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Mirrors > Home > MPE Home > Th. List > xrsblre | Structured version Visualization version GIF version |
Description: Any ball of the metric of the extended reals centered on an element of ℝ is entirely contained in ℝ. (Contributed by Mario Carneiro, 4-Sep-2015.) |
Ref | Expression |
---|---|
xrsxmet.1 | ⊢ 𝐷 = (dist‘ℝ*𝑠) |
Ref | Expression |
---|---|
xrsblre | ⊢ ((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) → (𝑃(ball‘𝐷)𝑅) ⊆ ℝ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rexr 11021 | . . 3 ⊢ (𝑃 ∈ ℝ → 𝑃 ∈ ℝ*) | |
2 | xrsxmet.1 | . . . . 5 ⊢ 𝐷 = (dist‘ℝ*𝑠) | |
3 | 2 | xrsxmet 23972 | . . . 4 ⊢ 𝐷 ∈ (∞Met‘ℝ*) |
4 | eqid 2738 | . . . . 5 ⊢ (◡𝐷 “ ℝ) = (◡𝐷 “ ℝ) | |
5 | 4 | blssec 23588 | . . . 4 ⊢ ((𝐷 ∈ (∞Met‘ℝ*) ∧ 𝑃 ∈ ℝ* ∧ 𝑅 ∈ ℝ*) → (𝑃(ball‘𝐷)𝑅) ⊆ [𝑃](◡𝐷 “ ℝ)) |
6 | 3, 5 | mp3an1 1447 | . . 3 ⊢ ((𝑃 ∈ ℝ* ∧ 𝑅 ∈ ℝ*) → (𝑃(ball‘𝐷)𝑅) ⊆ [𝑃](◡𝐷 “ ℝ)) |
7 | 1, 6 | sylan 580 | . 2 ⊢ ((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) → (𝑃(ball‘𝐷)𝑅) ⊆ [𝑃](◡𝐷 “ ℝ)) |
8 | vex 3436 | . . . . 5 ⊢ 𝑥 ∈ V | |
9 | simpl 483 | . . . . 5 ⊢ ((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) → 𝑃 ∈ ℝ) | |
10 | elecg 8541 | . . . . 5 ⊢ ((𝑥 ∈ V ∧ 𝑃 ∈ ℝ) → (𝑥 ∈ [𝑃](◡𝐷 “ ℝ) ↔ 𝑃(◡𝐷 “ ℝ)𝑥)) | |
11 | 8, 9, 10 | sylancr 587 | . . . 4 ⊢ ((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) → (𝑥 ∈ [𝑃](◡𝐷 “ ℝ) ↔ 𝑃(◡𝐷 “ ℝ)𝑥)) |
12 | 4 | xmeterval 23585 | . . . . . 6 ⊢ (𝐷 ∈ (∞Met‘ℝ*) → (𝑃(◡𝐷 “ ℝ)𝑥 ↔ (𝑃 ∈ ℝ* ∧ 𝑥 ∈ ℝ* ∧ (𝑃𝐷𝑥) ∈ ℝ))) |
13 | 3, 12 | ax-mp 5 | . . . . 5 ⊢ (𝑃(◡𝐷 “ ℝ)𝑥 ↔ (𝑃 ∈ ℝ* ∧ 𝑥 ∈ ℝ* ∧ (𝑃𝐷𝑥) ∈ ℝ)) |
14 | simpr 485 | . . . . . . . 8 ⊢ ((((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) ∧ (𝑃 ∈ ℝ* ∧ 𝑥 ∈ ℝ* ∧ (𝑃𝐷𝑥) ∈ ℝ)) ∧ 𝑃 = 𝑥) → 𝑃 = 𝑥) | |
15 | simplll 772 | . . . . . . . 8 ⊢ ((((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) ∧ (𝑃 ∈ ℝ* ∧ 𝑥 ∈ ℝ* ∧ (𝑃𝐷𝑥) ∈ ℝ)) ∧ 𝑃 = 𝑥) → 𝑃 ∈ ℝ) | |
16 | 14, 15 | eqeltrrd 2840 | . . . . . . 7 ⊢ ((((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) ∧ (𝑃 ∈ ℝ* ∧ 𝑥 ∈ ℝ* ∧ (𝑃𝐷𝑥) ∈ ℝ)) ∧ 𝑃 = 𝑥) → 𝑥 ∈ ℝ) |
17 | simplr3 1216 | . . . . . . . . 9 ⊢ ((((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) ∧ (𝑃 ∈ ℝ* ∧ 𝑥 ∈ ℝ* ∧ (𝑃𝐷𝑥) ∈ ℝ)) ∧ 𝑃 ≠ 𝑥) → (𝑃𝐷𝑥) ∈ ℝ) | |
18 | simplr1 1214 | . . . . . . . . . 10 ⊢ ((((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) ∧ (𝑃 ∈ ℝ* ∧ 𝑥 ∈ ℝ* ∧ (𝑃𝐷𝑥) ∈ ℝ)) ∧ 𝑃 ≠ 𝑥) → 𝑃 ∈ ℝ*) | |
19 | simplr2 1215 | . . . . . . . . . 10 ⊢ ((((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) ∧ (𝑃 ∈ ℝ* ∧ 𝑥 ∈ ℝ* ∧ (𝑃𝐷𝑥) ∈ ℝ)) ∧ 𝑃 ≠ 𝑥) → 𝑥 ∈ ℝ*) | |
20 | simpr 485 | . . . . . . . . . 10 ⊢ ((((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) ∧ (𝑃 ∈ ℝ* ∧ 𝑥 ∈ ℝ* ∧ (𝑃𝐷𝑥) ∈ ℝ)) ∧ 𝑃 ≠ 𝑥) → 𝑃 ≠ 𝑥) | |
21 | 2 | xrsdsreclb 20645 | . . . . . . . . . 10 ⊢ ((𝑃 ∈ ℝ* ∧ 𝑥 ∈ ℝ* ∧ 𝑃 ≠ 𝑥) → ((𝑃𝐷𝑥) ∈ ℝ ↔ (𝑃 ∈ ℝ ∧ 𝑥 ∈ ℝ))) |
22 | 18, 19, 20, 21 | syl3anc 1370 | . . . . . . . . 9 ⊢ ((((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) ∧ (𝑃 ∈ ℝ* ∧ 𝑥 ∈ ℝ* ∧ (𝑃𝐷𝑥) ∈ ℝ)) ∧ 𝑃 ≠ 𝑥) → ((𝑃𝐷𝑥) ∈ ℝ ↔ (𝑃 ∈ ℝ ∧ 𝑥 ∈ ℝ))) |
23 | 17, 22 | mpbid 231 | . . . . . . . 8 ⊢ ((((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) ∧ (𝑃 ∈ ℝ* ∧ 𝑥 ∈ ℝ* ∧ (𝑃𝐷𝑥) ∈ ℝ)) ∧ 𝑃 ≠ 𝑥) → (𝑃 ∈ ℝ ∧ 𝑥 ∈ ℝ)) |
24 | 23 | simprd 496 | . . . . . . 7 ⊢ ((((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) ∧ (𝑃 ∈ ℝ* ∧ 𝑥 ∈ ℝ* ∧ (𝑃𝐷𝑥) ∈ ℝ)) ∧ 𝑃 ≠ 𝑥) → 𝑥 ∈ ℝ) |
25 | 16, 24 | pm2.61dane 3032 | . . . . . 6 ⊢ (((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) ∧ (𝑃 ∈ ℝ* ∧ 𝑥 ∈ ℝ* ∧ (𝑃𝐷𝑥) ∈ ℝ)) → 𝑥 ∈ ℝ) |
26 | 25 | ex 413 | . . . . 5 ⊢ ((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) → ((𝑃 ∈ ℝ* ∧ 𝑥 ∈ ℝ* ∧ (𝑃𝐷𝑥) ∈ ℝ) → 𝑥 ∈ ℝ)) |
27 | 13, 26 | syl5bi 241 | . . . 4 ⊢ ((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) → (𝑃(◡𝐷 “ ℝ)𝑥 → 𝑥 ∈ ℝ)) |
28 | 11, 27 | sylbid 239 | . . 3 ⊢ ((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) → (𝑥 ∈ [𝑃](◡𝐷 “ ℝ) → 𝑥 ∈ ℝ)) |
29 | 28 | ssrdv 3927 | . 2 ⊢ ((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) → [𝑃](◡𝐷 “ ℝ) ⊆ ℝ) |
30 | 7, 29 | sstrd 3931 | 1 ⊢ ((𝑃 ∈ ℝ ∧ 𝑅 ∈ ℝ*) → (𝑃(ball‘𝐷)𝑅) ⊆ ℝ) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∧ w3a 1086 = wceq 1539 ∈ wcel 2106 ≠ wne 2943 Vcvv 3432 ⊆ wss 3887 class class class wbr 5074 ◡ccnv 5588 “ cima 5592 ‘cfv 6433 (class class class)co 7275 [cec 8496 ℝcr 10870 ℝ*cxr 11008 distcds 16971 ℝ*𝑠cxrs 17211 ∞Metcxmet 20582 ballcbl 20584 |
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 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 ax-cnex 10927 ax-resscn 10928 ax-1cn 10929 ax-icn 10930 ax-addcl 10931 ax-addrcl 10932 ax-mulcl 10933 ax-mulrcl 10934 ax-mulcom 10935 ax-addass 10936 ax-mulass 10937 ax-distr 10938 ax-i2m1 10939 ax-1ne0 10940 ax-1rid 10941 ax-rnegex 10942 ax-rrecex 10943 ax-cnre 10944 ax-pre-lttri 10945 ax-pre-lttrn 10946 ax-pre-ltadd 10947 ax-pre-mulgt0 10948 ax-pre-sup 10949 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-rmo 3071 df-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-pss 3906 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-tp 4566 df-op 4568 df-uni 4840 df-iun 4926 df-br 5075 df-opab 5137 df-mpt 5158 df-tr 5192 df-id 5489 df-eprel 5495 df-po 5503 df-so 5504 df-fr 5544 df-we 5546 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-pred 6202 df-ord 6269 df-on 6270 df-lim 6271 df-suc 6272 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-riota 7232 df-ov 7278 df-oprab 7279 df-mpo 7280 df-om 7713 df-1st 7831 df-2nd 7832 df-frecs 8097 df-wrecs 8128 df-recs 8202 df-rdg 8241 df-1o 8297 df-er 8498 df-ec 8500 df-map 8617 df-en 8734 df-dom 8735 df-sdom 8736 df-fin 8737 df-sup 9201 df-pnf 11011 df-mnf 11012 df-xr 11013 df-ltxr 11014 df-le 11015 df-sub 11207 df-neg 11208 df-div 11633 df-nn 11974 df-2 12036 df-3 12037 df-4 12038 df-5 12039 df-6 12040 df-7 12041 df-8 12042 df-9 12043 df-n0 12234 df-z 12320 df-dec 12438 df-uz 12583 df-rp 12731 df-xneg 12848 df-xadd 12849 df-xmul 12850 df-icc 13086 df-fz 13240 df-seq 13722 df-exp 13783 df-cj 14810 df-re 14811 df-im 14812 df-sqrt 14946 df-abs 14947 df-struct 16848 df-slot 16883 df-ndx 16895 df-base 16913 df-plusg 16975 df-mulr 16976 df-tset 16981 df-ple 16982 df-ds 16984 df-xrs 17213 df-psmet 20589 df-xmet 20590 df-bl 20592 |
This theorem is referenced by: xrsmopn 23975 |
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