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Theorem cfilfcls 25266

Description: Similar to ultrafilters (uffclsflim 24021), the cluster points and limit points of a Cauchy filter coincide. (Contributed by Mario Carneiro, 15-Oct-2015.)

**Hypotheses**
Ref	Expression
cfilfcls.1	⊢ 𝐽 = (MetOpen‘𝐷)
cfilfcls.2	⊢ 𝑋 = dom dom 𝐷

**Assertion**
Ref	Expression
cfilfcls	⊢ (𝐹 ∈ (CauFil‘𝐷) → (𝐽 fClus 𝐹) = (𝐽 fLim 𝐹))

Proof of Theorem cfilfcls Dummy variables 𝑥 𝑦 𝑧 𝑓 𝑟 𝑑 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqid 2740	. . . . . . . 8 ⊢ ∪ 𝐽 = ∪ 𝐽
2	1	fclselbas 24006	. . . . . . 7 ⊢ (𝑥 ∈ (𝐽 fClus 𝐹) → 𝑥 ∈ ∪ 𝐽)
3	2	adantl 482	. . . . . 6 ⊢ ((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) → 𝑥 ∈ ∪ 𝐽)
4		df-cfil 25247	. . . . . . . . . . . 12 ⊢ CauFil = (𝑑 ∈ ∪ ran ∞Met ↦ {𝑓 ∈ (Fil‘dom dom 𝑑) ∣ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ 𝑓 (𝑑 “ (𝑦 × 𝑦)) ⊆ (0[,)𝑥)})
5	4	mptrcl 6952	. . . . . . . . . . 11 ⊢ (𝐹 ∈ (CauFil‘𝐷) → 𝐷 ∈ ∪ ran ∞Met)
6		xmetunirn 24327	. . . . . . . . . . 11 ⊢ (𝐷 ∈ ∪ ran ∞Met ↔ 𝐷 ∈ (∞Met‘dom dom 𝐷))
7	5, 6	sylib 219	. . . . . . . . . 10 ⊢ (𝐹 ∈ (CauFil‘𝐷) → 𝐷 ∈ (∞Met‘dom dom 𝐷))
8		cfilfcls.2	. . . . . . . . . . 11 ⊢ 𝑋 = dom dom 𝐷
9	8	fveq2i 6837	. . . . . . . . . 10 ⊢ (∞Met‘𝑋) = (∞Met‘dom dom 𝐷)
10	7, 9	eleqtrrdi 2851	. . . . . . . . 9 ⊢ (𝐹 ∈ (CauFil‘𝐷) → 𝐷 ∈ (∞Met‘𝑋))
11	10	adantr 481	. . . . . . . 8 ⊢ ((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) → 𝐷 ∈ (∞Met‘𝑋))
12		cfilfcls.1	. . . . . . . . 9 ⊢ 𝐽 = (MetOpen‘𝐷)
13	12	mopntopon 24429	. . . . . . . 8 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝐽 ∈ (TopOn‘𝑋))
14	11, 13	syl 17	. . . . . . 7 ⊢ ((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) → 𝐽 ∈ (TopOn‘𝑋))
15		toponuni 22904	. . . . . . 7 ⊢ (𝐽 ∈ (TopOn‘𝑋) → 𝑋 = ∪ 𝐽)
16	14, 15	syl 17	. . . . . 6 ⊢ ((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) → 𝑋 = ∪ 𝐽)
17	3, 16	eleqtrrd 2843	. . . . 5 ⊢ ((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) → 𝑥 ∈ 𝑋)
18	12	mopni2 24483	. . . . . . . . . 10 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑦 ∈ 𝐽 ∧ 𝑥 ∈ 𝑦) → ∃𝑟 ∈ ℝ⁺ (𝑥(ball‘𝐷)𝑟) ⊆ 𝑦)
19	18	3expb 1126	. . . . . . . . 9 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑦 ∈ 𝐽 ∧ 𝑥 ∈ 𝑦)) → ∃𝑟 ∈ ℝ⁺ (𝑥(ball‘𝐷)𝑟) ⊆ 𝑦)
20	11, 19	sylan 586	. . . . . . . 8 ⊢ (((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ (𝑦 ∈ 𝐽 ∧ 𝑥 ∈ 𝑦)) → ∃𝑟 ∈ ℝ⁺ (𝑥(ball‘𝐷)𝑟) ⊆ 𝑦)
21		cfilfil 25259	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷)) → 𝐹 ∈ (Fil‘𝑋))
22	10, 21	mpancom 694	. . . . . . . . . . 11 ⊢ (𝐹 ∈ (CauFil‘𝐷) → 𝐹 ∈ (Fil‘𝑋))
23	22	adantr 481	. . . . . . . . . 10 ⊢ ((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) → 𝐹 ∈ (Fil‘𝑋))
24	23	ad2antrr 732	. . . . . . . . 9 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ (𝑦 ∈ 𝐽 ∧ 𝑥 ∈ 𝑦)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝑥(ball‘𝐷)𝑟) ⊆ 𝑦)) → 𝐹 ∈ (Fil‘𝑋))
25	11	adantr 481	. . . . . . . . . . . 12 ⊢ (((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) → 𝐷 ∈ (∞Met‘𝑋))
26		simpll 772	. . . . . . . . . . . 12 ⊢ (((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) → 𝐹 ∈ (CauFil‘𝐷))
27		rphalfcl 12969	. . . . . . . . . . . . . 14 ⊢ (𝑟 ∈ ℝ⁺ → (𝑟 / 2) ∈ ℝ⁺)
28	27	adantl 482	. . . . . . . . . . . . 13 ⊢ (((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) → (𝑟 / 2) ∈ ℝ⁺)
29		rphalfcl 12969	. . . . . . . . . . . . 13 ⊢ ((𝑟 / 2) ∈ ℝ⁺ → ((𝑟 / 2) / 2) ∈ ℝ⁺)
30	28, 29	syl 17	. . . . . . . . . . . 12 ⊢ (((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) → ((𝑟 / 2) / 2) ∈ ℝ⁺)
31		cfil3i 25261	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷) ∧ ((𝑟 / 2) / 2) ∈ ℝ⁺) → ∃𝑦 ∈ 𝑋 (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)
32	25, 26, 30, 31	syl3anc 1379	. . . . . . . . . . 11 ⊢ (((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) → ∃𝑦 ∈ 𝑋 (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)
33	23	ad2antrr 732	. . . . . . . . . . . 12 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → 𝐹 ∈ (Fil‘𝑋))
34		simprr 778	. . . . . . . . . . . 12 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)
35	25	adantr 481	. . . . . . . . . . . . 13 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → 𝐷 ∈ (∞Met‘𝑋))
36	17	ad2antrr 732	. . . . . . . . . . . . 13 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → 𝑥 ∈ 𝑋)
37		rpxr 12950	. . . . . . . . . . . . . 14 ⊢ (𝑟 ∈ ℝ⁺ → 𝑟 ∈ ℝ^*)
38	37	ad2antlr 733	. . . . . . . . . . . . 13 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → 𝑟 ∈ ℝ^*)
39		blssm 24408	. . . . . . . . . . . . 13 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ 𝑋 ∧ 𝑟 ∈ ℝ^*) → (𝑥(ball‘𝐷)𝑟) ⊆ 𝑋)
40	35, 36, 38, 39	syl3anc 1379	. . . . . . . . . . . 12 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → (𝑥(ball‘𝐷)𝑟) ⊆ 𝑋)
41		simpllr 781	. . . . . . . . . . . . . . 15 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → 𝑥 ∈ (𝐽 fClus 𝐹))
42	28	adantr 481	. . . . . . . . . . . . . . . . 17 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → (𝑟 / 2) ∈ ℝ⁺)
43	42	rpxrd 12985	. . . . . . . . . . . . . . . 16 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → (𝑟 / 2) ∈ ℝ^*)
44	12	blopn 24490	. . . . . . . . . . . . . . . 16 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ 𝑋 ∧ (𝑟 / 2) ∈ ℝ^*) → (𝑥(ball‘𝐷)(𝑟 / 2)) ∈ 𝐽)
45	35, 36, 43, 44	syl3anc 1379	. . . . . . . . . . . . . . 15 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → (𝑥(ball‘𝐷)(𝑟 / 2)) ∈ 𝐽)
46		blcntr 24403	. . . . . . . . . . . . . . . 16 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ 𝑋 ∧ (𝑟 / 2) ∈ ℝ⁺) → 𝑥 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)))
47	35, 36, 42, 46	syl3anc 1379	. . . . . . . . . . . . . . 15 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → 𝑥 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)))
48		fclsopni 24005	. . . . . . . . . . . . . . 15 ⊢ ((𝑥 ∈ (𝐽 fClus 𝐹) ∧ ((𝑥(ball‘𝐷)(𝑟 / 2)) ∈ 𝐽 ∧ 𝑥 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → ((𝑥(ball‘𝐷)(𝑟 / 2)) ∩ (𝑦(ball‘𝐷)((𝑟 / 2) / 2))) ≠ ∅)
49	41, 45, 47, 34, 48	syl13anc 1380	. . . . . . . . . . . . . 14 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → ((𝑥(ball‘𝐷)(𝑟 / 2)) ∩ (𝑦(ball‘𝐷)((𝑟 / 2) / 2))) ≠ ∅)
50		n0 4288	. . . . . . . . . . . . . 14 ⊢ (((𝑥(ball‘𝐷)(𝑟 / 2)) ∩ (𝑦(ball‘𝐷)((𝑟 / 2) / 2))) ≠ ∅ ↔ ∃𝑧 𝑧 ∈ ((𝑥(ball‘𝐷)(𝑟 / 2)) ∩ (𝑦(ball‘𝐷)((𝑟 / 2) / 2))))
51	49, 50	sylib 219	. . . . . . . . . . . . 13 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → ∃𝑧 𝑧 ∈ ((𝑥(ball‘𝐷)(𝑟 / 2)) ∩ (𝑦(ball‘𝐷)((𝑟 / 2) / 2))))
52		elin 3906	. . . . . . . . . . . . . . 15 ⊢ (𝑧 ∈ ((𝑥(ball‘𝐷)(𝑟 / 2)) ∩ (𝑦(ball‘𝐷)((𝑟 / 2) / 2))) ↔ (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2))))
53	35	adantr 481	. . . . . . . . . . . . . . . . . 18 ⊢ (((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) ∧ (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)))) → 𝐷 ∈ (∞Met‘𝑋))
54		simplrl 782	. . . . . . . . . . . . . . . . . 18 ⊢ (((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) ∧ (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)))) → 𝑦 ∈ 𝑋)
55	42	adantr 481	. . . . . . . . . . . . . . . . . . 19 ⊢ (((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) ∧ (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)))) → (𝑟 / 2) ∈ ℝ⁺)
56	55	rpred 12984	. . . . . . . . . . . . . . . . . 18 ⊢ (((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) ∧ (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)))) → (𝑟 / 2) ∈ ℝ)
57		simprr 778	. . . . . . . . . . . . . . . . . 18 ⊢ (((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) ∧ (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)))) → 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)))
58		blhalf 24395	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑦 ∈ 𝑋) ∧ ((𝑟 / 2) ∈ ℝ ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)))) → (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ⊆ (𝑧(ball‘𝐷)(𝑟 / 2)))
59	53, 54, 56, 57, 58	syl22anc 844	. . . . . . . . . . . . . . . . 17 ⊢ (((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) ∧ (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)))) → (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ⊆ (𝑧(ball‘𝐷)(𝑟 / 2)))
60		blssm 24408	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ 𝑋 ∧ (𝑟 / 2) ∈ ℝ^*) → (𝑥(ball‘𝐷)(𝑟 / 2)) ⊆ 𝑋)
61	35, 36, 43, 60	syl3anc 1379	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → (𝑥(ball‘𝐷)(𝑟 / 2)) ⊆ 𝑋)
62	61	sselda 3922	. . . . . . . . . . . . . . . . . . 19 ⊢ (((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) ∧ 𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2))) → 𝑧 ∈ 𝑋)
63	62	adantrr 723	. . . . . . . . . . . . . . . . . 18 ⊢ (((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) ∧ (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)))) → 𝑧 ∈ 𝑋)
64		simpllr 781	. . . . . . . . . . . . . . . . . . 19 ⊢ (((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) ∧ (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)))) → 𝑟 ∈ ℝ⁺)
65	64	rpred 12984	. . . . . . . . . . . . . . . . . 18 ⊢ (((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) ∧ (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)))) → 𝑟 ∈ ℝ)
66		simprl 776	. . . . . . . . . . . . . . . . . . 19 ⊢ (((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) ∧ (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)))) → 𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)))
67	55	rpxrd 12985	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) ∧ (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)))) → (𝑟 / 2) ∈ ℝ^*)
68	36	adantr 481	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) ∧ (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)))) → 𝑥 ∈ 𝑋)
69		blcom 24384	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑟 / 2) ∈ ℝ^*) ∧ (𝑥 ∈ 𝑋 ∧ 𝑧 ∈ 𝑋)) → (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ↔ 𝑥 ∈ (𝑧(ball‘𝐷)(𝑟 / 2))))
70	53, 67, 68, 63, 69	syl22anc 844	. . . . . . . . . . . . . . . . . . 19 ⊢ (((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) ∧ (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)))) → (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ↔ 𝑥 ∈ (𝑧(ball‘𝐷)(𝑟 / 2))))
71	66, 70	mpbid 233	. . . . . . . . . . . . . . . . . 18 ⊢ (((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) ∧ (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)))) → 𝑥 ∈ (𝑧(ball‘𝐷)(𝑟 / 2)))
72		blhalf 24395	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑧 ∈ 𝑋) ∧ (𝑟 ∈ ℝ ∧ 𝑥 ∈ (𝑧(ball‘𝐷)(𝑟 / 2)))) → (𝑧(ball‘𝐷)(𝑟 / 2)) ⊆ (𝑥(ball‘𝐷)𝑟))
73	53, 63, 65, 71, 72	syl22anc 844	. . . . . . . . . . . . . . . . 17 ⊢ (((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) ∧ (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)))) → (𝑧(ball‘𝐷)(𝑟 / 2)) ⊆ (𝑥(ball‘𝐷)𝑟))
74	59, 73	sstrd 3932	. . . . . . . . . . . . . . . 16 ⊢ (((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) ∧ (𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)))) → (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ⊆ (𝑥(ball‘𝐷)𝑟))
75	74	ex 413	. . . . . . . . . . . . . . 15 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → ((𝑧 ∈ (𝑥(ball‘𝐷)(𝑟 / 2)) ∧ 𝑧 ∈ (𝑦(ball‘𝐷)((𝑟 / 2) / 2))) → (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ⊆ (𝑥(ball‘𝐷)𝑟)))
76	52, 75	biimtrid 243	. . . . . . . . . . . . . 14 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → (𝑧 ∈ ((𝑥(ball‘𝐷)(𝑟 / 2)) ∩ (𝑦(ball‘𝐷)((𝑟 / 2) / 2))) → (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ⊆ (𝑥(ball‘𝐷)𝑟)))
77	76	exlimdv 1940	. . . . . . . . . . . . 13 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → (∃𝑧 𝑧 ∈ ((𝑥(ball‘𝐷)(𝑟 / 2)) ∩ (𝑦(ball‘𝐷)((𝑟 / 2) / 2))) → (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ⊆ (𝑥(ball‘𝐷)𝑟)))
78	51, 77	mpd 15	. . . . . . . . . . . 12 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ⊆ (𝑥(ball‘𝐷)𝑟))
79		filss 23843	. . . . . . . . . . . 12 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ ((𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹 ∧ (𝑥(ball‘𝐷)𝑟) ⊆ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ⊆ (𝑥(ball‘𝐷)𝑟))) → (𝑥(ball‘𝐷)𝑟) ∈ 𝐹)
80	33, 34, 40, 78, 79	syl13anc 1380	. . . . . . . . . . 11 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) ∧ (𝑦 ∈ 𝑋 ∧ (𝑦(ball‘𝐷)((𝑟 / 2) / 2)) ∈ 𝐹)) → (𝑥(ball‘𝐷)𝑟) ∈ 𝐹)
81	32, 80	rexlimddv 3147	. . . . . . . . . 10 ⊢ (((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑟 ∈ ℝ⁺) → (𝑥(ball‘𝐷)𝑟) ∈ 𝐹)
82	81	ad2ant2r 753	. . . . . . . . 9 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ (𝑦 ∈ 𝐽 ∧ 𝑥 ∈ 𝑦)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝑥(ball‘𝐷)𝑟) ⊆ 𝑦)) → (𝑥(ball‘𝐷)𝑟) ∈ 𝐹)
83		toponss 22917	. . . . . . . . . . . 12 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝑦 ∈ 𝐽) → 𝑦 ⊆ 𝑋)
84	83	adantrr 723	. . . . . . . . . . 11 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ (𝑦 ∈ 𝐽 ∧ 𝑥 ∈ 𝑦)) → 𝑦 ⊆ 𝑋)
85	14, 84	sylan 586	. . . . . . . . . 10 ⊢ (((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ (𝑦 ∈ 𝐽 ∧ 𝑥 ∈ 𝑦)) → 𝑦 ⊆ 𝑋)
86	85	adantr 481	. . . . . . . . 9 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ (𝑦 ∈ 𝐽 ∧ 𝑥 ∈ 𝑦)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝑥(ball‘𝐷)𝑟) ⊆ 𝑦)) → 𝑦 ⊆ 𝑋)
87		simprr 778	. . . . . . . . 9 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ (𝑦 ∈ 𝐽 ∧ 𝑥 ∈ 𝑦)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝑥(ball‘𝐷)𝑟) ⊆ 𝑦)) → (𝑥(ball‘𝐷)𝑟) ⊆ 𝑦)
88		filss 23843	. . . . . . . . 9 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ ((𝑥(ball‘𝐷)𝑟) ∈ 𝐹 ∧ 𝑦 ⊆ 𝑋 ∧ (𝑥(ball‘𝐷)𝑟) ⊆ 𝑦)) → 𝑦 ∈ 𝐹)
89	24, 82, 86, 87, 88	syl13anc 1380	. . . . . . . 8 ⊢ ((((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ (𝑦 ∈ 𝐽 ∧ 𝑥 ∈ 𝑦)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝑥(ball‘𝐷)𝑟) ⊆ 𝑦)) → 𝑦 ∈ 𝐹)
90	20, 89	rexlimddv 3147	. . . . . . 7 ⊢ (((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ (𝑦 ∈ 𝐽 ∧ 𝑥 ∈ 𝑦)) → 𝑦 ∈ 𝐹)
91	90	expr 457	. . . . . 6 ⊢ (((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) ∧ 𝑦 ∈ 𝐽) → (𝑥 ∈ 𝑦 → 𝑦 ∈ 𝐹))
92	91	ralrimiva 3132	. . . . 5 ⊢ ((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) → ∀𝑦 ∈ 𝐽 (𝑥 ∈ 𝑦 → 𝑦 ∈ 𝐹))
93		flimopn 23965	. . . . . 6 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐹 ∈ (Fil‘𝑋)) → (𝑥 ∈ (𝐽 fLim 𝐹) ↔ (𝑥 ∈ 𝑋 ∧ ∀𝑦 ∈ 𝐽 (𝑥 ∈ 𝑦 → 𝑦 ∈ 𝐹))))
94	14, 23, 93	syl2anc 590	. . . . 5 ⊢ ((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) → (𝑥 ∈ (𝐽 fLim 𝐹) ↔ (𝑥 ∈ 𝑋 ∧ ∀𝑦 ∈ 𝐽 (𝑥 ∈ 𝑦 → 𝑦 ∈ 𝐹))))
95	17, 92, 94	mpbir2and 719	. . . 4 ⊢ ((𝐹 ∈ (CauFil‘𝐷) ∧ 𝑥 ∈ (𝐽 fClus 𝐹)) → 𝑥 ∈ (𝐽 fLim 𝐹))
96	95	ex 413	. . 3 ⊢ (𝐹 ∈ (CauFil‘𝐷) → (𝑥 ∈ (𝐽 fClus 𝐹) → 𝑥 ∈ (𝐽 fLim 𝐹)))
97	96	ssrdv 3928	. 2 ⊢ (𝐹 ∈ (CauFil‘𝐷) → (𝐽 fClus 𝐹) ⊆ (𝐽 fLim 𝐹))
98		flimfcls 24016	. . 3 ⊢ (𝐽 fLim 𝐹) ⊆ (𝐽 fClus 𝐹)
99	98	a1i 11	. 2 ⊢ (𝐹 ∈ (CauFil‘𝐷) → (𝐽 fLim 𝐹) ⊆ (𝐽 fClus 𝐹))
100	97, 99	eqssd 3939	1 ⊢ (𝐹 ∈ (CauFil‘𝐷) → (𝐽 fClus 𝐹) = (𝐽 fLim 𝐹))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 207 ∧ wa 396 = wceq 1547 ∃wex 1786 ∈ wcel 2119 ≠ wne 2935 ∀wral 3054 ∃wrex 3064 {crab 3392 ∩ cin 3889 ⊆ wss 3890 ∅c0 4268 ∪ cuni 4845 × cxp 5623 dom cdm 5625 ran crn 5626 “ cima 5628 ‘cfv 6492 (class class class)co 7363 ℝcr 11035 0cc0 11036 ℝ^*cxr 11176 / cdiv 11805 2c2 12234 ℝ⁺crp 12940 [,)cico 13298 ∞Metcxmet 21339 ballcbl 21341 MetOpencmopn 21344 TopOnctopon 22900 Filcfil 23835 fLim cflim 23924 fClus cfcls 23926 CauFilccfil 25244

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2712 ax-rep 5206 ax-sep 5225 ax-nul 5235 ax-pow 5301 ax-pr 5369 ax-un 7685 ax-cnex 11092 ax-resscn 11093 ax-1cn 11094 ax-icn 11095 ax-addcl 11096 ax-addrcl 11097 ax-mulcl 11098 ax-mulrcl 11099 ax-mulcom 11100 ax-addass 11101 ax-mulass 11102 ax-distr 11103 ax-i2m1 11104 ax-1ne0 11105 ax-1rid 11106 ax-rnegex 11107 ax-rrecex 11108 ax-cnre 11109 ax-pre-lttri 11110 ax-pre-lttrn 11111 ax-pre-ltadd 11112 ax-pre-mulgt0 11113 ax-pre-sup 11114

This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3or 1093 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2719 df-cleq 2732 df-clel 2815 df-nfc 2889 df-ne 2936 df-nel 3040 df-ral 3055 df-rex 3065 df-rmo 3345 df-reu 3346 df-rab 3393 df-v 3434 df-sbc 3731 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4269 df-if 4462 df-pw 4538 df-sn 4563 df-pr 4565 df-op 4569 df-uni 4846 df-int 4885 df-iun 4930 df-iin 4931 df-br 5080 df-opab 5142 df-mpt 5161 df-tr 5187 df-id 5520 df-eprel 5525 df-po 5533 df-so 5534 df-fr 5578 df-we 5580 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-ima 5638 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7320 df-ov 7366 df-oprab 7367 df-mpo 7368 df-om 7814 df-1st 7938 df-2nd 7939 df-frecs 8228 df-wrecs 8259 df-recs 8308 df-rdg 8346 df-er 8640 df-map 8772 df-en 8891 df-dom 8892 df-sdom 8893 df-sup 9352 df-inf 9353 df-pnf 11179 df-mnf 11180 df-xr 11181 df-ltxr 11182 df-le 11183 df-sub 11377 df-neg 11378 df-div 11806 df-nn 12173 df-2 12242 df-n0 12436 df-z 12523 df-uz 12787 df-q 12897 df-rp 12941 df-xneg 13061 df-xadd 13062 df-xmul 13063 df-ico 13302 df-topgen 17404 df-psmet 21346 df-xmet 21347 df-bl 21349 df-mopn 21350 df-fbas 21351 df-top 22884 df-topon 22901 df-bases 22936 df-cld 23009 df-ntr 23010 df-cls 23011 df-nei 23088 df-fil 23836 df-flim 23929 df-fcls 23931 df-cfil 25247

This theorem is referenced by: relcmpcmet 25310

W3C validator