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Mirrors > Home > MPE Home > Th. List > cmsss | Structured version Visualization version GIF version |
Description: The restriction of a complete metric space is complete iff it is closed. (Contributed by Mario Carneiro, 15-Oct-2015.) |
Ref | Expression |
---|---|
cmsss.h | ⊢ 𝐾 = (𝑀 ↾s 𝐴) |
cmsss.x | ⊢ 𝑋 = (Base‘𝑀) |
cmsss.j | ⊢ 𝐽 = (TopOpen‘𝑀) |
Ref | Expression |
---|---|
cmsss | ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (𝐾 ∈ CMetSp ↔ 𝐴 ∈ (Clsd‘𝐽))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpr 486 | . . . . . . 7 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → 𝐴 ⊆ 𝑋) | |
2 | xpss12 5639 | . . . . . . 7 ⊢ ((𝐴 ⊆ 𝑋 ∧ 𝐴 ⊆ 𝑋) → (𝐴 × 𝐴) ⊆ (𝑋 × 𝑋)) | |
3 | 1, 2 | sylancom 589 | . . . . . 6 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (𝐴 × 𝐴) ⊆ (𝑋 × 𝑋)) |
4 | 3 | resabs1d 5958 | . . . . 5 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (((dist‘𝑀) ↾ (𝑋 × 𝑋)) ↾ (𝐴 × 𝐴)) = ((dist‘𝑀) ↾ (𝐴 × 𝐴))) |
5 | cmsss.x | . . . . . . . . . 10 ⊢ 𝑋 = (Base‘𝑀) | |
6 | 5 | fvexi 6843 | . . . . . . . . 9 ⊢ 𝑋 ∈ V |
7 | 6 | ssex 5269 | . . . . . . . 8 ⊢ (𝐴 ⊆ 𝑋 → 𝐴 ∈ V) |
8 | 7 | adantl 483 | . . . . . . 7 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → 𝐴 ∈ V) |
9 | cmsss.h | . . . . . . . 8 ⊢ 𝐾 = (𝑀 ↾s 𝐴) | |
10 | eqid 2737 | . . . . . . . 8 ⊢ (dist‘𝑀) = (dist‘𝑀) | |
11 | 9, 10 | ressds 17217 | . . . . . . 7 ⊢ (𝐴 ∈ V → (dist‘𝑀) = (dist‘𝐾)) |
12 | 8, 11 | syl 17 | . . . . . 6 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (dist‘𝑀) = (dist‘𝐾)) |
13 | 9, 5 | ressbas2 17046 | . . . . . . . 8 ⊢ (𝐴 ⊆ 𝑋 → 𝐴 = (Base‘𝐾)) |
14 | 13 | adantl 483 | . . . . . . 7 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → 𝐴 = (Base‘𝐾)) |
15 | 14 | sqxpeqd 5656 | . . . . . 6 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (𝐴 × 𝐴) = ((Base‘𝐾) × (Base‘𝐾))) |
16 | 12, 15 | reseq12d 5928 | . . . . 5 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → ((dist‘𝑀) ↾ (𝐴 × 𝐴)) = ((dist‘𝐾) ↾ ((Base‘𝐾) × (Base‘𝐾)))) |
17 | 4, 16 | eqtrd 2777 | . . . 4 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (((dist‘𝑀) ↾ (𝑋 × 𝑋)) ↾ (𝐴 × 𝐴)) = ((dist‘𝐾) ↾ ((Base‘𝐾) × (Base‘𝐾)))) |
18 | 14 | fveq2d 6833 | . . . 4 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (CMet‘𝐴) = (CMet‘(Base‘𝐾))) |
19 | 17, 18 | eleq12d 2832 | . . 3 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → ((((dist‘𝑀) ↾ (𝑋 × 𝑋)) ↾ (𝐴 × 𝐴)) ∈ (CMet‘𝐴) ↔ ((dist‘𝐾) ↾ ((Base‘𝐾) × (Base‘𝐾))) ∈ (CMet‘(Base‘𝐾)))) |
20 | eqid 2737 | . . . . . 6 ⊢ ((dist‘𝑀) ↾ (𝑋 × 𝑋)) = ((dist‘𝑀) ↾ (𝑋 × 𝑋)) | |
21 | 5, 20 | cmscmet 24615 | . . . . 5 ⊢ (𝑀 ∈ CMetSp → ((dist‘𝑀) ↾ (𝑋 × 𝑋)) ∈ (CMet‘𝑋)) |
22 | 21 | adantr 482 | . . . 4 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → ((dist‘𝑀) ↾ (𝑋 × 𝑋)) ∈ (CMet‘𝑋)) |
23 | eqid 2737 | . . . . 5 ⊢ (MetOpen‘((dist‘𝑀) ↾ (𝑋 × 𝑋))) = (MetOpen‘((dist‘𝑀) ↾ (𝑋 × 𝑋))) | |
24 | 23 | cmetss 24585 | . . . 4 ⊢ (((dist‘𝑀) ↾ (𝑋 × 𝑋)) ∈ (CMet‘𝑋) → ((((dist‘𝑀) ↾ (𝑋 × 𝑋)) ↾ (𝐴 × 𝐴)) ∈ (CMet‘𝐴) ↔ 𝐴 ∈ (Clsd‘(MetOpen‘((dist‘𝑀) ↾ (𝑋 × 𝑋)))))) |
25 | 22, 24 | syl 17 | . . 3 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → ((((dist‘𝑀) ↾ (𝑋 × 𝑋)) ↾ (𝐴 × 𝐴)) ∈ (CMet‘𝐴) ↔ 𝐴 ∈ (Clsd‘(MetOpen‘((dist‘𝑀) ↾ (𝑋 × 𝑋)))))) |
26 | 19, 25 | bitr3d 281 | . 2 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (((dist‘𝐾) ↾ ((Base‘𝐾) × (Base‘𝐾))) ∈ (CMet‘(Base‘𝐾)) ↔ 𝐴 ∈ (Clsd‘(MetOpen‘((dist‘𝑀) ↾ (𝑋 × 𝑋)))))) |
27 | cmsms 24617 | . . . 4 ⊢ (𝑀 ∈ CMetSp → 𝑀 ∈ MetSp) | |
28 | ressms 23787 | . . . . 5 ⊢ ((𝑀 ∈ MetSp ∧ 𝐴 ∈ V) → (𝑀 ↾s 𝐴) ∈ MetSp) | |
29 | 9, 28 | eqeltrid 2842 | . . . 4 ⊢ ((𝑀 ∈ MetSp ∧ 𝐴 ∈ V) → 𝐾 ∈ MetSp) |
30 | 27, 7, 29 | syl2an 597 | . . 3 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → 𝐾 ∈ MetSp) |
31 | eqid 2737 | . . . . 5 ⊢ (Base‘𝐾) = (Base‘𝐾) | |
32 | eqid 2737 | . . . . 5 ⊢ ((dist‘𝐾) ↾ ((Base‘𝐾) × (Base‘𝐾))) = ((dist‘𝐾) ↾ ((Base‘𝐾) × (Base‘𝐾))) | |
33 | 31, 32 | iscms 24614 | . . . 4 ⊢ (𝐾 ∈ CMetSp ↔ (𝐾 ∈ MetSp ∧ ((dist‘𝐾) ↾ ((Base‘𝐾) × (Base‘𝐾))) ∈ (CMet‘(Base‘𝐾)))) |
34 | 33 | baib 537 | . . 3 ⊢ (𝐾 ∈ MetSp → (𝐾 ∈ CMetSp ↔ ((dist‘𝐾) ↾ ((Base‘𝐾) × (Base‘𝐾))) ∈ (CMet‘(Base‘𝐾)))) |
35 | 30, 34 | syl 17 | . 2 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (𝐾 ∈ CMetSp ↔ ((dist‘𝐾) ↾ ((Base‘𝐾) × (Base‘𝐾))) ∈ (CMet‘(Base‘𝐾)))) |
36 | 27 | adantr 482 | . . . . 5 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → 𝑀 ∈ MetSp) |
37 | cmsss.j | . . . . . 6 ⊢ 𝐽 = (TopOpen‘𝑀) | |
38 | 37, 5, 20 | mstopn 23710 | . . . . 5 ⊢ (𝑀 ∈ MetSp → 𝐽 = (MetOpen‘((dist‘𝑀) ↾ (𝑋 × 𝑋)))) |
39 | 36, 38 | syl 17 | . . . 4 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → 𝐽 = (MetOpen‘((dist‘𝑀) ↾ (𝑋 × 𝑋)))) |
40 | 39 | fveq2d 6833 | . . 3 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (Clsd‘𝐽) = (Clsd‘(MetOpen‘((dist‘𝑀) ↾ (𝑋 × 𝑋))))) |
41 | 40 | eleq2d 2823 | . 2 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (𝐴 ∈ (Clsd‘𝐽) ↔ 𝐴 ∈ (Clsd‘(MetOpen‘((dist‘𝑀) ↾ (𝑋 × 𝑋)))))) |
42 | 26, 35, 41 | 3bitr4d 311 | 1 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (𝐾 ∈ CMetSp ↔ 𝐴 ∈ (Clsd‘𝐽))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 397 = wceq 1541 ∈ wcel 2106 Vcvv 3442 ⊆ wss 3901 × cxp 5622 ↾ cres 5626 ‘cfv 6483 (class class class)co 7341 Basecbs 17009 ↾s cress 17038 distcds 17068 TopOpenctopn 17229 MetOpencmopn 20692 Clsdccld 22272 MetSpcms 23576 CMetccmet 24523 CMetSpccms 24601 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2708 ax-rep 5233 ax-sep 5247 ax-nul 5254 ax-pow 5312 ax-pr 5376 ax-un 7654 ax-cnex 11032 ax-resscn 11033 ax-1cn 11034 ax-icn 11035 ax-addcl 11036 ax-addrcl 11037 ax-mulcl 11038 ax-mulrcl 11039 ax-mulcom 11040 ax-addass 11041 ax-mulass 11042 ax-distr 11043 ax-i2m1 11044 ax-1ne0 11045 ax-1rid 11046 ax-rnegex 11047 ax-rrecex 11048 ax-cnre 11049 ax-pre-lttri 11050 ax-pre-lttrn 11051 ax-pre-ltadd 11052 ax-pre-mulgt0 11053 ax-pre-sup 11054 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2729 df-clel 2815 df-nfc 2887 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3350 df-reu 3351 df-rab 3405 df-v 3444 df-sbc 3731 df-csb 3847 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-pss 3920 df-nul 4274 df-if 4478 df-pw 4553 df-sn 4578 df-pr 4580 df-op 4584 df-uni 4857 df-int 4899 df-iun 4947 df-iin 4948 df-br 5097 df-opab 5159 df-mpt 5180 df-tr 5214 df-id 5522 df-eprel 5528 df-po 5536 df-so 5537 df-fr 5579 df-we 5581 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-pred 6242 df-ord 6309 df-on 6310 df-lim 6311 df-suc 6312 df-iota 6435 df-fun 6485 df-fn 6486 df-f 6487 df-f1 6488 df-fo 6489 df-f1o 6490 df-fv 6491 df-riota 7297 df-ov 7344 df-oprab 7345 df-mpo 7346 df-om 7785 df-1st 7903 df-2nd 7904 df-frecs 8171 df-wrecs 8202 df-recs 8276 df-rdg 8315 df-1o 8371 df-er 8573 df-map 8692 df-en 8809 df-dom 8810 df-sdom 8811 df-fin 8812 df-fi 9272 df-sup 9303 df-inf 9304 df-pnf 11116 df-mnf 11117 df-xr 11118 df-ltxr 11119 df-le 11120 df-sub 11312 df-neg 11313 df-div 11738 df-nn 12079 df-2 12141 df-3 12142 df-4 12143 df-5 12144 df-6 12145 df-7 12146 df-8 12147 df-9 12148 df-n0 12339 df-z 12425 df-dec 12543 df-uz 12688 df-q 12794 df-rp 12836 df-xneg 12953 df-xadd 12954 df-xmul 12955 df-ico 13190 df-icc 13191 df-sets 16962 df-slot 16980 df-ndx 16992 df-base 17010 df-ress 17039 df-tset 17078 df-ds 17081 df-rest 17230 df-topn 17231 df-topgen 17251 df-psmet 20694 df-xmet 20695 df-met 20696 df-bl 20697 df-mopn 20698 df-fbas 20699 df-fg 20700 df-top 22148 df-topon 22165 df-topsp 22187 df-bases 22201 df-cld 22275 df-ntr 22276 df-cls 22277 df-nei 22354 df-haus 22571 df-fil 23102 df-flim 23195 df-xms 23578 df-ms 23579 df-cfil 24524 df-cmet 24526 df-cms 24604 |
This theorem is referenced by: lssbn 24621 resscdrg 24627 srabn 24629 ishl2 24639 recms 24649 pjthlem2 24707 |
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