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Theorem blcld 24005

Description: A "closed ball" in a metric space is actually closed. (Contributed by Mario Carneiro, 31-Dec-2013.) (Revised by Mario Carneiro, 24-Aug-2015.)

**Hypotheses**
Ref	Expression
mopni.1	⊢ 𝐽 = (MetOpen‘𝐷)
blcld.3	⊢ 𝑆 = {𝑧 ∈ 𝑋 ∣ (𝑃𝐷𝑧) ≤ 𝑅}

**Assertion**
Ref	Expression
blcld	⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → 𝑆 ∈ (Clsd‘𝐽))

Distinct variable groups: 𝑧,𝐷 𝑧,𝑅 𝑧,𝑃 𝑧,𝑋 Allowed substitution hints: 𝑆(𝑧) 𝐽(𝑧)

Proof of Theorem blcld Dummy variables 𝑥 𝑦 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		mopni.1	. . . . . 6 ⊢ 𝐽 = (MetOpen‘𝐷)
2	1	mopnuni 23938	. . . . 5 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝑋 = ∪ 𝐽)
3	2	3ad2ant1 1133	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → 𝑋 = ∪ 𝐽)
4	3	difeq1d 4120	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → (𝑋 ∖ 𝑆) = (∪ 𝐽 ∖ 𝑆))
5		difssd 4131	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → (𝑋 ∖ 𝑆) ⊆ 𝑋)
6		simpl3 1193	. . . . . . 7 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → 𝑅 ∈ ℝ^)
7		simpl1 1191	. . . . . . . 8 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → 𝐷 ∈ (∞Met‘𝑋))
8		simpl2 1192	. . . . . . . 8 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → 𝑃 ∈ 𝑋)
9		eldifi 4125	. . . . . . . . 9 ⊢ (𝑦 ∈ (𝑋 ∖ 𝑆) → 𝑦 ∈ 𝑋)
10	9	adantl 482	. . . . . . . 8 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → 𝑦 ∈ 𝑋)
11		xmetcl 23828	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) → (𝑃𝐷𝑦) ∈ ℝ^*)
12	7, 8, 10, 11	syl3anc 1371	. . . . . . 7 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → (𝑃𝐷𝑦) ∈ ℝ^)
13		eldif 3957	. . . . . . . . . 10 ⊢ (𝑦 ∈ (𝑋 ∖ 𝑆) ↔ (𝑦 ∈ 𝑋 ∧ ¬ 𝑦 ∈ 𝑆))
14		oveq2 7413	. . . . . . . . . . . . . 14 ⊢ (𝑧 = 𝑦 → (𝑃𝐷𝑧) = (𝑃𝐷𝑦))
15	14	breq1d 5157	. . . . . . . . . . . . 13 ⊢ (𝑧 = 𝑦 → ((𝑃𝐷𝑧) ≤ 𝑅 ↔ (𝑃𝐷𝑦) ≤ 𝑅))
16		blcld.3	. . . . . . . . . . . . 13 ⊢ 𝑆 = {𝑧 ∈ 𝑋 ∣ (𝑃𝐷𝑧) ≤ 𝑅}
17	15, 16	elrab2 3685	. . . . . . . . . . . 12 ⊢ (𝑦 ∈ 𝑆 ↔ (𝑦 ∈ 𝑋 ∧ (𝑃𝐷𝑦) ≤ 𝑅))
18	17	simplbi2 501	. . . . . . . . . . 11 ⊢ (𝑦 ∈ 𝑋 → ((𝑃𝐷𝑦) ≤ 𝑅 → 𝑦 ∈ 𝑆))
19	18	con3dimp 409	. . . . . . . . . 10 ⊢ ((𝑦 ∈ 𝑋 ∧ ¬ 𝑦 ∈ 𝑆) → ¬ (𝑃𝐷𝑦) ≤ 𝑅)
20	13, 19	sylbi 216	. . . . . . . . 9 ⊢ (𝑦 ∈ (𝑋 ∖ 𝑆) → ¬ (𝑃𝐷𝑦) ≤ 𝑅)
21	20	adantl 482	. . . . . . . 8 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → ¬ (𝑃𝐷𝑦) ≤ 𝑅)
22		xrltnle 11277	. . . . . . . . 9 ⊢ ((𝑅 ∈ ℝ^* ∧ (𝑃𝐷𝑦) ∈ ℝ^*) → (𝑅 < (𝑃𝐷𝑦) ↔ ¬ (𝑃𝐷𝑦) ≤ 𝑅))
23	6, 12, 22	syl2anc 584	. . . . . . . 8 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → (𝑅 < (𝑃𝐷𝑦) ↔ ¬ (𝑃𝐷𝑦) ≤ 𝑅))
24	21, 23	mpbird 256	. . . . . . 7 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → 𝑅 < (𝑃𝐷𝑦))
25		qbtwnxr 13175	. . . . . . 7 ⊢ ((𝑅 ∈ ℝ^* ∧ (𝑃𝐷𝑦) ∈ ℝ^* ∧ 𝑅 < (𝑃𝐷𝑦)) → ∃𝑥 ∈ ℚ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))
26	6, 12, 24, 25	syl3anc 1371	. . . . . 6 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → ∃𝑥 ∈ ℚ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))
27		qre 12933	. . . . . . . 8 ⊢ (𝑥 ∈ ℚ → 𝑥 ∈ ℝ)
28	7	adantr 481	. . . . . . . . . . 11 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 𝐷 ∈ (∞Met‘𝑋))
29	10	adantr 481	. . . . . . . . . . 11 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 𝑦 ∈ 𝑋)
30	12	adantr 481	. . . . . . . . . . . 12 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → (𝑃𝐷𝑦) ∈ ℝ^)
31		rexr 11256	. . . . . . . . . . . . . 14 ⊢ (𝑥 ∈ ℝ → 𝑥 ∈ ℝ^*)
32	31	ad2antrl 726	. . . . . . . . . . . . 13 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 𝑥 ∈ ℝ^)
33	32	xnegcld 13275	. . . . . . . . . . . 12 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → -_𝑒𝑥 ∈ ℝ^)
34	30, 33	xaddcld 13276	. . . . . . . . . . 11 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥) ∈ ℝ^)
35		blelrn 23914	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑦 ∈ 𝑋 ∧ ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥) ∈ ℝ^*) → (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ∈ ran (ball‘𝐷))
36	28, 29, 34, 35	syl3anc 1371	. . . . . . . . . 10 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ∈ ran (ball‘𝐷))
37		simprrr 780	. . . . . . . . . . . 12 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 𝑥 < (𝑃𝐷𝑦))
38		xposdif 13237	. . . . . . . . . . . . 13 ⊢ ((𝑥 ∈ ℝ^* ∧ (𝑃𝐷𝑦) ∈ ℝ^*) → (𝑥 < (𝑃𝐷𝑦) ↔ 0 < ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)))
39	32, 30, 38	syl2anc 584	. . . . . . . . . . . 12 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → (𝑥 < (𝑃𝐷𝑦) ↔ 0 < ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)))
40	37, 39	mpbid 231	. . . . . . . . . . 11 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 0 < ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥))
41		xblcntr 23908	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑦 ∈ 𝑋 ∧ (((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥) ∈ ℝ^* ∧ 0 < ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥))) → 𝑦 ∈ (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)))
42	28, 29, 34, 40, 41	syl112anc 1374	. . . . . . . . . 10 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 𝑦 ∈ (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)))
43		incom 4200	. . . . . . . . . . . . 13 ⊢ ((𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ∩ (𝑃(ball‘𝐷)𝑥)) = ((𝑃(ball‘𝐷)𝑥) ∩ (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)))
44	8	adantr 481	. . . . . . . . . . . . . 14 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 𝑃 ∈ 𝑋)
45		xaddcom 13215	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑥 ∈ ℝ^* ∧ ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥) ∈ ℝ^*) → (𝑥 +_𝑒 ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) = (((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥) +_𝑒 𝑥))
46	32, 34, 45	syl2anc 584	. . . . . . . . . . . . . . . 16 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → (𝑥 +_𝑒 ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) = (((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥) +_𝑒 𝑥))
47		simprl 769	. . . . . . . . . . . . . . . . 17 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 𝑥 ∈ ℝ)
48		xnpcan 13227	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑃𝐷𝑦) ∈ ℝ^* ∧ 𝑥 ∈ ℝ) → (((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥) +_𝑒 𝑥) = (𝑃𝐷𝑦))
49	30, 47, 48	syl2anc 584	. . . . . . . . . . . . . . . 16 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → (((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥) +_𝑒 𝑥) = (𝑃𝐷𝑦))
50	46, 49	eqtrd 2772	. . . . . . . . . . . . . . 15 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → (𝑥 +_𝑒 ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) = (𝑃𝐷𝑦))
51	30	xrleidd 13127	. . . . . . . . . . . . . . 15 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → (𝑃𝐷𝑦) ≤ (𝑃𝐷𝑦))
52	50, 51	eqbrtrd 5169	. . . . . . . . . . . . . 14 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → (𝑥 +_𝑒 ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ≤ (𝑃𝐷𝑦))
53		bldisj 23895	. . . . . . . . . . . . . 14 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) ∧ (𝑥 ∈ ℝ^* ∧ ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥) ∈ ℝ^* ∧ (𝑥 +_𝑒 ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ≤ (𝑃𝐷𝑦))) → ((𝑃(ball‘𝐷)𝑥) ∩ (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥))) = ∅)
54	28, 44, 29, 32, 34, 52, 53	syl33anc 1385	. . . . . . . . . . . . 13 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → ((𝑃(ball‘𝐷)𝑥) ∩ (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥))) = ∅)
55	43, 54	eqtrid 2784	. . . . . . . . . . . 12 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → ((𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ∩ (𝑃(ball‘𝐷)𝑥)) = ∅)
56		blssm 23915	. . . . . . . . . . . . . 14 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑦 ∈ 𝑋 ∧ ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥) ∈ ℝ^*) → (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ⊆ 𝑋)
57	28, 29, 34, 56	syl3anc 1371	. . . . . . . . . . . . 13 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ⊆ 𝑋)
58		reldisj 4450	. . . . . . . . . . . . 13 ⊢ ((𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ⊆ 𝑋 → (((𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ∩ (𝑃(ball‘𝐷)𝑥)) = ∅ ↔ (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ⊆ (𝑋 ∖ (𝑃(ball‘𝐷)𝑥))))
59	57, 58	syl 17	. . . . . . . . . . . 12 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → (((𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ∩ (𝑃(ball‘𝐷)𝑥)) = ∅ ↔ (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ⊆ (𝑋 ∖ (𝑃(ball‘𝐷)𝑥))))
60	55, 59	mpbid 231	. . . . . . . . . . 11 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ⊆ (𝑋 ∖ (𝑃(ball‘𝐷)𝑥)))
61	6	adantr 481	. . . . . . . . . . . . 13 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 𝑅 ∈ ℝ^)
62		simprrl 779	. . . . . . . . . . . . 13 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 𝑅 < 𝑥)
63	1, 16	blsscls2 24004	. . . . . . . . . . . . 13 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑅 ∈ ℝ^* ∧ 𝑥 ∈ ℝ^* ∧ 𝑅 < 𝑥)) → 𝑆 ⊆ (𝑃(ball‘𝐷)𝑥))
64	28, 44, 61, 32, 62, 63	syl23anc 1377	. . . . . . . . . . . 12 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 𝑆 ⊆ (𝑃(ball‘𝐷)𝑥))
65	64	sscond 4140	. . . . . . . . . . 11 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → (𝑋 ∖ (𝑃(ball‘𝐷)𝑥)) ⊆ (𝑋 ∖ 𝑆))
66	60, 65	sstrd 3991	. . . . . . . . . 10 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ⊆ (𝑋 ∖ 𝑆))
67		eleq2 2822	. . . . . . . . . . . 12 ⊢ (𝑤 = (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) → (𝑦 ∈ 𝑤 ↔ 𝑦 ∈ (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥))))
68		sseq1 4006	. . . . . . . . . . . 12 ⊢ (𝑤 = (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) → (𝑤 ⊆ (𝑋 ∖ 𝑆) ↔ (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ⊆ (𝑋 ∖ 𝑆)))
69	67, 68	anbi12d 631	. . . . . . . . . . 11 ⊢ (𝑤 = (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) → ((𝑦 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑋 ∖ 𝑆)) ↔ (𝑦 ∈ (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ∧ (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ⊆ (𝑋 ∖ 𝑆))))
70	69	rspcev 3612	. . . . . . . . . 10 ⊢ (((𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ∈ ran (ball‘𝐷) ∧ (𝑦 ∈ (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ∧ (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ⊆ (𝑋 ∖ 𝑆))) → ∃𝑤 ∈ ran (ball‘𝐷)(𝑦 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑋 ∖ 𝑆)))
71	36, 42, 66, 70	syl12anc 835	. . . . . . . . 9 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → ∃𝑤 ∈ ran (ball‘𝐷)(𝑦 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑋 ∖ 𝑆)))
72	71	expr 457	. . . . . . . 8 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ 𝑥 ∈ ℝ) → ((𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)) → ∃𝑤 ∈ ran (ball‘𝐷)(𝑦 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑋 ∖ 𝑆))))
73	27, 72	sylan2 593	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ 𝑥 ∈ ℚ) → ((𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)) → ∃𝑤 ∈ ran (ball‘𝐷)(𝑦 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑋 ∖ 𝑆))))
74	73	rexlimdva 3155	. . . . . 6 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → (∃𝑥 ∈ ℚ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)) → ∃𝑤 ∈ ran (ball‘𝐷)(𝑦 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑋 ∖ 𝑆))))
75	26, 74	mpd 15	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → ∃𝑤 ∈ ran (ball‘𝐷)(𝑦 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑋 ∖ 𝑆)))
76	75	ralrimiva 3146	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → ∀𝑦 ∈ (𝑋 ∖ 𝑆)∃𝑤 ∈ ran (ball‘𝐷)(𝑦 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑋 ∖ 𝑆)))
77	1	elmopn 23939	. . . . 5 ⊢ (𝐷 ∈ (∞Met‘𝑋) → ((𝑋 ∖ 𝑆) ∈ 𝐽 ↔ ((𝑋 ∖ 𝑆) ⊆ 𝑋 ∧ ∀𝑦 ∈ (𝑋 ∖ 𝑆)∃𝑤 ∈ ran (ball‘𝐷)(𝑦 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑋 ∖ 𝑆)))))
78	77	3ad2ant1 1133	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → ((𝑋 ∖ 𝑆) ∈ 𝐽 ↔ ((𝑋 ∖ 𝑆) ⊆ 𝑋 ∧ ∀𝑦 ∈ (𝑋 ∖ 𝑆)∃𝑤 ∈ ran (ball‘𝐷)(𝑦 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑋 ∖ 𝑆)))))
79	5, 76, 78	mpbir2and 711	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → (𝑋 ∖ 𝑆) ∈ 𝐽)
80	4, 79	eqeltrrd 2834	. 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → (∪ 𝐽 ∖ 𝑆) ∈ 𝐽)
81	1	mopntop 23937	. . . 4 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝐽 ∈ Top)
82	81	3ad2ant1 1133	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → 𝐽 ∈ Top)
83	16	ssrab3 4079	. . . 4 ⊢ 𝑆 ⊆ 𝑋
84	83, 3	sseqtrid 4033	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → 𝑆 ⊆ ∪ 𝐽)
85		eqid 2732	. . . 4 ⊢ ∪ 𝐽 = ∪ 𝐽
86	85	iscld2 22523	. . 3 ⊢ ((𝐽 ∈ Top ∧ 𝑆 ⊆ ∪ 𝐽) → (𝑆 ∈ (Clsd‘𝐽) ↔ (∪ 𝐽 ∖ 𝑆) ∈ 𝐽))
87	82, 84, 86	syl2anc 584	. 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → (𝑆 ∈ (Clsd‘𝐽) ↔ (∪ 𝐽 ∖ 𝑆) ∈ 𝐽))
88	80, 87	mpbird 256	1 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → 𝑆 ∈ (Clsd‘𝐽))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 396 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ∀wral 3061 ∃wrex 3070 {crab 3432 ∖ cdif 3944 ∩ cin 3946 ⊆ wss 3947 ∅c0 4321 ∪ cuni 4907 class class class wbr 5147 ran crn 5676 ‘cfv 6540 (class class class)co 7405 ℝcr 11105 0cc0 11106 ℝ^*cxr 11243 < clt 11244 ≤ cle 11245 ℚcq 12928 -_𝑒cxne 13085 +_𝑒 cxad 13086 ∞Metcxmet 20921 ballcbl 20923 MetOpencmopn 20926 Topctop 22386 Clsdccld 22511

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183 ax-pre-sup 11184

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-op 4634 df-uni 4908 df-iun 4998 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-om 7852 df-1st 7971 df-2nd 7972 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-er 8699 df-map 8818 df-en 8936 df-dom 8937 df-sdom 8938 df-sup 9433 df-inf 9434 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-div 11868 df-nn 12209 df-2 12271 df-n0 12469 df-z 12555 df-uz 12819 df-q 12929 df-rp 12971 df-xneg 13088 df-xadd 13089 df-xmul 13090 df-topgen 17385 df-psmet 20928 df-xmet 20929 df-bl 20931 df-mopn 20932 df-top 22387 df-topon 22404 df-bases 22440 df-cld 22514

This theorem is referenced by: blcls 24006 lmle 24809 minveclem4 24940 lhop1lem 25521 ftalem3 26568 ubthlem1 30110

W3C validator