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Theorem fgcfil 25021

Description: The Cauchy filter condition for a filter base. (Contributed by Mario Carneiro, 13-Oct-2015.)

**Assertion**
Ref	Expression
fgcfil	⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐵 ∈ (fBas‘𝑋)) → ((𝑋filGen𝐵) ∈ (CauFil‘𝐷) ↔ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥))

Distinct variable groups: 𝑥,𝑤,𝑦,𝑧,𝐵 𝑤,𝑋,𝑥,𝑦,𝑧 𝑤,𝐷,𝑥,𝑦,𝑧

Proof of Theorem fgcfil Dummy variable 𝑢 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		cfili 25018	. . . . . 6 ⊢ (((𝑋filGen𝐵) ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ ℝ⁺) → ∃𝑢 ∈ (𝑋filGen𝐵)∀𝑧 ∈ 𝑢 ∀𝑤 ∈ 𝑢 (𝑧𝐷𝑤) < 𝑥)
2	1	adantll 710	. . . . 5 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐵 ∈ (fBas‘𝑋)) ∧ (𝑋filGen𝐵) ∈ (CauFil‘𝐷)) ∧ 𝑥 ∈ ℝ⁺) → ∃𝑢 ∈ (𝑋filGen𝐵)∀𝑧 ∈ 𝑢 ∀𝑤 ∈ 𝑢 (𝑧𝐷𝑤) < 𝑥)
3		elfg 23597	. . . . . . . 8 ⊢ (𝐵 ∈ (fBas‘𝑋) → (𝑢 ∈ (𝑋filGen𝐵) ↔ (𝑢 ⊆ 𝑋 ∧ ∃𝑦 ∈ 𝐵 𝑦 ⊆ 𝑢)))
4	3	ad3antlr 727	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐵 ∈ (fBas‘𝑋)) ∧ (𝑋filGen𝐵) ∈ (CauFil‘𝐷)) ∧ 𝑥 ∈ ℝ⁺) → (𝑢 ∈ (𝑋filGen𝐵) ↔ (𝑢 ⊆ 𝑋 ∧ ∃𝑦 ∈ 𝐵 𝑦 ⊆ 𝑢)))
5		ssralv 4051	. . . . . . . . . . . 12 ⊢ (𝑦 ⊆ 𝑢 → (∀𝑤 ∈ 𝑢 (𝑧𝐷𝑤) < 𝑥 → ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥))
6	5	ralimdv 3167	. . . . . . . . . . 11 ⊢ (𝑦 ⊆ 𝑢 → (∀𝑧 ∈ 𝑢 ∀𝑤 ∈ 𝑢 (𝑧𝐷𝑤) < 𝑥 → ∀𝑧 ∈ 𝑢 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥))
7		ssralv 4051	. . . . . . . . . . 11 ⊢ (𝑦 ⊆ 𝑢 → (∀𝑧 ∈ 𝑢 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥 → ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥))
8	6, 7	syldc 48	. . . . . . . . . 10 ⊢ (∀𝑧 ∈ 𝑢 ∀𝑤 ∈ 𝑢 (𝑧𝐷𝑤) < 𝑥 → (𝑦 ⊆ 𝑢 → ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥))
9	8	reximdv 3168	. . . . . . . . 9 ⊢ (∀𝑧 ∈ 𝑢 ∀𝑤 ∈ 𝑢 (𝑧𝐷𝑤) < 𝑥 → (∃𝑦 ∈ 𝐵 𝑦 ⊆ 𝑢 → ∃𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥))
10	9	com12 32	. . . . . . . 8 ⊢ (∃𝑦 ∈ 𝐵 𝑦 ⊆ 𝑢 → (∀𝑧 ∈ 𝑢 ∀𝑤 ∈ 𝑢 (𝑧𝐷𝑤) < 𝑥 → ∃𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥))
11	10	adantl 480	. . . . . . 7 ⊢ ((𝑢 ⊆ 𝑋 ∧ ∃𝑦 ∈ 𝐵 𝑦 ⊆ 𝑢) → (∀𝑧 ∈ 𝑢 ∀𝑤 ∈ 𝑢 (𝑧𝐷𝑤) < 𝑥 → ∃𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥))
12	4, 11	syl6bi 252	. . . . . 6 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐵 ∈ (fBas‘𝑋)) ∧ (𝑋filGen𝐵) ∈ (CauFil‘𝐷)) ∧ 𝑥 ∈ ℝ⁺) → (𝑢 ∈ (𝑋filGen𝐵) → (∀𝑧 ∈ 𝑢 ∀𝑤 ∈ 𝑢 (𝑧𝐷𝑤) < 𝑥 → ∃𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥)))
13	12	rexlimdv 3151	. . . . 5 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐵 ∈ (fBas‘𝑋)) ∧ (𝑋filGen𝐵) ∈ (CauFil‘𝐷)) ∧ 𝑥 ∈ ℝ⁺) → (∃𝑢 ∈ (𝑋filGen𝐵)∀𝑧 ∈ 𝑢 ∀𝑤 ∈ 𝑢 (𝑧𝐷𝑤) < 𝑥 → ∃𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥))
14	2, 13	mpd 15	. . . 4 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐵 ∈ (fBas‘𝑋)) ∧ (𝑋filGen𝐵) ∈ (CauFil‘𝐷)) ∧ 𝑥 ∈ ℝ⁺) → ∃𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥)
15	14	ralrimiva 3144	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐵 ∈ (fBas‘𝑋)) ∧ (𝑋filGen𝐵) ∈ (CauFil‘𝐷)) → ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥)
16	15	ex 411	. 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐵 ∈ (fBas‘𝑋)) → ((𝑋filGen𝐵) ∈ (CauFil‘𝐷) → ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥))
17		ssfg 23598	. . . . . 6 ⊢ (𝐵 ∈ (fBas‘𝑋) → 𝐵 ⊆ (𝑋filGen𝐵))
18	17	adantl 480	. . . . 5 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐵 ∈ (fBas‘𝑋)) → 𝐵 ⊆ (𝑋filGen𝐵))
19		ssrexv 4052	. . . . . 6 ⊢ (𝐵 ⊆ (𝑋filGen𝐵) → (∃𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥 → ∃𝑦 ∈ (𝑋filGen𝐵)∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥))
20	19	ralimdv 3167	. . . . 5 ⊢ (𝐵 ⊆ (𝑋filGen𝐵) → (∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥 → ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ (𝑋filGen𝐵)∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥))
21	18, 20	syl 17	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐵 ∈ (fBas‘𝑋)) → (∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥 → ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ (𝑋filGen𝐵)∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥))
22		fgcl 23604	. . . . 5 ⊢ (𝐵 ∈ (fBas‘𝑋) → (𝑋filGen𝐵) ∈ (Fil‘𝑋))
23	22	adantl 480	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐵 ∈ (fBas‘𝑋)) → (𝑋filGen𝐵) ∈ (Fil‘𝑋))
24	21, 23	jctild 524	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐵 ∈ (fBas‘𝑋)) → (∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥 → ((𝑋filGen𝐵) ∈ (Fil‘𝑋) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ (𝑋filGen𝐵)∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥)))
25		iscfil2 25016	. . . 4 ⊢ (𝐷 ∈ (∞Met‘𝑋) → ((𝑋filGen𝐵) ∈ (CauFil‘𝐷) ↔ ((𝑋filGen𝐵) ∈ (Fil‘𝑋) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ (𝑋filGen𝐵)∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥)))
26	25	adantr 479	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐵 ∈ (fBas‘𝑋)) → ((𝑋filGen𝐵) ∈ (CauFil‘𝐷) ↔ ((𝑋filGen𝐵) ∈ (Fil‘𝑋) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ (𝑋filGen𝐵)∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥)))
27	24, 26	sylibrd 258	. 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐵 ∈ (fBas‘𝑋)) → (∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥 → (𝑋filGen𝐵) ∈ (CauFil‘𝐷)))
28	16, 27	impbid 211	1 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐵 ∈ (fBas‘𝑋)) → ((𝑋filGen𝐵) ∈ (CauFil‘𝐷) ↔ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 394 ∈ wcel 2104 ∀wral 3059 ∃wrex 3068 ⊆ wss 3949 class class class wbr 5149 ‘cfv 6544 (class class class)co 7413 < clt 11254 ℝ⁺crp 12980 ∞Metcxmet 21131 fBascfbas 21134 filGencfg 21135 Filcfil 23571 CauFilccfil 25002

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 1911 ax-6 1969 ax-7 2009 ax-8 2106 ax-9 2114 ax-10 2135 ax-11 2152 ax-12 2169 ax-ext 2701 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7729 ax-cnex 11170 ax-resscn 11171 ax-1cn 11172 ax-icn 11173 ax-addcl 11174 ax-addrcl 11175 ax-mulcl 11176 ax-mulrcl 11177 ax-mulcom 11178 ax-addass 11179 ax-mulass 11180 ax-distr 11181 ax-i2m1 11182 ax-1ne0 11183 ax-1rid 11184 ax-rnegex 11185 ax-rrecex 11186 ax-cnre 11187 ax-pre-lttri 11188 ax-pre-lttrn 11189 ax-pre-ltadd 11190 ax-pre-mulgt0 11191

This theorem depends on definitions: df-bi 206 df-an 395 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2532 df-eu 2561 df-clab 2708 df-cleq 2722 df-clel 2808 df-nfc 2883 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-rmo 3374 df-reu 3375 df-rab 3431 df-v 3474 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-id 5575 df-po 5589 df-so 5590 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-riota 7369 df-ov 7416 df-oprab 7417 df-mpo 7418 df-1st 7979 df-2nd 7980 df-er 8707 df-map 8826 df-en 8944 df-dom 8945 df-sdom 8946 df-pnf 11256 df-mnf 11257 df-xr 11258 df-ltxr 11259 df-le 11260 df-sub 11452 df-neg 11453 df-div 11878 df-2 12281 df-rp 12981 df-xneg 13098 df-xadd 13099 df-xmul 13100 df-ico 13336 df-xmet 21139 df-fbas 21143 df-fg 21144 df-fil 23572 df-cfil 25005

This theorem is referenced by: fmcfil 25022 cfilresi 25045 minveclem3 25179

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