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Theorem cncmet 24830

Description: The set of complex numbers is a complete metric space under the absolute value metric. (Contributed by NM, 20-Dec-2006.) (Revised by Mario Carneiro, 15-Oct-2015.)

**Hypothesis**
Ref	Expression
cncmet.1	⊢ 𝐷 = (abs ∘ − )

**Assertion**
Ref	Expression
cncmet	⊢ 𝐷 ∈ (CMet‘ℂ)

Proof of Theorem cncmet Dummy variables 𝑥 𝑟 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqid 2732	. . . . 5 ⊢ (TopOpen‘ℂ_fld) = (TopOpen‘ℂ_fld)
2	1	cnfldtopn 24289	. . . 4 ⊢ (TopOpen‘ℂ_fld) = (MetOpen‘(abs ∘ − ))
3		cncmet.1	. . . . 5 ⊢ 𝐷 = (abs ∘ − )
4	3	fveq2i 6891	. . . 4 ⊢ (MetOpen‘𝐷) = (MetOpen‘(abs ∘ − ))
5	2, 4	eqtr4i 2763	. . 3 ⊢ (TopOpen‘ℂ_fld) = (MetOpen‘𝐷)
6		cnmet 24279	. . . . 5 ⊢ (abs ∘ − ) ∈ (Met‘ℂ)
7	3, 6	eqeltri 2829	. . . 4 ⊢ 𝐷 ∈ (Met‘ℂ)
8	7	a1i 11	. . 3 ⊢ (⊤ → 𝐷 ∈ (Met‘ℂ))
9		1rp 12974	. . . 4 ⊢ 1 ∈ ℝ⁺
10	9	a1i 11	. . 3 ⊢ (⊤ → 1 ∈ ℝ⁺)
11	1	cnfldtop 24291	. . . . . 6 ⊢ (TopOpen‘ℂ_fld) ∈ Top
12		metxmet 23831	. . . . . . . 8 ⊢ (𝐷 ∈ (Met‘ℂ) → 𝐷 ∈ (∞Met‘ℂ))
13	7, 12	ax-mp 5	. . . . . . 7 ⊢ 𝐷 ∈ (∞Met‘ℂ)
14		1xr 11269	. . . . . . 7 ⊢ 1 ∈ ℝ^*
15		blssm 23915	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘ℂ) ∧ 𝑥 ∈ ℂ ∧ 1 ∈ ℝ^*) → (𝑥(ball‘𝐷)1) ⊆ ℂ)
16	13, 14, 15	mp3an13 1452	. . . . . 6 ⊢ (𝑥 ∈ ℂ → (𝑥(ball‘𝐷)1) ⊆ ℂ)
17		unicntop 24293	. . . . . . 7 ⊢ ℂ = ∪ (TopOpen‘ℂ_fld)
18	17	clscld 22542	. . . . . 6 ⊢ (((TopOpen‘ℂ_fld) ∈ Top ∧ (𝑥(ball‘𝐷)1) ⊆ ℂ) → ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1)) ∈ (Clsd‘(TopOpen‘ℂ_fld)))
19	11, 16, 18	sylancr 587	. . . . 5 ⊢ (𝑥 ∈ ℂ → ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1)) ∈ (Clsd‘(TopOpen‘ℂ_fld)))
20		abscl 15221	. . . . . . 7 ⊢ (𝑥 ∈ ℂ → (abs‘𝑥) ∈ ℝ)
21		peano2re 11383	. . . . . . 7 ⊢ ((abs‘𝑥) ∈ ℝ → ((abs‘𝑥) + 1) ∈ ℝ)
22	20, 21	syl 17	. . . . . 6 ⊢ (𝑥 ∈ ℂ → ((abs‘𝑥) + 1) ∈ ℝ)
23		df-rab 3433	. . . . . . . . . . 11 ⊢ {𝑦 ∈ ℂ ∣ (𝑥𝐷𝑦) ≤ 1} = {𝑦 ∣ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)}
24	23	eqcomi 2741	. . . . . . . . . 10 ⊢ {𝑦 ∣ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)} = {𝑦 ∈ ℂ ∣ (𝑥𝐷𝑦) ≤ 1}
25	5, 24	blcls 24006	. . . . . . . . 9 ⊢ ((𝐷 ∈ (∞Met‘ℂ) ∧ 𝑥 ∈ ℂ ∧ 1 ∈ ℝ^*) → ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1)) ⊆ {𝑦 ∣ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)})
26	13, 14, 25	mp3an13 1452	. . . . . . . 8 ⊢ (𝑥 ∈ ℂ → ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1)) ⊆ {𝑦 ∣ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)})
27		abscl 15221	. . . . . . . . . . . . . 14 ⊢ (𝑦 ∈ ℂ → (abs‘𝑦) ∈ ℝ)
28	27	ad2antrl 726	. . . . . . . . . . . . 13 ⊢ ((𝑥 ∈ ℂ ∧ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)) → (abs‘𝑦) ∈ ℝ)
29	20	adantr 481	. . . . . . . . . . . . 13 ⊢ ((𝑥 ∈ ℂ ∧ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)) → (abs‘𝑥) ∈ ℝ)
30	28, 29	resubcld 11638	. . . . . . . . . . . 12 ⊢ ((𝑥 ∈ ℂ ∧ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)) → ((abs‘𝑦) − (abs‘𝑥)) ∈ ℝ)
31		simpl 483	. . . . . . . . . . . . . 14 ⊢ ((𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1) → 𝑦 ∈ ℂ)
32		id 22	. . . . . . . . . . . . . 14 ⊢ (𝑥 ∈ ℂ → 𝑥 ∈ ℂ)
33		subcl 11455	. . . . . . . . . . . . . 14 ⊢ ((𝑦 ∈ ℂ ∧ 𝑥 ∈ ℂ) → (𝑦 − 𝑥) ∈ ℂ)
34	31, 32, 33	syl2anr 597	. . . . . . . . . . . . 13 ⊢ ((𝑥 ∈ ℂ ∧ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)) → (𝑦 − 𝑥) ∈ ℂ)
35	34	abscld 15379	. . . . . . . . . . . 12 ⊢ ((𝑥 ∈ ℂ ∧ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)) → (abs‘(𝑦 − 𝑥)) ∈ ℝ)
36		1red 11211	. . . . . . . . . . . 12 ⊢ ((𝑥 ∈ ℂ ∧ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)) → 1 ∈ ℝ)
37		simprl 769	. . . . . . . . . . . . 13 ⊢ ((𝑥 ∈ ℂ ∧ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)) → 𝑦 ∈ ℂ)
38		simpl 483	. . . . . . . . . . . . 13 ⊢ ((𝑥 ∈ ℂ ∧ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)) → 𝑥 ∈ ℂ)
39	37, 38	abs2difd 15400	. . . . . . . . . . . 12 ⊢ ((𝑥 ∈ ℂ ∧ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)) → ((abs‘𝑦) − (abs‘𝑥)) ≤ (abs‘(𝑦 − 𝑥)))
40	3	cnmetdval 24278	. . . . . . . . . . . . . . 15 ⊢ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) → (𝑥𝐷𝑦) = (abs‘(𝑥 − 𝑦)))
41		abssub 15269	. . . . . . . . . . . . . . 15 ⊢ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) → (abs‘(𝑥 − 𝑦)) = (abs‘(𝑦 − 𝑥)))
42	40, 41	eqtrd 2772	. . . . . . . . . . . . . 14 ⊢ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) → (𝑥𝐷𝑦) = (abs‘(𝑦 − 𝑥)))
43	42	adantrr 715	. . . . . . . . . . . . 13 ⊢ ((𝑥 ∈ ℂ ∧ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)) → (𝑥𝐷𝑦) = (abs‘(𝑦 − 𝑥)))
44		simprr 771	. . . . . . . . . . . . 13 ⊢ ((𝑥 ∈ ℂ ∧ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)) → (𝑥𝐷𝑦) ≤ 1)
45	43, 44	eqbrtrrd 5171	. . . . . . . . . . . 12 ⊢ ((𝑥 ∈ ℂ ∧ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)) → (abs‘(𝑦 − 𝑥)) ≤ 1)
46	30, 35, 36, 39, 45	letrd 11367	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℂ ∧ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)) → ((abs‘𝑦) − (abs‘𝑥)) ≤ 1)
47	28, 29, 36	lesubadd2d 11809	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℂ ∧ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)) → (((abs‘𝑦) − (abs‘𝑥)) ≤ 1 ↔ (abs‘𝑦) ≤ ((abs‘𝑥) + 1)))
48	46, 47	mpbid 231	. . . . . . . . . 10 ⊢ ((𝑥 ∈ ℂ ∧ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)) → (abs‘𝑦) ≤ ((abs‘𝑥) + 1))
49	48	ex 413	. . . . . . . . 9 ⊢ (𝑥 ∈ ℂ → ((𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1) → (abs‘𝑦) ≤ ((abs‘𝑥) + 1)))
50	49	ss2abdv 4059	. . . . . . . 8 ⊢ (𝑥 ∈ ℂ → {𝑦 ∣ (𝑦 ∈ ℂ ∧ (𝑥𝐷𝑦) ≤ 1)} ⊆ {𝑦 ∣ (abs‘𝑦) ≤ ((abs‘𝑥) + 1)})
51	26, 50	sstrd 3991	. . . . . . 7 ⊢ (𝑥 ∈ ℂ → ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1)) ⊆ {𝑦 ∣ (abs‘𝑦) ≤ ((abs‘𝑥) + 1)})
52		ssabral 4058	. . . . . . 7 ⊢ (((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1)) ⊆ {𝑦 ∣ (abs‘𝑦) ≤ ((abs‘𝑥) + 1)} ↔ ∀𝑦 ∈ ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1))(abs‘𝑦) ≤ ((abs‘𝑥) + 1))
53	51, 52	sylib 217	. . . . . 6 ⊢ (𝑥 ∈ ℂ → ∀𝑦 ∈ ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1))(abs‘𝑦) ≤ ((abs‘𝑥) + 1))
54		brralrspcev 5207	. . . . . 6 ⊢ ((((abs‘𝑥) + 1) ∈ ℝ ∧ ∀𝑦 ∈ ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1))(abs‘𝑦) ≤ ((abs‘𝑥) + 1)) → ∃𝑟 ∈ ℝ ∀𝑦 ∈ ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1))(abs‘𝑦) ≤ 𝑟)
55	22, 53, 54	syl2anc 584	. . . . 5 ⊢ (𝑥 ∈ ℂ → ∃𝑟 ∈ ℝ ∀𝑦 ∈ ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1))(abs‘𝑦) ≤ 𝑟)
56	17	clsss3 22554	. . . . . . 7 ⊢ (((TopOpen‘ℂ_fld) ∈ Top ∧ (𝑥(ball‘𝐷)1) ⊆ ℂ) → ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1)) ⊆ ℂ)
57	11, 16, 56	sylancr 587	. . . . . 6 ⊢ (𝑥 ∈ ℂ → ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1)) ⊆ ℂ)
58		eqid 2732	. . . . . . 7 ⊢ ((TopOpen‘ℂ_fld) ↾_t ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1))) = ((TopOpen‘ℂ_fld) ↾_t ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1)))
59	1, 58	cnheibor 24462	. . . . . 6 ⊢ (((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1)) ⊆ ℂ → (((TopOpen‘ℂ_fld) ↾_t ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1))) ∈ Comp ↔ (((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1)) ∈ (Clsd‘(TopOpen‘ℂ_fld)) ∧ ∃𝑟 ∈ ℝ ∀𝑦 ∈ ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1))(abs‘𝑦) ≤ 𝑟)))
60	57, 59	syl 17	. . . . 5 ⊢ (𝑥 ∈ ℂ → (((TopOpen‘ℂ_fld) ↾_t ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1))) ∈ Comp ↔ (((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1)) ∈ (Clsd‘(TopOpen‘ℂ_fld)) ∧ ∃𝑟 ∈ ℝ ∀𝑦 ∈ ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1))(abs‘𝑦) ≤ 𝑟)))
61	19, 55, 60	mpbir2and 711	. . . 4 ⊢ (𝑥 ∈ ℂ → ((TopOpen‘ℂ_fld) ↾_t ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1))) ∈ Comp)
62	61	adantl 482	. . 3 ⊢ ((⊤ ∧ 𝑥 ∈ ℂ) → ((TopOpen‘ℂ_fld) ↾_t ((cls‘(TopOpen‘ℂ_fld))‘(𝑥(ball‘𝐷)1))) ∈ Comp)
63	5, 8, 10, 62	relcmpcmet 24826	. 2 ⊢ (⊤ → 𝐷 ∈ (CMet‘ℂ))
64	63	mptru 1548	1 ⊢ 𝐷 ∈ (CMet‘ℂ)

Colors of variables: wff setvar class

Syntax hints: ↔ wb 205 ∧ wa 396 = wceq 1541 ⊤wtru 1542 ∈ wcel 2106 {cab 2709 ∀wral 3061 ∃wrex 3070 {crab 3432 ⊆ wss 3947 class class class wbr 5147 ∘ ccom 5679 ‘cfv 6540 (class class class)co 7405 ℂcc 11104 ℝcr 11105 1c1 11107 + caddc 11109 ℝ^*cxr 11243 ≤ cle 11245 − cmin 11440 ℝ⁺crp 12970 abscabs 15177 ↾_t crest 17362 TopOpenctopn 17363 ∞Metcxmet 20921 Metcmet 20922 ballcbl 20923 MetOpencmopn 20926 ℂ_fldccnfld 20936 Topctop 22386 Clsdccld 22511 clsccl 22513 Compccmp 22881 CMetccmet 24762

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 2703 ax-rep 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183 ax-pre-sup 11184 ax-addf 11185 ax-mulf 11186

This theorem depends on definitions: df-bi 206 df-an 397 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 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-tp 4632 df-op 4634 df-uni 4908 df-int 4950 df-iun 4998 df-iin 4999 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-se 5631 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-isom 6549 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-of 7666 df-om 7852 df-1st 7971 df-2nd 7972 df-supp 8143 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-1o 8462 df-2o 8463 df-er 8699 df-map 8818 df-ixp 8888 df-en 8936 df-dom 8937 df-sdom 8938 df-fin 8939 df-fsupp 9358 df-fi 9402 df-sup 9433 df-inf 9434 df-oi 9501 df-card 9930 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-div 11868 df-nn 12209 df-2 12271 df-3 12272 df-4 12273 df-5 12274 df-6 12275 df-7 12276 df-8 12277 df-9 12278 df-n0 12469 df-z 12555 df-dec 12674 df-uz 12819 df-q 12929 df-rp 12971 df-xneg 13088 df-xadd 13089 df-xmul 13090 df-ioo 13324 df-ico 13326 df-icc 13327 df-fz 13481 df-fzo 13624 df-seq 13963 df-exp 14024 df-hash 14287 df-cj 15042 df-re 15043 df-im 15044 df-sqrt 15178 df-abs 15179 df-struct 17076 df-sets 17093 df-slot 17111 df-ndx 17123 df-base 17141 df-ress 17170 df-plusg 17206 df-mulr 17207 df-starv 17208 df-sca 17209 df-vsca 17210 df-ip 17211 df-tset 17212 df-ple 17213 df-ds 17215 df-unif 17216 df-hom 17217 df-cco 17218 df-rest 17364 df-topn 17365 df-0g 17383 df-gsum 17384 df-topgen 17385 df-pt 17386 df-prds 17389 df-xrs 17444 df-qtop 17449 df-imas 17450 df-xps 17452 df-mre 17526 df-mrc 17527 df-acs 17529 df-mgm 18557 df-sgrp 18606 df-mnd 18622 df-submnd 18668 df-mulg 18945 df-cntz 19175 df-cmn 19644 df-psmet 20928 df-xmet 20929 df-met 20930 df-bl 20931 df-mopn 20932 df-fbas 20933 df-fg 20934 df-cnfld 20937 df-top 22387 df-topon 22404 df-topsp 22426 df-bases 22440 df-cld 22514 df-ntr 22515 df-cls 22516 df-nei 22593 df-cn 22722 df-cnp 22723 df-haus 22810 df-cmp 22882 df-tx 23057 df-hmeo 23250 df-fil 23341 df-flim 23434 df-fcls 23436 df-xms 23817 df-ms 23818 df-tms 23819 df-cncf 24385 df-cfil 24763 df-cmet 24765

This theorem is referenced by: recmet 24831 cncms 24863 cnbn 30109

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