iscfil2 - Metamath Proof Explorer

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Theorem iscfil2 25145

Description: The property of being a Cauchy filter. (Contributed by Mario Carneiro, 13-Oct-2015.)

**Assertion**
Ref	Expression
iscfil2	⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝐹 ∈ (CauFil‘𝐷) ↔ (𝐹 ∈ (Fil‘𝑋) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ 𝐹 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥)))

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

**Proof of Theorem iscfil2**
Step	Hyp	Ref	Expression
1		iscfil 25144	. 2 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝐹 ∈ (CauFil‘𝐷) ↔ (𝐹 ∈ (Fil‘𝑋) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ 𝐹 (𝐷 “ (𝑦 × 𝑦)) ⊆ (0[,)𝑥))))
2		xmetf 24186	. . . . . . . . 9 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝐷:(𝑋 × 𝑋)⟶ℝ^*)
3	2	ad3antrrr 727	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → 𝐷:(𝑋 × 𝑋)⟶ℝ^*)
4	3	ffund 6714	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → Fun 𝐷)
5		filelss 23707	. . . . . . . . . 10 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑦 ∈ 𝐹) → 𝑦 ⊆ 𝑋)
6	5	ad4ant24 751	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → 𝑦 ⊆ 𝑋)
7		xpss12 5684	. . . . . . . . 9 ⊢ ((𝑦 ⊆ 𝑋 ∧ 𝑦 ⊆ 𝑋) → (𝑦 × 𝑦) ⊆ (𝑋 × 𝑋))
8	6, 6, 7	syl2anc 583	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → (𝑦 × 𝑦) ⊆ (𝑋 × 𝑋))
9	3	fdmd 6721	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → dom 𝐷 = (𝑋 × 𝑋))
10	8, 9	sseqtrrd 4018	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → (𝑦 × 𝑦) ⊆ dom 𝐷)
11		funimassov 7580	. . . . . . 7 ⊢ ((Fun 𝐷 ∧ (𝑦 × 𝑦) ⊆ dom 𝐷) → ((𝐷 “ (𝑦 × 𝑦)) ⊆ (0[,)𝑥) ↔ ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) ∈ (0[,)𝑥)))
12	4, 10, 11	syl2anc 583	. . . . . 6 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → ((𝐷 “ (𝑦 × 𝑦)) ⊆ (0[,)𝑥) ↔ ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) ∈ (0[,)𝑥)))
13		0xr 11262	. . . . . . . . 9 ⊢ 0 ∈ ℝ^*
14	13	a1i 11	. . . . . . . 8 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ (𝑧 ∈ 𝑦 ∧ 𝑤 ∈ 𝑦)) → 0 ∈ ℝ^*)
15		simpllr 773	. . . . . . . . 9 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ (𝑧 ∈ 𝑦 ∧ 𝑤 ∈ 𝑦)) → 𝑥 ∈ ℝ⁺)
16	15	rpxrd 13020	. . . . . . . 8 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ (𝑧 ∈ 𝑦 ∧ 𝑤 ∈ 𝑦)) → 𝑥 ∈ ℝ^*)
17		simp-4l 780	. . . . . . . . 9 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ (𝑧 ∈ 𝑦 ∧ 𝑤 ∈ 𝑦)) → 𝐷 ∈ (∞Met‘𝑋))
18	6	sselda 3977	. . . . . . . . . 10 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ 𝑧 ∈ 𝑦) → 𝑧 ∈ 𝑋)
19	18	adantrr 714	. . . . . . . . 9 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ (𝑧 ∈ 𝑦 ∧ 𝑤 ∈ 𝑦)) → 𝑧 ∈ 𝑋)
20	6	sselda 3977	. . . . . . . . . 10 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ 𝑤 ∈ 𝑦) → 𝑤 ∈ 𝑋)
21	20	adantrl 713	. . . . . . . . 9 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ (𝑧 ∈ 𝑦 ∧ 𝑤 ∈ 𝑦)) → 𝑤 ∈ 𝑋)
22		xmetcl 24188	. . . . . . . . 9 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑧 ∈ 𝑋 ∧ 𝑤 ∈ 𝑋) → (𝑧𝐷𝑤) ∈ ℝ^*)
23	17, 19, 21, 22	syl3anc 1368	. . . . . . . 8 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ (𝑧 ∈ 𝑦 ∧ 𝑤 ∈ 𝑦)) → (𝑧𝐷𝑤) ∈ ℝ^*)
24		xmetge0 24201	. . . . . . . . 9 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑧 ∈ 𝑋 ∧ 𝑤 ∈ 𝑋) → 0 ≤ (𝑧𝐷𝑤))
25	17, 19, 21, 24	syl3anc 1368	. . . . . . . 8 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ (𝑧 ∈ 𝑦 ∧ 𝑤 ∈ 𝑦)) → 0 ≤ (𝑧𝐷𝑤))
26		elico1 13370	. . . . . . . . . 10 ⊢ ((0 ∈ ℝ^* ∧ 𝑥 ∈ ℝ^) → ((𝑧𝐷𝑤) ∈ (0[,)𝑥) ↔ ((𝑧𝐷𝑤) ∈ ℝ^ ∧ 0 ≤ (𝑧𝐷𝑤) ∧ (𝑧𝐷𝑤) < 𝑥)))
27		df-3an 1086	. . . . . . . . . 10 ⊢ (((𝑧𝐷𝑤) ∈ ℝ^* ∧ 0 ≤ (𝑧𝐷𝑤) ∧ (𝑧𝐷𝑤) < 𝑥) ↔ (((𝑧𝐷𝑤) ∈ ℝ^* ∧ 0 ≤ (𝑧𝐷𝑤)) ∧ (𝑧𝐷𝑤) < 𝑥))
28	26, 27	bitrdi 287	. . . . . . . . 9 ⊢ ((0 ∈ ℝ^* ∧ 𝑥 ∈ ℝ^) → ((𝑧𝐷𝑤) ∈ (0[,)𝑥) ↔ (((𝑧𝐷𝑤) ∈ ℝ^ ∧ 0 ≤ (𝑧𝐷𝑤)) ∧ (𝑧𝐷𝑤) < 𝑥)))
29	28	baibd 539	. . . . . . . 8 ⊢ (((0 ∈ ℝ^* ∧ 𝑥 ∈ ℝ^) ∧ ((𝑧𝐷𝑤) ∈ ℝ^ ∧ 0 ≤ (𝑧𝐷𝑤))) → ((𝑧𝐷𝑤) ∈ (0[,)𝑥) ↔ (𝑧𝐷𝑤) < 𝑥))
30	14, 16, 23, 25, 29	syl22anc 836	. . . . . . 7 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ (𝑧 ∈ 𝑦 ∧ 𝑤 ∈ 𝑦)) → ((𝑧𝐷𝑤) ∈ (0[,)𝑥) ↔ (𝑧𝐷𝑤) < 𝑥))
31	30	2ralbidva 3210	. . . . . 6 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → (∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) ∈ (0[,)𝑥) ↔ ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥))
32	12, 31	bitrd 279	. . . . 5 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → ((𝐷 “ (𝑦 × 𝑦)) ⊆ (0[,)𝑥) ↔ ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥))
33	32	rexbidva 3170	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) → (∃𝑦 ∈ 𝐹 (𝐷 “ (𝑦 × 𝑦)) ⊆ (0[,)𝑥) ↔ ∃𝑦 ∈ 𝐹 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥))
34	33	ralbidva 3169	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) → (∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ 𝐹 (𝐷 “ (𝑦 × 𝑦)) ⊆ (0[,)𝑥) ↔ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ 𝐹 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥))
35	34	pm5.32da 578	. 2 ⊢ (𝐷 ∈ (∞Met‘𝑋) → ((𝐹 ∈ (Fil‘𝑋) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ 𝐹 (𝐷 “ (𝑦 × 𝑦)) ⊆ (0[,)𝑥)) ↔ (𝐹 ∈ (Fil‘𝑋) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ 𝐹 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥)))
36	1, 35	bitrd 279	1 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝐹 ∈ (CauFil‘𝐷) ↔ (𝐹 ∈ (Fil‘𝑋) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ 𝐹 ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) < 𝑥)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1084 ∈ wcel 2098 ∀wral 3055 ∃wrex 3064 ⊆ wss 3943 class class class wbr 5141 × cxp 5667 dom cdm 5669 “ cima 5672 Fun wfun 6530 ⟶wf 6532 ‘cfv 6536 (class class class)co 7404 0cc0 11109 ℝ^*cxr 11248 < clt 11249 ≤ cle 11250 ℝ⁺crp 12977 [,)cico 13329 ∞Metcxmet 21221 Filcfil 23700 CauFilccfil 25131

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2697 ax-sep 5292 ax-nul 5299 ax-pow 5356 ax-pr 5420 ax-un 7721 ax-cnex 11165 ax-resscn 11166 ax-1cn 11167 ax-icn 11168 ax-addcl 11169 ax-addrcl 11170 ax-mulcl 11171 ax-mulrcl 11172 ax-mulcom 11173 ax-addass 11174 ax-mulass 11175 ax-distr 11176 ax-i2m1 11177 ax-1ne0 11178 ax-1rid 11179 ax-rnegex 11180 ax-rrecex 11181 ax-cnre 11182 ax-pre-lttri 11183 ax-pre-lttrn 11184 ax-pre-ltadd 11185 ax-pre-mulgt0 11186

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2704 df-cleq 2718 df-clel 2804 df-nfc 2879 df-ne 2935 df-nel 3041 df-ral 3056 df-rex 3065 df-rmo 3370 df-reu 3371 df-rab 3427 df-v 3470 df-sbc 3773 df-csb 3889 df-dif 3946 df-un 3948 df-in 3950 df-ss 3960 df-nul 4318 df-if 4524 df-pw 4599 df-sn 4624 df-pr 4626 df-op 4630 df-uni 4903 df-iun 4992 df-br 5142 df-opab 5204 df-mpt 5225 df-id 5567 df-po 5581 df-so 5582 df-xp 5675 df-rel 5676 df-cnv 5677 df-co 5678 df-dm 5679 df-rn 5680 df-res 5681 df-ima 5682 df-iota 6488 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-riota 7360 df-ov 7407 df-oprab 7408 df-mpo 7409 df-1st 7971 df-2nd 7972 df-er 8702 df-map 8821 df-en 8939 df-dom 8940 df-sdom 8941 df-pnf 11251 df-mnf 11252 df-xr 11253 df-ltxr 11254 df-le 11255 df-sub 11447 df-neg 11448 df-div 11873 df-2 12276 df-rp 12978 df-xneg 13095 df-xadd 13096 df-xmul 13097 df-ico 13333 df-xmet 21229 df-fbas 21233 df-fil 23701 df-cfil 25134

This theorem is referenced by: cfili 25147 fgcfil 25150 iscfil3 25152 cfilresi 25174 cfilres 25175

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