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Theorem zdis 22619

Description: The integers are a discrete set in the topology on ℂ. (Contributed by Mario Carneiro, 19-Sep-2015.)

**Hypothesis**
Ref	Expression
recld2.1	⊢ 𝐽 = (TopOpen‘ℂ_fld)

**Assertion**
Ref	Expression
zdis	⊢ (𝐽 ↾_t ℤ) = 𝒫 ℤ

Proof of Theorem zdis Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		restsspw 16092	. 2 ⊢ (𝐽 ↾_t ℤ) ⊆ 𝒫 ℤ
2		elpwi 4168	. . . . . . . . 9 ⊢ (𝑥 ∈ 𝒫 ℤ → 𝑥 ⊆ ℤ)
3	2	sselda 3603	. . . . . . . 8 ⊢ ((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) → 𝑦 ∈ ℤ)
4	3	zcnd 11483	. . . . . . 7 ⊢ ((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) → 𝑦 ∈ ℂ)
5		cnxmet 22576	. . . . . . . 8 ⊢ (abs ∘ − ) ∈ (∞Met‘ℂ)
6		1rp 11836	. . . . . . . . 9 ⊢ 1 ∈ ℝ⁺
7		rpxr 11840	. . . . . . . . 9 ⊢ (1 ∈ ℝ⁺ → 1 ∈ ℝ^*)
8	6, 7	ax-mp 5	. . . . . . . 8 ⊢ 1 ∈ ℝ^*
9		recld2.1	. . . . . . . . . 10 ⊢ 𝐽 = (TopOpen‘ℂ_fld)
10	9	cnfldtopn 22585	. . . . . . . . 9 ⊢ 𝐽 = (MetOpen‘(abs ∘ − ))
11	10	blopn 22305	. . . . . . . 8 ⊢ (((abs ∘ − ) ∈ (∞Met‘ℂ) ∧ 𝑦 ∈ ℂ ∧ 1 ∈ ℝ^*) → (𝑦(ball‘(abs ∘ − ))1) ∈ 𝐽)
12	5, 8, 11	mp3an13 1415	. . . . . . 7 ⊢ (𝑦 ∈ ℂ → (𝑦(ball‘(abs ∘ − ))1) ∈ 𝐽)
13	9	cnfldtop 22587	. . . . . . . 8 ⊢ 𝐽 ∈ Top
14		zex 11386	. . . . . . . 8 ⊢ ℤ ∈ V
15		elrestr 16089	. . . . . . . 8 ⊢ ((𝐽 ∈ Top ∧ ℤ ∈ V ∧ (𝑦(ball‘(abs ∘ − ))1) ∈ 𝐽) → ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ∈ (𝐽 ↾_t ℤ))
16	13, 14, 15	mp3an12 1414	. . . . . . 7 ⊢ ((𝑦(ball‘(abs ∘ − ))1) ∈ 𝐽 → ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ∈ (𝐽 ↾_t ℤ))
17	4, 12, 16	3syl 18	. . . . . 6 ⊢ ((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) → ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ∈ (𝐽 ↾_t ℤ))
18		blcntr 22218	. . . . . . . . 9 ⊢ (((abs ∘ − ) ∈ (∞Met‘ℂ) ∧ 𝑦 ∈ ℂ ∧ 1 ∈ ℝ⁺) → 𝑦 ∈ (𝑦(ball‘(abs ∘ − ))1))
19	5, 6, 18	mp3an13 1415	. . . . . . . 8 ⊢ (𝑦 ∈ ℂ → 𝑦 ∈ (𝑦(ball‘(abs ∘ − ))1))
20	4, 19	syl 17	. . . . . . 7 ⊢ ((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) → 𝑦 ∈ (𝑦(ball‘(abs ∘ − ))1))
21	20, 3	elind 3798	. . . . . 6 ⊢ ((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) → 𝑦 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ))
22	4	adantr 481	. . . . . . . . . 10 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → 𝑦 ∈ ℂ)
23		inss2 3834	. . . . . . . . . . . 12 ⊢ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ⊆ ℤ
24		simpr 477	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ))
25	23, 24	sseldi 3601	. . . . . . . . . . 11 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → 𝑧 ∈ ℤ)
26	25	zcnd 11483	. . . . . . . . . 10 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → 𝑧 ∈ ℂ)
27	3	adantr 481	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → 𝑦 ∈ ℤ)
28	27, 25	zsubcld 11487	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → (𝑦 − 𝑧) ∈ ℤ)
29	28	zcnd 11483	. . . . . . . . . . 11 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → (𝑦 − 𝑧) ∈ ℂ)
30		eqid 2622	. . . . . . . . . . . . . . 15 ⊢ (abs ∘ − ) = (abs ∘ − )
31	30	cnmetdval 22574	. . . . . . . . . . . . . 14 ⊢ ((𝑦 ∈ ℂ ∧ 𝑧 ∈ ℂ) → (𝑦(abs ∘ − )𝑧) = (abs‘(𝑦 − 𝑧)))
32	22, 26, 31	syl2anc 693	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → (𝑦(abs ∘ − )𝑧) = (abs‘(𝑦 − 𝑧)))
33		inss1 3833	. . . . . . . . . . . . . . 15 ⊢ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ⊆ (𝑦(ball‘(abs ∘ − ))1)
34	33, 24	sseldi 3601	. . . . . . . . . . . . . 14 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → 𝑧 ∈ (𝑦(ball‘(abs ∘ − ))1))
35		elbl2 22195	. . . . . . . . . . . . . . . 16 ⊢ ((((abs ∘ − ) ∈ (∞Met‘ℂ) ∧ 1 ∈ ℝ^*) ∧ (𝑦 ∈ ℂ ∧ 𝑧 ∈ ℂ)) → (𝑧 ∈ (𝑦(ball‘(abs ∘ − ))1) ↔ (𝑦(abs ∘ − )𝑧) < 1))
36	5, 8, 35	mpanl12 718	. . . . . . . . . . . . . . 15 ⊢ ((𝑦 ∈ ℂ ∧ 𝑧 ∈ ℂ) → (𝑧 ∈ (𝑦(ball‘(abs ∘ − ))1) ↔ (𝑦(abs ∘ − )𝑧) < 1))
37	22, 26, 36	syl2anc 693	. . . . . . . . . . . . . 14 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → (𝑧 ∈ (𝑦(ball‘(abs ∘ − ))1) ↔ (𝑦(abs ∘ − )𝑧) < 1))
38	34, 37	mpbid 222	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → (𝑦(abs ∘ − )𝑧) < 1)
39	32, 38	eqbrtrrd 4677	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → (abs‘(𝑦 − 𝑧)) < 1)
40		nn0abscl 14052	. . . . . . . . . . . . 13 ⊢ ((𝑦 − 𝑧) ∈ ℤ → (abs‘(𝑦 − 𝑧)) ∈ ℕ₀)
41		nn0lt10b 11439	. . . . . . . . . . . . 13 ⊢ ((abs‘(𝑦 − 𝑧)) ∈ ℕ₀ → ((abs‘(𝑦 − 𝑧)) < 1 ↔ (abs‘(𝑦 − 𝑧)) = 0))
42	28, 40, 41	3syl 18	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → ((abs‘(𝑦 − 𝑧)) < 1 ↔ (abs‘(𝑦 − 𝑧)) = 0))
43	39, 42	mpbid 222	. . . . . . . . . . 11 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → (abs‘(𝑦 − 𝑧)) = 0)
44	29, 43	abs00d 14185	. . . . . . . . . 10 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → (𝑦 − 𝑧) = 0)
45	22, 26, 44	subeq0d 10400	. . . . . . . . 9 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → 𝑦 = 𝑧)
46		simplr 792	. . . . . . . . 9 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → 𝑦 ∈ 𝑥)
47	45, 46	eqeltrrd 2702	. . . . . . . 8 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → 𝑧 ∈ 𝑥)
48	47	ex 450	. . . . . . 7 ⊢ ((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) → (𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) → 𝑧 ∈ 𝑥))
49	48	ssrdv 3609	. . . . . 6 ⊢ ((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) → ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ⊆ 𝑥)
50		eleq2 2690	. . . . . . . 8 ⊢ (𝑧 = ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) → (𝑦 ∈ 𝑧 ↔ 𝑦 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)))
51		sseq1 3626	. . . . . . . 8 ⊢ (𝑧 = ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) → (𝑧 ⊆ 𝑥 ↔ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ⊆ 𝑥))
52	50, 51	anbi12d 747	. . . . . . 7 ⊢ (𝑧 = ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) → ((𝑦 ∈ 𝑧 ∧ 𝑧 ⊆ 𝑥) ↔ (𝑦 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ∧ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ⊆ 𝑥)))
53	52	rspcev 3309	. . . . . 6 ⊢ ((((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ∈ (𝐽 ↾_t ℤ) ∧ (𝑦 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ∧ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ⊆ 𝑥)) → ∃𝑧 ∈ (𝐽 ↾_t ℤ)(𝑦 ∈ 𝑧 ∧ 𝑧 ⊆ 𝑥))
54	17, 21, 49, 53	syl12anc 1324	. . . . 5 ⊢ ((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) → ∃𝑧 ∈ (𝐽 ↾_t ℤ)(𝑦 ∈ 𝑧 ∧ 𝑧 ⊆ 𝑥))
55	54	ralrimiva 2966	. . . 4 ⊢ (𝑥 ∈ 𝒫 ℤ → ∀𝑦 ∈ 𝑥 ∃𝑧 ∈ (𝐽 ↾_t ℤ)(𝑦 ∈ 𝑧 ∧ 𝑧 ⊆ 𝑥))
56		resttop 20964	. . . . . 6 ⊢ ((𝐽 ∈ Top ∧ ℤ ∈ V) → (𝐽 ↾_t ℤ) ∈ Top)
57	13, 14, 56	mp2an 708	. . . . 5 ⊢ (𝐽 ↾_t ℤ) ∈ Top
58		eltop2 20779	. . . . 5 ⊢ ((𝐽 ↾_t ℤ) ∈ Top → (𝑥 ∈ (𝐽 ↾_t ℤ) ↔ ∀𝑦 ∈ 𝑥 ∃𝑧 ∈ (𝐽 ↾_t ℤ)(𝑦 ∈ 𝑧 ∧ 𝑧 ⊆ 𝑥)))
59	57, 58	ax-mp 5	. . . 4 ⊢ (𝑥 ∈ (𝐽 ↾_t ℤ) ↔ ∀𝑦 ∈ 𝑥 ∃𝑧 ∈ (𝐽 ↾_t ℤ)(𝑦 ∈ 𝑧 ∧ 𝑧 ⊆ 𝑥))
60	55, 59	sylibr 224	. . 3 ⊢ (𝑥 ∈ 𝒫 ℤ → 𝑥 ∈ (𝐽 ↾_t ℤ))
61	60	ssriv 3607	. 2 ⊢ 𝒫 ℤ ⊆ (𝐽 ↾_t ℤ)
62	1, 61	eqssi 3619	1 ⊢ (𝐽 ↾_t ℤ) = 𝒫 ℤ

Colors of variables: wff setvar class

Syntax hints: ↔ wb 196 ∧ wa 384 = wceq 1483 ∈ wcel 1990 ∀wral 2912 ∃wrex 2913 Vcvv 3200 ∩ cin 3573 ⊆ wss 3574 𝒫 cpw 4158 class class class wbr 4653 ∘ ccom 5118 ‘cfv 5888 (class class class)co 6650 ℂcc 9934 0cc0 9936 1c1 9937 ℝ^*cxr 10073 < clt 10074 − cmin 10266 ℕ₀cn0 11292 ℤcz 11377 ℝ⁺crp 11832 abscabs 13974 ↾_t crest 16081 TopOpenctopn 16082 ∞Metcxmt 19731 ballcbl 19733 ℂ_fldccnfld 19746 Topctop 20698

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-rep 4771 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 ax-cnex 9992 ax-resscn 9993 ax-1cn 9994 ax-icn 9995 ax-addcl 9996 ax-addrcl 9997 ax-mulcl 9998 ax-mulrcl 9999 ax-mulcom 10000 ax-addass 10001 ax-mulass 10002 ax-distr 10003 ax-i2m1 10004 ax-1ne0 10005 ax-1rid 10006 ax-rnegex 10007 ax-rrecex 10008 ax-cnre 10009 ax-pre-lttri 10010 ax-pre-lttrn 10011 ax-pre-ltadd 10012 ax-pre-mulgt0 10013 ax-pre-sup 10014

This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3or 1038 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-nel 2898 df-ral 2917 df-rex 2918 df-reu 2919 df-rmo 2920 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-pss 3590 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-tp 4182 df-op 4184 df-uni 4437 df-int 4476 df-iun 4522 df-br 4654 df-opab 4713 df-mpt 4730 df-tr 4753 df-id 5024 df-eprel 5029 df-po 5035 df-so 5036 df-fr 5073 df-we 5075 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-pred 5680 df-ord 5726 df-on 5727 df-lim 5728 df-suc 5729 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-fv 5896 df-riota 6611 df-ov 6653 df-oprab 6654 df-mpt2 6655 df-om 7066 df-1st 7168 df-2nd 7169 df-wrecs 7407 df-recs 7468 df-rdg 7506 df-1o 7560 df-oadd 7564 df-er 7742 df-map 7859 df-en 7956 df-dom 7957 df-sdom 7958 df-fin 7959 df-fi 8317 df-sup 8348 df-inf 8349 df-pnf 10076 df-mnf 10077 df-xr 10078 df-ltxr 10079 df-le 10080 df-sub 10268 df-neg 10269 df-div 10685 df-nn 11021 df-2 11079 df-3 11080 df-4 11081 df-5 11082 df-6 11083 df-7 11084 df-8 11085 df-9 11086 df-n0 11293 df-z 11378 df-dec 11494 df-uz 11688 df-q 11789 df-rp 11833 df-xneg 11946 df-xadd 11947 df-xmul 11948 df-fz 12327 df-seq 12802 df-exp 12861 df-cj 13839 df-re 13840 df-im 13841 df-sqrt 13975 df-abs 13976 df-struct 15859 df-ndx 15860 df-slot 15861 df-base 15863 df-plusg 15954 df-mulr 15955 df-starv 15956 df-tset 15960 df-ple 15961 df-ds 15964 df-unif 15965 df-rest 16083 df-topn 16084 df-topgen 16104 df-psmet 19738 df-xmet 19739 df-met 19740 df-bl 19741 df-mopn 19742 df-cnfld 19747 df-top 20699 df-topon 20716 df-topsp 20737 df-bases 20750 df-xms 22125 df-ms 22126

This theorem is referenced by: sszcld 22620

W3C validator