 9356 dmaddpi 9712 dmmulpi 9713 ltweuz 12760 dmhashres 13129 limsupgle 14208 fvsetsid 15890 setsdm 15892 setsfun 15893 setsfun0 15894 setsres 15901 lubdm 16979 glbdm 16992 gsumzaddlem 18321 dprdcntz2 18437 lmres 21104 imacmp 21200 qtoptop2 21502 kqdisj 21535 metreslem 22167 setsmstopn 22283 ismbl 23294 mbfres 23411 dvres3a 23678 cpnres 23700 dvlipcn 23757 dvlip2 23758 c1lip3 23762 dvcnvrelem1 23780 dvcvx 23783 dvlog 24397 uhgrspansubgrlem 26182 wlkres 26567 trlsegvdeglem4 27083 hlimcaui 28093 funresdm1 29416 ftc2re 30676 dfrdg2 31701 sltres 31815 nolesgn2ores 31825 nodense 31842 nosupres 31853 nosupbnd1lem1 31854 nosupbnd2lem1 31861 nosupbnd2 31862 caures 33556 ssbnd 33587 mapfzcons1 37280 diophrw 37322 eldioph2lem1 37323 eldioph2lem2 37324 rp-imass 38065 dmresss 39436 limsupresxr 39998 liminfresxr 39999 fourierdlem93 40416 fouriersw 40448 sssmf 40947 eldmressn 41203 fnresfnco 41206 afvres 41252 setrec2lem1 42440 |
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