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Mirrors > Home > MPE Home > Th. List > elbl | Structured version Visualization version GIF version |
Description: Membership in a ball. (Contributed by NM, 2-Sep-2006.) (Revised by Mario Carneiro, 11-Nov-2013.) |
Ref | Expression |
---|---|
elbl | ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ*) → (𝐴 ∈ (𝑃(ball‘𝐷)𝑅) ↔ (𝐴 ∈ 𝑋 ∧ (𝑃𝐷𝐴) < 𝑅))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | blval 23152 | . . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ*) → (𝑃(ball‘𝐷)𝑅) = {𝑥 ∈ 𝑋 ∣ (𝑃𝐷𝑥) < 𝑅}) | |
2 | 1 | eleq2d 2819 | . 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ*) → (𝐴 ∈ (𝑃(ball‘𝐷)𝑅) ↔ 𝐴 ∈ {𝑥 ∈ 𝑋 ∣ (𝑃𝐷𝑥) < 𝑅})) |
3 | oveq2 7191 | . . . 4 ⊢ (𝑥 = 𝐴 → (𝑃𝐷𝑥) = (𝑃𝐷𝐴)) | |
4 | 3 | breq1d 5050 | . . 3 ⊢ (𝑥 = 𝐴 → ((𝑃𝐷𝑥) < 𝑅 ↔ (𝑃𝐷𝐴) < 𝑅)) |
5 | 4 | elrab 3593 | . 2 ⊢ (𝐴 ∈ {𝑥 ∈ 𝑋 ∣ (𝑃𝐷𝑥) < 𝑅} ↔ (𝐴 ∈ 𝑋 ∧ (𝑃𝐷𝐴) < 𝑅)) |
6 | 2, 5 | bitrdi 290 | 1 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑅 ∈ ℝ*) → (𝐴 ∈ (𝑃(ball‘𝐷)𝑅) ↔ (𝐴 ∈ 𝑋 ∧ (𝑃𝐷𝐴) < 𝑅))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∧ wa 399 ∧ w3a 1088 = wceq 1542 ∈ wcel 2114 {crab 3058 class class class wbr 5040 ‘cfv 6350 (class class class)co 7183 ℝ*cxr 10765 < clt 10766 ∞Metcxmet 20215 ballcbl 20217 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1975 ax-7 2020 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2162 ax-12 2179 ax-ext 2711 ax-sep 5177 ax-nul 5184 ax-pow 5242 ax-pr 5306 ax-un 7492 ax-cnex 10684 ax-resscn 10685 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 847 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1787 df-nf 1791 df-sb 2075 df-mo 2541 df-eu 2571 df-clab 2718 df-cleq 2731 df-clel 2812 df-nfc 2882 df-ne 2936 df-ral 3059 df-rex 3060 df-rab 3063 df-v 3402 df-sbc 3686 df-csb 3801 df-dif 3856 df-un 3858 df-in 3860 df-ss 3870 df-nul 4222 df-if 4425 df-pw 4500 df-sn 4527 df-pr 4529 df-op 4533 df-uni 4807 df-iun 4893 df-br 5041 df-opab 5103 df-mpt 5121 df-id 5439 df-xp 5541 df-rel 5542 df-cnv 5543 df-co 5544 df-dm 5545 df-rn 5546 df-res 5547 df-ima 5548 df-iota 6308 df-fun 6352 df-fn 6353 df-f 6354 df-fv 6358 df-ov 7186 df-oprab 7187 df-mpo 7188 df-1st 7727 df-2nd 7728 df-map 8452 df-xr 10770 df-psmet 20222 df-xmet 20223 df-bl 20225 |
This theorem is referenced by: elbl2 23156 xblpnf 23162 bldisj 23164 blgt0 23165 xblss2 23168 blhalf 23171 xblcntr 23177 xbln0 23180 blin 23187 blss 23191 blres 23197 imasf1obl 23254 prdsbl 23257 blcls 23272 metcnp 23307 dscopn 23339 cnbl0 23539 bl2ioo 23557 blcvx 23563 xrsmopn 23577 recld2 23579 cnheibor 23720 nmhmcn 23885 lmmbr2 24024 iscau2 24042 dvlip2 24760 psercn 25186 abelth 25201 logtayl 25416 logtayl2 25418 poimirlem29 35462 heicant 35468 iooabslt 42618 limcrecl 42753 islpcn 42763 qndenserrnbllem 43418 |
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