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| Mirrors > Home > MPE Home > Th. List > resthaus | Structured version Visualization version GIF version | ||
| Description: A subspace of a Hausdorff topology is Hausdorff. (Contributed by Mario Carneiro, 2-Mar-2015.) (Proof shortened by Mario Carneiro, 25-Aug-2015.) |
| Ref | Expression |
|---|---|
| resthaus | ⊢ ((𝐽 ∈ Haus ∧ 𝐴 ∈ 𝑉) → (𝐽 ↾t 𝐴) ∈ Haus) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | haustop 23275 | . 2 ⊢ (𝐽 ∈ Haus → 𝐽 ∈ Top) | |
| 2 | cnhaus 23298 | . 2 ⊢ ((𝐽 ∈ Haus ∧ ( I ↾ (𝐴 ∩ ∪ 𝐽)):(𝐴 ∩ ∪ 𝐽)–1-1→(𝐴 ∩ ∪ 𝐽) ∧ ( I ↾ (𝐴 ∩ ∪ 𝐽)) ∈ ((𝐽 ↾t 𝐴) Cn 𝐽)) → (𝐽 ↾t 𝐴) ∈ Haus) | |
| 3 | 1, 2 | resthauslem 23307 | 1 ⊢ ((𝐽 ∈ Haus ∧ 𝐴 ∈ 𝑉) → (𝐽 ↾t 𝐴) ∈ Haus) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2113 ∩ cin 3900 ∪ cuni 4863 I cid 5518 ↾ cres 5626 (class class class)co 7358 ↾t crest 17340 Hauscha 23252 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-rep 5224 ax-sep 5241 ax-nul 5251 ax-pow 5310 ax-pr 5377 ax-un 7680 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3061 df-reu 3351 df-rab 3400 df-v 3442 df-sbc 3741 df-csb 3850 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-pss 3921 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-int 4903 df-iun 4948 df-br 5099 df-opab 5161 df-mpt 5180 df-tr 5206 df-id 5519 df-eprel 5524 df-po 5532 df-so 5533 df-fr 5577 df-we 5579 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-ov 7361 df-oprab 7362 df-mpo 7363 df-om 7809 df-1st 7933 df-2nd 7934 df-map 8765 df-en 8884 df-fin 8887 df-fi 9314 df-rest 17342 df-topgen 17363 df-top 22838 df-topon 22855 df-bases 22890 df-cn 23171 df-haus 23259 |
| This theorem is referenced by: hauslly 23436 hausnlly 23437 xrge0tsms 24779 cncfcnvcn 24875 xrge0tsmsd 33155 xrge0haus 34101 esumpfinval 34232 esumpfinvalf 34233 |
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