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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 2821 | . . . . 5 ⊢ (Base‘𝐾) = (Base‘𝐾) | |
2 | eqid 2821 | . . . . 5 ⊢ (TopOpen‘𝐾) = (TopOpen‘𝐾) | |
3 | 1, 2 | istps 21525 | . . . 4 ⊢ (𝐾 ∈ TopSp ↔ (TopOpen‘𝐾) ∈ (TopOn‘(Base‘𝐾))) |
4 | resttopon2 21759 | . . . 4 ⊢ (((TopOpen‘𝐾) ∈ (TopOn‘(Base‘𝐾)) ∧ 𝐴 ∈ 𝑉) → ((TopOpen‘𝐾) ↾t 𝐴) ∈ (TopOn‘(𝐴 ∩ (Base‘𝐾)))) | |
5 | 3, 4 | sylanb 583 | . . 3 ⊢ ((𝐾 ∈ TopSp ∧ 𝐴 ∈ 𝑉) → ((TopOpen‘𝐾) ↾t 𝐴) ∈ (TopOn‘(𝐴 ∩ (Base‘𝐾)))) |
6 | eqid 2821 | . . . . . 6 ⊢ (𝐾 ↾s 𝐴) = (𝐾 ↾s 𝐴) | |
7 | 6, 1 | ressbas 16537 | . . . . 5 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ∩ (Base‘𝐾)) = (Base‘(𝐾 ↾s 𝐴))) |
8 | 7 | adantl 484 | . . . 4 ⊢ ((𝐾 ∈ TopSp ∧ 𝐴 ∈ 𝑉) → (𝐴 ∩ (Base‘𝐾)) = (Base‘(𝐾 ↾s 𝐴))) |
9 | 8 | fveq2d 6660 | . . 3 ⊢ ((𝐾 ∈ TopSp ∧ 𝐴 ∈ 𝑉) → (TopOn‘(𝐴 ∩ (Base‘𝐾))) = (TopOn‘(Base‘(𝐾 ↾s 𝐴)))) |
10 | 5, 9 | eleqtrd 2915 | . 2 ⊢ ((𝐾 ∈ TopSp ∧ 𝐴 ∈ 𝑉) → ((TopOpen‘𝐾) ↾t 𝐴) ∈ (TopOn‘(Base‘(𝐾 ↾s 𝐴)))) |
11 | eqid 2821 | . . 3 ⊢ (Base‘(𝐾 ↾s 𝐴)) = (Base‘(𝐾 ↾s 𝐴)) | |
12 | 6, 2 | resstopn 21777 | . . 3 ⊢ ((TopOpen‘𝐾) ↾t 𝐴) = (TopOpen‘(𝐾 ↾s 𝐴)) |
13 | 11, 12 | istps 21525 | . 2 ⊢ ((𝐾 ↾s 𝐴) ∈ TopSp ↔ ((TopOpen‘𝐾) ↾t 𝐴) ∈ (TopOn‘(Base‘(𝐾 ↾s 𝐴)))) |
14 | 10, 13 | sylibr 236 | 1 ⊢ ((𝐾 ∈ TopSp ∧ 𝐴 ∈ 𝑉) → (𝐾 ↾s 𝐴) ∈ TopSp) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = wceq 1537 ∈ wcel 2114 ∩ cin 3923 ‘cfv 6341 (class class class)co 7142 Basecbs 16466 ↾s cress 16467 ↾t crest 16677 TopOpenctopn 16678 TopOnctopon 21501 TopSpctps 21523 |
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-rep 5176 ax-sep 5189 ax-nul 5196 ax-pow 5252 ax-pr 5316 ax-un 7447 ax-cnex 10579 ax-resscn 10580 ax-1cn 10581 ax-icn 10582 ax-addcl 10583 ax-addrcl 10584 ax-mulcl 10585 ax-mulrcl 10586 ax-mulcom 10587 ax-addass 10588 ax-mulass 10589 ax-distr 10590 ax-i2m1 10591 ax-1ne0 10592 ax-1rid 10593 ax-rnegex 10594 ax-rrecex 10595 ax-cnre 10596 ax-pre-lttri 10597 ax-pre-lttrn 10598 ax-pre-ltadd 10599 ax-pre-mulgt0 10600 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3488 df-sbc 3764 df-csb 3872 df-dif 3927 df-un 3929 df-in 3931 df-ss 3940 df-pss 3942 df-nul 4280 df-if 4454 df-pw 4527 df-sn 4554 df-pr 4556 df-tp 4558 df-op 4560 df-uni 4825 df-int 4863 df-iun 4907 df-br 5053 df-opab 5115 df-mpt 5133 df-tr 5159 df-id 5446 df-eprel 5451 df-po 5460 df-so 5461 df-fr 5500 df-we 5502 df-xp 5547 df-rel 5548 df-cnv 5549 df-co 5550 df-dm 5551 df-rn 5552 df-res 5553 df-ima 5554 df-pred 6134 df-ord 6180 df-on 6181 df-lim 6182 df-suc 6183 df-iota 6300 df-fun 6343 df-fn 6344 df-f 6345 df-f1 6346 df-fo 6347 df-f1o 6348 df-fv 6349 df-riota 7100 df-ov 7145 df-oprab 7146 df-mpo 7147 df-om 7567 df-1st 7675 df-2nd 7676 df-wrecs 7933 df-recs 7994 df-rdg 8032 df-oadd 8092 df-er 8275 df-en 8496 df-dom 8497 df-sdom 8498 df-fin 8499 df-fi 8861 df-pnf 10663 df-mnf 10664 df-xr 10665 df-ltxr 10666 df-le 10667 df-sub 10858 df-neg 10859 df-nn 11625 df-2 11687 df-3 11688 df-4 11689 df-5 11690 df-6 11691 df-7 11692 df-8 11693 df-9 11694 df-ndx 16469 df-slot 16470 df-base 16472 df-sets 16473 df-ress 16474 df-tset 16567 df-rest 16679 df-topn 16680 df-topgen 16700 df-top 21485 df-topon 21502 df-topsp 21524 df-bases 21537 |
This theorem is referenced by: submtmd 22695 tsmssubm 22734 xrge0tsms 23425 xrge0tsmsd 30699 xrge0tps 31192 |
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