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Mirrors > Home > MPE Home > Th. List > nrmhaus | Structured version Visualization version GIF version |
Description: A T1 normal space is Hausdorff. A Hausdorff or T1 normal space is also known as a T4 space. (Contributed by Mario Carneiro, 24-Aug-2015.) |
Ref | Expression |
---|---|
nrmhaus | ⊢ (𝐽 ∈ Nrm → (𝐽 ∈ Haus ↔ 𝐽 ∈ Fre)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | haust1 22856 | . 2 ⊢ (𝐽 ∈ Haus → 𝐽 ∈ Fre) | |
2 | nrmreg 23328 | . . . 4 ⊢ ((𝐽 ∈ Nrm ∧ 𝐽 ∈ Fre) → 𝐽 ∈ Reg) | |
3 | 2 | ex 414 | . . 3 ⊢ (𝐽 ∈ Nrm → (𝐽 ∈ Fre → 𝐽 ∈ Reg)) |
4 | t1t0 22852 | . . . 4 ⊢ (𝐽 ∈ Fre → 𝐽 ∈ Kol2) | |
5 | reghaus 23329 | . . . 4 ⊢ (𝐽 ∈ Reg → (𝐽 ∈ Haus ↔ 𝐽 ∈ Kol2)) | |
6 | 4, 5 | syl5ibrcom 246 | . . 3 ⊢ (𝐽 ∈ Fre → (𝐽 ∈ Reg → 𝐽 ∈ Haus)) |
7 | 3, 6 | sylcom 30 | . 2 ⊢ (𝐽 ∈ Nrm → (𝐽 ∈ Fre → 𝐽 ∈ Haus)) |
8 | 1, 7 | impbid2 225 | 1 ⊢ (𝐽 ∈ Nrm → (𝐽 ∈ Haus ↔ 𝐽 ∈ Fre)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∈ wcel 2107 Kol2ct0 22810 Frect1 22811 Hauscha 22812 Regcreg 22813 Nrmcnrm 22814 |
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 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-ral 3063 df-rex 3072 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-int 4952 df-iun 5000 df-iin 5001 df-br 5150 df-opab 5212 df-mpt 5233 df-id 5575 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-ov 7412 df-oprab 7413 df-mpo 7414 df-1st 7975 df-2nd 7976 df-1o 8466 df-map 8822 df-topgen 17389 df-qtop 17453 df-top 22396 df-topon 22413 df-cld 22523 df-cls 22525 df-cn 22731 df-t0 22817 df-t1 22818 df-haus 22819 df-reg 22820 df-nrm 22821 df-kq 23198 df-hmeo 23259 df-hmph 23260 |
This theorem is referenced by: (None) |
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