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Theorem metdseq0 24757

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 1210	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) → 𝐷 ∈ (∞Met‘𝑋))
2		simprl 770	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) → 𝑧 ∈ 𝐽)
3		simprr 772	. . . . . . 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 24389	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧) → ∃𝑟 ∈ ℝ⁺ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)
6	1, 2, 3, 5	syl3anc 1369	. . . . . 6 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) → ∃𝑟 ∈ ℝ⁺ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)
7		simprr 772	. . . . . . . 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	7	ssrind 4231	. . . . . . 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))
9		rpgt0 13010	. . . . . . . . . 10 ⊢ (𝑟 ∈ ℝ⁺ → 0 < 𝑟)
10		0re 11238	. . . . . . . . . . 11 ⊢ 0 ∈ ℝ
11		rpre 13006	. . . . . . . . . . 11 ⊢ (𝑟 ∈ ℝ⁺ → 𝑟 ∈ ℝ)
12		ltnle 11315	. . . . . . . . . . 11 ⊢ ((0 ∈ ℝ ∧ 𝑟 ∈ ℝ) → (0 < 𝑟 ↔ ¬ 𝑟 ≤ 0))
13	10, 11, 12	sylancr 586	. . . . . . . . . 10 ⊢ (𝑟 ∈ ℝ⁺ → (0 < 𝑟 ↔ ¬ 𝑟 ≤ 0))
14	9, 13	mpbid 231	. . . . . . . . 9 ⊢ (𝑟 ∈ ℝ⁺ → ¬ 𝑟 ≤ 0)
15	14	ad2antrl 727	. . . . . . . 8 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → ¬ 𝑟 ≤ 0)
16		simpllr 775	. . . . . . . . . . . 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)
17	16	breq2d 5154	. . . . . . . . . . 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))
18	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))
19		simpl2 1190	. . . . . . . . . . . . 13 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝑆 ⊆ 𝑋)
20	19	ad2antrr 725	. . . . . . . . . . . 12 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → 𝑆 ⊆ 𝑋)
21		simpl3 1191	. . . . . . . . . . . . 13 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝐴 ∈ 𝑋)
22	21	ad2antrr 725	. . . . . . . . . . . 12 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → 𝐴 ∈ 𝑋)
23		rpxr 13007	. . . . . . . . . . . . 13 ⊢ (𝑟 ∈ ℝ⁺ → 𝑟 ∈ ℝ^*)
24	23	ad2antrl 727	. . . . . . . . . . . 12 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → 𝑟 ∈ ℝ^*)
25		metdscn.f	. . . . . . . . . . . . 13 ⊢ 𝐹 = (𝑥 ∈ 𝑋 ↦ inf(ran (𝑦 ∈ 𝑆 ↦ (𝑥𝐷𝑦)), ℝ^*, < ))
26	25	metdsge 24752	. . . . . . . . . . . 12 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑟 ∈ ℝ^*) → (𝑟 ≤ (𝐹‘𝐴) ↔ (𝑆 ∩ (𝐴(ball‘𝐷)𝑟)) = ∅))
27	18, 20, 22, 24, 26	syl31anc 1371	. . . . . . . . . . 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)) = ∅))
28	17, 27	bitr3d 281	. . . . . . . . . 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)) = ∅))
29		incom 4197	. . . . . . . . . . 11 ⊢ (𝑆 ∩ (𝐴(ball‘𝐷)𝑟)) = ((𝐴(ball‘𝐷)𝑟) ∩ 𝑆)
30	29	eqeq1i 2732	. . . . . . . . . 10 ⊢ ((𝑆 ∩ (𝐴(ball‘𝐷)𝑟)) = ∅ ↔ ((𝐴(ball‘𝐷)𝑟) ∩ 𝑆) = ∅)
31	28, 30	bitrdi 287	. . . . . . . . 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) = ∅))
32	31	necon3bbid 2973	. . . . . . . 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) ≠ ∅))
33	15, 32	mpbid 231	. . . . . . 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) ≠ ∅)
34		ssn0 4396	. . . . . . 7 ⊢ ((((𝐴(ball‘𝐷)𝑟) ∩ 𝑆) ⊆ (𝑧 ∩ 𝑆) ∧ ((𝐴(ball‘𝐷)𝑟) ∩ 𝑆) ≠ ∅) → (𝑧 ∩ 𝑆) ≠ ∅)
35	8, 33, 34	syl2anc 583	. . . . . 6 ⊢ (((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) ∧ (𝑟 ∈ ℝ⁺ ∧ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)) → (𝑧 ∩ 𝑆) ≠ ∅)
36	6, 35	rexlimddv 3156	. . . . 5 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) → (𝑧 ∩ 𝑆) ≠ ∅)
37	36	expr 456	. . . 4 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ 𝑧 ∈ 𝐽) → (𝐴 ∈ 𝑧 → (𝑧 ∩ 𝑆) ≠ ∅))
38	37	ralrimiva 3141	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → ∀𝑧 ∈ 𝐽 (𝐴 ∈ 𝑧 → (𝑧 ∩ 𝑆) ≠ ∅))
39	4	mopntopon 24332	. . . . . . 7 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝐽 ∈ (TopOn‘𝑋))
40	39	3ad2ant1 1131	. . . . . 6 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → 𝐽 ∈ (TopOn‘𝑋))
41	40	adantr 480	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝐽 ∈ (TopOn‘𝑋))
42		topontop 22802	. . . . 5 ⊢ (𝐽 ∈ (TopOn‘𝑋) → 𝐽 ∈ Top)
43	41, 42	syl 17	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝐽 ∈ Top)
44		toponuni 22803	. . . . . 6 ⊢ (𝐽 ∈ (TopOn‘𝑋) → 𝑋 = ∪ 𝐽)
45	41, 44	syl 17	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝑋 = ∪ 𝐽)
46	19, 45	sseqtrd 4018	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝑆 ⊆ ∪ 𝐽)
47	21, 45	eleqtrd 2830	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝐴 ∈ ∪ 𝐽)
48		eqid 2727	. . . . 5 ⊢ ∪ 𝐽 = ∪ 𝐽
49	48	elcls 22964	. . . 4 ⊢ ((𝐽 ∈ Top ∧ 𝑆 ⊆ ∪ 𝐽 ∧ 𝐴 ∈ ∪ 𝐽) → (𝐴 ∈ ((cls‘𝐽)‘𝑆) ↔ ∀𝑧 ∈ 𝐽 (𝐴 ∈ 𝑧 → (𝑧 ∩ 𝑆) ≠ ∅)))
50	43, 46, 47, 49	syl3anc 1369	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → (𝐴 ∈ ((cls‘𝐽)‘𝑆) ↔ ∀𝑧 ∈ 𝐽 (𝐴 ∈ 𝑧 → (𝑧 ∩ 𝑆) ≠ ∅)))
51	38, 50	mpbird 257	. 2 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝐴 ∈ ((cls‘𝐽)‘𝑆))
52		incom 4197	. . . . . . 7 ⊢ ((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∩ 𝑆) = (𝑆 ∩ (𝐴(ball‘𝐷)(𝐹‘𝐴)))
53	25	metdsf 24751	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋) → 𝐹:𝑋⟶(0[,]+∞))
54	53	ffvelcdmda 7088	. . . . . . . . . . 11 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋) ∧ 𝐴 ∈ 𝑋) → (𝐹‘𝐴) ∈ (0[,]+∞))
55	54	3impa 1108	. . . . . . . . . 10 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → (𝐹‘𝐴) ∈ (0[,]+∞))
56		eliccxr 13436	. . . . . . . . . 10 ⊢ ((𝐹‘𝐴) ∈ (0[,]+∞) → (𝐹‘𝐴) ∈ ℝ^*)
57	55, 56	syl 17	. . . . . . . . 9 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → (𝐹‘𝐴) ∈ ℝ^*)
58	57	xrleidd 13155	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → (𝐹‘𝐴) ≤ (𝐹‘𝐴))
59	25	metdsge 24752	. . . . . . . . 9 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) ∈ ℝ^*) → ((𝐹‘𝐴) ≤ (𝐹‘𝐴) ↔ (𝑆 ∩ (𝐴(ball‘𝐷)(𝐹‘𝐴))) = ∅))
60	57, 59	mpdan 686	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → ((𝐹‘𝐴) ≤ (𝐹‘𝐴) ↔ (𝑆 ∩ (𝐴(ball‘𝐷)(𝐹‘𝐴))) = ∅))
61	58, 60	mpbid 231	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → (𝑆 ∩ (𝐴(ball‘𝐷)(𝐹‘𝐴))) = ∅)
62	52, 61	eqtrid 2779	. . . . . 6 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → ((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∩ 𝑆) = ∅)
63	62	adantr 480	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → ((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∩ 𝑆) = ∅)
64	40	ad2antrr 725	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝐽 ∈ (TopOn‘𝑋))
65	64, 42	syl 17	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝐽 ∈ Top)
66		simpll2 1211	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝑆 ⊆ 𝑋)
67	64, 44	syl 17	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝑋 = ∪ 𝐽)
68	66, 67	sseqtrd 4018	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝑆 ⊆ ∪ 𝐽)
69		simplr 768	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝐴 ∈ ((cls‘𝐽)‘𝑆))
70		simpll1 1210	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝐷 ∈ (∞Met‘𝑋))
71		simpll3 1212	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝐴 ∈ 𝑋)
72	57	ad2antrr 725	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → (𝐹‘𝐴) ∈ ℝ^*)
73	4	blopn 24396	. . . . . . . . 9 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐴 ∈ 𝑋 ∧ (𝐹‘𝐴) ∈ ℝ^*) → (𝐴(ball‘𝐷)(𝐹‘𝐴)) ∈ 𝐽)
74	70, 71, 72, 73	syl3anc 1369	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → (𝐴(ball‘𝐷)(𝐹‘𝐴)) ∈ 𝐽)
75		simpr 484	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 0 < (𝐹‘𝐴))
76		xblcntr 24304	. . . . . . . . 9 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐴 ∈ 𝑋 ∧ ((𝐹‘𝐴) ∈ ℝ^* ∧ 0 < (𝐹‘𝐴))) → 𝐴 ∈ (𝐴(ball‘𝐷)(𝐹‘𝐴)))
77	70, 71, 72, 75, 76	syl112anc 1372	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝐴 ∈ (𝐴(ball‘𝐷)(𝐹‘𝐴)))
78	48	clsndisj 22966	. . . . . . . 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) ≠ ∅)
79	65, 68, 69, 74, 77, 78	syl32anc 1376	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → ((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∩ 𝑆) ≠ ∅)
80	79	ex 412	. . . . . 6 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → (0 < (𝐹‘𝐴) → ((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∩ 𝑆) ≠ ∅))
81	80	necon2bd 2951	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → (((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∩ 𝑆) = ∅ → ¬ 0 < (𝐹‘𝐴)))
82	63, 81	mpd 15	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → ¬ 0 < (𝐹‘𝐴))
83		elxrge0 13458	. . . . . . . . 9 ⊢ ((𝐹‘𝐴) ∈ (0[,]+∞) ↔ ((𝐹‘𝐴) ∈ ℝ^* ∧ 0 ≤ (𝐹‘𝐴)))
84	83	simprbi 496	. . . . . . . 8 ⊢ ((𝐹‘𝐴) ∈ (0[,]+∞) → 0 ≤ (𝐹‘𝐴))
85	55, 84	syl 17	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → 0 ≤ (𝐹‘𝐴))
86		0xr 11283	. . . . . . . 8 ⊢ 0 ∈ ℝ^*
87		xrleloe 13147	. . . . . . . 8 ⊢ ((0 ∈ ℝ^* ∧ (𝐹‘𝐴) ∈ ℝ^*) → (0 ≤ (𝐹‘𝐴) ↔ (0 < (𝐹‘𝐴) ∨ 0 = (𝐹‘𝐴))))
88	86, 57, 87	sylancr 586	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → (0 ≤ (𝐹‘𝐴) ↔ (0 < (𝐹‘𝐴) ∨ 0 = (𝐹‘𝐴))))
89	85, 88	mpbid 231	. . . . . 6 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → (0 < (𝐹‘𝐴) ∨ 0 = (𝐹‘𝐴)))
90	89	adantr 480	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → (0 < (𝐹‘𝐴) ∨ 0 = (𝐹‘𝐴)))
91	90	ord 863	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → (¬ 0 < (𝐹‘𝐴) → 0 = (𝐹‘𝐴)))
92	82, 91	mpd 15	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → 0 = (𝐹‘𝐴))
93	92	eqcomd 2733	. 2 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → (𝐹‘𝐴) = 0)
94	51, 93	impbida 800	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 205 ∧ wa 395 ∨ wo 846 ∧ w3a 1085 = wceq 1534 ∈ wcel 2099 ≠ wne 2935 ∀wral 3056 ∃wrex 3065 ∩ cin 3943 ⊆ wss 3944 ∅c0 4318 ∪ cuni 4903 class class class wbr 5142 ↦ cmpt 5225 ran crn 5673 ‘cfv 6542 (class class class)co 7414 infcinf 9456 ℝcr 11129 0cc0 11130 +∞cpnf 11267 ℝ^*cxr 11269 < clt 11270 ≤ cle 11271 ℝ⁺crp 12998 [,]cicc 13351 ∞Metcxmet 21251 ballcbl 21253 MetOpencmopn 21256 Topctop 22782 TopOnctopon 22799 clsccl 22909

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2164 ax-ext 2698 ax-rep 5279 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-cnex 11186 ax-resscn 11187 ax-1cn 11188 ax-icn 11189 ax-addcl 11190 ax-addrcl 11191 ax-mulcl 11192 ax-mulrcl 11193 ax-mulcom 11194 ax-addass 11195 ax-mulass 11196 ax-distr 11197 ax-i2m1 11198 ax-1ne0 11199 ax-1rid 11200 ax-rnegex 11201 ax-rrecex 11202 ax-cnre 11203 ax-pre-lttri 11204 ax-pre-lttrn 11205 ax-pre-ltadd 11206 ax-pre-mulgt0 11207 ax-pre-sup 11208

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2529 df-eu 2558 df-clab 2705 df-cleq 2719 df-clel 2805 df-nfc 2880 df-ne 2936 df-nel 3042 df-ral 3057 df-rex 3066 df-rmo 3371 df-reu 3372 df-rab 3428 df-v 3471 df-sbc 3775 df-csb 3890 df-dif 3947 df-un 3949 df-in 3951 df-ss 3961 df-pss 3963 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-int 4945 df-iun 4993 df-iin 4994 df-br 5143 df-opab 5205 df-mpt 5226 df-tr 5260 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-pred 6299 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-riota 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 df-om 7865 df-1st 7987 df-2nd 7988 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-er 8718 df-map 8838 df-en 8956 df-dom 8957 df-sdom 8958 df-sup 9457 df-inf 9458 df-pnf 11272 df-mnf 11273 df-xr 11274 df-ltxr 11275 df-le 11276 df-sub 11468 df-neg 11469 df-div 11894 df-nn 12235 df-2 12297 df-n0 12495 df-z 12581 df-uz 12845 df-q 12955 df-rp 12999 df-xneg 13116 df-xadd 13117 df-xmul 13118 df-icc 13355 df-topgen 17416 df-psmet 21258 df-xmet 21259 df-bl 21261 df-mopn 21262 df-top 22783 df-topon 22800 df-bases 22836 df-cld 22910 df-ntr 22911 df-cls 22912

This theorem is referenced by: metnrmlem1a 24761 lebnumlem1 24874

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