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Mirrors > Home > ILE Home > Th. List > cnbl0 | GIF version |
Description: Two ways to write the open ball centered at zero. (Contributed by Mario Carneiro, 8-Sep-2015.) |
Ref | Expression |
---|---|
cnblcld.1 | ⊢ 𝐷 = (abs ∘ − ) |
Ref | Expression |
---|---|
cnbl0 | ⊢ (𝑅 ∈ ℝ* → (◡abs “ (0[,)𝑅)) = (0(ball‘𝐷)𝑅)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-3an 970 | . . . . . 6 ⊢ (((abs‘𝑥) ∈ ℝ ∧ 0 ≤ (abs‘𝑥) ∧ (abs‘𝑥) < 𝑅) ↔ (((abs‘𝑥) ∈ ℝ ∧ 0 ≤ (abs‘𝑥)) ∧ (abs‘𝑥) < 𝑅)) | |
2 | abscl 10993 | . . . . . . . . 9 ⊢ (𝑥 ∈ ℂ → (abs‘𝑥) ∈ ℝ) | |
3 | absge0 11002 | . . . . . . . . 9 ⊢ (𝑥 ∈ ℂ → 0 ≤ (abs‘𝑥)) | |
4 | 2, 3 | jca 304 | . . . . . . . 8 ⊢ (𝑥 ∈ ℂ → ((abs‘𝑥) ∈ ℝ ∧ 0 ≤ (abs‘𝑥))) |
5 | 4 | adantl 275 | . . . . . . 7 ⊢ ((𝑅 ∈ ℝ* ∧ 𝑥 ∈ ℂ) → ((abs‘𝑥) ∈ ℝ ∧ 0 ≤ (abs‘𝑥))) |
6 | 5 | biantrurd 303 | . . . . . 6 ⊢ ((𝑅 ∈ ℝ* ∧ 𝑥 ∈ ℂ) → ((abs‘𝑥) < 𝑅 ↔ (((abs‘𝑥) ∈ ℝ ∧ 0 ≤ (abs‘𝑥)) ∧ (abs‘𝑥) < 𝑅))) |
7 | 1, 6 | bitr4id 198 | . . . . 5 ⊢ ((𝑅 ∈ ℝ* ∧ 𝑥 ∈ ℂ) → (((abs‘𝑥) ∈ ℝ ∧ 0 ≤ (abs‘𝑥) ∧ (abs‘𝑥) < 𝑅) ↔ (abs‘𝑥) < 𝑅)) |
8 | 0re 7899 | . . . . . 6 ⊢ 0 ∈ ℝ | |
9 | simpl 108 | . . . . . 6 ⊢ ((𝑅 ∈ ℝ* ∧ 𝑥 ∈ ℂ) → 𝑅 ∈ ℝ*) | |
10 | elico2 9873 | . . . . . 6 ⊢ ((0 ∈ ℝ ∧ 𝑅 ∈ ℝ*) → ((abs‘𝑥) ∈ (0[,)𝑅) ↔ ((abs‘𝑥) ∈ ℝ ∧ 0 ≤ (abs‘𝑥) ∧ (abs‘𝑥) < 𝑅))) | |
11 | 8, 9, 10 | sylancr 411 | . . . . 5 ⊢ ((𝑅 ∈ ℝ* ∧ 𝑥 ∈ ℂ) → ((abs‘𝑥) ∈ (0[,)𝑅) ↔ ((abs‘𝑥) ∈ ℝ ∧ 0 ≤ (abs‘𝑥) ∧ (abs‘𝑥) < 𝑅))) |
12 | 0cn 7891 | . . . . . . . . 9 ⊢ 0 ∈ ℂ | |
13 | cnblcld.1 | . . . . . . . . . . 11 ⊢ 𝐷 = (abs ∘ − ) | |
14 | 13 | cnmetdval 13169 | . . . . . . . . . 10 ⊢ ((0 ∈ ℂ ∧ 𝑥 ∈ ℂ) → (0𝐷𝑥) = (abs‘(0 − 𝑥))) |
15 | abssub 11043 | . . . . . . . . . 10 ⊢ ((0 ∈ ℂ ∧ 𝑥 ∈ ℂ) → (abs‘(0 − 𝑥)) = (abs‘(𝑥 − 0))) | |
16 | 14, 15 | eqtrd 2198 | . . . . . . . . 9 ⊢ ((0 ∈ ℂ ∧ 𝑥 ∈ ℂ) → (0𝐷𝑥) = (abs‘(𝑥 − 0))) |
17 | 12, 16 | mpan 421 | . . . . . . . 8 ⊢ (𝑥 ∈ ℂ → (0𝐷𝑥) = (abs‘(𝑥 − 0))) |
18 | subid1 8118 | . . . . . . . . 9 ⊢ (𝑥 ∈ ℂ → (𝑥 − 0) = 𝑥) | |
19 | 18 | fveq2d 5490 | . . . . . . . 8 ⊢ (𝑥 ∈ ℂ → (abs‘(𝑥 − 0)) = (abs‘𝑥)) |
20 | 17, 19 | eqtrd 2198 | . . . . . . 7 ⊢ (𝑥 ∈ ℂ → (0𝐷𝑥) = (abs‘𝑥)) |
21 | 20 | adantl 275 | . . . . . 6 ⊢ ((𝑅 ∈ ℝ* ∧ 𝑥 ∈ ℂ) → (0𝐷𝑥) = (abs‘𝑥)) |
22 | 21 | breq1d 3992 | . . . . 5 ⊢ ((𝑅 ∈ ℝ* ∧ 𝑥 ∈ ℂ) → ((0𝐷𝑥) < 𝑅 ↔ (abs‘𝑥) < 𝑅)) |
23 | 7, 11, 22 | 3bitr4d 219 | . . . 4 ⊢ ((𝑅 ∈ ℝ* ∧ 𝑥 ∈ ℂ) → ((abs‘𝑥) ∈ (0[,)𝑅) ↔ (0𝐷𝑥) < 𝑅)) |
24 | 23 | pm5.32da 448 | . . 3 ⊢ (𝑅 ∈ ℝ* → ((𝑥 ∈ ℂ ∧ (abs‘𝑥) ∈ (0[,)𝑅)) ↔ (𝑥 ∈ ℂ ∧ (0𝐷𝑥) < 𝑅))) |
25 | absf 11052 | . . . . 5 ⊢ abs:ℂ⟶ℝ | |
26 | ffn 5337 | . . . . 5 ⊢ (abs:ℂ⟶ℝ → abs Fn ℂ) | |
27 | 25, 26 | ax-mp 5 | . . . 4 ⊢ abs Fn ℂ |
28 | elpreima 5604 | . . . 4 ⊢ (abs Fn ℂ → (𝑥 ∈ (◡abs “ (0[,)𝑅)) ↔ (𝑥 ∈ ℂ ∧ (abs‘𝑥) ∈ (0[,)𝑅)))) | |
29 | 27, 28 | mp1i 10 | . . 3 ⊢ (𝑅 ∈ ℝ* → (𝑥 ∈ (◡abs “ (0[,)𝑅)) ↔ (𝑥 ∈ ℂ ∧ (abs‘𝑥) ∈ (0[,)𝑅)))) |
30 | cnxmet 13171 | . . . . 5 ⊢ (abs ∘ − ) ∈ (∞Met‘ℂ) | |
31 | 13, 30 | eqeltri 2239 | . . . 4 ⊢ 𝐷 ∈ (∞Met‘ℂ) |
32 | elbl 13031 | . . . 4 ⊢ ((𝐷 ∈ (∞Met‘ℂ) ∧ 0 ∈ ℂ ∧ 𝑅 ∈ ℝ*) → (𝑥 ∈ (0(ball‘𝐷)𝑅) ↔ (𝑥 ∈ ℂ ∧ (0𝐷𝑥) < 𝑅))) | |
33 | 31, 12, 32 | mp3an12 1317 | . . 3 ⊢ (𝑅 ∈ ℝ* → (𝑥 ∈ (0(ball‘𝐷)𝑅) ↔ (𝑥 ∈ ℂ ∧ (0𝐷𝑥) < 𝑅))) |
34 | 24, 29, 33 | 3bitr4d 219 | . 2 ⊢ (𝑅 ∈ ℝ* → (𝑥 ∈ (◡abs “ (0[,)𝑅)) ↔ 𝑥 ∈ (0(ball‘𝐷)𝑅))) |
35 | 34 | eqrdv 2163 | 1 ⊢ (𝑅 ∈ ℝ* → (◡abs “ (0[,)𝑅)) = (0(ball‘𝐷)𝑅)) |
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 ◡ccnv 4603 “ cima 4607 ∘ ccom 4608 Fn wfn 5183 ⟶wf 5184 ‘cfv 5188 (class class class)co 5842 ℂcc 7751 ℝcr 7752 0cc0 7753 ℝ*cxr 7932 < clt 7933 ≤ cle 7934 − cmin 8069 [,)cico 9826 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-ico 9830 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: (None) |
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