iscfil2 - Metamath Proof Explorer

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Theorem iscfil2 24782

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 24781	. 2 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝐹 ∈ (CauFil‘𝐷) ↔ (𝐹 ∈ (Fil‘𝑋) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ 𝐹 (𝐷 “ (𝑦 × 𝑦)) ⊆ (0[,)𝑥))))
2		xmetf 23834	. . . . . . . . 9 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝐷:(𝑋 × 𝑋)⟶ℝ^*)
3	2	ad3antrrr 728	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → 𝐷:(𝑋 × 𝑋)⟶ℝ^*)
4	3	ffund 6721	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → Fun 𝐷)
5		filelss 23355	. . . . . . . . . 10 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑦 ∈ 𝐹) → 𝑦 ⊆ 𝑋)
6	5	ad4ant24 752	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → 𝑦 ⊆ 𝑋)
7		xpss12 5691	. . . . . . . . 9 ⊢ ((𝑦 ⊆ 𝑋 ∧ 𝑦 ⊆ 𝑋) → (𝑦 × 𝑦) ⊆ (𝑋 × 𝑋))
8	6, 6, 7	syl2anc 584	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → (𝑦 × 𝑦) ⊆ (𝑋 × 𝑋))
9	3	fdmd 6728	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → dom 𝐷 = (𝑋 × 𝑋))
10	8, 9	sseqtrrd 4023	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → (𝑦 × 𝑦) ⊆ dom 𝐷)
11		funimassov 7583	. . . . . . 7 ⊢ ((Fun 𝐷 ∧ (𝑦 × 𝑦) ⊆ dom 𝐷) → ((𝐷 “ (𝑦 × 𝑦)) ⊆ (0[,)𝑥) ↔ ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) ∈ (0[,)𝑥)))
12	4, 10, 11	syl2anc 584	. . . . . 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 11260	. . . . . . . . 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 774	. . . . . . . . 9 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ (𝑧 ∈ 𝑦 ∧ 𝑤 ∈ 𝑦)) → 𝑥 ∈ ℝ⁺)
16	15	rpxrd 13016	. . . . . . . 8 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ (𝑧 ∈ 𝑦 ∧ 𝑤 ∈ 𝑦)) → 𝑥 ∈ ℝ^*)
17		simp-4l 781	. . . . . . . . 9 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ (𝑧 ∈ 𝑦 ∧ 𝑤 ∈ 𝑦)) → 𝐷 ∈ (∞Met‘𝑋))
18	6	sselda 3982	. . . . . . . . . 10 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ 𝑧 ∈ 𝑦) → 𝑧 ∈ 𝑋)
19	18	adantrr 715	. . . . . . . . 9 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ (𝑧 ∈ 𝑦 ∧ 𝑤 ∈ 𝑦)) → 𝑧 ∈ 𝑋)
20	6	sselda 3982	. . . . . . . . . 10 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ 𝑤 ∈ 𝑦) → 𝑤 ∈ 𝑋)
21	20	adantrl 714	. . . . . . . . 9 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ (𝑧 ∈ 𝑦 ∧ 𝑤 ∈ 𝑦)) → 𝑤 ∈ 𝑋)
22		xmetcl 23836	. . . . . . . . 9 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑧 ∈ 𝑋 ∧ 𝑤 ∈ 𝑋) → (𝑧𝐷𝑤) ∈ ℝ^*)
23	17, 19, 21, 22	syl3anc 1371	. . . . . . . 8 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ (𝑧 ∈ 𝑦 ∧ 𝑤 ∈ 𝑦)) → (𝑧𝐷𝑤) ∈ ℝ^*)
24		xmetge0 23849	. . . . . . . . 9 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑧 ∈ 𝑋 ∧ 𝑤 ∈ 𝑋) → 0 ≤ (𝑧𝐷𝑤))
25	17, 19, 21, 24	syl3anc 1371	. . . . . . . 8 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ (𝑧 ∈ 𝑦 ∧ 𝑤 ∈ 𝑦)) → 0 ≤ (𝑧𝐷𝑤))
26		elico1 13366	. . . . . . . . . 10 ⊢ ((0 ∈ ℝ^* ∧ 𝑥 ∈ ℝ^) → ((𝑧𝐷𝑤) ∈ (0[,)𝑥) ↔ ((𝑧𝐷𝑤) ∈ ℝ^ ∧ 0 ≤ (𝑧𝐷𝑤) ∧ (𝑧𝐷𝑤) < 𝑥)))
27		df-3an 1089	. . . . . . . . . 10 ⊢ (((𝑧𝐷𝑤) ∈ ℝ^* ∧ 0 ≤ (𝑧𝐷𝑤) ∧ (𝑧𝐷𝑤) < 𝑥) ↔ (((𝑧𝐷𝑤) ∈ ℝ^* ∧ 0 ≤ (𝑧𝐷𝑤)) ∧ (𝑧𝐷𝑤) < 𝑥))
28	26, 27	bitrdi 286	. . . . . . . . 9 ⊢ ((0 ∈ ℝ^* ∧ 𝑥 ∈ ℝ^) → ((𝑧𝐷𝑤) ∈ (0[,)𝑥) ↔ (((𝑧𝐷𝑤) ∈ ℝ^ ∧ 0 ≤ (𝑧𝐷𝑤)) ∧ (𝑧𝐷𝑤) < 𝑥)))
29	28	baibd 540	. . . . . . . 8 ⊢ (((0 ∈ ℝ^* ∧ 𝑥 ∈ ℝ^) ∧ ((𝑧𝐷𝑤) ∈ ℝ^ ∧ 0 ≤ (𝑧𝐷𝑤))) → ((𝑧𝐷𝑤) ∈ (0[,)𝑥) ↔ (𝑧𝐷𝑤) < 𝑥))
30	14, 16, 23, 25, 29	syl22anc 837	. . . . . . 7 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) ∧ (𝑧 ∈ 𝑦 ∧ 𝑤 ∈ 𝑦)) → ((𝑧𝐷𝑤) ∈ (0[,)𝑥) ↔ (𝑧𝐷𝑤) < 𝑥))
31	30	2ralbidva 3216	. . . . . 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 278	. . . . 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 3176	. . . 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 3175	. . 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 579	. 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 278	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 396 ∧ w3a 1087 ∈ wcel 2106 ∀wral 3061 ∃wrex 3070 ⊆ wss 3948 class class class wbr 5148 × cxp 5674 dom cdm 5676 “ cima 5679 Fun wfun 6537 ⟶wf 6539 ‘cfv 6543 (class class class)co 7408 0cc0 11109 ℝ^*cxr 11246 < clt 11247 ≤ cle 11248 ℝ⁺crp 12973 [,)cico 13325 ∞Metcxmet 20928 Filcfil 23348 CauFilccfil 24768

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7724 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 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-id 5574 df-po 5588 df-so 5589 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-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7364 df-ov 7411 df-oprab 7412 df-mpo 7413 df-1st 7974 df-2nd 7975 df-er 8702 df-map 8821 df-en 8939 df-dom 8940 df-sdom 8941 df-pnf 11249 df-mnf 11250 df-xr 11251 df-ltxr 11252 df-le 11253 df-sub 11445 df-neg 11446 df-div 11871 df-2 12274 df-rp 12974 df-xneg 13091 df-xadd 13092 df-xmul 13093 df-ico 13329 df-xmet 20936 df-fbas 20940 df-fil 23349 df-cfil 24771

This theorem is referenced by: cfili 24784 fgcfil 24787 iscfil3 24789 cfilresi 24811 cfilres 24812

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