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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 21954 | . 2 ⊢ (𝐽 ∈ Haus → 𝐽 ∈ Fre) | |
2 | nrmreg 22426 | . . . 4 ⊢ ((𝐽 ∈ Nrm ∧ 𝐽 ∈ Fre) → 𝐽 ∈ Reg) | |
3 | 2 | ex 415 | . . 3 ⊢ (𝐽 ∈ Nrm → (𝐽 ∈ Fre → 𝐽 ∈ Reg)) |
4 | t1t0 21950 | . . . 4 ⊢ (𝐽 ∈ Fre → 𝐽 ∈ Kol2) | |
5 | reghaus 22427 | . . . 4 ⊢ (𝐽 ∈ Reg → (𝐽 ∈ Haus ↔ 𝐽 ∈ Kol2)) | |
6 | 4, 5 | syl5ibrcom 249 | . . 3 ⊢ (𝐽 ∈ Fre → (𝐽 ∈ Reg → 𝐽 ∈ Haus)) |
7 | 3, 6 | sylcom 30 | . 2 ⊢ (𝐽 ∈ Nrm → (𝐽 ∈ Fre → 𝐽 ∈ Haus)) |
8 | 1, 7 | impbid2 228 | 1 ⊢ (𝐽 ∈ Nrm → (𝐽 ∈ Haus ↔ 𝐽 ∈ Fre)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∈ wcel 2110 Kol2ct0 21908 Frect1 21909 Hauscha 21910 Regcreg 21911 Nrmcnrm 21912 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-rep 5182 ax-sep 5195 ax-nul 5202 ax-pow 5258 ax-pr 5321 ax-un 7455 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-sbc 3772 df-csb 3883 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4561 df-pr 4563 df-op 4567 df-uni 4832 df-int 4869 df-iun 4913 df-iin 4914 df-br 5059 df-opab 5121 df-mpt 5139 df-id 5454 df-xp 5555 df-rel 5556 df-cnv 5557 df-co 5558 df-dm 5559 df-rn 5560 df-res 5561 df-ima 5562 df-suc 6191 df-iota 6308 df-fun 6351 df-fn 6352 df-f 6353 df-f1 6354 df-fo 6355 df-f1o 6356 df-fv 6357 df-ov 7153 df-oprab 7154 df-mpo 7155 df-1st 7683 df-2nd 7684 df-1o 8096 df-map 8402 df-topgen 16711 df-qtop 16774 df-top 21496 df-topon 21513 df-cld 21621 df-cls 21623 df-cn 21829 df-t0 21915 df-t1 21916 df-haus 21917 df-reg 21918 df-nrm 21919 df-kq 22296 df-hmeo 22357 df-hmph 22358 |
This theorem is referenced by: (None) |
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