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Theorem cfil3i 25210

Description: A Cauchy filter contains balls of any pre-chosen size. (Contributed by Mario Carneiro, 15-Oct-2015.)

**Assertion**
Ref	Expression
cfil3i	⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) → ∃𝑥 ∈ 𝑋 (𝑥(ball‘𝐷)𝑅) ∈ 𝐹)

Distinct variable groups: 𝑥,𝐹 𝑥,𝑋 𝑥,𝑅 𝑥,𝐷

Proof of Theorem cfil3i Dummy variables 𝑠 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		cfili 25209	. . 3 ⊢ ((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) → ∃𝑠 ∈ 𝐹 ∀𝑥 ∈ 𝑠 ∀𝑦 ∈ 𝑠 (𝑥𝐷𝑦) < 𝑅)
2	1	3adant1 1128	. 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) → ∃𝑠 ∈ 𝐹 ∀𝑥 ∈ 𝑠 ∀𝑦 ∈ 𝑠 (𝑥𝐷𝑦) < 𝑅)
3		cfilfil 25208	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷)) → 𝐹 ∈ (Fil‘𝑋))
4	3	3adant3 1130	. . . . . 6 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) → 𝐹 ∈ (Fil‘𝑋))
5		fileln0 23767	. . . . . 6 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑠 ∈ 𝐹) → 𝑠 ≠ ∅)
6	4, 5	sylan 579	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) → 𝑠 ≠ ∅)
7		r19.2z 4495	. . . . . 6 ⊢ ((𝑠 ≠ ∅ ∧ ∀𝑥 ∈ 𝑠 ∀𝑦 ∈ 𝑠 (𝑥𝐷𝑦) < 𝑅) → ∃𝑥 ∈ 𝑠 ∀𝑦 ∈ 𝑠 (𝑥𝐷𝑦) < 𝑅)
8	7	ex 412	. . . . 5 ⊢ (𝑠 ≠ ∅ → (∀𝑥 ∈ 𝑠 ∀𝑦 ∈ 𝑠 (𝑥𝐷𝑦) < 𝑅 → ∃𝑥 ∈ 𝑠 ∀𝑦 ∈ 𝑠 (𝑥𝐷𝑦) < 𝑅))
9	6, 8	syl 17	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) → (∀𝑥 ∈ 𝑠 ∀𝑦 ∈ 𝑠 (𝑥𝐷𝑦) < 𝑅 → ∃𝑥 ∈ 𝑠 ∀𝑦 ∈ 𝑠 (𝑥𝐷𝑦) < 𝑅))
10		filelss 23769	. . . . . 6 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑠 ∈ 𝐹) → 𝑠 ⊆ 𝑋)
11	4, 10	sylan 579	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) → 𝑠 ⊆ 𝑋)
12		ssrexv 4049	. . . . 5 ⊢ (𝑠 ⊆ 𝑋 → (∃𝑥 ∈ 𝑠 ∀𝑦 ∈ 𝑠 (𝑥𝐷𝑦) < 𝑅 → ∃𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑠 (𝑥𝐷𝑦) < 𝑅))
13	11, 12	syl 17	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) → (∃𝑥 ∈ 𝑠 ∀𝑦 ∈ 𝑠 (𝑥𝐷𝑦) < 𝑅 → ∃𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑠 (𝑥𝐷𝑦) < 𝑅))
14		dfss3 3968	. . . . . . 7 ⊢ (𝑠 ⊆ (𝑥(ball‘𝐷)𝑅) ↔ ∀𝑦 ∈ 𝑠 𝑦 ∈ (𝑥(ball‘𝐷)𝑅))
15		simpl1 1189	. . . . . . . . . 10 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) → 𝐷 ∈ (∞Met‘𝑋))
16	15	ad2antrr 725	. . . . . . . . 9 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) ∧ 𝑥 ∈ 𝑋) ∧ 𝑦 ∈ 𝑠) → 𝐷 ∈ (∞Met‘𝑋))
17		simpll3 1212	. . . . . . . . . . 11 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) ∧ 𝑥 ∈ 𝑋) → 𝑅 ∈ ℝ⁺)
18	17	rpxrd 13050	. . . . . . . . . 10 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) ∧ 𝑥 ∈ 𝑋) → 𝑅 ∈ ℝ^*)
19	18	adantr 480	. . . . . . . . 9 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) ∧ 𝑥 ∈ 𝑋) ∧ 𝑦 ∈ 𝑠) → 𝑅 ∈ ℝ^*)
20		simplr 768	. . . . . . . . 9 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) ∧ 𝑥 ∈ 𝑋) ∧ 𝑦 ∈ 𝑠) → 𝑥 ∈ 𝑋)
21	11	adantr 480	. . . . . . . . . 10 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) ∧ 𝑥 ∈ 𝑋) → 𝑠 ⊆ 𝑋)
22	21	sselda 3980	. . . . . . . . 9 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) ∧ 𝑥 ∈ 𝑋) ∧ 𝑦 ∈ 𝑠) → 𝑦 ∈ 𝑋)
23		elbl2 24309	. . . . . . . . 9 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^*) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑦 ∈ (𝑥(ball‘𝐷)𝑅) ↔ (𝑥𝐷𝑦) < 𝑅))
24	16, 19, 20, 22, 23	syl22anc 838	. . . . . . . 8 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) ∧ 𝑥 ∈ 𝑋) ∧ 𝑦 ∈ 𝑠) → (𝑦 ∈ (𝑥(ball‘𝐷)𝑅) ↔ (𝑥𝐷𝑦) < 𝑅))
25	24	ralbidva 3172	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) ∧ 𝑥 ∈ 𝑋) → (∀𝑦 ∈ 𝑠 𝑦 ∈ (𝑥(ball‘𝐷)𝑅) ↔ ∀𝑦 ∈ 𝑠 (𝑥𝐷𝑦) < 𝑅))
26	14, 25	bitrid 283	. . . . . 6 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) ∧ 𝑥 ∈ 𝑋) → (𝑠 ⊆ (𝑥(ball‘𝐷)𝑅) ↔ ∀𝑦 ∈ 𝑠 (𝑥𝐷𝑦) < 𝑅))
27	4	ad2antrr 725	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) ∧ 𝑥 ∈ 𝑋) → 𝐹 ∈ (Fil‘𝑋))
28		simplr 768	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) ∧ 𝑥 ∈ 𝑋) → 𝑠 ∈ 𝐹)
29	15	adantr 480	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) ∧ 𝑥 ∈ 𝑋) → 𝐷 ∈ (∞Met‘𝑋))
30		simpr 484	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) ∧ 𝑥 ∈ 𝑋) → 𝑥 ∈ 𝑋)
31		blssm 24337	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → (𝑥(ball‘𝐷)𝑅) ⊆ 𝑋)
32	29, 30, 18, 31	syl3anc 1369	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) ∧ 𝑥 ∈ 𝑋) → (𝑥(ball‘𝐷)𝑅) ⊆ 𝑋)
33		filss 23770	. . . . . . . 8 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ (𝑠 ∈ 𝐹 ∧ (𝑥(ball‘𝐷)𝑅) ⊆ 𝑋 ∧ 𝑠 ⊆ (𝑥(ball‘𝐷)𝑅))) → (𝑥(ball‘𝐷)𝑅) ∈ 𝐹)
34	33	3exp2 1352	. . . . . . 7 ⊢ (𝐹 ∈ (Fil‘𝑋) → (𝑠 ∈ 𝐹 → ((𝑥(ball‘𝐷)𝑅) ⊆ 𝑋 → (𝑠 ⊆ (𝑥(ball‘𝐷)𝑅) → (𝑥(ball‘𝐷)𝑅) ∈ 𝐹))))
35	27, 28, 32, 34	syl3c 66	. . . . . 6 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) ∧ 𝑥 ∈ 𝑋) → (𝑠 ⊆ (𝑥(ball‘𝐷)𝑅) → (𝑥(ball‘𝐷)𝑅) ∈ 𝐹))
36	26, 35	sylbird 260	. . . . 5 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) ∧ 𝑥 ∈ 𝑋) → (∀𝑦 ∈ 𝑠 (𝑥𝐷𝑦) < 𝑅 → (𝑥(ball‘𝐷)𝑅) ∈ 𝐹))
37	36	reximdva 3165	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) → (∃𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑠 (𝑥𝐷𝑦) < 𝑅 → ∃𝑥 ∈ 𝑋 (𝑥(ball‘𝐷)𝑅) ∈ 𝐹))
38	9, 13, 37	3syld 60	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) ∧ 𝑠 ∈ 𝐹) → (∀𝑥 ∈ 𝑠 ∀𝑦 ∈ 𝑠 (𝑥𝐷𝑦) < 𝑅 → ∃𝑥 ∈ 𝑋 (𝑥(ball‘𝐷)𝑅) ∈ 𝐹))
39	38	rexlimdva 3152	. 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) → (∃𝑠 ∈ 𝐹 ∀𝑥 ∈ 𝑠 ∀𝑦 ∈ 𝑠 (𝑥𝐷𝑦) < 𝑅 → ∃𝑥 ∈ 𝑋 (𝑥(ball‘𝐷)𝑅) ∈ 𝐹))
40	2, 39	mpd 15	1 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ 𝑅 ∈ ℝ⁺) → ∃𝑥 ∈ 𝑋 (𝑥(ball‘𝐷)𝑅) ∈ 𝐹)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1085 ∈ wcel 2099 ≠ wne 2937 ∀wral 3058 ∃wrex 3067 ⊆ wss 3947 ∅c0 4323 class class class wbr 5148 ‘cfv 6548 (class class class)co 7420 ℝ^*cxr 11278 < clt 11279 ℝ⁺crp 13007 ∞Metcxmet 21264 ballcbl 21266 Filcfil 23762 CauFilccfil 25193

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-sep 5299 ax-nul 5306 ax-pow 5365 ax-pr 5429 ax-un 7740 ax-cnex 11195 ax-resscn 11196 ax-1cn 11197 ax-icn 11198 ax-addcl 11199 ax-addrcl 11200 ax-mulcl 11201 ax-mulrcl 11202 ax-mulcom 11203 ax-addass 11204 ax-mulass 11205 ax-distr 11206 ax-i2m1 11207 ax-1ne0 11208 ax-1rid 11209 ax-rnegex 11210 ax-rrecex 11211 ax-cnre 11212 ax-pre-lttri 11213 ax-pre-lttrn 11214 ax-pre-ltadd 11215 ax-pre-mulgt0 11216

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3373 df-reu 3374 df-rab 3430 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4909 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-id 5576 df-po 5590 df-so 5591 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-rn 5689 df-res 5690 df-ima 5691 df-iota 6500 df-fun 6550 df-fn 6551 df-f 6552 df-f1 6553 df-fo 6554 df-f1o 6555 df-fv 6556 df-riota 7376 df-ov 7423 df-oprab 7424 df-mpo 7425 df-1st 7993 df-2nd 7994 df-er 8725 df-map 8847 df-en 8965 df-dom 8966 df-sdom 8967 df-pnf 11281 df-mnf 11282 df-xr 11283 df-ltxr 11284 df-le 11285 df-sub 11477 df-neg 11478 df-div 11903 df-2 12306 df-rp 13008 df-xneg 13125 df-xadd 13126 df-xmul 13127 df-ico 13363 df-psmet 21271 df-xmet 21272 df-bl 21274 df-fbas 21276 df-fil 23763 df-cfil 25196

This theorem is referenced by: iscfil3 25214 cfilfcls 25215 relcmpcmet 25259

W3C validator