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Mirrors > Home > MPE Home > Th. List > elrestr | Structured version Visualization version GIF version |
Description: Sufficient condition for being an open set in a subspace. (Contributed by Jeff Hankins, 11-Jul-2009.) (Revised by Mario Carneiro, 15-Dec-2013.) |
Ref | Expression |
---|---|
elrestr | ⊢ ((𝐽 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊 ∧ 𝐴 ∈ 𝐽) → (𝐴 ∩ 𝑆) ∈ (𝐽 ↾t 𝑆)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2738 | . . . 4 ⊢ (𝐴 ∩ 𝑆) = (𝐴 ∩ 𝑆) | |
2 | ineq1 4094 | . . . . 5 ⊢ (𝑥 = 𝐴 → (𝑥 ∩ 𝑆) = (𝐴 ∩ 𝑆)) | |
3 | 2 | rspceeqv 3539 | . . . 4 ⊢ ((𝐴 ∈ 𝐽 ∧ (𝐴 ∩ 𝑆) = (𝐴 ∩ 𝑆)) → ∃𝑥 ∈ 𝐽 (𝐴 ∩ 𝑆) = (𝑥 ∩ 𝑆)) |
4 | 1, 3 | mpan2 691 | . . 3 ⊢ (𝐴 ∈ 𝐽 → ∃𝑥 ∈ 𝐽 (𝐴 ∩ 𝑆) = (𝑥 ∩ 𝑆)) |
5 | elrest 16797 | . . 3 ⊢ ((𝐽 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → ((𝐴 ∩ 𝑆) ∈ (𝐽 ↾t 𝑆) ↔ ∃𝑥 ∈ 𝐽 (𝐴 ∩ 𝑆) = (𝑥 ∩ 𝑆))) | |
6 | 4, 5 | syl5ibr 249 | . 2 ⊢ ((𝐽 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → (𝐴 ∈ 𝐽 → (𝐴 ∩ 𝑆) ∈ (𝐽 ↾t 𝑆))) |
7 | 6 | 3impia 1118 | 1 ⊢ ((𝐽 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊 ∧ 𝐴 ∈ 𝐽) → (𝐴 ∩ 𝑆) ∈ (𝐽 ↾t 𝑆)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 399 ∧ w3a 1088 = wceq 1542 ∈ wcel 2113 ∃wrex 3054 ∩ cin 3840 (class class class)co 7164 ↾t crest 16790 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1916 ax-6 1974 ax-7 2019 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2161 ax-12 2178 ax-ext 2710 ax-rep 5151 ax-sep 5164 ax-nul 5171 ax-pr 5293 ax-un 7473 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 847 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2540 df-eu 2570 df-clab 2717 df-cleq 2730 df-clel 2811 df-nfc 2881 df-ne 2935 df-ral 3058 df-rex 3059 df-reu 3060 df-rab 3062 df-v 3399 df-sbc 3680 df-csb 3789 df-dif 3844 df-un 3846 df-in 3848 df-ss 3858 df-nul 4210 df-if 4412 df-sn 4514 df-pr 4516 df-op 4520 df-uni 4794 df-iun 4880 df-br 5028 df-opab 5090 df-mpt 5108 df-id 5425 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-res 5531 df-ima 5532 df-iota 6291 df-fun 6335 df-fn 6336 df-f 6337 df-f1 6338 df-fo 6339 df-f1o 6340 df-fv 6341 df-ov 7167 df-oprab 7168 df-mpo 7169 df-rest 16792 |
This theorem is referenced by: firest 16802 restbas 21902 tgrest 21903 resttopon 21905 restcld 21916 restfpw 21923 neitr 21924 restntr 21926 ordtrest 21946 cnrest 22029 lmss 22042 connsubclo 22168 restnlly 22226 islly2 22228 cldllycmp 22239 lly1stc 22240 kgenss 22287 xkococnlem 22403 xkoinjcn 22431 qtoprest 22461 trfbas2 22587 trfil1 22630 trfil2 22631 fgtr 22634 trfg 22635 uzrest 22641 trufil 22654 flimrest 22727 cnextcn 22811 trust 22974 restutop 22982 trcfilu 23039 cfiluweak 23040 xrsmopn 23557 zdis 23561 xrge0tsms 23579 cnheibor 23700 cfilres 24041 lhop2 24759 psercn 25165 xrlimcnp 25698 xrge0tsmsd 30886 ordtrestNEW 31435 pnfneige0 31465 lmxrge0 31466 rrhre 31533 cvmscld 32798 cvmopnlem 32803 cvmliftmolem1 32806 poimirlem30 35419 subspopn 35522 iocopn 42582 icoopn 42587 limcresiooub 42709 limcresioolb 42710 fourierdlem32 43206 fourierdlem33 43207 fourierdlem48 43221 fourierdlem49 43222 i0oii 45719 io1ii 45720 iscnrm3llem2 45750 |
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