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Mirrors > Home > ILE Home > Th. List > bl2ioo | 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 13179 | . . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ ∧ 𝑥 ∈ ℝ) → (𝐴𝐷𝑥) = (abs‘(𝐴 − 𝑥))) |
3 | recn 7886 | . . . . . . . . . 10 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℂ) | |
4 | recn 7886 | . . . . . . . . . 10 ⊢ (𝑥 ∈ ℝ → 𝑥 ∈ ℂ) | |
5 | abssub 11043 | . . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ 𝑥 ∈ ℂ) → (abs‘(𝐴 − 𝑥)) = (abs‘(𝑥 − 𝐴))) | |
6 | 3, 4, 5 | syl2an 287 | . . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ ∧ 𝑥 ∈ ℝ) → (abs‘(𝐴 − 𝑥)) = (abs‘(𝑥 − 𝐴))) |
7 | 2, 6 | eqtrd 2198 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℝ ∧ 𝑥 ∈ ℝ) → (𝐴𝐷𝑥) = (abs‘(𝑥 − 𝐴))) |
8 | 7 | breq1d 3992 | . . . . . . 7 ⊢ ((𝐴 ∈ ℝ ∧ 𝑥 ∈ ℝ) → ((𝐴𝐷𝑥) < 𝐵 ↔ (abs‘(𝑥 − 𝐴)) < 𝐵)) |
9 | 8 | adantlr 469 | . . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ 𝑥 ∈ ℝ) → ((𝐴𝐷𝑥) < 𝐵 ↔ (abs‘(𝑥 − 𝐴)) < 𝐵)) |
10 | absdiflt 11034 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℝ ∧ 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → ((abs‘(𝑥 − 𝐴)) < 𝐵 ↔ ((𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵)))) | |
11 | 10 | 3expb 1194 | . . . . . . 7 ⊢ ((𝑥 ∈ ℝ ∧ (𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ)) → ((abs‘(𝑥 − 𝐴)) < 𝐵 ↔ ((𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵)))) |
12 | 11 | ancoms 266 | . . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ 𝑥 ∈ ℝ) → ((abs‘(𝑥 − 𝐴)) < 𝐵 ↔ ((𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵)))) |
13 | 9, 12 | bitrd 187 | . . . . 5 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ 𝑥 ∈ ℝ) → ((𝐴𝐷𝑥) < 𝐵 ↔ ((𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵)))) |
14 | 13 | pm5.32da 448 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → ((𝑥 ∈ ℝ ∧ (𝐴𝐷𝑥) < 𝐵) ↔ (𝑥 ∈ ℝ ∧ ((𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵))))) |
15 | 3anass 972 | . . . 4 ⊢ ((𝑥 ∈ ℝ ∧ (𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵)) ↔ (𝑥 ∈ ℝ ∧ ((𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵)))) | |
16 | 14, 15 | bitr4di 197 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → ((𝑥 ∈ ℝ ∧ (𝐴𝐷𝑥) < 𝐵) ↔ (𝑥 ∈ ℝ ∧ (𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵)))) |
17 | rexr 7944 | . . . 4 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℝ*) | |
18 | 1 | rexmet 13181 | . . . . 5 ⊢ 𝐷 ∈ (∞Met‘ℝ) |
19 | elbl 13031 | . . . . 5 ⊢ ((𝐷 ∈ (∞Met‘ℝ) ∧ 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ*) → (𝑥 ∈ (𝐴(ball‘𝐷)𝐵) ↔ (𝑥 ∈ ℝ ∧ (𝐴𝐷𝑥) < 𝐵))) | |
20 | 18, 19 | mp3an1 1314 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ*) → (𝑥 ∈ (𝐴(ball‘𝐷)𝐵) ↔ (𝑥 ∈ ℝ ∧ (𝐴𝐷𝑥) < 𝐵))) |
21 | 17, 20 | sylan2 284 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝑥 ∈ (𝐴(ball‘𝐷)𝐵) ↔ (𝑥 ∈ ℝ ∧ (𝐴𝐷𝑥) < 𝐵))) |
22 | resubcl 8162 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 − 𝐵) ∈ ℝ) | |
23 | readdcl 7879 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 + 𝐵) ∈ ℝ) | |
24 | rexr 7944 | . . . . 5 ⊢ ((𝐴 − 𝐵) ∈ ℝ → (𝐴 − 𝐵) ∈ ℝ*) | |
25 | rexr 7944 | . . . . 5 ⊢ ((𝐴 + 𝐵) ∈ ℝ → (𝐴 + 𝐵) ∈ ℝ*) | |
26 | elioo2 9857 | . . . . 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 287 | . . . 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 409 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝑥 ∈ ((𝐴 − 𝐵)(,)(𝐴 + 𝐵)) ↔ (𝑥 ∈ ℝ ∧ (𝐴 − 𝐵) < 𝑥 ∧ 𝑥 < (𝐴 + 𝐵)))) |
29 | 16, 21, 28 | 3bitr4d 219 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝑥 ∈ (𝐴(ball‘𝐷)𝐵) ↔ 𝑥 ∈ ((𝐴 − 𝐵)(,)(𝐴 + 𝐵)))) |
30 | 29 | eqrdv 2163 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴(ball‘𝐷)𝐵) = ((𝐴 − 𝐵)(,)(𝐴 + 𝐵))) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ↔ wb 104 ∧ w3a 968 = wceq 1343 ∈ wcel 2136 class class class wbr 3982 × cxp 4602 ↾ cres 4606 ∘ ccom 4608 ‘cfv 5188 (class class class)co 5842 ℂcc 7751 ℝcr 7752 + caddc 7756 ℝ*cxr 7932 < clt 7933 − cmin 8069 (,)cioo 9824 abscabs 10939 ∞Metcxmet 12620 ballcbl 12622 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-13 2138 ax-14 2139 ax-ext 2147 ax-coll 4097 ax-sep 4100 ax-nul 4108 ax-pow 4153 ax-pr 4187 ax-un 4411 ax-setind 4514 ax-iinf 4565 ax-cnex 7844 ax-resscn 7845 ax-1cn 7846 ax-1re 7847 ax-icn 7848 ax-addcl 7849 ax-addrcl 7850 ax-mulcl 7851 ax-mulrcl 7852 ax-addcom 7853 ax-mulcom 7854 ax-addass 7855 ax-mulass 7856 ax-distr 7857 ax-i2m1 7858 ax-0lt1 7859 ax-1rid 7860 ax-0id 7861 ax-rnegex 7862 ax-precex 7863 ax-cnre 7864 ax-pre-ltirr 7865 ax-pre-ltwlin 7866 ax-pre-lttrn 7867 ax-pre-apti 7868 ax-pre-ltadd 7869 ax-pre-mulgt0 7870 ax-pre-mulext 7871 ax-arch 7872 ax-caucvg 7873 |
This theorem depends on definitions: df-bi 116 df-dc 825 df-3or 969 df-3an 970 df-tru 1346 df-fal 1349 df-nf 1449 df-sb 1751 df-eu 2017 df-mo 2018 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-ne 2337 df-nel 2432 df-ral 2449 df-rex 2450 df-reu 2451 df-rmo 2452 df-rab 2453 df-v 2728 df-sbc 2952 df-csb 3046 df-dif 3118 df-un 3120 df-in 3122 df-ss 3129 df-nul 3410 df-if 3521 df-pw 3561 df-sn 3582 df-pr 3583 df-op 3585 df-uni 3790 df-int 3825 df-iun 3868 df-br 3983 df-opab 4044 df-mpt 4045 df-tr 4081 df-id 4271 df-po 4274 df-iso 4275 df-iord 4344 df-on 4346 df-ilim 4347 df-suc 4349 df-iom 4568 df-xp 4610 df-rel 4611 df-cnv 4612 df-co 4613 df-dm 4614 df-rn 4615 df-res 4616 df-ima 4617 df-iota 5153 df-fun 5190 df-fn 5191 df-f 5192 df-f1 5193 df-fo 5194 df-f1o 5195 df-fv 5196 df-riota 5798 df-ov 5845 df-oprab 5846 df-mpo 5847 df-1st 6108 df-2nd 6109 df-recs 6273 df-frec 6359 df-map 6616 df-pnf 7935 df-mnf 7936 df-xr 7937 df-ltxr 7938 df-le 7939 df-sub 8071 df-neg 8072 df-reap 8473 df-ap 8480 df-div 8569 df-inn 8858 df-2 8916 df-3 8917 df-4 8918 df-n0 9115 df-z 9192 df-uz 9467 df-rp 9590 df-xadd 9709 df-ioo 9828 df-seqfrec 10381 df-exp 10455 df-cj 10784 df-re 10785 df-im 10786 df-rsqrt 10940 df-abs 10941 df-psmet 12627 df-xmet 12628 df-met 12629 df-bl 12630 |
This theorem is referenced by: ioo2bl 13183 blssioo 13185 tgioo 13186 |
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