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Mirrors > Home > MPE Home > Th. List > xblpnf | Structured version Visualization version GIF version |
Description: The infinity ball in an extended metric is the set of all points that are a finite distance from the center. (Contributed by Mario Carneiro, 23-Aug-2015.) |
Ref | Expression |
---|---|
xblpnf | ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) → (𝐴 ∈ (𝑃(ball‘𝐷)+∞) ↔ (𝐴 ∈ 𝑋 ∧ (𝑃𝐷𝐴) ∈ ℝ))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pnfxr 10773 | . . 3 ⊢ +∞ ∈ ℝ* | |
2 | elbl 23141 | . . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ +∞ ∈ ℝ*) → (𝐴 ∈ (𝑃(ball‘𝐷)+∞) ↔ (𝐴 ∈ 𝑋 ∧ (𝑃𝐷𝐴) < +∞))) | |
3 | 1, 2 | mp3an3 1451 | . 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) → (𝐴 ∈ (𝑃(ball‘𝐷)+∞) ↔ (𝐴 ∈ 𝑋 ∧ (𝑃𝐷𝐴) < +∞))) |
4 | xmetcl 23084 | . . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝐴 ∈ 𝑋) → (𝑃𝐷𝐴) ∈ ℝ*) | |
5 | xmetge0 23097 | . . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝐴 ∈ 𝑋) → 0 ≤ (𝑃𝐷𝐴)) | |
6 | ge0nemnf 12649 | . . . . . . . 8 ⊢ (((𝑃𝐷𝐴) ∈ ℝ* ∧ 0 ≤ (𝑃𝐷𝐴)) → (𝑃𝐷𝐴) ≠ -∞) | |
7 | 4, 5, 6 | syl2anc 587 | . . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝐴 ∈ 𝑋) → (𝑃𝐷𝐴) ≠ -∞) |
8 | ngtmnft 12642 | . . . . . . . . 9 ⊢ ((𝑃𝐷𝐴) ∈ ℝ* → ((𝑃𝐷𝐴) = -∞ ↔ ¬ -∞ < (𝑃𝐷𝐴))) | |
9 | 4, 8 | syl 17 | . . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝐴 ∈ 𝑋) → ((𝑃𝐷𝐴) = -∞ ↔ ¬ -∞ < (𝑃𝐷𝐴))) |
10 | 9 | necon2abid 2976 | . . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝐴 ∈ 𝑋) → (-∞ < (𝑃𝐷𝐴) ↔ (𝑃𝐷𝐴) ≠ -∞)) |
11 | 7, 10 | mpbird 260 | . . . . . 6 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝐴 ∈ 𝑋) → -∞ < (𝑃𝐷𝐴)) |
12 | 11 | biantrurd 536 | . . . . 5 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝐴 ∈ 𝑋) → ((𝑃𝐷𝐴) < +∞ ↔ (-∞ < (𝑃𝐷𝐴) ∧ (𝑃𝐷𝐴) < +∞))) |
13 | xrrebnd 12644 | . . . . . 6 ⊢ ((𝑃𝐷𝐴) ∈ ℝ* → ((𝑃𝐷𝐴) ∈ ℝ ↔ (-∞ < (𝑃𝐷𝐴) ∧ (𝑃𝐷𝐴) < +∞))) | |
14 | 4, 13 | syl 17 | . . . . 5 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝐴 ∈ 𝑋) → ((𝑃𝐷𝐴) ∈ ℝ ↔ (-∞ < (𝑃𝐷𝐴) ∧ (𝑃𝐷𝐴) < +∞))) |
15 | 12, 14 | bitr4d 285 | . . . 4 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝐴 ∈ 𝑋) → ((𝑃𝐷𝐴) < +∞ ↔ (𝑃𝐷𝐴) ∈ ℝ)) |
16 | 15 | 3expa 1119 | . . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ 𝐴 ∈ 𝑋) → ((𝑃𝐷𝐴) < +∞ ↔ (𝑃𝐷𝐴) ∈ ℝ)) |
17 | 16 | pm5.32da 582 | . 2 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) → ((𝐴 ∈ 𝑋 ∧ (𝑃𝐷𝐴) < +∞) ↔ (𝐴 ∈ 𝑋 ∧ (𝑃𝐷𝐴) ∈ ℝ))) |
18 | 3, 17 | bitrd 282 | 1 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) → (𝐴 ∈ (𝑃(ball‘𝐷)+∞) ↔ (𝐴 ∈ 𝑋 ∧ (𝑃𝐷𝐴) ∈ ℝ))) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 399 ∧ w3a 1088 = wceq 1542 ∈ wcel 2114 ≠ wne 2934 class class class wbr 5030 ‘cfv 6339 (class class class)co 7170 ℝcr 10614 0cc0 10615 +∞cpnf 10750 -∞cmnf 10751 ℝ*cxr 10752 < clt 10753 ≤ cle 10754 ∞Metcxmet 20202 ballcbl 20204 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1975 ax-7 2020 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2162 ax-12 2179 ax-ext 2710 ax-sep 5167 ax-nul 5174 ax-pow 5232 ax-pr 5296 ax-un 7479 ax-cnex 10671 ax-resscn 10672 ax-1cn 10673 ax-icn 10674 ax-addcl 10675 ax-addrcl 10676 ax-mulcl 10677 ax-mulrcl 10678 ax-mulcom 10679 ax-addass 10680 ax-mulass 10681 ax-distr 10682 ax-i2m1 10683 ax-1ne0 10684 ax-1rid 10685 ax-rnegex 10686 ax-rrecex 10687 ax-cnre 10688 ax-pre-lttri 10689 ax-pre-lttrn 10690 ax-pre-ltadd 10691 ax-pre-mulgt0 10692 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1787 df-nf 1791 df-sb 2075 df-mo 2540 df-eu 2570 df-clab 2717 df-cleq 2730 df-clel 2811 df-nfc 2881 df-ne 2935 df-nel 3039 df-ral 3058 df-rex 3059 df-reu 3060 df-rmo 3061 df-rab 3062 df-v 3400 df-sbc 3681 df-csb 3791 df-dif 3846 df-un 3848 df-in 3850 df-ss 3860 df-nul 4212 df-if 4415 df-pw 4490 df-sn 4517 df-pr 4519 df-op 4523 df-uni 4797 df-iun 4883 df-br 5031 df-opab 5093 df-mpt 5111 df-id 5429 df-po 5442 df-so 5443 df-xp 5531 df-rel 5532 df-cnv 5533 df-co 5534 df-dm 5535 df-rn 5536 df-res 5537 df-ima 5538 df-iota 6297 df-fun 6341 df-fn 6342 df-f 6343 df-f1 6344 df-fo 6345 df-f1o 6346 df-fv 6347 df-riota 7127 df-ov 7173 df-oprab 7174 df-mpo 7175 df-1st 7714 df-2nd 7715 df-er 8320 df-map 8439 df-en 8556 df-dom 8557 df-sdom 8558 df-pnf 10755 df-mnf 10756 df-xr 10757 df-ltxr 10758 df-le 10759 df-sub 10950 df-neg 10951 df-div 11376 df-2 11779 df-rp 12473 df-xneg 12590 df-xadd 12591 df-xmul 12592 df-psmet 20209 df-xmet 20210 df-bl 20212 |
This theorem is referenced by: blpnf 23150 xmetec 23187 metdstri 23603 |
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