xblcntr - Metamath Proof Explorer

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Theorem xblcntr 24402

Description: A ball contains its center. (Contributed by NM, 2-Sep-2006.) (Revised by Mario Carneiro, 12-Nov-2013.)

**Assertion**
Ref	Expression
xblcntr	⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ (𝑅 ∈ ℝ^* ∧ 0 < 𝑅)) → 𝑃 ∈ (𝑃(ball‘𝐷)𝑅))

**Proof of Theorem xblcntr**
Step	Hyp	Ref	Expression
1		simp2 1134	. 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ (𝑅 ∈ ℝ^* ∧ 0 < 𝑅)) → 𝑃 ∈ 𝑋)
2		xmet0 24333	. . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) → (𝑃𝐷𝑃) = 0)
3	2	3adant3 1129	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ (𝑅 ∈ ℝ^* ∧ 0 < 𝑅)) → (𝑃𝐷𝑃) = 0)
4		simp3r 1199	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ (𝑅 ∈ ℝ^* ∧ 0 < 𝑅)) → 0 < 𝑅)
5	3, 4	eqbrtrd 5165	. 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ (𝑅 ∈ ℝ^* ∧ 0 < 𝑅)) → (𝑃𝐷𝑃) < 𝑅)
6		elbl 24379	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ^*) → (𝑃 ∈ (𝑃(ball‘𝐷)𝑅) ↔ (𝑃 ∈ 𝑋 ∧ (𝑃𝐷𝑃) < 𝑅)))
7	6	3adant3r 1178	. 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ (𝑅 ∈ ℝ^* ∧ 0 < 𝑅)) → (𝑃 ∈ (𝑃(ball‘𝐷)𝑅) ↔ (𝑃 ∈ 𝑋 ∧ (𝑃𝐷𝑃) < 𝑅)))
8	1, 5, 7	mpbir2and 711	1 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ (𝑅 ∈ ℝ^* ∧ 0 < 𝑅)) → 𝑃 ∈ (𝑃(ball‘𝐷)𝑅))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 394 ∧ w3a 1084 = wceq 1534 ∈ wcel 2099 class class class wbr 5143 ‘cfv 6543 (class class class)co 7413 0cc0 11146 ℝ^*cxr 11285 < clt 11286 ∞Metcxmet 21321 ballcbl 21323

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 2167 ax-ext 2697 ax-sep 5294 ax-nul 5301 ax-pow 5359 ax-pr 5423 ax-un 7735 ax-cnex 11202 ax-resscn 11203

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3an 1086 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2529 df-eu 2558 df-clab 2704 df-cleq 2718 df-clel 2803 df-nfc 2878 df-ne 2931 df-ral 3052 df-rex 3061 df-rab 3420 df-v 3464 df-sbc 3776 df-csb 3892 df-dif 3949 df-un 3951 df-in 3953 df-ss 3963 df-nul 4323 df-if 4524 df-pw 4599 df-sn 4624 df-pr 4626 df-op 4630 df-uni 4906 df-iun 4995 df-br 5144 df-opab 5206 df-mpt 5227 df-id 5570 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-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-fv 6551 df-ov 7416 df-oprab 7417 df-mpo 7418 df-1st 7992 df-2nd 7993 df-map 8846 df-xr 11290 df-psmet 21328 df-xmet 21329 df-bl 21331

This theorem is referenced by: blcntr 24404 xbln0 24405 blcld 24499 metds0 24851 metdseq0 24855 heicant 37366 qndenserrnbl 45949

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