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Theorem cmsss 23946

Description: The restriction of a complete metric space is complete iff it is closed. (Contributed by Mario Carneiro, 15-Oct-2015.)

**Hypotheses**
Ref	Expression
cmsss.h	⊢ 𝐾 = (𝑀 ↾_s 𝐴)
cmsss.x	⊢ 𝑋 = (Base‘𝑀)
cmsss.j	⊢ 𝐽 = (TopOpen‘𝑀)

**Assertion**
Ref	Expression
cmsss	⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (𝐾 ∈ CMetSp ↔ 𝐴 ∈ (Clsd‘𝐽)))

**Proof of Theorem cmsss**
Step	Hyp	Ref	Expression
1		simpr 487	. . . . . . 7 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → 𝐴 ⊆ 𝑋)
2		xpss12 5563	. . . . . . 7 ⊢ ((𝐴 ⊆ 𝑋 ∧ 𝐴 ⊆ 𝑋) → (𝐴 × 𝐴) ⊆ (𝑋 × 𝑋))
3	1, 2	sylancom 590	. . . . . 6 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (𝐴 × 𝐴) ⊆ (𝑋 × 𝑋))
4	3	resabs1d 5877	. . . . 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 6677	. . . . . . . . 9 ⊢ 𝑋 ∈ V
7	6	ssex 5216	. . . . . . . 8 ⊢ (𝐴 ⊆ 𝑋 → 𝐴 ∈ V)
8	7	adantl 484	. . . . . . 7 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → 𝐴 ∈ V)
9		cmsss.h	. . . . . . . 8 ⊢ 𝐾 = (𝑀 ↾_s 𝐴)
10		eqid 2819	. . . . . . . 8 ⊢ (dist‘𝑀) = (dist‘𝑀)
11	9, 10	ressds 16678	. . . . . . 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 16547	. . . . . . . 8 ⊢ (𝐴 ⊆ 𝑋 → 𝐴 = (Base‘𝐾))
14	13	adantl 484	. . . . . . 7 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → 𝐴 = (Base‘𝐾))
15	14	sqxpeqd 5580	. . . . . 6 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (𝐴 × 𝐴) = ((Base‘𝐾) × (Base‘𝐾)))
16	12, 15	reseq12d 5847	. . . . 5 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → ((dist‘𝑀) ↾ (𝐴 × 𝐴)) = ((dist‘𝐾) ↾ ((Base‘𝐾) × (Base‘𝐾))))
17	4, 16	eqtrd 2854	. . . 4 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (((dist‘𝑀) ↾ (𝑋 × 𝑋)) ↾ (𝐴 × 𝐴)) = ((dist‘𝐾) ↾ ((Base‘𝐾) × (Base‘𝐾))))
18	14	fveq2d 6667	. . . 4 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (CMet‘𝐴) = (CMet‘(Base‘𝐾)))
19	17, 18	eleq12d 2905	. . 3 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → ((((dist‘𝑀) ↾ (𝑋 × 𝑋)) ↾ (𝐴 × 𝐴)) ∈ (CMet‘𝐴) ↔ ((dist‘𝐾) ↾ ((Base‘𝐾) × (Base‘𝐾))) ∈ (CMet‘(Base‘𝐾))))
20		eqid 2819	. . . . . 6 ⊢ ((dist‘𝑀) ↾ (𝑋 × 𝑋)) = ((dist‘𝑀) ↾ (𝑋 × 𝑋))
21	5, 20	cmscmet 23941	. . . . 5 ⊢ (𝑀 ∈ CMetSp → ((dist‘𝑀) ↾ (𝑋 × 𝑋)) ∈ (CMet‘𝑋))
22	21	adantr 483	. . . 4 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → ((dist‘𝑀) ↾ (𝑋 × 𝑋)) ∈ (CMet‘𝑋))
23		eqid 2819	. . . . 5 ⊢ (MetOpen‘((dist‘𝑀) ↾ (𝑋 × 𝑋))) = (MetOpen‘((dist‘𝑀) ↾ (𝑋 × 𝑋)))
24	23	cmetss 23911	. . . 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 283	. 2 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (((dist‘𝐾) ↾ ((Base‘𝐾) × (Base‘𝐾))) ∈ (CMet‘(Base‘𝐾)) ↔ 𝐴 ∈ (Clsd‘(MetOpen‘((dist‘𝑀) ↾ (𝑋 × 𝑋))))))
27		cmsms 23943	. . . 4 ⊢ (𝑀 ∈ CMetSp → 𝑀 ∈ MetSp)
28		ressms 23128	. . . . 5 ⊢ ((𝑀 ∈ MetSp ∧ 𝐴 ∈ V) → (𝑀 ↾_s 𝐴) ∈ MetSp)
29	9, 28	eqeltrid 2915	. . . 4 ⊢ ((𝑀 ∈ MetSp ∧ 𝐴 ∈ V) → 𝐾 ∈ MetSp)
30	27, 7, 29	syl2an 597	. . 3 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → 𝐾 ∈ MetSp)
31		eqid 2819	. . . . 5 ⊢ (Base‘𝐾) = (Base‘𝐾)
32		eqid 2819	. . . . 5 ⊢ ((dist‘𝐾) ↾ ((Base‘𝐾) × (Base‘𝐾))) = ((dist‘𝐾) ↾ ((Base‘𝐾) × (Base‘𝐾)))
33	31, 32	iscms 23940	. . . 4 ⊢ (𝐾 ∈ CMetSp ↔ (𝐾 ∈ MetSp ∧ ((dist‘𝐾) ↾ ((Base‘𝐾) × (Base‘𝐾))) ∈ (CMet‘(Base‘𝐾))))
34	33	baib 538	. . 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 483	. . . . 5 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → 𝑀 ∈ MetSp)
37		cmsss.j	. . . . . 6 ⊢ 𝐽 = (TopOpen‘𝑀)
38	37, 5, 20	mstopn 23054	. . . . 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 6667	. . 3 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (Clsd‘𝐽) = (Clsd‘(MetOpen‘((dist‘𝑀) ↾ (𝑋 × 𝑋)))))
41	40	eleq2d 2896	. 2 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (𝐴 ∈ (Clsd‘𝐽) ↔ 𝐴 ∈ (Clsd‘(MetOpen‘((dist‘𝑀) ↾ (𝑋 × 𝑋))))))
42	26, 35, 41	3bitr4d 313	1 ⊢ ((𝑀 ∈ CMetSp ∧ 𝐴 ⊆ 𝑋) → (𝐾 ∈ CMetSp ↔ 𝐴 ∈ (Clsd‘𝐽)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 = wceq 1531 ∈ wcel 2108 Vcvv 3493 ⊆ wss 3934 × cxp 5546 ↾ cres 5550 ‘cfv 6348 (class class class)co 7148 Basecbs 16475 ↾_s cress 16476 distcds 16566 TopOpenctopn 16687 MetOpencmopn 20527 Clsdccld 21616 MetSpcms 22920 CMetccmet 23849 CMetSpccms 23927

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1905 ax-6 1964 ax-7 2009 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2154 ax-12 2170 ax-ext 2791 ax-rep 5181 ax-sep 5194 ax-nul 5201 ax-pow 5257 ax-pr 5320 ax-un 7453 ax-cnex 10585 ax-resscn 10586 ax-1cn 10587 ax-icn 10588 ax-addcl 10589 ax-addrcl 10590 ax-mulcl 10591 ax-mulrcl 10592 ax-mulcom 10593 ax-addass 10594 ax-mulass 10595 ax-distr 10596 ax-i2m1 10597 ax-1ne0 10598 ax-1rid 10599 ax-rnegex 10600 ax-rrecex 10601 ax-cnre 10602 ax-pre-lttri 10603 ax-pre-lttrn 10604 ax-pre-ltadd 10605 ax-pre-mulgt0 10606 ax-pre-sup 10607

This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1083 df-3an 1084 df-tru 1534 df-ex 1775 df-nf 1779 df-sb 2064 df-mo 2616 df-eu 2648 df-clab 2798 df-cleq 2812 df-clel 2891 df-nfc 2961 df-ne 3015 df-nel 3122 df-ral 3141 df-rex 3142 df-reu 3143 df-rmo 3144 df-rab 3145 df-v 3495 df-sbc 3771 df-csb 3882 df-dif 3937 df-un 3939 df-in 3941 df-ss 3950 df-pss 3952 df-nul 4290 df-if 4466 df-pw 4539 df-sn 4560 df-pr 4562 df-tp 4564 df-op 4566 df-uni 4831 df-int 4868 df-iun 4912 df-iin 4913 df-br 5058 df-opab 5120 df-mpt 5138 df-tr 5164 df-id 5453 df-eprel 5458 df-po 5467 df-so 5468 df-fr 5507 df-we 5509 df-xp 5554 df-rel 5555 df-cnv 5556 df-co 5557 df-dm 5558 df-rn 5559 df-res 5560 df-ima 5561 df-pred 6141 df-ord 6187 df-on 6188 df-lim 6189 df-suc 6190 df-iota 6307 df-fun 6350 df-fn 6351 df-f 6352 df-f1 6353 df-fo 6354 df-f1o 6355 df-fv 6356 df-riota 7106 df-ov 7151 df-oprab 7152 df-mpo 7153 df-om 7573 df-1st 7681 df-2nd 7682 df-wrecs 7939 df-recs 8000 df-rdg 8038 df-1o 8094 df-oadd 8098 df-er 8281 df-map 8400 df-en 8502 df-dom 8503 df-sdom 8504 df-fin 8505 df-fi 8867 df-sup 8898 df-inf 8899 df-pnf 10669 df-mnf 10670 df-xr 10671 df-ltxr 10672 df-le 10673 df-sub 10864 df-neg 10865 df-div 11290 df-nn 11631 df-2 11692 df-3 11693 df-4 11694 df-5 11695 df-6 11696 df-7 11697 df-8 11698 df-9 11699 df-n0 11890 df-z 11974 df-dec 12091 df-uz 12236 df-q 12341 df-rp 12382 df-xneg 12499 df-xadd 12500 df-xmul 12501 df-ico 12736 df-icc 12737 df-ndx 16478 df-slot 16479 df-base 16481 df-sets 16482 df-ress 16483 df-tset 16576 df-ds 16579 df-rest 16688 df-topn 16689 df-topgen 16709 df-psmet 20529 df-xmet 20530 df-met 20531 df-bl 20532 df-mopn 20533 df-fbas 20534 df-fg 20535 df-top 21494 df-topon 21511 df-topsp 21533 df-bases 21546 df-cld 21619 df-ntr 21620 df-cls 21621 df-nei 21698 df-haus 21915 df-fil 22446 df-flim 22539 df-xms 22922 df-ms 22923 df-cfil 23850 df-cmet 23852 df-cms 23930

This theorem is referenced by: lssbn 23947 resscdrg 23953 srabn 23955 ishl2 23965 recms 23975 pjthlem2 24033

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