Mathbox for Thierry Arnoux |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > rrexthaus | Structured version Visualization version GIF version |
Description: The topology of an extension of ℝ is Hausdorff. (Contributed by Thierry Arnoux, 7-Sep-2018.) |
Ref | Expression |
---|---|
rrexthaus.1 | ⊢ 𝐾 = (TopOpen‘𝑅) |
Ref | Expression |
---|---|
rrexthaus | ⊢ (𝑅 ∈ ℝExt → 𝐾 ∈ Haus) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rrextnrg 29373 | . . . 4 ⊢ (𝑅 ∈ ℝExt → 𝑅 ∈ NrmRing) | |
2 | nrgngp 22276 | . . . 4 ⊢ (𝑅 ∈ NrmRing → 𝑅 ∈ NrmGrp) | |
3 | ngpxms 22215 | . . . 4 ⊢ (𝑅 ∈ NrmGrp → 𝑅 ∈ ∞MetSp) | |
4 | 1, 2, 3 | 3syl 18 | . . 3 ⊢ (𝑅 ∈ ℝExt → 𝑅 ∈ ∞MetSp) |
5 | rrexthaus.1 | . . . 4 ⊢ 𝐾 = (TopOpen‘𝑅) | |
6 | eqid 2610 | . . . 4 ⊢ (Base‘𝑅) = (Base‘𝑅) | |
7 | eqid 2610 | . . . 4 ⊢ ((dist‘𝑅) ↾ ((Base‘𝑅) × (Base‘𝑅))) = ((dist‘𝑅) ↾ ((Base‘𝑅) × (Base‘𝑅))) | |
8 | 5, 6, 7 | xmstopn 22066 | . . 3 ⊢ (𝑅 ∈ ∞MetSp → 𝐾 = (MetOpen‘((dist‘𝑅) ↾ ((Base‘𝑅) × (Base‘𝑅))))) |
9 | 4, 8 | syl 17 | . 2 ⊢ (𝑅 ∈ ℝExt → 𝐾 = (MetOpen‘((dist‘𝑅) ↾ ((Base‘𝑅) × (Base‘𝑅))))) |
10 | 6, 7 | xmsxmet 22071 | . . 3 ⊢ (𝑅 ∈ ∞MetSp → ((dist‘𝑅) ↾ ((Base‘𝑅) × (Base‘𝑅))) ∈ (∞Met‘(Base‘𝑅))) |
11 | eqid 2610 | . . . 4 ⊢ (MetOpen‘((dist‘𝑅) ↾ ((Base‘𝑅) × (Base‘𝑅)))) = (MetOpen‘((dist‘𝑅) ↾ ((Base‘𝑅) × (Base‘𝑅)))) | |
12 | 11 | methaus 22135 | . . 3 ⊢ (((dist‘𝑅) ↾ ((Base‘𝑅) × (Base‘𝑅))) ∈ (∞Met‘(Base‘𝑅)) → (MetOpen‘((dist‘𝑅) ↾ ((Base‘𝑅) × (Base‘𝑅)))) ∈ Haus) |
13 | 4, 10, 12 | 3syl 18 | . 2 ⊢ (𝑅 ∈ ℝExt → (MetOpen‘((dist‘𝑅) ↾ ((Base‘𝑅) × (Base‘𝑅)))) ∈ Haus) |
14 | 9, 13 | eqeltrd 2688 | 1 ⊢ (𝑅 ∈ ℝExt → 𝐾 ∈ Haus) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1475 ∈ wcel 1977 × cxp 5036 ↾ cres 5040 ‘cfv 5804 Basecbs 15695 distcds 15777 TopOpenctopn 15905 ∞Metcxmt 19552 MetOpencmopn 19557 Hauscha 20922 ∞MetSpcxme 21932 NrmGrpcngp 22192 NrmRingcnrg 22194 ℝExt crrext 29366 |
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 ax-1cn 9873 ax-icn 9874 ax-addcl 9875 ax-addrcl 9876 ax-mulcl 9877 ax-mulrcl 9878 ax-mulcom 9879 ax-addass 9880 ax-mulass 9881 ax-distr 9882 ax-i2m1 9883 ax-1ne0 9884 ax-1rid 9885 ax-rnegex 9886 ax-rrecex 9887 ax-cnre 9888 ax-pre-lttri 9889 ax-pre-lttrn 9890 ax-pre-ltadd 9891 ax-pre-mulgt0 9892 ax-pre-sup 9893 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 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-nel 2783 df-ral 2901 df-rex 2902 df-reu 2903 df-rmo 2904 df-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-pss 3556 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-tp 4130 df-op 4132 df-uni 4373 df-iun 4457 df-br 4584 df-opab 4644 df-mpt 4645 df-tr 4681 df-eprel 4949 df-id 4953 df-po 4959 df-so 4960 df-fr 4997 df-we 4999 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-pred 5597 df-ord 5643 df-on 5644 df-lim 5645 df-suc 5646 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-f1 5809 df-fo 5810 df-f1o 5811 df-fv 5812 df-riota 6511 df-ov 6552 df-oprab 6553 df-mpt2 6554 df-om 6958 df-1st 7059 df-2nd 7060 df-wrecs 7294 df-recs 7355 df-rdg 7393 df-er 7629 df-map 7746 df-en 7842 df-dom 7843 df-sdom 7844 df-sup 8231 df-inf 8232 df-pnf 9955 df-mnf 9956 df-xr 9957 df-ltxr 9958 df-le 9959 df-sub 10147 df-neg 10148 df-div 10564 df-nn 10898 df-2 10956 df-n0 11170 df-z 11255 df-uz 11564 df-q 11665 df-rp 11709 df-xneg 11822 df-xadd 11823 df-xmul 11824 df-icc 12053 df-topgen 15927 df-psmet 19559 df-xmet 19560 df-met 19561 df-bl 19562 df-mopn 19563 df-top 20521 df-bases 20522 df-topon 20523 df-topsp 20524 df-haus 20929 df-xms 21935 df-ms 21936 df-ngp 22198 df-nrg 22200 df-rrext 29371 |
This theorem is referenced by: rrhqima 29386 |
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