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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 22249 | . 2 ⊢ (𝐽 ∈ Haus → 𝐽 ∈ Fre) | |
2 | nrmreg 22721 | . . . 4 ⊢ ((𝐽 ∈ Nrm ∧ 𝐽 ∈ Fre) → 𝐽 ∈ Reg) | |
3 | 2 | ex 416 | . . 3 ⊢ (𝐽 ∈ Nrm → (𝐽 ∈ Fre → 𝐽 ∈ Reg)) |
4 | t1t0 22245 | . . . 4 ⊢ (𝐽 ∈ Fre → 𝐽 ∈ Kol2) | |
5 | reghaus 22722 | . . . 4 ⊢ (𝐽 ∈ Reg → (𝐽 ∈ Haus ↔ 𝐽 ∈ Kol2)) | |
6 | 4, 5 | syl5ibrcom 250 | . . 3 ⊢ (𝐽 ∈ Fre → (𝐽 ∈ Reg → 𝐽 ∈ Haus)) |
7 | 3, 6 | sylcom 30 | . 2 ⊢ (𝐽 ∈ Nrm → (𝐽 ∈ Fre → 𝐽 ∈ Haus)) |
8 | 1, 7 | impbid2 229 | 1 ⊢ (𝐽 ∈ Nrm → (𝐽 ∈ Haus ↔ 𝐽 ∈ Fre)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∈ wcel 2110 Kol2ct0 22203 Frect1 22204 Hauscha 22205 Regcreg 22206 Nrmcnrm 22207 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2016 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2158 ax-12 2175 ax-ext 2708 ax-rep 5179 ax-sep 5192 ax-nul 5199 ax-pow 5258 ax-pr 5322 ax-un 7523 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2071 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2886 df-ne 2941 df-ral 3066 df-rex 3067 df-reu 3068 df-rab 3070 df-v 3410 df-sbc 3695 df-csb 3812 df-dif 3869 df-un 3871 df-in 3873 df-ss 3883 df-nul 4238 df-if 4440 df-pw 4515 df-sn 4542 df-pr 4544 df-op 4548 df-uni 4820 df-int 4860 df-iun 4906 df-iin 4907 df-br 5054 df-opab 5116 df-mpt 5136 df-id 5455 df-xp 5557 df-rel 5558 df-cnv 5559 df-co 5560 df-dm 5561 df-rn 5562 df-res 5563 df-ima 5564 df-suc 6219 df-iota 6338 df-fun 6382 df-fn 6383 df-f 6384 df-f1 6385 df-fo 6386 df-f1o 6387 df-fv 6388 df-ov 7216 df-oprab 7217 df-mpo 7218 df-1st 7761 df-2nd 7762 df-1o 8202 df-map 8510 df-topgen 16948 df-qtop 17012 df-top 21791 df-topon 21808 df-cld 21916 df-cls 21918 df-cn 22124 df-t0 22210 df-t1 22211 df-haus 22212 df-reg 22213 df-nrm 22214 df-kq 22591 df-hmeo 22652 df-hmph 22653 |
This theorem is referenced by: (None) |
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