ssbnd - Mathbox for Jeff Madsen

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Theorem ssbnd 37294

Description: A subset of a metric space is bounded iff it is contained in a ball around 𝑃, for any 𝑃 in the larger space. (Contributed by Mario Carneiro, 14-Sep-2015.)

**Hypothesis**
Ref	Expression
ssbnd.2	⊢ 𝑁 = (𝑀 ↾ (𝑌 × 𝑌))

**Assertion**
Ref	Expression
ssbnd	⊢ ((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) → (𝑁 ∈ (Bnd‘𝑌) ↔ ∃𝑑 ∈ ℝ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑)))

Distinct variable groups: 𝑀,𝑑 𝑁,𝑑 𝑃,𝑑 𝑋,𝑑 𝑌,𝑑

Proof of Theorem ssbnd Dummy variables 𝑟 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		0re 11254	. . . . . . 7 ⊢ 0 ∈ ℝ
2	1	ne0ii 4341	. . . . . 6 ⊢ ℝ ≠ ∅
3		0ss 4400	. . . . . . . 8 ⊢ ∅ ⊆ (𝑃(ball‘𝑀)𝑑)
4		sseq1 4007	. . . . . . . 8 ⊢ (𝑌 = ∅ → (𝑌 ⊆ (𝑃(ball‘𝑀)𝑑) ↔ ∅ ⊆ (𝑃(ball‘𝑀)𝑑)))
5	3, 4	mpbiri 257	. . . . . . 7 ⊢ (𝑌 = ∅ → 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑))
6	5	ralrimivw 3147	. . . . . 6 ⊢ (𝑌 = ∅ → ∀𝑑 ∈ ℝ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑))
7		r19.2z 4498	. . . . . 6 ⊢ ((ℝ ≠ ∅ ∧ ∀𝑑 ∈ ℝ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑)) → ∃𝑑 ∈ ℝ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑))
8	2, 6, 7	sylancr 585	. . . . 5 ⊢ (𝑌 = ∅ → ∃𝑑 ∈ ℝ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑))
9	8	a1i 11	. . . 4 ⊢ (((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (Bnd‘𝑌)) → (𝑌 = ∅ → ∃𝑑 ∈ ℝ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑)))
10		isbnd2 37289	. . . . . 6 ⊢ ((𝑁 ∈ (Bnd‘𝑌) ∧ 𝑌 ≠ ∅) ↔ (𝑁 ∈ (∞Met‘𝑌) ∧ ∃𝑦 ∈ 𝑌 ∃𝑟 ∈ ℝ⁺ 𝑌 = (𝑦(ball‘𝑁)𝑟)))
11		simplll 773	. . . . . . . . . . . 12 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → 𝑀 ∈ (Met‘𝑋))
12		ssbnd.2	. . . . . . . . . . . . . . . . . . . . 21 ⊢ 𝑁 = (𝑀 ↾ (𝑌 × 𝑌))
13	12	dmeqi 5911	. . . . . . . . . . . . . . . . . . . 20 ⊢ dom 𝑁 = dom (𝑀 ↾ (𝑌 × 𝑌))
14		dmres 6021	. . . . . . . . . . . . . . . . . . . 20 ⊢ dom (𝑀 ↾ (𝑌 × 𝑌)) = ((𝑌 × 𝑌) ∩ dom 𝑀)
15	13, 14	eqtri 2756	. . . . . . . . . . . . . . . . . . 19 ⊢ dom 𝑁 = ((𝑌 × 𝑌) ∩ dom 𝑀)
16		xmetf 24255	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑁 ∈ (∞Met‘𝑌) → 𝑁:(𝑌 × 𝑌)⟶ℝ^*)
17	16	fdmd 6738	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑁 ∈ (∞Met‘𝑌) → dom 𝑁 = (𝑌 × 𝑌))
18	15, 17	eqtr3id 2782	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑁 ∈ (∞Met‘𝑌) → ((𝑌 × 𝑌) ∩ dom 𝑀) = (𝑌 × 𝑌))
19		df-ss 3966	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑌 × 𝑌) ⊆ dom 𝑀 ↔ ((𝑌 × 𝑌) ∩ dom 𝑀) = (𝑌 × 𝑌))
20	18, 19	sylibr 233	. . . . . . . . . . . . . . . . 17 ⊢ (𝑁 ∈ (∞Met‘𝑌) → (𝑌 × 𝑌) ⊆ dom 𝑀)
21	20	ad2antlr 725	. . . . . . . . . . . . . . . 16 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → (𝑌 × 𝑌) ⊆ dom 𝑀)
22		metf 24256	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑀 ∈ (Met‘𝑋) → 𝑀:(𝑋 × 𝑋)⟶ℝ)
23	22	fdmd 6738	. . . . . . . . . . . . . . . . 17 ⊢ (𝑀 ∈ (Met‘𝑋) → dom 𝑀 = (𝑋 × 𝑋))
24	23	ad3antrrr 728	. . . . . . . . . . . . . . . 16 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → dom 𝑀 = (𝑋 × 𝑋))
25	21, 24	sseqtrd 4022	. . . . . . . . . . . . . . 15 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → (𝑌 × 𝑌) ⊆ (𝑋 × 𝑋))
26		dmss 5909	. . . . . . . . . . . . . . 15 ⊢ ((𝑌 × 𝑌) ⊆ (𝑋 × 𝑋) → dom (𝑌 × 𝑌) ⊆ dom (𝑋 × 𝑋))
27	25, 26	syl 17	. . . . . . . . . . . . . 14 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → dom (𝑌 × 𝑌) ⊆ dom (𝑋 × 𝑋))
28		dmxpid 5936	. . . . . . . . . . . . . 14 ⊢ dom (𝑌 × 𝑌) = 𝑌
29		dmxpid 5936	. . . . . . . . . . . . . 14 ⊢ dom (𝑋 × 𝑋) = 𝑋
30	27, 28, 29	3sstr3g 4026	. . . . . . . . . . . . 13 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → 𝑌 ⊆ 𝑋)
31		simprl 769	. . . . . . . . . . . . 13 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → 𝑦 ∈ 𝑌)
32	30, 31	sseldd 3983	. . . . . . . . . . . 12 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → 𝑦 ∈ 𝑋)
33		simpllr 774	. . . . . . . . . . . 12 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → 𝑃 ∈ 𝑋)
34		metcl 24258	. . . . . . . . . . . 12 ⊢ ((𝑀 ∈ (Met‘𝑋) ∧ 𝑦 ∈ 𝑋 ∧ 𝑃 ∈ 𝑋) → (𝑦𝑀𝑃) ∈ ℝ)
35	11, 32, 33, 34	syl3anc 1368	. . . . . . . . . . 11 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → (𝑦𝑀𝑃) ∈ ℝ)
36		rpre 13022	. . . . . . . . . . . 12 ⊢ (𝑟 ∈ ℝ⁺ → 𝑟 ∈ ℝ)
37	36	ad2antll 727	. . . . . . . . . . 11 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → 𝑟 ∈ ℝ)
38	35, 37	readdcld 11281	. . . . . . . . . 10 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → ((𝑦𝑀𝑃) + 𝑟) ∈ ℝ)
39		metxmet 24260	. . . . . . . . . . . . 13 ⊢ (𝑀 ∈ (Met‘𝑋) → 𝑀 ∈ (∞Met‘𝑋))
40	11, 39	syl 17	. . . . . . . . . . . 12 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → 𝑀 ∈ (∞Met‘𝑋))
41	32, 31	elind 4196	. . . . . . . . . . . 12 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → 𝑦 ∈ (𝑋 ∩ 𝑌))
42		rpxr 13023	. . . . . . . . . . . . 13 ⊢ (𝑟 ∈ ℝ⁺ → 𝑟 ∈ ℝ^*)
43	42	ad2antll 727	. . . . . . . . . . . 12 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → 𝑟 ∈ ℝ^*)
44	12	blres 24357	. . . . . . . . . . . 12 ⊢ ((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑦 ∈ (𝑋 ∩ 𝑌) ∧ 𝑟 ∈ ℝ^*) → (𝑦(ball‘𝑁)𝑟) = ((𝑦(ball‘𝑀)𝑟) ∩ 𝑌))
45	40, 41, 43, 44	syl3anc 1368	. . . . . . . . . . 11 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → (𝑦(ball‘𝑁)𝑟) = ((𝑦(ball‘𝑀)𝑟) ∩ 𝑌))
46		inss1 4231	. . . . . . . . . . . 12 ⊢ ((𝑦(ball‘𝑀)𝑟) ∩ 𝑌) ⊆ (𝑦(ball‘𝑀)𝑟)
47	35	leidd 11818	. . . . . . . . . . . . . 14 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → (𝑦𝑀𝑃) ≤ (𝑦𝑀𝑃))
48	35	recnd 11280	. . . . . . . . . . . . . . 15 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → (𝑦𝑀𝑃) ∈ ℂ)
49	37	recnd 11280	. . . . . . . . . . . . . . 15 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → 𝑟 ∈ ℂ)
50	48, 49	pncand 11610	. . . . . . . . . . . . . 14 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → (((𝑦𝑀𝑃) + 𝑟) − 𝑟) = (𝑦𝑀𝑃))
51	47, 50	breqtrrd 5180	. . . . . . . . . . . . 13 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → (𝑦𝑀𝑃) ≤ (((𝑦𝑀𝑃) + 𝑟) − 𝑟))
52		blss2 24330	. . . . . . . . . . . . 13 ⊢ (((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑦 ∈ 𝑋 ∧ 𝑃 ∈ 𝑋) ∧ (𝑟 ∈ ℝ ∧ ((𝑦𝑀𝑃) + 𝑟) ∈ ℝ ∧ (𝑦𝑀𝑃) ≤ (((𝑦𝑀𝑃) + 𝑟) − 𝑟))) → (𝑦(ball‘𝑀)𝑟) ⊆ (𝑃(ball‘𝑀)((𝑦𝑀𝑃) + 𝑟)))
53	40, 32, 33, 37, 38, 51, 52	syl33anc 1382	. . . . . . . . . . . 12 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → (𝑦(ball‘𝑀)𝑟) ⊆ (𝑃(ball‘𝑀)((𝑦𝑀𝑃) + 𝑟)))
54	46, 53	sstrid 3993	. . . . . . . . . . 11 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → ((𝑦(ball‘𝑀)𝑟) ∩ 𝑌) ⊆ (𝑃(ball‘𝑀)((𝑦𝑀𝑃) + 𝑟)))
55	45, 54	eqsstrd 4020	. . . . . . . . . 10 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → (𝑦(ball‘𝑁)𝑟) ⊆ (𝑃(ball‘𝑀)((𝑦𝑀𝑃) + 𝑟)))
56		oveq2 7434	. . . . . . . . . . . 12 ⊢ (𝑑 = ((𝑦𝑀𝑃) + 𝑟) → (𝑃(ball‘𝑀)𝑑) = (𝑃(ball‘𝑀)((𝑦𝑀𝑃) + 𝑟)))
57	56	sseq2d 4014	. . . . . . . . . . 11 ⊢ (𝑑 = ((𝑦𝑀𝑃) + 𝑟) → ((𝑦(ball‘𝑁)𝑟) ⊆ (𝑃(ball‘𝑀)𝑑) ↔ (𝑦(ball‘𝑁)𝑟) ⊆ (𝑃(ball‘𝑀)((𝑦𝑀𝑃) + 𝑟))))
58	57	rspcev 3611	. . . . . . . . . 10 ⊢ ((((𝑦𝑀𝑃) + 𝑟) ∈ ℝ ∧ (𝑦(ball‘𝑁)𝑟) ⊆ (𝑃(ball‘𝑀)((𝑦𝑀𝑃) + 𝑟))) → ∃𝑑 ∈ ℝ (𝑦(ball‘𝑁)𝑟) ⊆ (𝑃(ball‘𝑀)𝑑))
59	38, 55, 58	syl2anc 582	. . . . . . . . 9 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → ∃𝑑 ∈ ℝ (𝑦(ball‘𝑁)𝑟) ⊆ (𝑃(ball‘𝑀)𝑑))
60		sseq1 4007	. . . . . . . . . 10 ⊢ (𝑌 = (𝑦(ball‘𝑁)𝑟) → (𝑌 ⊆ (𝑃(ball‘𝑀)𝑑) ↔ (𝑦(ball‘𝑁)𝑟) ⊆ (𝑃(ball‘𝑀)𝑑)))
61	60	rexbidv 3176	. . . . . . . . 9 ⊢ (𝑌 = (𝑦(ball‘𝑁)𝑟) → (∃𝑑 ∈ ℝ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑) ↔ ∃𝑑 ∈ ℝ (𝑦(ball‘𝑁)𝑟) ⊆ (𝑃(ball‘𝑀)𝑑)))
62	59, 61	syl5ibrcom 246	. . . . . . . 8 ⊢ ((((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) ∧ (𝑦 ∈ 𝑌 ∧ 𝑟 ∈ ℝ⁺)) → (𝑌 = (𝑦(ball‘𝑁)𝑟) → ∃𝑑 ∈ ℝ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑)))
63	62	rexlimdvva 3209	. . . . . . 7 ⊢ (((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (∞Met‘𝑌)) → (∃𝑦 ∈ 𝑌 ∃𝑟 ∈ ℝ⁺ 𝑌 = (𝑦(ball‘𝑁)𝑟) → ∃𝑑 ∈ ℝ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑)))
64	63	expimpd 452	. . . . . 6 ⊢ ((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) → ((𝑁 ∈ (∞Met‘𝑌) ∧ ∃𝑦 ∈ 𝑌 ∃𝑟 ∈ ℝ⁺ 𝑌 = (𝑦(ball‘𝑁)𝑟)) → ∃𝑑 ∈ ℝ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑)))
65	10, 64	biimtrid 241	. . . . 5 ⊢ ((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) → ((𝑁 ∈ (Bnd‘𝑌) ∧ 𝑌 ≠ ∅) → ∃𝑑 ∈ ℝ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑)))
66	65	expdimp 451	. . . 4 ⊢ (((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (Bnd‘𝑌)) → (𝑌 ≠ ∅ → ∃𝑑 ∈ ℝ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑)))
67	9, 66	pm2.61dne 3025	. . 3 ⊢ (((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑁 ∈ (Bnd‘𝑌)) → ∃𝑑 ∈ ℝ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑))
68	67	ex 411	. 2 ⊢ ((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) → (𝑁 ∈ (Bnd‘𝑌) → ∃𝑑 ∈ ℝ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑)))
69		simprr 771	. . . . . . 7 ⊢ (((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑑 ∈ ℝ ∧ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑))) → 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑))
70		xpss12 5697	. . . . . . 7 ⊢ ((𝑌 ⊆ (𝑃(ball‘𝑀)𝑑) ∧ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑)) → (𝑌 × 𝑌) ⊆ ((𝑃(ball‘𝑀)𝑑) × (𝑃(ball‘𝑀)𝑑)))
71	69, 69, 70	syl2anc 582	. . . . . 6 ⊢ (((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑑 ∈ ℝ ∧ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑))) → (𝑌 × 𝑌) ⊆ ((𝑃(ball‘𝑀)𝑑) × (𝑃(ball‘𝑀)𝑑)))
72	71	resabs1d 6017	. . . . 5 ⊢ (((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑑 ∈ ℝ ∧ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑))) → ((𝑀 ↾ ((𝑃(ball‘𝑀)𝑑) × (𝑃(ball‘𝑀)𝑑))) ↾ (𝑌 × 𝑌)) = (𝑀 ↾ (𝑌 × 𝑌)))
73	72, 12	eqtr4di 2786	. . . 4 ⊢ (((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑑 ∈ ℝ ∧ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑))) → ((𝑀 ↾ ((𝑃(ball‘𝑀)𝑑) × (𝑃(ball‘𝑀)𝑑))) ↾ (𝑌 × 𝑌)) = 𝑁)
74		blbnd 37293	. . . . . . . 8 ⊢ ((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑑 ∈ ℝ) → (𝑀 ↾ ((𝑃(ball‘𝑀)𝑑) × (𝑃(ball‘𝑀)𝑑))) ∈ (Bnd‘(𝑃(ball‘𝑀)𝑑)))
75	39, 74	syl3an1 1160	. . . . . . 7 ⊢ ((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑑 ∈ ℝ) → (𝑀 ↾ ((𝑃(ball‘𝑀)𝑑) × (𝑃(ball‘𝑀)𝑑))) ∈ (Bnd‘(𝑃(ball‘𝑀)𝑑)))
76	75	3expa 1115	. . . . . 6 ⊢ (((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝑑 ∈ ℝ) → (𝑀 ↾ ((𝑃(ball‘𝑀)𝑑) × (𝑃(ball‘𝑀)𝑑))) ∈ (Bnd‘(𝑃(ball‘𝑀)𝑑)))
77	76	adantrr 715	. . . . 5 ⊢ (((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑑 ∈ ℝ ∧ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑))) → (𝑀 ↾ ((𝑃(ball‘𝑀)𝑑) × (𝑃(ball‘𝑀)𝑑))) ∈ (Bnd‘(𝑃(ball‘𝑀)𝑑)))
78		bndss 37292	. . . . 5 ⊢ (((𝑀 ↾ ((𝑃(ball‘𝑀)𝑑) × (𝑃(ball‘𝑀)𝑑))) ∈ (Bnd‘(𝑃(ball‘𝑀)𝑑)) ∧ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑)) → ((𝑀 ↾ ((𝑃(ball‘𝑀)𝑑) × (𝑃(ball‘𝑀)𝑑))) ↾ (𝑌 × 𝑌)) ∈ (Bnd‘𝑌))
79	77, 69, 78	syl2anc 582	. . . 4 ⊢ (((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑑 ∈ ℝ ∧ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑))) → ((𝑀 ↾ ((𝑃(ball‘𝑀)𝑑) × (𝑃(ball‘𝑀)𝑑))) ↾ (𝑌 × 𝑌)) ∈ (Bnd‘𝑌))
80	73, 79	eqeltrrd 2830	. . 3 ⊢ (((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑑 ∈ ℝ ∧ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑))) → 𝑁 ∈ (Bnd‘𝑌))
81	80	rexlimdvaa 3153	. 2 ⊢ ((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) → (∃𝑑 ∈ ℝ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑) → 𝑁 ∈ (Bnd‘𝑌)))
82	68, 81	impbid 211	1 ⊢ ((𝑀 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋) → (𝑁 ∈ (Bnd‘𝑌) ↔ ∃𝑑 ∈ ℝ 𝑌 ⊆ (𝑃(ball‘𝑀)𝑑)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 394 = wceq 1533 ∈ wcel 2098 ≠ wne 2937 ∀wral 3058 ∃wrex 3067 ∩ cin 3948 ⊆ wss 3949 ∅c0 4326 class class class wbr 5152 × cxp 5680 dom cdm 5682 ↾ cres 5684 ‘cfv 6553 (class class class)co 7426 ℝcr 11145 0cc0 11146 + caddc 11149 ℝ^*cxr 11285 ≤ cle 11287 − cmin 11482 ℝ⁺crp 13014 ∞Metcxmet 21271 Metcmet 21272 ballcbl 21273 Bndcbnd 37273

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 2699 ax-sep 5303 ax-nul 5310 ax-pow 5369 ax-pr 5433 ax-un 7746 ax-cnex 11202 ax-resscn 11203 ax-1cn 11204 ax-icn 11205 ax-addcl 11206 ax-addrcl 11207 ax-mulcl 11208 ax-mulrcl 11209 ax-mulcom 11210 ax-addass 11211 ax-mulass 11212 ax-distr 11213 ax-i2m1 11214 ax-1ne0 11215 ax-1rid 11216 ax-rnegex 11217 ax-rrecex 11218 ax-cnre 11219 ax-pre-lttri 11220 ax-pre-lttrn 11221 ax-pre-ltadd 11222 ax-pre-mulgt0 11223

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 2529 df-eu 2558 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3374 df-reu 3375 df-rab 3431 df-v 3475 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-nul 4327 df-if 4533 df-pw 4608 df-sn 4633 df-pr 4635 df-op 4639 df-uni 4913 df-iun 5002 df-br 5153 df-opab 5215 df-mpt 5236 df-id 5580 df-po 5594 df-so 5595 df-xp 5688 df-rel 5689 df-cnv 5690 df-co 5691 df-dm 5692 df-rn 5693 df-res 5694 df-ima 5695 df-iota 6505 df-fun 6555 df-fn 6556 df-f 6557 df-f1 6558 df-fo 6559 df-f1o 6560 df-fv 6561 df-riota 7382 df-ov 7429 df-oprab 7430 df-mpo 7431 df-1st 7999 df-2nd 8000 df-er 8731 df-ec 8733 df-map 8853 df-en 8971 df-dom 8972 df-sdom 8973 df-pnf 11288 df-mnf 11289 df-xr 11290 df-ltxr 11291 df-le 11292 df-sub 11484 df-neg 11485 df-div 11910 df-2 12313 df-rp 13015 df-xneg 13132 df-xadd 13133 df-xmul 13134 df-psmet 21278 df-xmet 21279 df-met 21280 df-bl 21281 df-bnd 37285

This theorem is referenced by: prdsbnd2 37301 cntotbnd 37302

W3C validator