qndenserrnopnlem - Mathbox for Glauco Siliprandi

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Theorem qndenserrnopnlem 46274

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
qndenserrnopnlem.i	⊢ (𝜑 → 𝐼 ∈ Fin)
qndenserrnopnlem.j	⊢ 𝐽 = (TopOpen‘(ℝ^‘𝐼))
qndenserrnopnlem.v	⊢ (𝜑 → 𝑉 ∈ 𝐽)
qndenserrnopnlem.x	⊢ (𝜑 → 𝑋 ∈ 𝑉)
qndenserrnopnlem.d	⊢ 𝐷 = (dist‘(ℝ^‘𝐼))

**Assertion**
Ref	Expression
qndenserrnopnlem	⊢ (𝜑 → ∃𝑦 ∈ (ℚ ↑_m 𝐼)𝑦 ∈ 𝑉)

Distinct variable groups: 𝑦,𝐷 𝑦,𝐼 𝑦,𝑉 𝑦,𝑋 𝜑,𝑦 Allowed substitution hint: 𝐽(𝑦)

Proof of Theorem qndenserrnopnlem Dummy variables 𝑒 𝑓 𝑔 𝑘 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		qndenserrnopnlem.i	. . . . 5 ⊢ (𝜑 → 𝐼 ∈ Fin)
2		qndenserrnopnlem.d	. . . . . 6 ⊢ 𝐷 = (dist‘(ℝ^‘𝐼))
3	2	rrxmetfi 25362	. . . . 5 ⊢ (𝐼 ∈ Fin → 𝐷 ∈ (Met‘(ℝ ↑_m 𝐼)))
4	1, 3	syl 17	. . . 4 ⊢ (𝜑 → 𝐷 ∈ (Met‘(ℝ ↑_m 𝐼)))
5		metxmet 24271	. . . 4 ⊢ (𝐷 ∈ (Met‘(ℝ ↑_m 𝐼)) → 𝐷 ∈ (∞Met‘(ℝ ↑_m 𝐼)))
6	4, 5	syl 17	. . 3 ⊢ (𝜑 → 𝐷 ∈ (∞Met‘(ℝ ↑_m 𝐼)))
7		qndenserrnopnlem.v	. . . . 5 ⊢ (𝜑 → 𝑉 ∈ 𝐽)
8		qndenserrnopnlem.j	. . . . 5 ⊢ 𝐽 = (TopOpen‘(ℝ^‘𝐼))
9	7, 8	eleqtrdi 2844	. . . 4 ⊢ (𝜑 → 𝑉 ∈ (TopOpen‘(ℝ^‘𝐼)))
10	1	rrxtopnfi 46264	. . . . 5 ⊢ (𝜑 → (TopOpen‘(ℝ^‘𝐼)) = (MetOpen‘(𝑓 ∈ (ℝ ↑_m 𝐼), 𝑔 ∈ (ℝ ↑_m 𝐼) ↦ (√‘Σ𝑘 ∈ 𝐼 (((𝑓‘𝑘) − (𝑔‘𝑘))↑2)))))
11	2	a1i 11	. . . . . . 7 ⊢ (𝜑 → 𝐷 = (dist‘(ℝ^‘𝐼)))
12		eqid 2735	. . . . . . . . 9 ⊢ (ℝ^‘𝐼) = (ℝ^‘𝐼)
13		eqid 2735	. . . . . . . . 9 ⊢ (ℝ ↑_m 𝐼) = (ℝ ↑_m 𝐼)
14	12, 13	rrxdsfi 25361	. . . . . . . 8 ⊢ (𝐼 ∈ Fin → (dist‘(ℝ^‘𝐼)) = (𝑓 ∈ (ℝ ↑_m 𝐼), 𝑔 ∈ (ℝ ↑_m 𝐼) ↦ (√‘Σ𝑘 ∈ 𝐼 (((𝑓‘𝑘) − (𝑔‘𝑘))↑2))))
15	1, 14	syl 17	. . . . . . 7 ⊢ (𝜑 → (dist‘(ℝ^‘𝐼)) = (𝑓 ∈ (ℝ ↑_m 𝐼), 𝑔 ∈ (ℝ ↑_m 𝐼) ↦ (√‘Σ𝑘 ∈ 𝐼 (((𝑓‘𝑘) − (𝑔‘𝑘))↑2))))
16	11, 15	eqtr2d 2771	. . . . . 6 ⊢ (𝜑 → (𝑓 ∈ (ℝ ↑_m 𝐼), 𝑔 ∈ (ℝ ↑_m 𝐼) ↦ (√‘Σ𝑘 ∈ 𝐼 (((𝑓‘𝑘) − (𝑔‘𝑘))↑2))) = 𝐷)
17	16	fveq2d 6879	. . . . 5 ⊢ (𝜑 → (MetOpen‘(𝑓 ∈ (ℝ ↑_m 𝐼), 𝑔 ∈ (ℝ ↑_m 𝐼) ↦ (√‘Σ𝑘 ∈ 𝐼 (((𝑓‘𝑘) − (𝑔‘𝑘))↑2)))) = (MetOpen‘𝐷))
18	10, 17	eqtrd 2770	. . . 4 ⊢ (𝜑 → (TopOpen‘(ℝ^‘𝐼)) = (MetOpen‘𝐷))
19	9, 18	eleqtrd 2836	. . 3 ⊢ (𝜑 → 𝑉 ∈ (MetOpen‘𝐷))
20		qndenserrnopnlem.x	. . 3 ⊢ (𝜑 → 𝑋 ∈ 𝑉)
21		eqid 2735	. . . 4 ⊢ (MetOpen‘𝐷) = (MetOpen‘𝐷)
22	21	mopni2 24430	. . 3 ⊢ ((𝐷 ∈ (∞Met‘(ℝ ↑_m 𝐼)) ∧ 𝑉 ∈ (MetOpen‘𝐷) ∧ 𝑋 ∈ 𝑉) → ∃𝑒 ∈ ℝ⁺ (𝑋(ball‘𝐷)𝑒) ⊆ 𝑉)
23	6, 19, 20, 22	syl3anc 1373	. 2 ⊢ (𝜑 → ∃𝑒 ∈ ℝ⁺ (𝑋(ball‘𝐷)𝑒) ⊆ 𝑉)
24	1	3ad2ant1 1133	. . . . . 6 ⊢ ((𝜑 ∧ 𝑒 ∈ ℝ⁺ ∧ (𝑋(ball‘𝐷)𝑒) ⊆ 𝑉) → 𝐼 ∈ Fin)
25		rrxtps 46263	. . . . . . . . . . . 12 ⊢ (𝐼 ∈ Fin → (ℝ^‘𝐼) ∈ TopSp)
26	1, 25	syl 17	. . . . . . . . . . 11 ⊢ (𝜑 → (ℝ^‘𝐼) ∈ TopSp)
27		eqid 2735	. . . . . . . . . . . 12 ⊢ (Base‘(ℝ^‘𝐼)) = (Base‘(ℝ^‘𝐼))
28	27, 8	istps 22870	. . . . . . . . . . 11 ⊢ ((ℝ^‘𝐼) ∈ TopSp ↔ 𝐽 ∈ (TopOn‘(Base‘(ℝ^‘𝐼))))
29	26, 28	sylib 218	. . . . . . . . . 10 ⊢ (𝜑 → 𝐽 ∈ (TopOn‘(Base‘(ℝ^‘𝐼))))
30	1, 12, 27	rrxbasefi 25360	. . . . . . . . . . 11 ⊢ (𝜑 → (Base‘(ℝ^‘𝐼)) = (ℝ ↑_m 𝐼))
31	30	fveq2d 6879	. . . . . . . . . 10 ⊢ (𝜑 → (TopOn‘(Base‘(ℝ^‘𝐼))) = (TopOn‘(ℝ ↑_m 𝐼)))
32	29, 31	eleqtrd 2836	. . . . . . . . 9 ⊢ (𝜑 → 𝐽 ∈ (TopOn‘(ℝ ↑_m 𝐼)))
33		toponss 22863	. . . . . . . . 9 ⊢ ((𝐽 ∈ (TopOn‘(ℝ ↑_m 𝐼)) ∧ 𝑉 ∈ 𝐽) → 𝑉 ⊆ (ℝ ↑_m 𝐼))
34	32, 7, 33	syl2anc 584	. . . . . . . 8 ⊢ (𝜑 → 𝑉 ⊆ (ℝ ↑_m 𝐼))
35	34, 20	sseldd 3959	. . . . . . 7 ⊢ (𝜑 → 𝑋 ∈ (ℝ ↑_m 𝐼))
36	35	3ad2ant1 1133	. . . . . 6 ⊢ ((𝜑 ∧ 𝑒 ∈ ℝ⁺ ∧ (𝑋(ball‘𝐷)𝑒) ⊆ 𝑉) → 𝑋 ∈ (ℝ ↑_m 𝐼))
37		simp2 1137	. . . . . 6 ⊢ ((𝜑 ∧ 𝑒 ∈ ℝ⁺ ∧ (𝑋(ball‘𝐷)𝑒) ⊆ 𝑉) → 𝑒 ∈ ℝ⁺)
38	24, 36, 2, 37	qndenserrnbl 46272	. . . . 5 ⊢ ((𝜑 ∧ 𝑒 ∈ ℝ⁺ ∧ (𝑋(ball‘𝐷)𝑒) ⊆ 𝑉) → ∃𝑦 ∈ (ℚ ↑_m 𝐼)𝑦 ∈ (𝑋(ball‘𝐷)𝑒))
39		ssel 3952	. . . . . . . 8 ⊢ ((𝑋(ball‘𝐷)𝑒) ⊆ 𝑉 → (𝑦 ∈ (𝑋(ball‘𝐷)𝑒) → 𝑦 ∈ 𝑉))
40	39	adantr 480	. . . . . . 7 ⊢ (((𝑋(ball‘𝐷)𝑒) ⊆ 𝑉 ∧ 𝑦 ∈ (ℚ ↑_m 𝐼)) → (𝑦 ∈ (𝑋(ball‘𝐷)𝑒) → 𝑦 ∈ 𝑉))
41	40	3ad2antl3 1188	. . . . . 6 ⊢ (((𝜑 ∧ 𝑒 ∈ ℝ⁺ ∧ (𝑋(ball‘𝐷)𝑒) ⊆ 𝑉) ∧ 𝑦 ∈ (ℚ ↑_m 𝐼)) → (𝑦 ∈ (𝑋(ball‘𝐷)𝑒) → 𝑦 ∈ 𝑉))
42	41	reximdva 3153	. . . . 5 ⊢ ((𝜑 ∧ 𝑒 ∈ ℝ⁺ ∧ (𝑋(ball‘𝐷)𝑒) ⊆ 𝑉) → (∃𝑦 ∈ (ℚ ↑_m 𝐼)𝑦 ∈ (𝑋(ball‘𝐷)𝑒) → ∃𝑦 ∈ (ℚ ↑_m 𝐼)𝑦 ∈ 𝑉))
43	38, 42	mpd 15	. . . 4 ⊢ ((𝜑 ∧ 𝑒 ∈ ℝ⁺ ∧ (𝑋(ball‘𝐷)𝑒) ⊆ 𝑉) → ∃𝑦 ∈ (ℚ ↑_m 𝐼)𝑦 ∈ 𝑉)
44	43	3exp 1119	. . 3 ⊢ (𝜑 → (𝑒 ∈ ℝ⁺ → ((𝑋(ball‘𝐷)𝑒) ⊆ 𝑉 → ∃𝑦 ∈ (ℚ ↑_m 𝐼)𝑦 ∈ 𝑉)))
45	44	rexlimdv 3139	. 2 ⊢ (𝜑 → (∃𝑒 ∈ ℝ⁺ (𝑋(ball‘𝐷)𝑒) ⊆ 𝑉 → ∃𝑦 ∈ (ℚ ↑_m 𝐼)𝑦 ∈ 𝑉))
46	23, 45	mpd 15	1 ⊢ (𝜑 → ∃𝑦 ∈ (ℚ ↑_m 𝐼)𝑦 ∈ 𝑉)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ w3a 1086 = wceq 1540 ∈ wcel 2108 ∃wrex 3060 ⊆ wss 3926 ‘cfv 6530 (class class class)co 7403 ∈ cmpo 7405 ↑_m cmap 8838 Fincfn 8957 ℝcr 11126 − cmin 11464 2c2 12293 ℚcq 12962 ℝ⁺crp 13006 ↑cexp 14077 √csqrt 15250 Σcsu 15700 Basecbs 17226 distcds 17278 TopOpenctopn 17433 ∞Metcxmet 21298 Metcmet 21299 ballcbl 21300 MetOpencmopn 21303 TopOnctopon 22846 TopSpctps 22868 ℝ^crrx 25333

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2707 ax-rep 5249 ax-sep 5266 ax-nul 5276 ax-pow 5335 ax-pr 5402 ax-un 7727 ax-inf2 9653 ax-cnex 11183 ax-resscn 11184 ax-1cn 11185 ax-icn 11186 ax-addcl 11187 ax-addrcl 11188 ax-mulcl 11189 ax-mulrcl 11190 ax-mulcom 11191 ax-addass 11192 ax-mulass 11193 ax-distr 11194 ax-i2m1 11195 ax-1ne0 11196 ax-1rid 11197 ax-rnegex 11198 ax-rrecex 11199 ax-cnre 11200 ax-pre-lttri 11201 ax-pre-lttrn 11202 ax-pre-ltadd 11203 ax-pre-mulgt0 11204 ax-pre-sup 11205 ax-addf 11206 ax-mulf 11207

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2539 df-eu 2568 df-clab 2714 df-cleq 2727 df-clel 2809 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3359 df-reu 3360 df-rab 3416 df-v 3461 df-sbc 3766 df-csb 3875 df-dif 3929 df-un 3931 df-in 3933 df-ss 3943 df-pss 3946 df-nul 4309 df-if 4501 df-pw 4577 df-sn 4602 df-pr 4604 df-tp 4606 df-op 4608 df-uni 4884 df-int 4923 df-iun 4969 df-br 5120 df-opab 5182 df-mpt 5202 df-tr 5230 df-id 5548 df-eprel 5553 df-po 5561 df-so 5562 df-fr 5606 df-se 5607 df-we 5608 df-xp 5660 df-rel 5661 df-cnv 5662 df-co 5663 df-dm 5664 df-rn 5665 df-res 5666 df-ima 5667 df-pred 6290 df-ord 6355 df-on 6356 df-lim 6357 df-suc 6358 df-iota 6483 df-fun 6532 df-fn 6533 df-f 6534 df-f1 6535 df-fo 6536 df-f1o 6537 df-fv 6538 df-isom 6539 df-riota 7360 df-ov 7406 df-oprab 7407 df-mpo 7408 df-of 7669 df-om 7860 df-1st 7986 df-2nd 7987 df-supp 8158 df-tpos 8223 df-frecs 8278 df-wrecs 8309 df-recs 8383 df-rdg 8422 df-1o 8478 df-er 8717 df-map 8840 df-ixp 8910 df-en 8958 df-dom 8959 df-sdom 8960 df-fin 8961 df-fsupp 9372 df-sup 9452 df-inf 9453 df-oi 9522 df-card 9951 df-pnf 11269 df-mnf 11270 df-xr 11271 df-ltxr 11272 df-le 11273 df-sub 11466 df-neg 11467 df-div 11893 df-nn 12239 df-2 12301 df-3 12302 df-4 12303 df-5 12304 df-6 12305 df-7 12306 df-8 12307 df-9 12308 df-n0 12500 df-z 12587 df-dec 12707 df-uz 12851 df-q 12963 df-rp 13007 df-xneg 13126 df-xadd 13127 df-xmul 13128 df-ioo 13364 df-ico 13366 df-fz 13523 df-fzo 13670 df-seq 14018 df-exp 14078 df-hash 14347 df-cj 15116 df-re 15117 df-im 15118 df-sqrt 15252 df-abs 15253 df-clim 15502 df-sum 15701 df-struct 17164 df-sets 17181 df-slot 17199 df-ndx 17211 df-base 17227 df-ress 17250 df-plusg 17282 df-mulr 17283 df-starv 17284 df-sca 17285 df-vsca 17286 df-ip 17287 df-tset 17288 df-ple 17289 df-ds 17291 df-unif 17292 df-hom 17293 df-cco 17294 df-rest 17434 df-topn 17435 df-0g 17453 df-gsum 17454 df-topgen 17455 df-prds 17459 df-pws 17461 df-mgm 18616 df-sgrp 18695 df-mnd 18711 df-mhm 18759 df-submnd 18760 df-grp 18917 df-minusg 18918 df-sbg 18919 df-subg 19104 df-ghm 19194 df-cntz 19298 df-cmn 19761 df-abl 19762 df-mgp 20099 df-rng 20111 df-ur 20140 df-ring 20193 df-cring 20194 df-oppr 20295 df-dvdsr 20315 df-unit 20316 df-invr 20346 df-dvr 20359 df-rhm 20430 df-subrng 20504 df-subrg 20528 df-drng 20689 df-field 20690 df-abv 20767 df-staf 20797 df-srng 20798 df-lmod 20817 df-lss 20887 df-lmhm 20978 df-lvec 21059 df-sra 21129 df-rgmod 21130 df-psmet 21305 df-xmet 21306 df-met 21307 df-bl 21308 df-mopn 21309 df-cnfld 21314 df-refld 21563 df-phl 21584 df-dsmm 21690 df-frlm 21705 df-top 22830 df-topon 22847 df-topsp 22869 df-bases 22882 df-xms 24257 df-ms 24258 df-nm 24519 df-ngp 24520 df-tng 24521 df-nrg 24522 df-nlm 24523 df-clm 25012 df-cph 25118 df-tcph 25119 df-rrx 25335

This theorem is referenced by: qndenserrnopn 46275

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