qndenserrnbl - Mathbox for Glauco Siliprandi

	Mathbox for Glauco Siliprandi		< Previous Next > Nearby theorems
Mirrors > Home > MPE Home > Th. List > Mathboxes > qndenserrnbl		Structured version Visualization version GIF version

Theorem qndenserrnbl 43465

Description: n-dimensional rational numbers are dense in the space of n-dimensional real numbers, with respect to the n-dimensional standard topology. (Contributed by Glauco Siliprandi, 24-Dec-2020.)

**Hypotheses**
Ref	Expression
qndenserrnbl.i	⊢ (𝜑 → 𝐼 ∈ Fin)
qndenserrnbl.x	⊢ (𝜑 → 𝑋 ∈ (ℝ ↑_m 𝐼))
qndenserrnbl.d	⊢ 𝐷 = (dist‘(ℝ^‘𝐼))
qndenserrnbl.e	⊢ (𝜑 → 𝐸 ∈ ℝ⁺)

**Assertion**
Ref	Expression
qndenserrnbl	⊢ (𝜑 → ∃𝑦 ∈ (ℚ ↑_m 𝐼)𝑦 ∈ (𝑋(ball‘𝐷)𝐸))

Distinct variable groups: 𝑦,𝐷 𝑦,𝐸 𝑦,𝐼 𝑦,𝑋 𝜑,𝑦

**Proof of Theorem qndenserrnbl**
Step	Hyp	Ref	Expression
1		0ex 5189	. . . . . 6 ⊢ ∅ ∈ V
2	1	snid 4567	. . . . 5 ⊢ ∅ ∈ {∅}
3	2	a1i 11	. . . 4 ⊢ ((𝜑 ∧ 𝐼 = ∅) → ∅ ∈ {∅})
4		oveq2 7210	. . . . . 6 ⊢ (𝐼 = ∅ → (ℚ ↑_m 𝐼) = (ℚ ↑_m ∅))
5		qex 12540	. . . . . . . 8 ⊢ ℚ ∈ V
6		mapdm0 8512	. . . . . . . 8 ⊢ (ℚ ∈ V → (ℚ ↑_m ∅) = {∅})
7	5, 6	ax-mp 5	. . . . . . 7 ⊢ (ℚ ↑_m ∅) = {∅}
8	7	a1i 11	. . . . . 6 ⊢ (𝐼 = ∅ → (ℚ ↑_m ∅) = {∅})
9	4, 8	eqtr2d 2775	. . . . 5 ⊢ (𝐼 = ∅ → {∅} = (ℚ ↑_m 𝐼))
10	9	adantl 485	. . . 4 ⊢ ((𝜑 ∧ 𝐼 = ∅) → {∅} = (ℚ ↑_m 𝐼))
11	3, 10	eleqtrd 2836	. . 3 ⊢ ((𝜑 ∧ 𝐼 = ∅) → ∅ ∈ (ℚ ↑_m 𝐼))
12		qndenserrnbl.i	. . . . . . . 8 ⊢ (𝜑 → 𝐼 ∈ Fin)
13		qndenserrnbl.d	. . . . . . . . 9 ⊢ 𝐷 = (dist‘(ℝ^‘𝐼))
14	13	rrxmetfi 24281	. . . . . . . 8 ⊢ (𝐼 ∈ Fin → 𝐷 ∈ (Met‘(ℝ ↑_m 𝐼)))
15	12, 14	syl 17	. . . . . . 7 ⊢ (𝜑 → 𝐷 ∈ (Met‘(ℝ ↑_m 𝐼)))
16		metxmet 23204	. . . . . . 7 ⊢ (𝐷 ∈ (Met‘(ℝ ↑_m 𝐼)) → 𝐷 ∈ (∞Met‘(ℝ ↑_m 𝐼)))
17	15, 16	syl 17	. . . . . 6 ⊢ (𝜑 → 𝐷 ∈ (∞Met‘(ℝ ↑_m 𝐼)))
18	17	adantr 484	. . . . 5 ⊢ ((𝜑 ∧ 𝐼 = ∅) → 𝐷 ∈ (∞Met‘(ℝ ↑_m 𝐼)))
19		qndenserrnbl.x	. . . . . . . . . 10 ⊢ (𝜑 → 𝑋 ∈ (ℝ ↑_m 𝐼))
20	19	adantr 484	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐼 = ∅) → 𝑋 ∈ (ℝ ↑_m 𝐼))
21		oveq2 7210	. . . . . . . . . . 11 ⊢ (𝐼 = ∅ → (ℝ ↑_m 𝐼) = (ℝ ↑_m ∅))
22		reex 10803	. . . . . . . . . . . . 13 ⊢ ℝ ∈ V
23		mapdm0 8512	. . . . . . . . . . . . 13 ⊢ (ℝ ∈ V → (ℝ ↑_m ∅) = {∅})
24	22, 23	ax-mp 5	. . . . . . . . . . . 12 ⊢ (ℝ ↑_m ∅) = {∅}
25	24	a1i 11	. . . . . . . . . . 11 ⊢ (𝐼 = ∅ → (ℝ ↑_m ∅) = {∅})
26	21, 25	eqtrd 2774	. . . . . . . . . 10 ⊢ (𝐼 = ∅ → (ℝ ↑_m 𝐼) = {∅})
27	26	adantl 485	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐼 = ∅) → (ℝ ↑_m 𝐼) = {∅})
28	20, 27	eleqtrd 2836	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐼 = ∅) → 𝑋 ∈ {∅})
29		elsng 4545	. . . . . . . . . 10 ⊢ (𝑋 ∈ (ℝ ↑_m 𝐼) → (𝑋 ∈ {∅} ↔ 𝑋 = ∅))
30	19, 29	syl 17	. . . . . . . . 9 ⊢ (𝜑 → (𝑋 ∈ {∅} ↔ 𝑋 = ∅))
31	30	adantr 484	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐼 = ∅) → (𝑋 ∈ {∅} ↔ 𝑋 = ∅))
32	28, 31	mpbid 235	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐼 = ∅) → 𝑋 = ∅)
33	32	eqcomd 2740	. . . . . 6 ⊢ ((𝜑 ∧ 𝐼 = ∅) → ∅ = 𝑋)
34	33, 20	eqeltrd 2834	. . . . 5 ⊢ ((𝜑 ∧ 𝐼 = ∅) → ∅ ∈ (ℝ ↑_m 𝐼))
35		qndenserrnbl.e	. . . . . . . 8 ⊢ (𝜑 → 𝐸 ∈ ℝ⁺)
36	35	rpxrd 12612	. . . . . . 7 ⊢ (𝜑 → 𝐸 ∈ ℝ^*)
37	35	rpgt0d 12614	. . . . . . 7 ⊢ (𝜑 → 0 < 𝐸)
38	36, 37	jca 515	. . . . . 6 ⊢ (𝜑 → (𝐸 ∈ ℝ^* ∧ 0 < 𝐸))
39	38	adantr 484	. . . . 5 ⊢ ((𝜑 ∧ 𝐼 = ∅) → (𝐸 ∈ ℝ^* ∧ 0 < 𝐸))
40		xblcntr 23281	. . . . 5 ⊢ ((𝐷 ∈ (∞Met‘(ℝ ↑_m 𝐼)) ∧ ∅ ∈ (ℝ ↑_m 𝐼) ∧ (𝐸 ∈ ℝ^* ∧ 0 < 𝐸)) → ∅ ∈ (∅(ball‘𝐷)𝐸))
41	18, 34, 39, 40	syl3anc 1373	. . . 4 ⊢ ((𝜑 ∧ 𝐼 = ∅) → ∅ ∈ (∅(ball‘𝐷)𝐸))
42	33	oveq1d 7217	. . . 4 ⊢ ((𝜑 ∧ 𝐼 = ∅) → (∅(ball‘𝐷)𝐸) = (𝑋(ball‘𝐷)𝐸))
43	41, 42	eleqtrd 2836	. . 3 ⊢ ((𝜑 ∧ 𝐼 = ∅) → ∅ ∈ (𝑋(ball‘𝐷)𝐸))
44		eleq1 2821	. . . 4 ⊢ (𝑦 = ∅ → (𝑦 ∈ (𝑋(ball‘𝐷)𝐸) ↔ ∅ ∈ (𝑋(ball‘𝐷)𝐸)))
45	44	rspcev 3530	. . 3 ⊢ ((∅ ∈ (ℚ ↑_m 𝐼) ∧ ∅ ∈ (𝑋(ball‘𝐷)𝐸)) → ∃𝑦 ∈ (ℚ ↑_m 𝐼)𝑦 ∈ (𝑋(ball‘𝐷)𝐸))
46	11, 43, 45	syl2anc 587	. 2 ⊢ ((𝜑 ∧ 𝐼 = ∅) → ∃𝑦 ∈ (ℚ ↑_m 𝐼)𝑦 ∈ (𝑋(ball‘𝐷)𝐸))
47	12	adantr 484	. . 3 ⊢ ((𝜑 ∧ ¬ 𝐼 = ∅) → 𝐼 ∈ Fin)
48		neqne 2943	. . . 4 ⊢ (¬ 𝐼 = ∅ → 𝐼 ≠ ∅)
49	48	adantl 485	. . 3 ⊢ ((𝜑 ∧ ¬ 𝐼 = ∅) → 𝐼 ≠ ∅)
50	19	adantr 484	. . 3 ⊢ ((𝜑 ∧ ¬ 𝐼 = ∅) → 𝑋 ∈ (ℝ ↑_m 𝐼))
51	35	adantr 484	. . 3 ⊢ ((𝜑 ∧ ¬ 𝐼 = ∅) → 𝐸 ∈ ℝ⁺)
52	47, 49, 50, 13, 51	qndenserrnbllem 43464	. 2 ⊢ ((𝜑 ∧ ¬ 𝐼 = ∅) → ∃𝑦 ∈ (ℚ ↑_m 𝐼)𝑦 ∈ (𝑋(ball‘𝐷)𝐸))
53	46, 52	pm2.61dan 813	1 ⊢ (𝜑 → ∃𝑦 ∈ (ℚ ↑_m 𝐼)𝑦 ∈ (𝑋(ball‘𝐷)𝐸))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 399 = wceq 1543 ∈ wcel 2110 ≠ wne 2935 ∃wrex 3055 Vcvv 3401 ∅c0 4227 {csn 4531 class class class wbr 5043 ‘cfv 6369 (class class class)co 7202 ↑_m cmap 8497 Fincfn 8615 ℝcr 10711 0cc0 10712 ℝ^*cxr 10849 < clt 10850 ℚcq 12527 ℝ⁺crp 12569 distcds 16776 ∞Metcxmet 20320 Metcmet 20321 ballcbl 20322 ℝ^crrx 24252

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2016 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2158 ax-12 2175 ax-ext 2706 ax-rep 5168 ax-sep 5181 ax-nul 5188 ax-pow 5247 ax-pr 5311 ax-un 7512 ax-inf2 9245 ax-cnex 10768 ax-resscn 10769 ax-1cn 10770 ax-icn 10771 ax-addcl 10772 ax-addrcl 10773 ax-mulcl 10774 ax-mulrcl 10775 ax-mulcom 10776 ax-addass 10777 ax-mulass 10778 ax-distr 10779 ax-i2m1 10780 ax-1ne0 10781 ax-1rid 10782 ax-rnegex 10783 ax-rrecex 10784 ax-cnre 10785 ax-pre-lttri 10786 ax-pre-lttrn 10787 ax-pre-ltadd 10788 ax-pre-mulgt0 10789 ax-pre-sup 10790 ax-addf 10791 ax-mulf 10792

This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3or 1090 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2071 df-mo 2537 df-eu 2566 df-clab 2713 df-cleq 2726 df-clel 2812 df-nfc 2882 df-ne 2936 df-nel 3040 df-ral 3059 df-rex 3060 df-reu 3061 df-rmo 3062 df-rab 3063 df-v 3403 df-sbc 3688 df-csb 3803 df-dif 3860 df-un 3862 df-in 3864 df-ss 3874 df-pss 3876 df-nul 4228 df-if 4430 df-pw 4505 df-sn 4532 df-pr 4534 df-tp 4536 df-op 4538 df-uni 4810 df-int 4850 df-iun 4896 df-br 5044 df-opab 5106 df-mpt 5125 df-tr 5151 df-id 5444 df-eprel 5449 df-po 5457 df-so 5458 df-fr 5498 df-se 5499 df-we 5500 df-xp 5546 df-rel 5547 df-cnv 5548 df-co 5549 df-dm 5550 df-rn 5551 df-res 5552 df-ima 5553 df-pred 6149 df-ord 6205 df-on 6206 df-lim 6207 df-suc 6208 df-iota 6327 df-fun 6371 df-fn 6372 df-f 6373 df-f1 6374 df-fo 6375 df-f1o 6376 df-fv 6377 df-isom 6378 df-riota 7159 df-ov 7205 df-oprab 7206 df-mpo 7207 df-of 7458 df-om 7634 df-1st 7750 df-2nd 7751 df-supp 7893 df-tpos 7957 df-wrecs 8036 df-recs 8097 df-rdg 8135 df-1o 8191 df-er 8380 df-map 8499 df-ixp 8568 df-en 8616 df-dom 8617 df-sdom 8618 df-fin 8619 df-fsupp 8975 df-sup 9047 df-inf 9048 df-oi 9115 df-card 9538 df-pnf 10852 df-mnf 10853 df-xr 10854 df-ltxr 10855 df-le 10856 df-sub 11047 df-neg 11048 df-div 11473 df-nn 11814 df-2 11876 df-3 11877 df-4 11878 df-5 11879 df-6 11880 df-7 11881 df-8 11882 df-9 11883 df-n0 12074 df-z 12160 df-dec 12277 df-uz 12422 df-q 12528 df-rp 12570 df-xadd 12688 df-ioo 12922 df-ico 12924 df-fz 13079 df-fzo 13222 df-seq 13558 df-exp 13619 df-hash 13880 df-cj 14645 df-re 14646 df-im 14647 df-sqrt 14781 df-abs 14782 df-clim 15032 df-sum 15233 df-struct 16686 df-ndx 16687 df-slot 16688 df-base 16690 df-sets 16691 df-ress 16692 df-plusg 16780 df-mulr 16781 df-starv 16782 df-sca 16783 df-vsca 16784 df-ip 16785 df-tset 16786 df-ple 16787 df-ds 16789 df-unif 16790 df-hom 16791 df-cco 16792 df-0g 16918 df-gsum 16919 df-prds 16924 df-pws 16926 df-mgm 18086 df-sgrp 18135 df-mnd 18146 df-mhm 18190 df-grp 18340 df-minusg 18341 df-sbg 18342 df-subg 18512 df-ghm 18592 df-cntz 18683 df-cmn 19144 df-abl 19145 df-mgp 19477 df-ur 19489 df-ring 19536 df-cring 19537 df-oppr 19613 df-dvdsr 19631 df-unit 19632 df-invr 19662 df-dvr 19673 df-rnghom 19707 df-drng 19741 df-field 19742 df-subrg 19770 df-staf 19853 df-srng 19854 df-lmod 19873 df-lss 19941 df-sra 20181 df-rgmod 20182 df-psmet 20327 df-xmet 20328 df-met 20329 df-bl 20330 df-cnfld 20336 df-refld 20539 df-dsmm 20666 df-frlm 20681 df-nm 23452 df-tng 23454 df-tcph 24038 df-rrx 24254

This theorem is referenced by: qndenserrnopnlem 43467

W3C validator