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| Mirrors > Home > MPE Home > Th. List > resstps | Structured version Visualization version GIF version | ||
| Description: A restricted topological space is a topological space. Note that this theorem would not be true if TopSp was defined directly in terms of the TopSet slot instead of the TopOpen derived function. (Contributed by Mario Carneiro, 13-Aug-2015.) |
| Ref | Expression |
|---|---|
| resstps | ⊢ ((𝐾 ∈ TopSp ∧ 𝐴 ∈ 𝑉) → (𝐾 ↾s 𝐴) ∈ TopSp) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2765 | . . . . 5 ⊢ (Base‘𝐾) = (Base‘𝐾) | |
| 2 | eqid 2765 | . . . . 5 ⊢ (TopOpen‘𝐾) = (TopOpen‘𝐾) | |
| 3 | 1, 2 | istps 23048 | . . . 4 ⊢ (𝐾 ∈ TopSp ↔ (TopOpen‘𝐾) ∈ (TopOn‘(Base‘𝐾))) |
| 4 | resttopon2 23282 | . . . 4 ⊢ (((TopOpen‘𝐾) ∈ (TopOn‘(Base‘𝐾)) ∧ 𝐴 ∈ 𝑉) → ((TopOpen‘𝐾) ↾t 𝐴) ∈ (TopOn‘(𝐴 ∩ (Base‘𝐾)))) | |
| 5 | 3, 4 | sylanb 592 | . . 3 ⊢ ((𝐾 ∈ TopSp ∧ 𝐴 ∈ 𝑉) → ((TopOpen‘𝐾) ↾t 𝐴) ∈ (TopOn‘(𝐴 ∩ (Base‘𝐾)))) |
| 6 | eqid 2765 | . . . . . 6 ⊢ (𝐾 ↾s 𝐴) = (𝐾 ↾s 𝐴) | |
| 7 | 6, 1 | ressbas 17284 | . . . . 5 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ∩ (Base‘𝐾)) = (Base‘(𝐾 ↾s 𝐴))) |
| 8 | 7 | adantl 486 | . . . 4 ⊢ ((𝐾 ∈ TopSp ∧ 𝐴 ∈ 𝑉) → (𝐴 ∩ (Base‘𝐾)) = (Base‘(𝐾 ↾s 𝐴))) |
| 9 | 8 | fveq2d 6875 | . . 3 ⊢ ((𝐾 ∈ TopSp ∧ 𝐴 ∈ 𝑉) → (TopOn‘(𝐴 ∩ (Base‘𝐾))) = (TopOn‘(Base‘(𝐾 ↾s 𝐴)))) |
| 10 | 5, 9 | eleqtrd 2867 | . 2 ⊢ ((𝐾 ∈ TopSp ∧ 𝐴 ∈ 𝑉) → ((TopOpen‘𝐾) ↾t 𝐴) ∈ (TopOn‘(Base‘(𝐾 ↾s 𝐴)))) |
| 11 | eqid 2765 | . . 3 ⊢ (Base‘(𝐾 ↾s 𝐴)) = (Base‘(𝐾 ↾s 𝐴)) | |
| 12 | 6, 2 | resstopn 23300 | . . 3 ⊢ ((TopOpen‘𝐾) ↾t 𝐴) = (TopOpen‘(𝐾 ↾s 𝐴)) |
| 13 | 11, 12 | istps 23048 | . 2 ⊢ ((𝐾 ↾s 𝐴) ∈ TopSp ↔ ((TopOpen‘𝐾) ↾t 𝐴) ∈ (TopOn‘(Base‘(𝐾 ↾s 𝐴)))) |
| 14 | 10, 13 | sylibr 237 | 1 ⊢ ((𝐾 ∈ TopSp ∧ 𝐴 ∈ 𝑉) → (𝐾 ↾s 𝐴) ∈ TopSp) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 = wceq 1563 ∈ wcel 2145 ∩ cin 3906 ‘cfv 6525 (class class class)co 7400 Basecbs 17257 ↾s cress 17278 ↾t crest 17461 TopOpenctopn 17462 TopOnctopon 23024 TopSpctps 23046 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2737 ax-rep 5231 ax-sep 5250 ax-nul 5260 ax-pow 5326 ax-pr 5394 ax-un 7722 ax-cnex 11144 ax-resscn 11145 ax-1cn 11146 ax-icn 11147 ax-addcl 11148 ax-addrcl 11149 ax-mulcl 11150 ax-mulrcl 11151 ax-mulcom 11152 ax-addass 11153 ax-mulass 11154 ax-distr 11155 ax-i2m1 11156 ax-1ne0 11157 ax-1rid 11158 ax-rnegex 11159 ax-rrecex 11160 ax-cnre 11161 ax-pre-lttri 11162 ax-pre-lttrn 11163 ax-pre-ltadd 11164 ax-pre-mulgt0 11165 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1566 df-fal 1576 df-ex 1803 df-nf 1807 df-sb 2094 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3065 df-ral 3080 df-rex 3090 df-reu 3371 df-rab 3418 df-v 3459 df-sbc 3748 df-csb 3856 df-dif 3910 df-un 3912 df-in 3914 df-ss 3924 df-pss 3927 df-nul 4289 df-if 4484 df-pw 4560 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4868 df-int 4908 df-iun 4953 df-br 5105 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6291 df-ord 6352 df-on 6353 df-lim 6354 df-suc 6355 df-iota 6481 df-fun 6527 df-fn 6528 df-f 6529 df-f1 6530 df-fo 6531 df-f1o 6532 df-fv 6533 df-riota 7357 df-ov 7403 df-oprab 7404 df-mpo 7405 df-om 7851 df-1st 7974 df-2nd 7975 df-frecs 8266 df-wrecs 8297 df-recs 8346 df-rdg 8385 df-er 8682 df-en 8932 df-dom 8933 df-sdom 8934 df-fin 8935 df-fi 9359 df-pnf 11233 df-mnf 11234 df-xr 11235 df-ltxr 11236 df-le 11237 df-sub 11431 df-neg 11432 df-nn 12222 df-2 12291 df-3 12292 df-4 12293 df-5 12294 df-6 12295 df-7 12296 df-8 12297 df-9 12298 df-sets 17212 df-slot 17230 df-ndx 17242 df-base 17258 df-ress 17279 df-tset 17317 df-rest 17463 df-topn 17464 df-topgen 17484 df-top 23008 df-topon 23025 df-topsp 23047 df-bases 23060 |
| This theorem is referenced by: submtmd 24218 tsmssubm 24257 xrge0tsms 24949 xrge0tsmsd 33301 xrge0tps 34244 |
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