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Mirrors > Home > ILE Home > Th. List > bl2in | GIF version |
Description: Two balls are disjoint if they don't overlap. (Contributed by NM, 11-Mar-2007.) (Revised by Mario Carneiro, 23-Aug-2015.) |
Ref | Expression |
---|---|
bl2in | ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → ((𝑃(ball‘𝐷)𝑅) ∩ (𝑄(ball‘𝐷)𝑅)) = ∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpl1 990 | . . 3 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝐷 ∈ (Met‘𝑋)) | |
2 | metxmet 12995 | . . 3 ⊢ (𝐷 ∈ (Met‘𝑋) → 𝐷 ∈ (∞Met‘𝑋)) | |
3 | 1, 2 | syl 14 | . 2 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝐷 ∈ (∞Met‘𝑋)) |
4 | simpl2 991 | . 2 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝑃 ∈ 𝑋) | |
5 | simpl3 992 | . 2 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝑄 ∈ 𝑋) | |
6 | rexr 7944 | . . 3 ⊢ (𝑅 ∈ ℝ → 𝑅 ∈ ℝ*) | |
7 | 6 | ad2antrl 482 | . 2 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝑅 ∈ ℝ*) |
8 | simprl 521 | . . . . 5 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝑅 ∈ ℝ) | |
9 | rexadd 9788 | . . . . 5 ⊢ ((𝑅 ∈ ℝ ∧ 𝑅 ∈ ℝ) → (𝑅 +𝑒 𝑅) = (𝑅 + 𝑅)) | |
10 | 8, 8, 9 | syl2anc 409 | . . . 4 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → (𝑅 +𝑒 𝑅) = (𝑅 + 𝑅)) |
11 | 8 | recnd 7927 | . . . . 5 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝑅 ∈ ℂ) |
12 | 11 | 2timesd 9099 | . . . 4 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → (2 · 𝑅) = (𝑅 + 𝑅)) |
13 | 10, 12 | eqtr4d 2201 | . . 3 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → (𝑅 +𝑒 𝑅) = (2 · 𝑅)) |
14 | id 19 | . . . . . 6 ⊢ (𝑅 ∈ ℝ → 𝑅 ∈ ℝ) | |
15 | metcl 12993 | . . . . . 6 ⊢ ((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) → (𝑃𝐷𝑄) ∈ ℝ) | |
16 | 2re 8927 | . . . . . . . 8 ⊢ 2 ∈ ℝ | |
17 | 2pos 8948 | . . . . . . . 8 ⊢ 0 < 2 | |
18 | 16, 17 | pm3.2i 270 | . . . . . . 7 ⊢ (2 ∈ ℝ ∧ 0 < 2) |
19 | lemuldiv2 8777 | . . . . . . 7 ⊢ ((𝑅 ∈ ℝ ∧ (𝑃𝐷𝑄) ∈ ℝ ∧ (2 ∈ ℝ ∧ 0 < 2)) → ((2 · 𝑅) ≤ (𝑃𝐷𝑄) ↔ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) | |
20 | 18, 19 | mp3an3 1316 | . . . . . 6 ⊢ ((𝑅 ∈ ℝ ∧ (𝑃𝐷𝑄) ∈ ℝ) → ((2 · 𝑅) ≤ (𝑃𝐷𝑄) ↔ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) |
21 | 14, 15, 20 | syl2anr 288 | . . . . 5 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ 𝑅 ∈ ℝ) → ((2 · 𝑅) ≤ (𝑃𝐷𝑄) ↔ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) |
22 | 21 | biimprd 157 | . . . 4 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ 𝑅 ∈ ℝ) → (𝑅 ≤ ((𝑃𝐷𝑄) / 2) → (2 · 𝑅) ≤ (𝑃𝐷𝑄))) |
23 | 22 | impr 377 | . . 3 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → (2 · 𝑅) ≤ (𝑃𝐷𝑄)) |
24 | 13, 23 | eqbrtrd 4004 | . 2 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → (𝑅 +𝑒 𝑅) ≤ (𝑃𝐷𝑄)) |
25 | bldisj 13041 | . 2 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ* ∧ 𝑅 ∈ ℝ* ∧ (𝑅 +𝑒 𝑅) ≤ (𝑃𝐷𝑄))) → ((𝑃(ball‘𝐷)𝑅) ∩ (𝑄(ball‘𝐷)𝑅)) = ∅) | |
26 | 3, 4, 5, 7, 7, 24, 25 | syl33anc 1243 | 1 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → ((𝑃(ball‘𝐷)𝑅) ∩ (𝑄(ball‘𝐷)𝑅)) = ∅) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ↔ wb 104 ∧ w3a 968 = wceq 1343 ∈ wcel 2136 ∩ cin 3115 ∅c0 3409 class class class wbr 3982 ‘cfv 5188 (class class class)co 5842 ℝcr 7752 0cc0 7753 + caddc 7756 · cmul 7758 ℝ*cxr 7932 < clt 7933 ≤ cle 7934 / cdiv 8568 2c2 8908 +𝑒 cxad 9706 ∞Metcxmet 12620 Metcmet 12621 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-sep 4100 ax-pow 4153 ax-pr 4187 ax-un 4411 ax-setind 4514 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 |
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-iun 3868 df-br 3983 df-opab 4044 df-mpt 4045 df-id 4271 df-po 4274 df-iso 4275 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-fv 5196 df-riota 5798 df-ov 5845 df-oprab 5846 df-mpo 5847 df-1st 6108 df-2nd 6109 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-2 8916 df-xadd 9709 df-psmet 12627 df-xmet 12628 df-met 12629 df-bl 12630 |
This theorem is referenced by: (None) |
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