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Mirrors > Home > MPE Home > Th. List > tgpt1 | Structured version Visualization version GIF version |
Description: Hausdorff and T1 are equivalent for topological groups. (Contributed by Mario Carneiro, 18-Sep-2015.) |
Ref | Expression |
---|---|
tgpt1.j | ⊢ 𝐽 = (TopOpen‘𝐺) |
Ref | Expression |
---|---|
tgpt1 | ⊢ (𝐺 ∈ TopGrp → (𝐽 ∈ Haus ↔ 𝐽 ∈ Fre)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | haust1 22411 | . 2 ⊢ (𝐽 ∈ Haus → 𝐽 ∈ Fre) | |
2 | tgpgrp 23137 | . . . . . 6 ⊢ (𝐺 ∈ TopGrp → 𝐺 ∈ Grp) | |
3 | eqid 2738 | . . . . . . 7 ⊢ (Base‘𝐺) = (Base‘𝐺) | |
4 | eqid 2738 | . . . . . . 7 ⊢ (0g‘𝐺) = (0g‘𝐺) | |
5 | 3, 4 | grpidcl 18522 | . . . . . 6 ⊢ (𝐺 ∈ Grp → (0g‘𝐺) ∈ (Base‘𝐺)) |
6 | 2, 5 | syl 17 | . . . . 5 ⊢ (𝐺 ∈ TopGrp → (0g‘𝐺) ∈ (Base‘𝐺)) |
7 | tgpt1.j | . . . . . . 7 ⊢ 𝐽 = (TopOpen‘𝐺) | |
8 | 7, 3 | tgptopon 23141 | . . . . . 6 ⊢ (𝐺 ∈ TopGrp → 𝐽 ∈ (TopOn‘(Base‘𝐺))) |
9 | toponuni 21971 | . . . . . 6 ⊢ (𝐽 ∈ (TopOn‘(Base‘𝐺)) → (Base‘𝐺) = ∪ 𝐽) | |
10 | 8, 9 | syl 17 | . . . . 5 ⊢ (𝐺 ∈ TopGrp → (Base‘𝐺) = ∪ 𝐽) |
11 | 6, 10 | eleqtrd 2841 | . . . 4 ⊢ (𝐺 ∈ TopGrp → (0g‘𝐺) ∈ ∪ 𝐽) |
12 | eqid 2738 | . . . . . 6 ⊢ ∪ 𝐽 = ∪ 𝐽 | |
13 | 12 | t1sncld 22385 | . . . . 5 ⊢ ((𝐽 ∈ Fre ∧ (0g‘𝐺) ∈ ∪ 𝐽) → {(0g‘𝐺)} ∈ (Clsd‘𝐽)) |
14 | 13 | expcom 413 | . . . 4 ⊢ ((0g‘𝐺) ∈ ∪ 𝐽 → (𝐽 ∈ Fre → {(0g‘𝐺)} ∈ (Clsd‘𝐽))) |
15 | 11, 14 | syl 17 | . . 3 ⊢ (𝐺 ∈ TopGrp → (𝐽 ∈ Fre → {(0g‘𝐺)} ∈ (Clsd‘𝐽))) |
16 | 4, 7 | tgphaus 23176 | . . 3 ⊢ (𝐺 ∈ TopGrp → (𝐽 ∈ Haus ↔ {(0g‘𝐺)} ∈ (Clsd‘𝐽))) |
17 | 15, 16 | sylibrd 258 | . 2 ⊢ (𝐺 ∈ TopGrp → (𝐽 ∈ Fre → 𝐽 ∈ Haus)) |
18 | 1, 17 | impbid2 225 | 1 ⊢ (𝐺 ∈ TopGrp → (𝐽 ∈ Haus ↔ 𝐽 ∈ Fre)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 = wceq 1539 ∈ wcel 2108 {csn 4558 ∪ cuni 4836 ‘cfv 6418 Basecbs 16840 TopOpenctopn 17049 0gc0g 17067 Grpcgrp 18492 TopOnctopon 21967 Clsdccld 22075 Frect1 22366 Hauscha 22367 TopGrpctgp 23130 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-ral 3068 df-rex 3069 df-reu 3070 df-rmo 3071 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4837 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-id 5480 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-fo 6424 df-fv 6426 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-1st 7804 df-2nd 7805 df-map 8575 df-0g 17069 df-topgen 17071 df-plusf 18240 df-mgm 18241 df-sgrp 18290 df-mnd 18301 df-grp 18495 df-minusg 18496 df-sbg 18497 df-top 21951 df-topon 21968 df-topsp 21990 df-bases 22004 df-cld 22078 df-cn 22286 df-t1 22373 df-haus 22374 df-tx 22621 df-tmd 23131 df-tgp 23132 |
This theorem is referenced by: tgpt0 23178 |
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