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Mirrors > Home > MPE Home > Th. List > bl2ioo | Structured version Visualization version GIF version |
Description: A ball in terms of an open interval of reals. (Contributed by NM, 18-May-2007.) (Revised by Mario Carneiro, 13-Nov-2013.) |
Ref | Expression |
---|---|
remet.1 | ⊢ 𝐷 = ((abs ∘ − ) ↾ (ℝ × ℝ)) |
Ref | Expression |
---|---|
bl2ioo | ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴(ball‘𝐷)𝐵) = ((𝐴 − 𝐵)(,)(𝐴 + 𝐵))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | remet.1 | . . . . . . . . . 10 ⊢ 𝐷 = ((abs ∘ − ) ↾ (ℝ × ℝ)) | |
2 | 1 | remetdval 23952 | . . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ ∧ 𝑥 ∈ ℝ) → (𝐴𝐷𝑥) = (abs‘(𝐴 − 𝑥))) |
3 | recn 10961 | . . . . . . . . . 10 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℂ) | |
4 | recn 10961 | . . . . . . . . . 10 ⊢ (𝑥 ∈ ℝ → 𝑥 ∈ ℂ) | |
5 | abssub 15038 | . . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ 𝑥 ∈ ℂ) → (abs‘(𝐴 − 𝑥)) = (abs‘(𝑥 − 𝐴))) | |
6 | 3, 4, 5 | syl2an 596 | . . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ ∧ 𝑥 ∈ ℝ) → (abs‘(𝐴 − 𝑥)) = (abs‘(𝑥 − 𝐴))) |
7 | 2, 6 | eqtrd 2778 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℝ ∧ 𝑥 ∈ ℝ) → (𝐴𝐷𝑥) = (abs‘(𝑥 − 𝐴))) |
8 | 7 | breq1d 5084 | . . . . . . 7 ⊢ ((𝐴 ∈ ℝ ∧ 𝑥 ∈ ℝ) → ((𝐴𝐷𝑥) < 𝐵 ↔ (abs‘(𝑥 − 𝐴)) < 𝐵)) |
9 | 8 | adantlr 712 | . . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ 𝑥 ∈ ℝ) → ((𝐴𝐷𝑥) < 𝐵 ↔ (abs‘(𝑥 − 𝐴)) < 𝐵)) |
10 | absdiflt 15029 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℝ ∧ 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → ((abs‘(𝑥 − 𝐴)) < 𝐵 ↔ ((𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵)))) | |
11 | 10 | 3expb 1119 | . . . . . . 7 ⊢ ((𝑥 ∈ ℝ ∧ (𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ)) → ((abs‘(𝑥 − 𝐴)) < 𝐵 ↔ ((𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵)))) |
12 | 11 | ancoms 459 | . . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ 𝑥 ∈ ℝ) → ((abs‘(𝑥 − 𝐴)) < 𝐵 ↔ ((𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵)))) |
13 | 9, 12 | bitrd 278 | . . . . 5 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ 𝑥 ∈ ℝ) → ((𝐴𝐷𝑥) < 𝐵 ↔ ((𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵)))) |
14 | 13 | pm5.32da 579 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → ((𝑥 ∈ ℝ ∧ (𝐴𝐷𝑥) < 𝐵) ↔ (𝑥 ∈ ℝ ∧ ((𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵))))) |
15 | 3anass 1094 | . . . 4 ⊢ ((𝑥 ∈ ℝ ∧ (𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵)) ↔ (𝑥 ∈ ℝ ∧ ((𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵)))) | |
16 | 14, 15 | bitr4di 289 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → ((𝑥 ∈ ℝ ∧ (𝐴𝐷𝑥) < 𝐵) ↔ (𝑥 ∈ ℝ ∧ (𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵)))) |
17 | rexr 11021 | . . . 4 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℝ*) | |
18 | 1 | rexmet 23954 | . . . . 5 ⊢ 𝐷 ∈ (∞Met‘ℝ) |
19 | elbl 23541 | . . . . 5 ⊢ ((𝐷 ∈ (∞Met‘ℝ) ∧ 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ*) → (𝑥 ∈ (𝐴(ball‘𝐷)𝐵) ↔ (𝑥 ∈ ℝ ∧ (𝐴𝐷𝑥) < 𝐵))) | |
20 | 18, 19 | mp3an1 1447 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ*) → (𝑥 ∈ (𝐴(ball‘𝐷)𝐵) ↔ (𝑥 ∈ ℝ ∧ (𝐴𝐷𝑥) < 𝐵))) |
21 | 17, 20 | sylan2 593 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝑥 ∈ (𝐴(ball‘𝐷)𝐵) ↔ (𝑥 ∈ ℝ ∧ (𝐴𝐷𝑥) < 𝐵))) |
22 | resubcl 11285 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 − 𝐵) ∈ ℝ) | |
23 | readdcl 10954 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 + 𝐵) ∈ ℝ) | |
24 | rexr 11021 | . . . . 5 ⊢ ((𝐴 − 𝐵) ∈ ℝ → (𝐴 − 𝐵) ∈ ℝ*) | |
25 | rexr 11021 | . . . . 5 ⊢ ((𝐴 + 𝐵) ∈ ℝ → (𝐴 + 𝐵) ∈ ℝ*) | |
26 | elioo2 13120 | . . . . 5 ⊢ (((𝐴 − 𝐵) ∈ ℝ* ∧ (𝐴 + 𝐵) ∈ ℝ*) → (𝑥 ∈ ((𝐴 − 𝐵)(,)(𝐴 + 𝐵)) ↔ (𝑥 ∈ ℝ ∧ (𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵)))) | |
27 | 24, 25, 26 | syl2an 596 | . . . 4 ⊢ (((𝐴 − 𝐵) ∈ ℝ ∧ (𝐴 + 𝐵) ∈ ℝ) → (𝑥 ∈ ((𝐴 − 𝐵)(,)(𝐴 + 𝐵)) ↔ (𝑥 ∈ ℝ ∧ (𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵)))) |
28 | 22, 23, 27 | syl2anc 584 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝑥 ∈ ((𝐴 − 𝐵)(,)(𝐴 + 𝐵)) ↔ (𝑥 ∈ ℝ ∧ (𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵)))) |
29 | 16, 21, 28 | 3bitr4d 311 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝑥 ∈ (𝐴(ball‘𝐷)𝐵) ↔ 𝑥 ∈ ((𝐴 − 𝐵)(,)(𝐴 + 𝐵)))) |
30 | 29 | eqrdv 2736 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴(ball‘𝐷)𝐵) = ((𝐴 − 𝐵)(,)(𝐴 + 𝐵))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∧ w3a 1086 = wceq 1539 ∈ wcel 2106 class class class wbr 5074 × cxp 5587 ↾ cres 5591 ∘ ccom 5593 ‘cfv 6433 (class class class)co 7275 ℂcc 10869 ℝcr 10870 + caddc 10874 ℝ*cxr 11008 < clt 11009 − cmin 11205 (,)cioo 13079 abscabs 14945 ∞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-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-er 8498 df-map 8617 df-en 8734 df-dom 8735 df-sdom 8736 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-n0 12234 df-z 12320 df-uz 12583 df-rp 12731 df-xadd 12849 df-ioo 13083 df-seq 13722 df-exp 13783 df-cj 14810 df-re 14811 df-im 14812 df-sqrt 14946 df-abs 14947 df-psmet 20589 df-xmet 20590 df-met 20591 df-bl 20592 |
This theorem is referenced by: ioo2bl 23956 blssioo 23958 tgioo 23959 iccntr 23984 icccmplem2 23986 reconnlem2 23990 opnreen 23994 lebnumii 24129 opnmbllem 24765 lhop 25180 dvcnvre 25183 dya2icoseg2 32245 opnrebl 34509 opnrebl2 34510 opnmbllem0 35813 iooabslt 43037 |
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