iscfil2 - Metamath Proof Explorer

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Theorem iscfil2 25212

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 25211	. 2 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝐹 ∈ (CauFil‘𝐷) ↔ (𝐹 ∈ (Fil‘𝑋) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ 𝐹 (𝐷 “ (𝑦 × 𝑦)) ⊆ (0[,)𝑥))))
2		xmetf 24253	. . . . . . . . 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 6729	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → Fun 𝐷)
5		filelss 23774	. . . . . . . . . 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 5695	. . . . . . . . 9 ⊢ ((𝑦 ⊆ 𝑋 ∧ 𝑦 ⊆ 𝑋) → (𝑦 × 𝑦) ⊆ (𝑋 × 𝑋))
8	6, 6, 7	syl2anc 582	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → (𝑦 × 𝑦) ⊆ (𝑋 × 𝑋))
9	3	fdmd 6736	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → dom 𝐷 = (𝑋 × 𝑋))
10	8, 9	sseqtrrd 4021	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑦 ∈ 𝐹) → (𝑦 × 𝑦) ⊆ dom 𝐷)
11		funimassov 7602	. . . . . . 7 ⊢ ((Fun 𝐷 ∧ (𝑦 × 𝑦) ⊆ dom 𝐷) → ((𝐷 “ (𝑦 × 𝑦)) ⊆ (0[,)𝑥) ↔ ∀𝑧 ∈ 𝑦 ∀𝑤 ∈ 𝑦 (𝑧𝐷𝑤) ∈ (0[,)𝑥)))
12	4, 10, 11	syl2anc 582	. . . . . 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 11297	. . . . . . . . 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 13055	. . . . . . . 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 3980	. . . . . . . . . 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 3980	. . . . . . . . . 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 24255	. . . . . . . . 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 24268	. . . . . . . . 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 13405	. . . . . . . . . 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 286	. . . . . . . . 9 ⊢ ((0 ∈ ℝ^* ∧ 𝑥 ∈ ℝ^) → ((𝑧𝐷𝑤) ∈ (0[,)𝑥) ↔ (((𝑧𝐷𝑤) ∈ ℝ^ ∧ 0 ≤ (𝑧𝐷𝑤)) ∧ (𝑧𝐷𝑤) < 𝑥)))
29	28	baibd 538	. . . . . . . 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 3212	. . . . . 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 3172	. . . 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 3171	. . 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 577	. 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 394 ∧ w3a 1084 ∈ wcel 2098 ∀wral 3057 ∃wrex 3066 ⊆ wss 3947 class class class wbr 5150 × cxp 5678 dom cdm 5680 “ cima 5683 Fun wfun 6545 ⟶wf 6547 ‘cfv 6551 (class class class)co 7424 0cc0 11144 ℝ^*cxr 11283 < clt 11284 ≤ cle 11285 ℝ⁺crp 13012 [,)cico 13364 ∞Metcxmet 21269 Filcfil 23767 CauFilccfil 25198

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 2166 ax-ext 2698 ax-sep 5301 ax-nul 5308 ax-pow 5367 ax-pr 5431 ax-un 7744 ax-cnex 11200 ax-resscn 11201 ax-1cn 11202 ax-icn 11203 ax-addcl 11204 ax-addrcl 11205 ax-mulcl 11206 ax-mulrcl 11207 ax-mulcom 11208 ax-addass 11209 ax-mulass 11210 ax-distr 11211 ax-i2m1 11212 ax-1ne0 11213 ax-1rid 11214 ax-rnegex 11215 ax-rrecex 11216 ax-cnre 11217 ax-pre-lttri 11218 ax-pre-lttrn 11219 ax-pre-ltadd 11220 ax-pre-mulgt0 11221

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2529 df-eu 2558 df-clab 2705 df-cleq 2719 df-clel 2805 df-nfc 2880 df-ne 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-rmo 3372 df-reu 3373 df-rab 3429 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-nul 4325 df-if 4531 df-pw 4606 df-sn 4631 df-pr 4633 df-op 4637 df-uni 4911 df-iun 5000 df-br 5151 df-opab 5213 df-mpt 5234 df-id 5578 df-po 5592 df-so 5593 df-xp 5686 df-rel 5687 df-cnv 5688 df-co 5689 df-dm 5690 df-rn 5691 df-res 5692 df-ima 5693 df-iota 6503 df-fun 6553 df-fn 6554 df-f 6555 df-f1 6556 df-fo 6557 df-f1o 6558 df-fv 6559 df-riota 7380 df-ov 7427 df-oprab 7428 df-mpo 7429 df-1st 7997 df-2nd 7998 df-er 8729 df-map 8851 df-en 8969 df-dom 8970 df-sdom 8971 df-pnf 11286 df-mnf 11287 df-xr 11288 df-ltxr 11289 df-le 11290 df-sub 11482 df-neg 11483 df-div 11908 df-2 12311 df-rp 13013 df-xneg 13130 df-xadd 13131 df-xmul 13132 df-ico 13368 df-xmet 21277 df-fbas 21281 df-fil 23768 df-cfil 25201

This theorem is referenced by: cfili 25214 fgcfil 25217 iscfil3 25219 cfilresi 25241 cfilres 25242

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