qndenserrnbl - Mathbox for Glauco Siliprandi

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Theorem qndenserrnbl 44998

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 5307	. . . . . 6 ⊢ ∅ ∈ V
2	1	snid 4664	. . . . 5 ⊢ ∅ ∈ {∅}
3	2	a1i 11	. . . 4 ⊢ ((𝜑 ∧ 𝐼 = ∅) → ∅ ∈ {∅})
4		oveq2 7414	. . . . . 6 ⊢ (𝐼 = ∅ → (ℚ ↑_m 𝐼) = (ℚ ↑_m ∅))
5		qex 12942	. . . . . . . 8 ⊢ ℚ ∈ V
6		mapdm0 8833	. . . . . . . 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 2774	. . . . 5 ⊢ (𝐼 = ∅ → {∅} = (ℚ ↑_m 𝐼))
10	9	adantl 483	. . . 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 24921	. . . . . . . 8 ⊢ (𝐼 ∈ Fin → 𝐷 ∈ (Met‘(ℝ ↑_m 𝐼)))
15	12, 14	syl 17	. . . . . . 7 ⊢ (𝜑 → 𝐷 ∈ (Met‘(ℝ ↑_m 𝐼)))
16		metxmet 23832	. . . . . . 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 482	. . . . 5 ⊢ ((𝜑 ∧ 𝐼 = ∅) → 𝐷 ∈ (∞Met‘(ℝ ↑_m 𝐼)))
19		qndenserrnbl.x	. . . . . . . . . 10 ⊢ (𝜑 → 𝑋 ∈ (ℝ ↑_m 𝐼))
20	19	adantr 482	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐼 = ∅) → 𝑋 ∈ (ℝ ↑_m 𝐼))
21		oveq2 7414	. . . . . . . . . . 11 ⊢ (𝐼 = ∅ → (ℝ ↑_m 𝐼) = (ℝ ↑_m ∅))
22		reex 11198	. . . . . . . . . . . . 13 ⊢ ℝ ∈ V
23		mapdm0 8833	. . . . . . . . . . . . 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 2773	. . . . . . . . . 10 ⊢ (𝐼 = ∅ → (ℝ ↑_m 𝐼) = {∅})
27	26	adantl 483	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐼 = ∅) → (ℝ ↑_m 𝐼) = {∅})
28	20, 27	eleqtrd 2836	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐼 = ∅) → 𝑋 ∈ {∅})
29		elsng 4642	. . . . . . . . . 10 ⊢ (𝑋 ∈ (ℝ ↑_m 𝐼) → (𝑋 ∈ {∅} ↔ 𝑋 = ∅))
30	19, 29	syl 17	. . . . . . . . 9 ⊢ (𝜑 → (𝑋 ∈ {∅} ↔ 𝑋 = ∅))
31	30	adantr 482	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐼 = ∅) → (𝑋 ∈ {∅} ↔ 𝑋 = ∅))
32	28, 31	mpbid 231	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐼 = ∅) → 𝑋 = ∅)
33	32	eqcomd 2739	. . . . . 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 13014	. . . . . . 7 ⊢ (𝜑 → 𝐸 ∈ ℝ^*)
37	35	rpgt0d 13016	. . . . . . 7 ⊢ (𝜑 → 0 < 𝐸)
38	36, 37	jca 513	. . . . . 6 ⊢ (𝜑 → (𝐸 ∈ ℝ^* ∧ 0 < 𝐸))
39	38	adantr 482	. . . . 5 ⊢ ((𝜑 ∧ 𝐼 = ∅) → (𝐸 ∈ ℝ^* ∧ 0 < 𝐸))
40		xblcntr 23909	. . . . 5 ⊢ ((𝐷 ∈ (∞Met‘(ℝ ↑_m 𝐼)) ∧ ∅ ∈ (ℝ ↑_m 𝐼) ∧ (𝐸 ∈ ℝ^* ∧ 0 < 𝐸)) → ∅ ∈ (∅(ball‘𝐷)𝐸))
41	18, 34, 39, 40	syl3anc 1372	. . . 4 ⊢ ((𝜑 ∧ 𝐼 = ∅) → ∅ ∈ (∅(ball‘𝐷)𝐸))
42	33	oveq1d 7421	. . . 4 ⊢ ((𝜑 ∧ 𝐼 = ∅) → (∅(ball‘𝐷)𝐸) = (𝑋(ball‘𝐷)𝐸))
43	41, 42	eleqtrd 2836	. . 3 ⊢ ((𝜑 ∧ 𝐼 = ∅) → ∅ ∈ (𝑋(ball‘𝐷)𝐸))
44		eleq1 2822	. . . 4 ⊢ (𝑦 = ∅ → (𝑦 ∈ (𝑋(ball‘𝐷)𝐸) ↔ ∅ ∈ (𝑋(ball‘𝐷)𝐸)))
45	44	rspcev 3613	. . 3 ⊢ ((∅ ∈ (ℚ ↑_m 𝐼) ∧ ∅ ∈ (𝑋(ball‘𝐷)𝐸)) → ∃𝑦 ∈ (ℚ ↑_m 𝐼)𝑦 ∈ (𝑋(ball‘𝐷)𝐸))
46	11, 43, 45	syl2anc 585	. 2 ⊢ ((𝜑 ∧ 𝐼 = ∅) → ∃𝑦 ∈ (ℚ ↑_m 𝐼)𝑦 ∈ (𝑋(ball‘𝐷)𝐸))
47	12	adantr 482	. . 3 ⊢ ((𝜑 ∧ ¬ 𝐼 = ∅) → 𝐼 ∈ Fin)
48		neqne 2949	. . . 4 ⊢ (¬ 𝐼 = ∅ → 𝐼 ≠ ∅)
49	48	adantl 483	. . 3 ⊢ ((𝜑 ∧ ¬ 𝐼 = ∅) → 𝐼 ≠ ∅)
50	19	adantr 482	. . 3 ⊢ ((𝜑 ∧ ¬ 𝐼 = ∅) → 𝑋 ∈ (ℝ ↑_m 𝐼))
51	35	adantr 482	. . 3 ⊢ ((𝜑 ∧ ¬ 𝐼 = ∅) → 𝐸 ∈ ℝ⁺)
52	47, 49, 50, 13, 51	qndenserrnbllem 44997	. 2 ⊢ ((𝜑 ∧ ¬ 𝐼 = ∅) → ∃𝑦 ∈ (ℚ ↑_m 𝐼)𝑦 ∈ (𝑋(ball‘𝐷)𝐸))
53	46, 52	pm2.61dan 812	1 ⊢ (𝜑 → ∃𝑦 ∈ (ℚ ↑_m 𝐼)𝑦 ∈ (𝑋(ball‘𝐷)𝐸))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 397 = wceq 1542 ∈ wcel 2107 ≠ wne 2941 ∃wrex 3071 Vcvv 3475 ∅c0 4322 {csn 4628 class class class wbr 5148 ‘cfv 6541 (class class class)co 7406 ↑_m cmap 8817 Fincfn 8936 ℝcr 11106 0cc0 11107 ℝ^*cxr 11244 < clt 11245 ℚcq 12929 ℝ⁺crp 12971 distcds 17203 ∞Metcxmet 20922 Metcmet 20923 ballcbl 20924 ℝ^crrx 24892

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7722 ax-inf2 9633 ax-cnex 11163 ax-resscn 11164 ax-1cn 11165 ax-icn 11166 ax-addcl 11167 ax-addrcl 11168 ax-mulcl 11169 ax-mulrcl 11170 ax-mulcom 11171 ax-addass 11172 ax-mulass 11173 ax-distr 11174 ax-i2m1 11175 ax-1ne0 11176 ax-1rid 11177 ax-rnegex 11178 ax-rrecex 11179 ax-cnre 11180 ax-pre-lttri 11181 ax-pre-lttrn 11182 ax-pre-ltadd 11183 ax-pre-mulgt0 11184 ax-pre-sup 11185 ax-addf 11186 ax-mulf 11187

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-tp 4633 df-op 4635 df-uni 4909 df-int 4951 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-se 5632 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6298 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6493 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 df-fo 6547 df-f1o 6548 df-fv 6549 df-isom 6550 df-riota 7362 df-ov 7409 df-oprab 7410 df-mpo 7411 df-of 7667 df-om 7853 df-1st 7972 df-2nd 7973 df-supp 8144 df-tpos 8208 df-frecs 8263 df-wrecs 8294 df-recs 8368 df-rdg 8407 df-1o 8463 df-er 8700 df-map 8819 df-ixp 8889 df-en 8937 df-dom 8938 df-sdom 8939 df-fin 8940 df-fsupp 9359 df-sup 9434 df-inf 9435 df-oi 9502 df-card 9931 df-pnf 11247 df-mnf 11248 df-xr 11249 df-ltxr 11250 df-le 11251 df-sub 11443 df-neg 11444 df-div 11869 df-nn 12210 df-2 12272 df-3 12273 df-4 12274 df-5 12275 df-6 12276 df-7 12277 df-8 12278 df-9 12279 df-n0 12470 df-z 12556 df-dec 12675 df-uz 12820 df-q 12930 df-rp 12972 df-xadd 13090 df-ioo 13325 df-ico 13327 df-fz 13482 df-fzo 13625 df-seq 13964 df-exp 14025 df-hash 14288 df-cj 15043 df-re 15044 df-im 15045 df-sqrt 15179 df-abs 15180 df-clim 15429 df-sum 15630 df-struct 17077 df-sets 17094 df-slot 17112 df-ndx 17124 df-base 17142 df-ress 17171 df-plusg 17207 df-mulr 17208 df-starv 17209 df-sca 17210 df-vsca 17211 df-ip 17212 df-tset 17213 df-ple 17214 df-ds 17216 df-unif 17217 df-hom 17218 df-cco 17219 df-0g 17384 df-gsum 17385 df-prds 17390 df-pws 17392 df-mgm 18558 df-sgrp 18607 df-mnd 18623 df-mhm 18668 df-grp 18819 df-minusg 18820 df-sbg 18821 df-subg 18998 df-ghm 19085 df-cntz 19176 df-cmn 19645 df-abl 19646 df-mgp 19983 df-ur 20000 df-ring 20052 df-cring 20053 df-oppr 20143 df-dvdsr 20164 df-unit 20165 df-invr 20195 df-dvr 20208 df-rnghom 20244 df-drng 20310 df-field 20311 df-subrg 20354 df-staf 20446 df-srng 20447 df-lmod 20466 df-lss 20536 df-sra 20778 df-rgmod 20779 df-psmet 20929 df-xmet 20930 df-met 20931 df-bl 20932 df-cnfld 20938 df-refld 21150 df-dsmm 21279 df-frlm 21294 df-nm 24083 df-tng 24085 df-tcph 24678 df-rrx 24894

This theorem is referenced by: qndenserrnopnlem 45000

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