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Mirrors > Home > MPE Home > Th. List > reghaus | Structured version Visualization version GIF version |
Description: A regular T0 space is Hausdorff. In other words, a T3 space is T2 . A regular Hausdorff or T0 space is also known as a T3 space. (Contributed by Mario Carneiro, 24-Aug-2015.) |
Ref | Expression |
---|---|
reghaus | ⊢ (𝐽 ∈ Reg → (𝐽 ∈ Haus ↔ 𝐽 ∈ Kol2)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | haust1 23376 | . . 3 ⊢ (𝐽 ∈ Haus → 𝐽 ∈ Fre) | |
2 | t1t0 23372 | . . 3 ⊢ (𝐽 ∈ Fre → 𝐽 ∈ Kol2) | |
3 | 1, 2 | syl 17 | . 2 ⊢ (𝐽 ∈ Haus → 𝐽 ∈ Kol2) |
4 | regr1 23774 | . . . . 5 ⊢ (𝐽 ∈ Reg → (KQ‘𝐽) ∈ Haus) | |
5 | 4 | anim2i 617 | . . . 4 ⊢ ((𝐽 ∈ Kol2 ∧ 𝐽 ∈ Reg) → (𝐽 ∈ Kol2 ∧ (KQ‘𝐽) ∈ Haus)) |
6 | ishaus3 23847 | . . . 4 ⊢ (𝐽 ∈ Haus ↔ (𝐽 ∈ Kol2 ∧ (KQ‘𝐽) ∈ Haus)) | |
7 | 5, 6 | sylibr 234 | . . 3 ⊢ ((𝐽 ∈ Kol2 ∧ 𝐽 ∈ Reg) → 𝐽 ∈ Haus) |
8 | 7 | expcom 413 | . 2 ⊢ (𝐽 ∈ Reg → (𝐽 ∈ Kol2 → 𝐽 ∈ Haus)) |
9 | 3, 8 | impbid2 226 | 1 ⊢ (𝐽 ∈ Reg → (𝐽 ∈ Haus ↔ 𝐽 ∈ Kol2)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∈ wcel 2106 ‘cfv 6563 Kol2ct0 23330 Frect1 23331 Hauscha 23332 Regcreg 23333 KQckq 23717 |
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 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-rep 5285 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-ral 3060 df-rex 3069 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-op 4638 df-uni 4913 df-int 4952 df-iun 4998 df-iin 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-id 5583 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-suc 6392 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-ov 7434 df-oprab 7435 df-mpo 7436 df-1st 8013 df-2nd 8014 df-1o 8505 df-map 8867 df-topgen 17490 df-qtop 17554 df-top 22916 df-topon 22933 df-cld 23043 df-cls 23045 df-cn 23251 df-t0 23337 df-t1 23338 df-haus 23339 df-reg 23340 df-kq 23718 df-hmeo 23779 df-hmph 23780 |
This theorem is referenced by: nrmhaus 23850 |
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