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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 1190 | . . 3 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝐷 ∈ (Met‘𝑋)) | |
2 | metxmet 23487 | . . 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 1191 | . 2 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝑃 ∈ 𝑋) | |
5 | simpl3 1192 | . 2 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝑄 ∈ 𝑋) | |
6 | rexr 11021 | . . 3 ⊢ (𝑅 ∈ ℝ → 𝑅 ∈ ℝ*) | |
7 | 6 | ad2antrl 725 | . 2 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝑅 ∈ ℝ*) |
8 | simprl 768 | . . . . 5 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝑅 ∈ ℝ) | |
9 | 8, 8 | rexaddd 12968 | . . . 4 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → (𝑅 +𝑒 𝑅) = (𝑅 + 𝑅)) |
10 | 8 | recnd 11003 | . . . . 5 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → 𝑅 ∈ ℂ) |
11 | 10 | 2timesd 12216 | . . . 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 23485 | . . . . . 6 ⊢ ((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) → (𝑃𝐷𝑄) ∈ ℝ) | |
15 | 2re 12047 | . . . . . . . 8 ⊢ 2 ∈ ℝ | |
16 | 2pos 12076 | . . . . . . . 8 ⊢ 0 < 2 | |
17 | 15, 16 | pm3.2i 471 | . . . . . . 7 ⊢ (2 ∈ ℝ ∧ 0 < 2) |
18 | lemuldiv2 11856 | . . . . . . 7 ⊢ ((𝑅 ∈ ℝ ∧ (𝑃𝐷𝑄) ∈ ℝ ∧ (2 ∈ ℝ ∧ 0 < 2)) → ((2 · 𝑅) ≤ (𝑃𝐷𝑄) ↔ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) | |
19 | 17, 18 | mp3an3 1449 | . . . . . 6 ⊢ ((𝑅 ∈ ℝ ∧ (𝑃𝐷𝑄) ∈ ℝ) → ((2 · 𝑅) ≤ (𝑃𝐷𝑄) ↔ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) |
20 | 13, 14, 19 | syl2anr 597 | . . . . 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 455 | . . 3 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → (2 · 𝑅) ≤ (𝑃𝐷𝑄)) |
23 | 12, 22 | eqbrtrd 5096 | . 2 ⊢ (((𝐷 ∈ (Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑄 ∈ 𝑋) ∧ (𝑅 ∈ ℝ ∧ 𝑅 ≤ ((𝑃𝐷𝑄) / 2))) → (𝑅 +𝑒 𝑅) ≤ (𝑃𝐷𝑄)) |
24 | bldisj 23551 | . 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 1384 | 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 396 ∧ w3a 1086 = wceq 1539 ∈ wcel 2106 ∩ cin 3886 ∅c0 4256 class class class wbr 5074 ‘cfv 6433 (class class class)co 7275 ℝcr 10870 0cc0 10871 + caddc 10874 · cmul 10876 ℝ*cxr 11008 < clt 11009 ≤ cle 11010 / cdiv 11632 2c2 12028 +𝑒 cxad 12846 ∞Metcxmet 20582 Metcmet 20583 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 |
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-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-id 5489 df-po 5503 df-so 5504 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-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-1st 7831 df-2nd 7832 df-er 8498 df-map 8617 df-en 8734 df-dom 8735 df-sdom 8736 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-2 12036 df-xneg 12848 df-xadd 12849 df-psmet 20589 df-xmet 20590 df-met 20591 df-bl 20592 |
This theorem is referenced by: (None) |
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