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Mirrors > Home > MPE Home > Th. List > bl2in | Structured version Visualization version 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 1189 | . . 3 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝐷 ∈ (Met‘𝑋)) | |
2 | metxmet 23395 | . . 3 ⊢ (𝐷 ∈ (Met‘𝑋) → 𝐷 ∈ (∞Met‘𝑋)) | |
3 | 1, 2 | syl 17 | . 2 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝐷 ∈ (∞Met‘𝑋)) |
4 | simpl2 1190 | . 2 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝑃 ∈ 𝑋) | |
5 | simpl3 1191 | . 2 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝑄 ∈ 𝑋) | |
6 | rexr 10952 | . . 3 ⊢ (𝑅 ∈ ℝ → 𝑅 ∈ ℝ*) | |
7 | 6 | ad2antrl 724 | . 2 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝑅 ∈ ℝ*) |
8 | simprl 767 | . . . . 5 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝑅 ∈ ℝ) | |
9 | 8, 8 | rexaddd 12897 | . . . 4 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → (𝑅 +𝑒 𝑅) = (𝑅 + 𝑅)) |
10 | 8 | recnd 10934 | . . . . 5 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝑅 ∈ ℂ) |
11 | 10 | 2timesd 12146 | . . . 4 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → (2 · 𝑅) = (𝑅 + 𝑅)) |
12 | 9, 11 | eqtr4d 2781 | . . 3 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → (𝑅 +𝑒 𝑅) = (2 · 𝑅)) |
13 | id 22 | . . . . . 6 ⊢ (𝑅 ∈ ℝ → 𝑅 ∈ ℝ) | |
14 | metcl 23393 | . . . . . 6 ⊢ ((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) → (𝑃𝐷𝑄) ∈ ℝ) | |
15 | 2re 11977 | . . . . . . . 8 ⊢ 2 ∈ ℝ | |
16 | 2pos 12006 | . . . . . . . 8 ⊢ 0 < 2 | |
17 | 15, 16 | pm3.2i 470 | . . . . . . 7 ⊢ (2 ∈ ℝ ∧ 0 < 2) |
18 | lemuldiv2 11786 | . . . . . . 7 ⊢ ((𝑅 ∈ ℝ ∧ (𝑃𝐷𝑄) ∈ ℝ ∧ (2 ∈ ℝ ∧ 0 < 2)) → ((2 · 𝑅) ≤ (𝑃𝐷𝑄) ↔ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) | |
19 | 17, 18 | mp3an3 1448 | . . . . . 6 ⊢ ((𝑅 ∈ ℝ ∧ (𝑃𝐷𝑄) ∈ ℝ) → ((2 · 𝑅) ≤ (𝑃𝐷𝑄) ↔ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) |
20 | 13, 14, 19 | syl2anr 596 | . . . . 5 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ 𝑅 ∈ ℝ) → ((2 · 𝑅) ≤ (𝑃𝐷𝑄) ↔ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) |
21 | 20 | biimprd 247 | . . . 4 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ 𝑅 ∈ ℝ) → (𝑅 ≤ ((𝑃𝐷𝑄) / 2) → (2 · 𝑅) ≤ (𝑃𝐷𝑄))) |
22 | 21 | impr 454 | . . 3 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → (2 · 𝑅) ≤ (𝑃𝐷𝑄)) |
23 | 12, 22 | eqbrtrd 5092 | . 2 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → (𝑅 +𝑒 𝑅) ≤ (𝑃𝐷𝑄)) |
24 | bldisj 23459 | . 2 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ* ∧ 𝑅 ∈ ℝ* ∧ (𝑅 +𝑒 𝑅) ≤ (𝑃𝐷𝑄))) → ((𝑃(ball‘𝐷)𝑅) ∩ (𝑄(ball‘𝐷)𝑅)) = ∅) | |
25 | 3, 4, 5, 7, 7, 23, 24 | syl33anc 1383 | 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 setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1085 = wceq 1539 ∈ wcel 2108 ∩ cin 3882 ∅c0 4253 class class class wbr 5070 ‘cfv 6418 (class class class)co 7255 ℝcr 10801 0cc0 10802 + caddc 10805 · cmul 10807 ℝ*cxr 10939 < clt 10940 ≤ cle 10941 / cdiv 11562 2c2 11958 +𝑒 cxad 12775 ∞Metcxmet 20495 Metcmet 20496 ballcbl 20497 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rmo 3071 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4837 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-id 5480 df-po 5494 df-so 5495 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-1st 7804 df-2nd 7805 df-er 8456 df-map 8575 df-en 8692 df-dom 8693 df-sdom 8694 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-div 11563 df-2 11966 df-xneg 12777 df-xadd 12778 df-psmet 20502 df-xmet 20503 df-met 20504 df-bl 20505 |
This theorem is referenced by: (None) |
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