Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > xmetec | Structured version Visualization version GIF version |
Description: The equivalence classes under the finite separation equivalence relation are infinity balls. Thus, by erdisj 8524, infinity balls are either identical or disjoint, quite unlike the usual situation with Euclidean balls which admit many kinds of overlap. (Contributed by Mario Carneiro, 24-Aug-2015.) |
Ref | Expression |
---|---|
xmeter.1 | ⊢ ∼ = (◡𝐷 “ ℝ) |
Ref | Expression |
---|---|
xmetec | ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) → [𝑃] ∼ = (𝑃(ball‘𝐷)+∞)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | xmeter.1 | . . . . 5 ⊢ ∼ = (◡𝐷 “ ℝ) | |
2 | 1 | xmeterval 23566 | . . . 4 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝑃 ∼ 𝑥 ↔ (𝑃 ∈ 𝑋 ∧ 𝑥 ∈ 𝑋 ∧ (𝑃𝐷𝑥) ∈ ℝ))) |
3 | 3anass 1093 | . . . . 5 ⊢ ((𝑃 ∈ 𝑋 ∧ 𝑥 ∈ 𝑋 ∧ (𝑃𝐷𝑥) ∈ ℝ) ↔ (𝑃 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ (𝑃𝐷𝑥) ∈ ℝ))) | |
4 | 3 | baib 535 | . . . 4 ⊢ (𝑃 ∈ 𝑋 → ((𝑃 ∈ 𝑋 ∧ 𝑥 ∈ 𝑋 ∧ (𝑃𝐷𝑥) ∈ ℝ) ↔ (𝑥 ∈ 𝑋 ∧ (𝑃𝐷𝑥) ∈ ℝ))) |
5 | 2, 4 | sylan9bb 509 | . . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) → (𝑃 ∼ 𝑥 ↔ (𝑥 ∈ 𝑋 ∧ (𝑃𝐷𝑥) ∈ ℝ))) |
6 | vex 3434 | . . . . 5 ⊢ 𝑥 ∈ V | |
7 | 6 | a1i 11 | . . . 4 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝑥 ∈ V) |
8 | elecg 8515 | . . . 4 ⊢ ((𝑥 ∈ V ∧ 𝑃 ∈ 𝑋) → (𝑥 ∈ [𝑃] ∼ ↔ 𝑃 ∼ 𝑥)) | |
9 | 7, 8 | sylan 579 | . . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) → (𝑥 ∈ [𝑃] ∼ ↔ 𝑃 ∼ 𝑥)) |
10 | xblpnf 23530 | . . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) → (𝑥 ∈ (𝑃(ball‘𝐷)+∞) ↔ (𝑥 ∈ 𝑋 ∧ (𝑃𝐷𝑥) ∈ ℝ))) | |
11 | 5, 9, 10 | 3bitr4d 310 | . 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) → (𝑥 ∈ [𝑃] ∼ ↔ 𝑥 ∈ (𝑃(ball‘𝐷)+∞))) |
12 | 11 | eqrdv 2737 | 1 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) → [𝑃] ∼ = (𝑃(ball‘𝐷)+∞)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1085 = wceq 1541 ∈ wcel 2109 Vcvv 3430 class class class wbr 5078 ◡ccnv 5587 “ cima 5591 ‘cfv 6430 (class class class)co 7268 [cec 8470 ℝcr 10854 +∞cpnf 10990 ∞Metcxmet 20563 ballcbl 20565 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1801 ax-4 1815 ax-5 1916 ax-6 1974 ax-7 2014 ax-8 2111 ax-9 2119 ax-10 2140 ax-11 2157 ax-12 2174 ax-ext 2710 ax-sep 5226 ax-nul 5233 ax-pow 5291 ax-pr 5355 ax-un 7579 ax-cnex 10911 ax-resscn 10912 ax-1cn 10913 ax-icn 10914 ax-addcl 10915 ax-addrcl 10916 ax-mulcl 10917 ax-mulrcl 10918 ax-mulcom 10919 ax-addass 10920 ax-mulass 10921 ax-distr 10922 ax-i2m1 10923 ax-1ne0 10924 ax-1rid 10925 ax-rnegex 10926 ax-rrecex 10927 ax-cnre 10928 ax-pre-lttri 10929 ax-pre-lttrn 10930 ax-pre-ltadd 10931 ax-pre-mulgt0 10932 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1544 df-fal 1554 df-ex 1786 df-nf 1790 df-sb 2071 df-mo 2541 df-eu 2570 df-clab 2717 df-cleq 2731 df-clel 2817 df-nfc 2890 df-ne 2945 df-nel 3051 df-ral 3070 df-rex 3071 df-reu 3072 df-rmo 3073 df-rab 3074 df-v 3432 df-sbc 3720 df-csb 3837 df-dif 3894 df-un 3896 df-in 3898 df-ss 3908 df-nul 4262 df-if 4465 df-pw 4540 df-sn 4567 df-pr 4569 df-op 4573 df-uni 4845 df-iun 4931 df-br 5079 df-opab 5141 df-mpt 5162 df-id 5488 df-po 5502 df-so 5503 df-xp 5594 df-rel 5595 df-cnv 5596 df-co 5597 df-dm 5598 df-rn 5599 df-res 5600 df-ima 5601 df-iota 6388 df-fun 6432 df-fn 6433 df-f 6434 df-f1 6435 df-fo 6436 df-f1o 6437 df-fv 6438 df-riota 7225 df-ov 7271 df-oprab 7272 df-mpo 7273 df-1st 7817 df-2nd 7818 df-er 8472 df-ec 8474 df-map 8591 df-en 8708 df-dom 8709 df-sdom 8710 df-pnf 10995 df-mnf 10996 df-xr 10997 df-ltxr 10998 df-le 10999 df-sub 11190 df-neg 11191 df-div 11616 df-2 12019 df-rp 12713 df-xneg 12830 df-xadd 12831 df-xmul 12832 df-psmet 20570 df-xmet 20571 df-bl 20573 |
This theorem is referenced by: blssec 23569 blpnfctr 23570 |
Copyright terms: Public domain | W3C validator |