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Theorem metdseq0 22465

Description: The distance from a point to a set is zero iff the point is in the closure set. (Contributed by Mario Carneiro, 14-Feb-2015.)

**Hypotheses**
Ref	Expression
metdscn.f	⊢ 𝐹 = (𝑥 ∈ 𝑋 ↦ inf(ran (𝑦 ∈ 𝑆 ↦ (𝑥𝐷𝑦)), ℝ^*, < ))
metdscn.j	⊢ 𝐽 = (MetOpen‘𝐷)

**Assertion**
Ref	Expression
metdseq0	⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → ((𝐹‘𝐴) = 0 ↔ 𝐴 ∈ ((cls‘𝐽)‘𝑆)))

Distinct variable groups: 𝑥,𝑦,𝐴 𝑥,𝐷,𝑦 𝑦,𝐽 𝑥,𝑆,𝑦 𝑥,𝑋,𝑦 Allowed substitution hints: 𝐹(𝑥,𝑦) 𝐽(𝑥)

Proof of Theorem metdseq0 Dummy variables 𝑟 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpll1 1093	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) → 𝐷 ∈ (∞Met‘𝑋))
2		simprl 790	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) → 𝑧 ∈ 𝐽)
3		simprr 792	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) → 𝐴 ∈ 𝑧)
4		metdscn.j	. . . . . . . 8 ⊢ 𝐽 = (MetOpen‘𝐷)
5	4	mopni2 22108	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧) → ∃𝑟 ∈ ℝ⁺ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)
6	1, 2, 3, 5	syl3anc 1318	. . . . . 6 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) → ∃𝑟 ∈ ℝ⁺ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)
7		simprr 792	. . . . . . . 8 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)
8		ssrin 3800	. . . . . . . 8 ⊢ ((𝐴(ball‘𝐷)𝑟) ⊆ 𝑧 → ((𝐴(ball‘𝐷)𝑟) ∩ 𝑆) ⊆ (𝑧 ∩ 𝑆))
9	7, 8	syl 17	. . . . . . 7 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → ((𝐴(ball‘𝐷)𝑟) ∩ 𝑆) ⊆ (𝑧 ∩ 𝑆))
10		rpgt0 11720	. . . . . . . . . 10 ⊢ (𝑟 ∈ ℝ⁺ → 0 < 𝑟)
11		0re 9919	. . . . . . . . . . 11 ⊢ 0 ∈ ℝ
12		rpre 11715	. . . . . . . . . . 11 ⊢ (𝑟 ∈ ℝ⁺ → 𝑟 ∈ ℝ)
13		ltnle 9996	. . . . . . . . . . 11 ⊢ ((0 ∈ ℝ ∧ 𝑟 ∈ ℝ) → (0 < 𝑟 ↔ ¬ 𝑟 ≤ 0))
14	11, 12, 13	sylancr 694	. . . . . . . . . 10 ⊢ (𝑟 ∈ ℝ⁺ → (0 < 𝑟 ↔ ¬ 𝑟 ≤ 0))
15	10, 14	mpbid 221	. . . . . . . . 9 ⊢ (𝑟 ∈ ℝ⁺ → ¬ 𝑟 ≤ 0)
16	15	ad2antrl 760	. . . . . . . 8 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → ¬ 𝑟 ≤ 0)
17		simpllr 795	. . . . . . . . . . . 12 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → (𝐹‘𝐴) = 0)
18	17	breq2d 4595	. . . . . . . . . . 11 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → (𝑟 ≤ (𝐹‘𝐴) ↔ 𝑟 ≤ 0))
19	1	adantr 480	. . . . . . . . . . . 12 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → 𝐷 ∈ (∞Met‘𝑋))
20		simpl2 1058	. . . . . . . . . . . . 13 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝑆 ⊆ 𝑋)
21	20	ad2antrr 758	. . . . . . . . . . . 12 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → 𝑆 ⊆ 𝑋)
22		simpl3 1059	. . . . . . . . . . . . 13 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝐴 ∈ 𝑋)
23	22	ad2antrr 758	. . . . . . . . . . . 12 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → 𝐴 ∈ 𝑋)
24		rpxr 11716	. . . . . . . . . . . . 13 ⊢ (𝑟 ∈ ℝ⁺ → 𝑟 ∈ ℝ^*)
25	24	ad2antrl 760	. . . . . . . . . . . 12 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → 𝑟 ∈ ℝ^*)
26		metdscn.f	. . . . . . . . . . . . 13 ⊢ 𝐹 = (𝑥 ∈ 𝑋 ↦ inf(ran (𝑦 ∈ 𝑆 ↦ (𝑥𝐷𝑦)), ℝ^*, < ))
27	26	metdsge 22460	. . . . . . . . . . . 12 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑟 ∈ ℝ^*) → (𝑟 ≤ (𝐹‘𝐴) ↔ (𝑆 ∩ (𝐴(ball‘𝐷)𝑟)) = ∅))
28	19, 21, 23, 25, 27	syl31anc 1321	. . . . . . . . . . 11 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → (𝑟 ≤ (𝐹‘𝐴) ↔ (𝑆 ∩ (𝐴(ball‘𝐷)𝑟)) = ∅))
29	18, 28	bitr3d 269	. . . . . . . . . 10 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → (𝑟 ≤ 0 ↔ (𝑆 ∩ (𝐴(ball‘𝐷)𝑟)) = ∅))
30		incom 3767	. . . . . . . . . . 11 ⊢ (𝑆 ∩ (𝐴(ball‘𝐷)𝑟)) = ((𝐴(ball‘𝐷)𝑟) ∩ 𝑆)
31	30	eqeq1i 2615	. . . . . . . . . 10 ⊢ ((𝑆 ∩ (𝐴(ball‘𝐷)𝑟)) = ∅ ↔ ((𝐴(ball‘𝐷)𝑟) ∩ 𝑆) = ∅)
32	29, 31	syl6bb 275	. . . . . . . . 9 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → (𝑟 ≤ 0 ↔ ((𝐴(ball‘𝐷)𝑟) ∩ 𝑆) = ∅))
33	32	necon3bbid 2819	. . . . . . . 8 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → (¬ 𝑟 ≤ 0 ↔ ((𝐴(ball‘𝐷)𝑟) ∩ 𝑆) ≠ ∅))
34	16, 33	mpbid 221	. . . . . . 7 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → ((𝐴(ball‘𝐷)𝑟) ∩ 𝑆) ≠ ∅)
35		ssn0 3928	. . . . . . 7 ⊢ ((((𝐴(ball‘𝐷)𝑟) ∩ 𝑆) ⊆ (𝑧 ∩ 𝑆) ∧ ((𝐴(ball‘𝐷)𝑟) ∩ 𝑆) ≠ ∅) → (𝑧 ∩ 𝑆) ≠ ∅)
36	9, 34, 35	syl2anc 691	. . . . . 6 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → (𝑧 ∩ 𝑆) ≠ ∅)
37	6, 36	rexlimddv 3017	. . . . 5 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) → (𝑧 ∩ 𝑆) ≠ ∅)
38	37	expr 641	. . . 4 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ 𝑧 ∈ 𝐽) → (𝐴 ∈ 𝑧 → (𝑧 ∩ 𝑆) ≠ ∅))
39	38	ralrimiva 2949	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → ∀𝑧 ∈ 𝐽 (𝐴 ∈ 𝑧 → (𝑧 ∩ 𝑆) ≠ ∅))
40	4	mopntopon 22054	. . . . . . 7 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝐽 ∈ (TopOn‘𝑋))
41	40	3ad2ant1 1075	. . . . . 6 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → 𝐽 ∈ (TopOn‘𝑋))
42	41	adantr 480	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝐽 ∈ (TopOn‘𝑋))
43		topontop 20541	. . . . 5 ⊢ (𝐽 ∈ (TopOn‘𝑋) → 𝐽 ∈ Top)
44	42, 43	syl 17	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝐽 ∈ Top)
45		toponuni 20542	. . . . . 6 ⊢ (𝐽 ∈ (TopOn‘𝑋) → 𝑋 = ∪ 𝐽)
46	42, 45	syl 17	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝑋 = ∪ 𝐽)
47	20, 46	sseqtrd 3604	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝑆 ⊆ ∪ 𝐽)
48	22, 46	eleqtrd 2690	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝐴 ∈ ∪ 𝐽)
49		eqid 2610	. . . . 5 ⊢ ∪ 𝐽 = ∪ 𝐽
50	49	elcls 20687	. . . 4 ⊢ ((𝐽 ∈ Top ∧ 𝑆 ⊆ ∪ 𝐽 ∧ 𝐴 ∈ ∪ 𝐽) → (𝐴 ∈ ((cls‘𝐽)‘𝑆) ↔ ∀𝑧 ∈ 𝐽 (𝐴 ∈ 𝑧 → (𝑧 ∩ 𝑆) ≠ ∅)))
51	44, 47, 48, 50	syl3anc 1318	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → (𝐴 ∈ ((cls‘𝐽)‘𝑆) ↔ ∀𝑧 ∈ 𝐽 (𝐴 ∈ 𝑧 → (𝑧 ∩ 𝑆) ≠ ∅)))
52	39, 51	mpbird 246	. 2 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝐴 ∈ ((cls‘𝐽)‘𝑆))
53		incom 3767	. . . . . . 7 ⊢ ((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∩ 𝑆) = (𝑆 ∩ (𝐴(ball‘𝐷)(𝐹‘𝐴)))
54	26	metdsf 22459	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋) → 𝐹:𝑋⟶(0[,]+∞))
55	54	ffvelrnda 6267	. . . . . . . . . . 11 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋) ∧ 𝐴 ∈ 𝑋) → (𝐹‘𝐴) ∈ (0[,]+∞))
56	55	3impa 1251	. . . . . . . . . 10 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → (𝐹‘𝐴) ∈ (0[,]+∞))
57		elxrge0 12152	. . . . . . . . . . 11 ⊢ ((𝐹‘𝐴) ∈ (0[,]+∞) ↔ ((𝐹‘𝐴) ∈ ℝ^* ∧ 0 ≤ (𝐹‘𝐴)))
58	57	simplbi 475	. . . . . . . . . 10 ⊢ ((𝐹‘𝐴) ∈ (0[,]+∞) → (𝐹‘𝐴) ∈ ℝ^*)
59	56, 58	syl 17	. . . . . . . . 9 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → (𝐹‘𝐴) ∈ ℝ^*)
60		xrleid 11859	. . . . . . . . 9 ⊢ ((𝐹‘𝐴) ∈ ℝ^* → (𝐹‘𝐴) ≤ (𝐹‘𝐴))
61	59, 60	syl 17	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → (𝐹‘𝐴) ≤ (𝐹‘𝐴))
62	26	metdsge 22460	. . . . . . . . 9 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) ∈ ℝ^*) → ((𝐹‘𝐴) ≤ (𝐹‘𝐴) ↔ (𝑆 ∩ (𝐴(ball‘𝐷)(𝐹‘𝐴))) = ∅))
63	59, 62	mpdan 699	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → ((𝐹‘𝐴) ≤ (𝐹‘𝐴) ↔ (𝑆 ∩ (𝐴(ball‘𝐷)(𝐹‘𝐴))) = ∅))
64	61, 63	mpbid 221	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → (𝑆 ∩ (𝐴(ball‘𝐷)(𝐹‘𝐴))) = ∅)
65	53, 64	syl5eq 2656	. . . . . 6 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → ((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∩ 𝑆) = ∅)
66	65	adantr 480	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → ((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∩ 𝑆) = ∅)
67	41	ad2antrr 758	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝐽 ∈ (TopOn‘𝑋))
68	67, 43	syl 17	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝐽 ∈ Top)
69		simpll2 1094	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝑆 ⊆ 𝑋)
70	67, 45	syl 17	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝑋 = ∪ 𝐽)
71	69, 70	sseqtrd 3604	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝑆 ⊆ ∪ 𝐽)
72		simplr 788	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝐴 ∈ ((cls‘𝐽)‘𝑆))
73		simpll1 1093	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝐷 ∈ (∞Met‘𝑋))
74		simpll3 1095	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝐴 ∈ 𝑋)
75	59	ad2antrr 758	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → (𝐹‘𝐴) ∈ ℝ^*)
76	4	blopn 22115	. . . . . . . . 9 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐴 ∈ 𝑋 ∧ (𝐹‘𝐴) ∈ ℝ^*) → (𝐴(ball‘𝐷)(𝐹‘𝐴)) ∈ 𝐽)
77	73, 74, 75, 76	syl3anc 1318	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → (𝐴(ball‘𝐷)(𝐹‘𝐴)) ∈ 𝐽)
78		simpr 476	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 0 < (𝐹‘𝐴))
79		xblcntr 22026	. . . . . . . . 9 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐴 ∈ 𝑋 ∧ ((𝐹‘𝐴) ∈ ℝ^* ∧ 0 < (𝐹‘𝐴))) → 𝐴 ∈ (𝐴(ball‘𝐷)(𝐹‘𝐴)))
80	73, 74, 75, 78, 79	syl112anc 1322	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝐴 ∈ (𝐴(ball‘𝐷)(𝐹‘𝐴)))
81	49	clsndisj 20689	. . . . . . . 8 ⊢ (((𝐽 ∈ Top ∧ 𝑆 ⊆ ∪ 𝐽 ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ ((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∈ 𝐽 ∧ 𝐴 ∈ (𝐴(ball‘𝐷)(𝐹‘𝐴)))) → ((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∩ 𝑆) ≠ ∅)
82	68, 71, 72, 77, 80, 81	syl32anc 1326	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → ((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∩ 𝑆) ≠ ∅)
83	82	ex 449	. . . . . 6 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → (0 < (𝐹‘𝐴) → ((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∩ 𝑆) ≠ ∅))
84	83	necon2bd 2798	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → (((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∩ 𝑆) = ∅ → ¬ 0 < (𝐹‘𝐴)))
85	66, 84	mpd 15	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → ¬ 0 < (𝐹‘𝐴))
86	57	simprbi 479	. . . . . . . 8 ⊢ ((𝐹‘𝐴) ∈ (0[,]+∞) → 0 ≤ (𝐹‘𝐴))
87	56, 86	syl 17	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → 0 ≤ (𝐹‘𝐴))
88		0xr 9965	. . . . . . . 8 ⊢ 0 ∈ ℝ^*
89		xrleloe 11853	. . . . . . . 8 ⊢ ((0 ∈ ℝ^* ∧ (𝐹‘𝐴) ∈ ℝ^*) → (0 ≤ (𝐹‘𝐴) ↔ (0 < (𝐹‘𝐴) ∨ 0 = (𝐹‘𝐴))))
90	88, 59, 89	sylancr 694	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → (0 ≤ (𝐹‘𝐴) ↔ (0 < (𝐹‘𝐴) ∨ 0 = (𝐹‘𝐴))))
91	87, 90	mpbid 221	. . . . . 6 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → (0 < (𝐹‘𝐴) ∨ 0 = (𝐹‘𝐴)))
92	91	adantr 480	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → (0 < (𝐹‘𝐴) ∨ 0 = (𝐹‘𝐴)))
93	92	ord 391	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → (¬ 0 < (𝐹‘𝐴) → 0 = (𝐹‘𝐴)))
94	85, 93	mpd 15	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → 0 = (𝐹‘𝐴))
95	94	eqcomd 2616	. 2 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → (𝐹‘𝐴) = 0)
96	52, 95	impbida 873	1 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → ((𝐹‘𝐴) = 0 ↔ 𝐴 ∈ ((cls‘𝐽)‘𝑆)))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 195 ∨ wo 382 ∧ wa 383 ∧ w3a 1031 = wceq 1475 ∈ wcel 1977 ≠ wne 2780 ∀wral 2896 ∃wrex 2897 ∩ cin 3539 ⊆ wss 3540 ∅c0 3874 ∪ cuni 4372 class class class wbr 4583 ↦ cmpt 4643 ran crn 5039 ‘cfv 5804 (class class class)co 6549 infcinf 8230 ℝcr 9814 0cc0 9815 +∞cpnf 9950 ℝ^*cxr 9952 < clt 9953 ≤ cle 9954 ℝ⁺crp 11708 [,]cicc 12049 ∞Metcxmt 19552 ballcbl 19554 MetOpencmopn 19557 Topctop 20517 TopOnctopon 20518 clsccl 20632

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-rep 4699 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 ax-un 6847 ax-cnex 9871 ax-resscn 9872 ax-1cn 9873 ax-icn 9874 ax-addcl 9875 ax-addrcl 9876 ax-mulcl 9877 ax-mulrcl 9878 ax-mulcom 9879 ax-addass 9880 ax-mulass 9881 ax-distr 9882 ax-i2m1 9883 ax-1ne0 9884 ax-1rid 9885 ax-rnegex 9886 ax-rrecex 9887 ax-cnre 9888 ax-pre-lttri 9889 ax-pre-lttrn 9890 ax-pre-ltadd 9891 ax-pre-mulgt0 9892 ax-pre-sup 9893

This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-nel 2783 df-ral 2901 df-rex 2902 df-reu 2903 df-rmo 2904 df-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-pss 3556 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-tp 4130 df-op 4132 df-uni 4373 df-int 4411 df-iun 4457 df-iin 4458 df-br 4584 df-opab 4644 df-mpt 4645 df-tr 4681 df-eprel 4949 df-id 4953 df-po 4959 df-so 4960 df-fr 4997 df-we 4999 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-pred 5597 df-ord 5643 df-on 5644 df-lim 5645 df-suc 5646 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-f1 5809 df-fo 5810 df-f1o 5811 df-fv 5812 df-riota 6511 df-ov 6552 df-oprab 6553 df-mpt2 6554 df-om 6958 df-1st 7059 df-2nd 7060 df-wrecs 7294 df-recs 7355 df-rdg 7393 df-er 7629 df-map 7746 df-en 7842 df-dom 7843 df-sdom 7844 df-sup 8231 df-inf 8232 df-pnf 9955 df-mnf 9956 df-xr 9957 df-ltxr 9958 df-le 9959 df-sub 10147 df-neg 10148 df-div 10564 df-nn 10898 df-2 10956 df-n0 11170 df-z 11255 df-uz 11564 df-q 11665 df-rp 11709 df-xneg 11822 df-xadd 11823 df-xmul 11824 df-icc 12053 df-topgen 15927 df-psmet 19559 df-xmet 19560 df-bl 19562 df-mopn 19563 df-top 20521 df-bases 20522 df-topon 20523 df-cld 20633 df-ntr 20634 df-cls 20635

This theorem is referenced by: metnrmlem1a 22469 lebnumlem1 22568

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