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Theorem metdseq0 24800

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 1209	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) → 𝐷 ∈ (∞Met‘𝑋))
2		simprl 769	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) → 𝑧 ∈ 𝐽)
3		simprr 771	. . . . . . 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 24432	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧) → ∃𝑟 ∈ ℝ⁺ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)
6	1, 2, 3, 5	syl3anc 1368	. . . . . 6 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) → ∃𝑟 ∈ ℝ⁺ (𝐴(ball‘𝐷)𝑟) ⊆ 𝑧)
7		simprr 771	. . . . . . . 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 4235	. . . . . . 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 13018	. . . . . . . . . 10 ⊢ (𝑟 ∈ ℝ⁺ → 0 < 𝑟)
10		0re 11246	. . . . . . . . . . 11 ⊢ 0 ∈ ℝ
11		rpre 13014	. . . . . . . . . . 11 ⊢ (𝑟 ∈ ℝ⁺ → 𝑟 ∈ ℝ)
12		ltnle 11323	. . . . . . . . . . 11 ⊢ ((0 ∈ ℝ ∧ 𝑟 ∈ ℝ) → (0 < 𝑟 ↔ ¬ 𝑟 ≤ 0))
13	10, 11, 12	sylancr 585	. . . . . . . . . 10 ⊢ (𝑟 ∈ ℝ⁺ → (0 < 𝑟 ↔ ¬ 𝑟 ≤ 0))
14	9, 13	mpbid 231	. . . . . . . . 9 ⊢ (𝑟 ∈ ℝ⁺ → ¬ 𝑟 ≤ 0)
15	14	ad2antrl 726	. . . . . . . 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 774	. . . . . . . . . . . 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 5160	. . . . . . . . . . 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 479	. . . . . . . . . . . 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 1189	. . . . . . . . . . . . 13 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝑆 ⊆ 𝑋)
20	19	ad2antrr 724	. . . . . . . . . . . 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 1190	. . . . . . . . . . . . 13 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝐴 ∈ 𝑋)
22	21	ad2antrr 724	. . . . . . . . . . . 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 13015	. . . . . . . . . . . . 13 ⊢ (𝑟 ∈ ℝ⁺ → 𝑟 ∈ ℝ^*)
24	23	ad2antrl 726	. . . . . . . . . . . 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 24795	. . . . . . . . . . . 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 1370	. . . . . . . . . . 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 280	. . . . . . . . . 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 4200	. . . . . . . . . . 11 ⊢ (𝑆 ∩ (𝐴(ball‘𝐷)𝑟)) = ((𝐴(ball‘𝐷)𝑟) ∩ 𝑆)
30	29	eqeq1i 2730	. . . . . . . . . 10 ⊢ ((𝑆 ∩ (𝐴(ball‘𝐷)𝑟)) = ∅ ↔ ((𝐴(ball‘𝐷)𝑟) ∩ 𝑆) = ∅)
31	28, 30	bitrdi 286	. . . . . . . . 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 2968	. . . . . . . 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 4401	. . . . . . 7 ⊢ ((((𝐴(ball‘𝐷)𝑟) ∩ 𝑆) ⊆ (𝑧 ∩ 𝑆) ∧ ((𝐴(ball‘𝐷)𝑟) ∩ 𝑆) ≠ ∅) → (𝑧 ∩ 𝑆) ≠ ∅)
35	8, 33, 34	syl2anc 582	. . . . . 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 3151	. . . . 5 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ (𝑧 ∈ 𝐽 ∧ 𝐴 ∈ 𝑧)) → (𝑧 ∩ 𝑆) ≠ ∅)
37	36	expr 455	. . . 4 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) ∧ 𝑧 ∈ 𝐽) → (𝐴 ∈ 𝑧 → (𝑧 ∩ 𝑆) ≠ ∅))
38	37	ralrimiva 3136	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → ∀𝑧 ∈ 𝐽 (𝐴 ∈ 𝑧 → (𝑧 ∩ 𝑆) ≠ ∅))
39	4	mopntopon 24375	. . . . . . 7 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝐽 ∈ (TopOn‘𝑋))
40	39	3ad2ant1 1130	. . . . . 6 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → 𝐽 ∈ (TopOn‘𝑋))
41	40	adantr 479	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝐽 ∈ (TopOn‘𝑋))
42		topontop 22845	. . . . 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 22846	. . . . . 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 2827	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝐴 ∈ ∪ 𝐽)
48		eqid 2725	. . . . 5 ⊢ ∪ 𝐽 = ∪ 𝐽
49	48	elcls 23007	. . . 4 ⊢ ((𝐽 ∈ Top ∧ 𝑆 ⊆ ∪ 𝐽 ∧ 𝐴 ∈ ∪ 𝐽) → (𝐴 ∈ ((cls‘𝐽)‘𝑆) ↔ ∀𝑧 ∈ 𝐽 (𝐴 ∈ 𝑧 → (𝑧 ∩ 𝑆) ≠ ∅)))
50	43, 46, 47, 49	syl3anc 1368	. . 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 256	. 2 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ (𝐹‘𝐴) = 0) → 𝐴 ∈ ((cls‘𝐽)‘𝑆))
52		incom 4200	. . . . . . 7 ⊢ ((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∩ 𝑆) = (𝑆 ∩ (𝐴(ball‘𝐷)(𝐹‘𝐴)))
53	25	metdsf 24794	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋) → 𝐹:𝑋⟶(0[,]+∞))
54	53	ffvelcdmda 7091	. . . . . . . . . . 11 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋) ∧ 𝐴 ∈ 𝑋) → (𝐹‘𝐴) ∈ (0[,]+∞))
55	54	3impa 1107	. . . . . . . . . 10 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → (𝐹‘𝐴) ∈ (0[,]+∞))
56		eliccxr 13444	. . . . . . . . . 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 13163	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → (𝐹‘𝐴) ≤ (𝐹‘𝐴))
59	25	metdsge 24795	. . . . . . . . 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 685	. . . . . . . 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 2777	. . . . . 6 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → ((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∩ 𝑆) = ∅)
63	62	adantr 479	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → ((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∩ 𝑆) = ∅)
64	40	ad2antrr 724	. . . . . . . . 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 1210	. . . . . . . . 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 767	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝐴 ∈ ((cls‘𝐽)‘𝑆))
70		simpll1 1209	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝐷 ∈ (∞Met‘𝑋))
71		simpll3 1211	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝐴 ∈ 𝑋)
72	57	ad2antrr 724	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → (𝐹‘𝐴) ∈ ℝ^*)
73	4	blopn 24439	. . . . . . . . 9 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐴 ∈ 𝑋 ∧ (𝐹‘𝐴) ∈ ℝ^*) → (𝐴(ball‘𝐷)(𝐹‘𝐴)) ∈ 𝐽)
74	70, 71, 72, 73	syl3anc 1368	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → (𝐴(ball‘𝐷)(𝐹‘𝐴)) ∈ 𝐽)
75		simpr 483	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 0 < (𝐹‘𝐴))
76		xblcntr 24347	. . . . . . . . 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 1371	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → 𝐴 ∈ (𝐴(ball‘𝐷)(𝐹‘𝐴)))
78	48	clsndisj 23009	. . . . . . . 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 1375	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) ∧ 0 < (𝐹‘𝐴)) → ((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∩ 𝑆) ≠ ∅)
80	79	ex 411	. . . . . 6 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → (0 < (𝐹‘𝐴) → ((𝐴(ball‘𝐷)(𝐹‘𝐴)) ∩ 𝑆) ≠ ∅))
81	80	necon2bd 2946	. . . . 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 13466	. . . . . . . . 9 ⊢ ((𝐹‘𝐴) ∈ (0[,]+∞) ↔ ((𝐹‘𝐴) ∈ ℝ^* ∧ 0 ≤ (𝐹‘𝐴)))
84	83	simprbi 495	. . . . . . . 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 11291	. . . . . . . 8 ⊢ 0 ∈ ℝ^*
87		xrleloe 13155	. . . . . . . 8 ⊢ ((0 ∈ ℝ^* ∧ (𝐹‘𝐴) ∈ ℝ^*) → (0 ≤ (𝐹‘𝐴) ↔ (0 < (𝐹‘𝐴) ∨ 0 = (𝐹‘𝐴))))
88	86, 57, 87	sylancr 585	. . . . . . 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 479	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → (0 < (𝐹‘𝐴) ∨ 0 = (𝐹‘𝐴)))
91	90	ord 862	. . . 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 2731	. 2 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝐴 ∈ ((cls‘𝐽)‘𝑆)) → (𝐹‘𝐴) = 0)
94	51, 93	impbida 799	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 394 ∨ wo 845 ∧ w3a 1084 = wceq 1533 ∈ wcel 2098 ≠ wne 2930 ∀wral 3051 ∃wrex 3060 ∩ cin 3944 ⊆ wss 3945 ∅c0 4323 ∪ cuni 4908 class class class wbr 5148 ↦ cmpt 5231 ran crn 5678 ‘cfv 6547 (class class class)co 7417 infcinf 9464 ℝcr 11137 0cc0 11138 +∞cpnf 11275 ℝ^*cxr 11277 < clt 11278 ≤ cle 11279 ℝ⁺crp 13006 [,]cicc 13359 ∞Metcxmet 21268 ballcbl 21270 MetOpencmopn 21273 Topctop 22825 TopOnctopon 22842 clsccl 22952

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 2696 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5364 ax-pr 5428 ax-un 7739 ax-cnex 11194 ax-resscn 11195 ax-1cn 11196 ax-icn 11197 ax-addcl 11198 ax-addrcl 11199 ax-mulcl 11200 ax-mulrcl 11201 ax-mulcom 11202 ax-addass 11203 ax-mulass 11204 ax-distr 11205 ax-i2m1 11206 ax-1ne0 11207 ax-1rid 11208 ax-rnegex 11209 ax-rrecex 11210 ax-cnre 11211 ax-pre-lttri 11212 ax-pre-lttrn 11213 ax-pre-ltadd 11214 ax-pre-mulgt0 11215 ax-pre-sup 11216

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 2528 df-eu 2557 df-clab 2703 df-cleq 2717 df-clel 2802 df-nfc 2877 df-ne 2931 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3364 df-reu 3365 df-rab 3420 df-v 3465 df-sbc 3775 df-csb 3891 df-dif 3948 df-un 3950 df-in 3952 df-ss 3962 df-pss 3965 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4909 df-int 4950 df-iun 4998 df-iin 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6305 df-ord 6372 df-on 6373 df-lim 6374 df-suc 6375 df-iota 6499 df-fun 6549 df-fn 6550 df-f 6551 df-f1 6552 df-fo 6553 df-f1o 6554 df-fv 6555 df-riota 7373 df-ov 7420 df-oprab 7421 df-mpo 7422 df-om 7870 df-1st 7992 df-2nd 7993 df-frecs 8285 df-wrecs 8316 df-recs 8390 df-rdg 8429 df-er 8723 df-map 8845 df-en 8963 df-dom 8964 df-sdom 8965 df-sup 9465 df-inf 9466 df-pnf 11280 df-mnf 11281 df-xr 11282 df-ltxr 11283 df-le 11284 df-sub 11476 df-neg 11477 df-div 11902 df-nn 12243 df-2 12305 df-n0 12503 df-z 12589 df-uz 12853 df-q 12963 df-rp 13007 df-xneg 13124 df-xadd 13125 df-xmul 13126 df-icc 13363 df-topgen 17424 df-psmet 21275 df-xmet 21276 df-bl 21278 df-mopn 21279 df-top 22826 df-topon 22843 df-bases 22879 df-cld 22953 df-ntr 22954 df-cls 22955

This theorem is referenced by: metnrmlem1a 24804 lebnumlem1 24917

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