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Theorem zdis 23418

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 16699	. 2 ⊢ (𝐽 ↾_t ℤ) ⊆ 𝒫 ℤ
2		elpwi 4551	. . . . . . . . 9 ⊢ (𝑥 ∈ 𝒫 ℤ → 𝑥 ⊆ ℤ)
3	2	sselda 3967	. . . . . . . 8 ⊢ ((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) → 𝑦 ∈ ℤ)
4	3	zcnd 12082	. . . . . . 7 ⊢ ((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) → 𝑦 ∈ ℂ)
5		cnxmet 23375	. . . . . . . 8 ⊢ (abs ∘ − ) ∈ (∞Met‘ℂ)
6		1xr 10694	. . . . . . . 8 ⊢ 1 ∈ ℝ^*
7		recld2.1	. . . . . . . . . 10 ⊢ 𝐽 = (TopOpen‘ℂ_fld)
8	7	cnfldtopn 23384	. . . . . . . . 9 ⊢ 𝐽 = (MetOpen‘(abs ∘ − ))
9	8	blopn 23104	. . . . . . . 8 ⊢ (((abs ∘ − ) ∈ (∞Met‘ℂ) ∧ 𝑦 ∈ ℂ ∧ 1 ∈ ℝ^*) → (𝑦(ball‘(abs ∘ − ))1) ∈ 𝐽)
10	5, 6, 9	mp3an13 1448	. . . . . . 7 ⊢ (𝑦 ∈ ℂ → (𝑦(ball‘(abs ∘ − ))1) ∈ 𝐽)
11	7	cnfldtop 23386	. . . . . . . 8 ⊢ 𝐽 ∈ Top
12		zex 11984	. . . . . . . 8 ⊢ ℤ ∈ V
13		elrestr 16696	. . . . . . . 8 ⊢ ((𝐽 ∈ Top ∧ ℤ ∈ V ∧ (𝑦(ball‘(abs ∘ − ))1) ∈ 𝐽) → ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ∈ (𝐽 ↾_t ℤ))
14	11, 12, 13	mp3an12 1447	. . . . . . 7 ⊢ ((𝑦(ball‘(abs ∘ − ))1) ∈ 𝐽 → ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ∈ (𝐽 ↾_t ℤ))
15	4, 10, 14	3syl 18	. . . . . 6 ⊢ ((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) → ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ∈ (𝐽 ↾_t ℤ))
16		1rp 12387	. . . . . . . . 9 ⊢ 1 ∈ ℝ⁺
17		blcntr 23017	. . . . . . . . 9 ⊢ (((abs ∘ − ) ∈ (∞Met‘ℂ) ∧ 𝑦 ∈ ℂ ∧ 1 ∈ ℝ⁺) → 𝑦 ∈ (𝑦(ball‘(abs ∘ − ))1))
18	5, 16, 17	mp3an13 1448	. . . . . . . 8 ⊢ (𝑦 ∈ ℂ → 𝑦 ∈ (𝑦(ball‘(abs ∘ − ))1))
19	4, 18	syl 17	. . . . . . 7 ⊢ ((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) → 𝑦 ∈ (𝑦(ball‘(abs ∘ − ))1))
20	19, 3	elind 4171	. . . . . 6 ⊢ ((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) → 𝑦 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ))
21	4	adantr 483	. . . . . . . . . 10 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → 𝑦 ∈ ℂ)
22		simpr 487	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ))
23	22	elin2d 4176	. . . . . . . . . . 11 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → 𝑧 ∈ ℤ)
24	23	zcnd 12082	. . . . . . . . . 10 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → 𝑧 ∈ ℂ)
25	3	adantr 483	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → 𝑦 ∈ ℤ)
26	25, 23	zsubcld 12086	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → (𝑦 − 𝑧) ∈ ℤ)
27	26	zcnd 12082	. . . . . . . . . . 11 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → (𝑦 − 𝑧) ∈ ℂ)
28		eqid 2821	. . . . . . . . . . . . . . 15 ⊢ (abs ∘ − ) = (abs ∘ − )
29	28	cnmetdval 23373	. . . . . . . . . . . . . 14 ⊢ ((𝑦 ∈ ℂ ∧ 𝑧 ∈ ℂ) → (𝑦(abs ∘ − )𝑧) = (abs‘(𝑦 − 𝑧)))
30	21, 24, 29	syl2anc 586	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → (𝑦(abs ∘ − )𝑧) = (abs‘(𝑦 − 𝑧)))
31	22	elin1d 4175	. . . . . . . . . . . . . 14 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → 𝑧 ∈ (𝑦(ball‘(abs ∘ − ))1))
32		elbl2 22994	. . . . . . . . . . . . . . . 16 ⊢ ((((abs ∘ − ) ∈ (∞Met‘ℂ) ∧ 1 ∈ ℝ^*) ∧ (𝑦 ∈ ℂ ∧ 𝑧 ∈ ℂ)) → (𝑧 ∈ (𝑦(ball‘(abs ∘ − ))1) ↔ (𝑦(abs ∘ − )𝑧) < 1))
33	5, 6, 32	mpanl12 700	. . . . . . . . . . . . . . 15 ⊢ ((𝑦 ∈ ℂ ∧ 𝑧 ∈ ℂ) → (𝑧 ∈ (𝑦(ball‘(abs ∘ − ))1) ↔ (𝑦(abs ∘ − )𝑧) < 1))
34	21, 24, 33	syl2anc 586	. . . . . . . . . . . . . 14 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → (𝑧 ∈ (𝑦(ball‘(abs ∘ − ))1) ↔ (𝑦(abs ∘ − )𝑧) < 1))
35	31, 34	mpbid 234	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → (𝑦(abs ∘ − )𝑧) < 1)
36	30, 35	eqbrtrrd 5083	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → (abs‘(𝑦 − 𝑧)) < 1)
37		nn0abscl 14666	. . . . . . . . . . . . 13 ⊢ ((𝑦 − 𝑧) ∈ ℤ → (abs‘(𝑦 − 𝑧)) ∈ ℕ₀)
38		nn0lt10b 12038	. . . . . . . . . . . . 13 ⊢ ((abs‘(𝑦 − 𝑧)) ∈ ℕ₀ → ((abs‘(𝑦 − 𝑧)) < 1 ↔ (abs‘(𝑦 − 𝑧)) = 0))
39	26, 37, 38	3syl 18	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → ((abs‘(𝑦 − 𝑧)) < 1 ↔ (abs‘(𝑦 − 𝑧)) = 0))
40	36, 39	mpbid 234	. . . . . . . . . . 11 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → (abs‘(𝑦 − 𝑧)) = 0)
41	27, 40	abs00d 14800	. . . . . . . . . 10 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → (𝑦 − 𝑧) = 0)
42	21, 24, 41	subeq0d 10999	. . . . . . . . 9 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → 𝑦 = 𝑧)
43		simplr 767	. . . . . . . . 9 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → 𝑦 ∈ 𝑥)
44	42, 43	eqeltrrd 2914	. . . . . . . 8 ⊢ (((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) ∧ 𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)) → 𝑧 ∈ 𝑥)
45	44	ex 415	. . . . . . 7 ⊢ ((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) → (𝑧 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) → 𝑧 ∈ 𝑥))
46	45	ssrdv 3973	. . . . . 6 ⊢ ((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) → ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ⊆ 𝑥)
47		eleq2 2901	. . . . . . . 8 ⊢ (𝑧 = ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) → (𝑦 ∈ 𝑧 ↔ 𝑦 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ)))
48		sseq1 3992	. . . . . . . 8 ⊢ (𝑧 = ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) → (𝑧 ⊆ 𝑥 ↔ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ⊆ 𝑥))
49	47, 48	anbi12d 632	. . . . . . 7 ⊢ (𝑧 = ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) → ((𝑦 ∈ 𝑧 ∧ 𝑧 ⊆ 𝑥) ↔ (𝑦 ∈ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ∧ ((𝑦(ball‘(abs ∘ − ))1) ∩ ℤ) ⊆ 𝑥)))
50	49	rspcev 3623	. . . . . 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))
51	15, 20, 46, 50	syl12anc 834	. . . . 5 ⊢ ((𝑥 ∈ 𝒫 ℤ ∧ 𝑦 ∈ 𝑥) → ∃𝑧 ∈ (𝐽 ↾_t ℤ)(𝑦 ∈ 𝑧 ∧ 𝑧 ⊆ 𝑥))
52	51	ralrimiva 3182	. . . 4 ⊢ (𝑥 ∈ 𝒫 ℤ → ∀𝑦 ∈ 𝑥 ∃𝑧 ∈ (𝐽 ↾_t ℤ)(𝑦 ∈ 𝑧 ∧ 𝑧 ⊆ 𝑥))
53		resttop 21762	. . . . . 6 ⊢ ((𝐽 ∈ Top ∧ ℤ ∈ V) → (𝐽 ↾_t ℤ) ∈ Top)
54	11, 12, 53	mp2an 690	. . . . 5 ⊢ (𝐽 ↾_t ℤ) ∈ Top
55		eltop2 21577	. . . . 5 ⊢ ((𝐽 ↾_t ℤ) ∈ Top → (𝑥 ∈ (𝐽 ↾_t ℤ) ↔ ∀𝑦 ∈ 𝑥 ∃𝑧 ∈ (𝐽 ↾_t ℤ)(𝑦 ∈ 𝑧 ∧ 𝑧 ⊆ 𝑥)))
56	54, 55	ax-mp 5	. . . 4 ⊢ (𝑥 ∈ (𝐽 ↾_t ℤ) ↔ ∀𝑦 ∈ 𝑥 ∃𝑧 ∈ (𝐽 ↾_t ℤ)(𝑦 ∈ 𝑧 ∧ 𝑧 ⊆ 𝑥))
57	52, 56	sylibr 236	. . 3 ⊢ (𝑥 ∈ 𝒫 ℤ → 𝑥 ∈ (𝐽 ↾_t ℤ))
58	57	ssriv 3971	. 2 ⊢ 𝒫 ℤ ⊆ (𝐽 ↾_t ℤ)
59	1, 58	eqssi 3983	1 ⊢ (𝐽 ↾_t ℤ) = 𝒫 ℤ

Colors of variables: wff setvar class

Syntax hints: ↔ wb 208 ∧ wa 398 = wceq 1533 ∈ wcel 2110 ∀wral 3138 ∃wrex 3139 Vcvv 3495 ∩ cin 3935 ⊆ wss 3936 𝒫 cpw 4539 class class class wbr 5059 ∘ ccom 5554 ‘cfv 6350 (class class class)co 7150 ℂcc 10529 0cc0 10531 1c1 10532 ℝ^*cxr 10668 < clt 10669 − cmin 10864 ℕ₀cn0 11891 ℤcz 11975 ℝ⁺crp 12383 abscabs 14587 ↾_t crest 16688 TopOpenctopn 16689 ∞Metcxmet 20524 ballcbl 20526 ℂ_fldccnfld 20539 Topctop 21495

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2156 ax-12 2172 ax-ext 2793 ax-rep 5183 ax-sep 5196 ax-nul 5203 ax-pow 5259 ax-pr 5322 ax-un 7455 ax-cnex 10587 ax-resscn 10588 ax-1cn 10589 ax-icn 10590 ax-addcl 10591 ax-addrcl 10592 ax-mulcl 10593 ax-mulrcl 10594 ax-mulcom 10595 ax-addass 10596 ax-mulass 10597 ax-distr 10598 ax-i2m1 10599 ax-1ne0 10600 ax-1rid 10601 ax-rnegex 10602 ax-rrecex 10603 ax-cnre 10604 ax-pre-lttri 10605 ax-pre-lttrn 10606 ax-pre-ltadd 10607 ax-pre-mulgt0 10608 ax-pre-sup 10609

This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 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-rmo 3146 df-rab 3147 df-v 3497 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4562 df-pr 4564 df-tp 4566 df-op 4568 df-uni 4833 df-int 4870 df-iun 4914 df-br 5060 df-opab 5122 df-mpt 5140 df-tr 5166 df-id 5455 df-eprel 5460 df-po 5469 df-so 5470 df-fr 5509 df-we 5511 df-xp 5556 df-rel 5557 df-cnv 5558 df-co 5559 df-dm 5560 df-rn 5561 df-res 5562 df-ima 5563 df-pred 6143 df-ord 6189 df-on 6190 df-lim 6191 df-suc 6192 df-iota 6309 df-fun 6352 df-fn 6353 df-f 6354 df-f1 6355 df-fo 6356 df-f1o 6357 df-fv 6358 df-riota 7108 df-ov 7153 df-oprab 7154 df-mpo 7155 df-om 7575 df-1st 7683 df-2nd 7684 df-wrecs 7941 df-recs 8002 df-rdg 8040 df-1o 8096 df-oadd 8100 df-er 8283 df-map 8402 df-en 8504 df-dom 8505 df-sdom 8506 df-fin 8507 df-fi 8869 df-sup 8900 df-inf 8901 df-pnf 10671 df-mnf 10672 df-xr 10673 df-ltxr 10674 df-le 10675 df-sub 10866 df-neg 10867 df-div 11292 df-nn 11633 df-2 11694 df-3 11695 df-4 11696 df-5 11697 df-6 11698 df-7 11699 df-8 11700 df-9 11701 df-n0 11892 df-z 11976 df-dec 12093 df-uz 12238 df-q 12343 df-rp 12384 df-xneg 12501 df-xadd 12502 df-xmul 12503 df-fz 12887 df-seq 13364 df-exp 13424 df-cj 14452 df-re 14453 df-im 14454 df-sqrt 14588 df-abs 14589 df-struct 16479 df-ndx 16480 df-slot 16481 df-base 16483 df-plusg 16572 df-mulr 16573 df-starv 16574 df-tset 16578 df-ple 16579 df-ds 16581 df-unif 16582 df-rest 16690 df-topn 16691 df-topgen 16711 df-psmet 20531 df-xmet 20532 df-met 20533 df-bl 20534 df-mopn 20535 df-cnfld 20540 df-top 21496 df-topon 21513 df-topsp 21535 df-bases 21548 df-xms 22924 df-ms 22925

This theorem is referenced by: sszcld 23419

W3C validator