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Theorem blcld 24014

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 23947	. . . . 5 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝑋 = ∪ 𝐽)
3	2	3ad2ant1 1134	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → 𝑋 = ∪ 𝐽)
4	3	difeq1d 4122	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → (𝑋 ∖ 𝑆) = (∪ 𝐽 ∖ 𝑆))
5		difssd 4133	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → (𝑋 ∖ 𝑆) ⊆ 𝑋)
6		simpl3 1194	. . . . . . 7 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → 𝑅 ∈ ℝ^)
7		simpl1 1192	. . . . . . . 8 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → 𝐷 ∈ (∞Met‘𝑋))
8		simpl2 1193	. . . . . . . 8 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → 𝑃 ∈ 𝑋)
9		eldifi 4127	. . . . . . . . 9 ⊢ (𝑦 ∈ (𝑋 ∖ 𝑆) → 𝑦 ∈ 𝑋)
10	9	adantl 483	. . . . . . . 8 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → 𝑦 ∈ 𝑋)
11		xmetcl 23837	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) → (𝑃𝐷𝑦) ∈ ℝ^*)
12	7, 8, 10, 11	syl3anc 1372	. . . . . . 7 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → (𝑃𝐷𝑦) ∈ ℝ^)
13		eldif 3959	. . . . . . . . . 10 ⊢ (𝑦 ∈ (𝑋 ∖ 𝑆) ↔ (𝑦 ∈ 𝑋 ∧ ¬ 𝑦 ∈ 𝑆))
14		oveq2 7417	. . . . . . . . . . . . . 14 ⊢ (𝑧 = 𝑦 → (𝑃𝐷𝑧) = (𝑃𝐷𝑦))
15	14	breq1d 5159	. . . . . . . . . . . . 13 ⊢ (𝑧 = 𝑦 → ((𝑃𝐷𝑧) ≤ 𝑅 ↔ (𝑃𝐷𝑦) ≤ 𝑅))
16		blcld.3	. . . . . . . . . . . . 13 ⊢ 𝑆 = {𝑧 ∈ 𝑋 ∣ (𝑃𝐷𝑧) ≤ 𝑅}
17	15, 16	elrab2 3687	. . . . . . . . . . . 12 ⊢ (𝑦 ∈ 𝑆 ↔ (𝑦 ∈ 𝑋 ∧ (𝑃𝐷𝑦) ≤ 𝑅))
18	17	simplbi2 502	. . . . . . . . . . 11 ⊢ (𝑦 ∈ 𝑋 → ((𝑃𝐷𝑦) ≤ 𝑅 → 𝑦 ∈ 𝑆))
19	18	con3dimp 410	. . . . . . . . . 10 ⊢ ((𝑦 ∈ 𝑋 ∧ ¬ 𝑦 ∈ 𝑆) → ¬ (𝑃𝐷𝑦) ≤ 𝑅)
20	13, 19	sylbi 216	. . . . . . . . 9 ⊢ (𝑦 ∈ (𝑋 ∖ 𝑆) → ¬ (𝑃𝐷𝑦) ≤ 𝑅)
21	20	adantl 483	. . . . . . . 8 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → ¬ (𝑃𝐷𝑦) ≤ 𝑅)
22		xrltnle 11281	. . . . . . . . 9 ⊢ ((𝑅 ∈ ℝ^* ∧ (𝑃𝐷𝑦) ∈ ℝ^*) → (𝑅 < (𝑃𝐷𝑦) ↔ ¬ (𝑃𝐷𝑦) ≤ 𝑅))
23	6, 12, 22	syl2anc 585	. . . . . . . 8 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → (𝑅 < (𝑃𝐷𝑦) ↔ ¬ (𝑃𝐷𝑦) ≤ 𝑅))
24	21, 23	mpbird 257	. . . . . . 7 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → 𝑅 < (𝑃𝐷𝑦))
25		qbtwnxr 13179	. . . . . . 7 ⊢ ((𝑅 ∈ ℝ^* ∧ (𝑃𝐷𝑦) ∈ ℝ^* ∧ 𝑅 < (𝑃𝐷𝑦)) → ∃𝑥 ∈ ℚ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))
26	6, 12, 24, 25	syl3anc 1372	. . . . . 6 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) → ∃𝑥 ∈ ℚ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))
27		qre 12937	. . . . . . . 8 ⊢ (𝑥 ∈ ℚ → 𝑥 ∈ ℝ)
28	7	adantr 482	. . . . . . . . . . 11 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 𝐷 ∈ (∞Met‘𝑋))
29	10	adantr 482	. . . . . . . . . . 11 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 𝑦 ∈ 𝑋)
30	12	adantr 482	. . . . . . . . . . . 12 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → (𝑃𝐷𝑦) ∈ ℝ^)
31		rexr 11260	. . . . . . . . . . . . . 14 ⊢ (𝑥 ∈ ℝ → 𝑥 ∈ ℝ^*)
32	31	ad2antrl 727	. . . . . . . . . . . . 13 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 𝑥 ∈ ℝ^)
33	32	xnegcld 13279	. . . . . . . . . . . 12 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → -_𝑒𝑥 ∈ ℝ^)
34	30, 33	xaddcld 13280	. . . . . . . . . . 11 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥) ∈ ℝ^)
35		blelrn 23923	. . . . . . . . . . 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 1372	. . . . . . . . . 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 781	. . . . . . . . . . . 12 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 𝑥 < (𝑃𝐷𝑦))
38		xposdif 13241	. . . . . . . . . . . . 13 ⊢ ((𝑥 ∈ ℝ^* ∧ (𝑃𝐷𝑦) ∈ ℝ^*) → (𝑥 < (𝑃𝐷𝑦) ↔ 0 < ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)))
39	32, 30, 38	syl2anc 585	. . . . . . . . . . . 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 23917	. . . . . . . . . . 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 1375	. . . . . . . . . 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 4202	. . . . . . . . . . . . 13 ⊢ ((𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ∩ (𝑃(ball‘𝐷)𝑥)) = ((𝑃(ball‘𝐷)𝑥) ∩ (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)))
44	8	adantr 482	. . . . . . . . . . . . . 14 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 𝑃 ∈ 𝑋)
45		xaddcom 13219	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑥 ∈ ℝ^* ∧ ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥) ∈ ℝ^*) → (𝑥 +_𝑒 ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) = (((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥) +_𝑒 𝑥))
46	32, 34, 45	syl2anc 585	. . . . . . . . . . . . . . . 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 770	. . . . . . . . . . . . . . . . 17 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 𝑥 ∈ ℝ)
48		xnpcan 13231	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑃𝐷𝑦) ∈ ℝ^* ∧ 𝑥 ∈ ℝ) → (((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥) +_𝑒 𝑥) = (𝑃𝐷𝑦))
49	30, 47, 48	syl2anc 585	. . . . . . . . . . . . . . . 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 2773	. . . . . . . . . . . . . . 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 13131	. . . . . . . . . . . . . . 15 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → (𝑃𝐷𝑦) ≤ (𝑃𝐷𝑦))
52	50, 51	eqbrtrd 5171	. . . . . . . . . . . . . 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 23904	. . . . . . . . . . . . . 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 1386	. . . . . . . . . . . . 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 2785	. . . . . . . . . . . 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 23924	. . . . . . . . . . . . . 14 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑦 ∈ 𝑋 ∧ ((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥) ∈ ℝ^*) → (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ⊆ 𝑋)
57	28, 29, 34, 56	syl3anc 1372	. . . . . . . . . . . . 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 4452	. . . . . . . . . . . . 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 482	. . . . . . . . . . . . 13 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 𝑅 ∈ ℝ^)
62		simprrl 780	. . . . . . . . . . . . 13 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) ∧ 𝑦 ∈ (𝑋 ∖ 𝑆)) ∧ (𝑥 ∈ ℝ ∧ (𝑅 < 𝑥 ∧ 𝑥 < (𝑃𝐷𝑦)))) → 𝑅 < 𝑥)
63	1, 16	blsscls2 24013	. . . . . . . . . . . . 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 1378	. . . . . . . . . . . 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 4142	. . . . . . . . . . 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 3993	. . . . . . . . . 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 2823	. . . . . . . . . . . 12 ⊢ (𝑤 = (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) → (𝑦 ∈ 𝑤 ↔ 𝑦 ∈ (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥))))
68		sseq1 4008	. . . . . . . . . . . 12 ⊢ (𝑤 = (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) → (𝑤 ⊆ (𝑋 ∖ 𝑆) ↔ (𝑦(ball‘𝐷)((𝑃𝐷𝑦) +_𝑒 -_𝑒𝑥)) ⊆ (𝑋 ∖ 𝑆)))
69	67, 68	anbi12d 632	. . . . . . . . . . 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 3613	. . . . . . . . . 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 836	. . . . . . . . 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 458	. . . . . . . 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 594	. . . . . . 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 3156	. . . . . 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 3147	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → ∀𝑦 ∈ (𝑋 ∖ 𝑆)∃𝑤 ∈ ran (ball‘𝐷)(𝑦 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑋 ∖ 𝑆)))
77	1	elmopn 23948	. . . . 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 1134	. . . 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 712	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → (𝑋 ∖ 𝑆) ∈ 𝐽)
80	4, 79	eqeltrrd 2835	. 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → (∪ 𝐽 ∖ 𝑆) ∈ 𝐽)
81	1	mopntop 23946	. . . 4 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝐽 ∈ Top)
82	81	3ad2ant1 1134	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → 𝐽 ∈ Top)
83	16	ssrab3 4081	. . . 4 ⊢ 𝑆 ⊆ 𝑋
84	83, 3	sseqtrid 4035	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → 𝑆 ⊆ ∪ 𝐽)
85		eqid 2733	. . . 4 ⊢ ∪ 𝐽 = ∪ 𝐽
86	85	iscld2 22532	. . 3 ⊢ ((𝐽 ∈ Top ∧ 𝑆 ⊆ ∪ 𝐽) → (𝑆 ∈ (Clsd‘𝐽) ↔ (∪ 𝐽 ∖ 𝑆) ∈ 𝐽))
87	82, 84, 86	syl2anc 585	. 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → (𝑆 ∈ (Clsd‘𝐽) ↔ (∪ 𝐽 ∖ 𝑆) ∈ 𝐽))
88	80, 87	mpbird 257	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 397 ∧ w3a 1088 = wceq 1542 ∈ wcel 2107 ∀wral 3062 ∃wrex 3071 {crab 3433 ∖ cdif 3946 ∩ cin 3948 ⊆ wss 3949 ∅c0 4323 ∪ cuni 4909 class class class wbr 5149 ran crn 5678 ‘cfv 6544 (class class class)co 7409 ℝcr 11109 0cc0 11110 ℝ^*cxr 11247 < clt 11248 ≤ cle 11249 ℚcq 12932 -_𝑒cxne 13089 +_𝑒 cxad 13090 ∞Metcxmet 20929 ballcbl 20931 MetOpencmopn 20934 Topctop 22395 Clsdccld 22520

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 ax-cnex 11166 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186 ax-pre-mulgt0 11187 ax-pre-sup 11188

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 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 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-riota 7365 df-ov 7412 df-oprab 7413 df-mpo 7414 df-om 7856 df-1st 7975 df-2nd 7976 df-frecs 8266 df-wrecs 8297 df-recs 8371 df-rdg 8410 df-er 8703 df-map 8822 df-en 8940 df-dom 8941 df-sdom 8942 df-sup 9437 df-inf 9438 df-pnf 11250 df-mnf 11251 df-xr 11252 df-ltxr 11253 df-le 11254 df-sub 11446 df-neg 11447 df-div 11872 df-nn 12213 df-2 12275 df-n0 12473 df-z 12559 df-uz 12823 df-q 12933 df-rp 12975 df-xneg 13092 df-xadd 13093 df-xmul 13094 df-topgen 17389 df-psmet 20936 df-xmet 20937 df-bl 20939 df-mopn 20940 df-top 22396 df-topon 22413 df-bases 22449 df-cld 22523

This theorem is referenced by: blcls 24015 lmle 24818 minveclem4 24949 lhop1lem 25530 ftalem3 26579 ubthlem1 30123

W3C validator