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Mirrors > Home > MPE Home > Th. List > xmetcl | Structured version Visualization version GIF version |
Description: Closure of the distance function of a metric space. Part of Property M1 of [Kreyszig] p. 3. (Contributed by NM, 30-Aug-2006.) |
Ref | Expression |
---|---|
xmetcl | ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋) → (𝐴𝐷𝐵) ∈ ℝ*) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | xmetf 21944 | . 2 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝐷:(𝑋 × 𝑋)⟶ℝ*) | |
2 | fovrn 6702 | . 2 ⊢ ((𝐷:(𝑋 × 𝑋)⟶ℝ* ∧ 𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋) → (𝐴𝐷𝐵) ∈ ℝ*) | |
3 | 1, 2 | syl3an1 1351 | 1 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋) → (𝐴𝐷𝐵) ∈ ℝ*) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ w3a 1031 ∈ wcel 1977 × cxp 5036 ⟶wf 5800 ‘cfv 5804 (class class class)co 6549 ℝ*cxr 9952 ∞Metcxmt 19552 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 ax-un 6847 ax-cnex 9871 ax-resscn 9872 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-ral 2901 df-rex 2902 df-rab 2905 df-v 3175 df-sbc 3403 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-br 4584 df-opab 4644 df-mpt 4645 df-id 4953 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-fv 5812 df-ov 6552 df-oprab 6553 df-mpt2 6554 df-map 7746 df-xr 9957 df-xmet 19560 |
This theorem is referenced by: xmetge0 21959 xmetlecl 21961 xmetsym 21962 xmetrtri 21970 xmetrtri2 21971 xmetgt0 21973 prdsdsf 21982 prdsxmetlem 21983 imasdsf1olem 21988 imasf1oxmet 21990 xpsdsval 21996 xblpnf 22011 bldisj 22013 blgt0 22014 xblss2 22017 blhalf 22020 xbln0 22029 blin 22036 blss 22040 xmscl 22077 prdsbl 22106 blsscls2 22119 blcld 22120 blcls 22121 comet 22128 stdbdxmet 22130 stdbdmet 22131 stdbdbl 22132 tmsxpsval2 22154 metcnpi3 22161 txmetcnp 22162 xrsmopn 22423 metdcnlem 22447 metdsf 22459 metdsge 22460 metdstri 22462 metdsle 22463 metdscnlem 22466 metnrmlem1 22470 metnrmlem3 22472 lmnn 22869 iscfil2 22872 iscau3 22884 dvlip2 23562 heicant 32614 |
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