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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 23538 | . 2 ⊢ (𝐽 ∈ Haus → 𝐽 ∈ Top) | |
| 2 | cnhaus 23561 | . 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 23570 | 1 ⊢ ((𝐽 ∈ Haus ∧ 𝐴 ∈ 𝑉) → (𝐽 ↾t 𝐴) ∈ Haus) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∈ wcel 2146 ∩ cin 3905 ∪ cuni 4874 I cid 5557 ↾ cres 5665 (class class class)co 7419 ↾t crest 17495 Hauscha 23515 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-rep 5240 ax-sep 5259 ax-nul 5271 ax-pow 5338 ax-pr 5406 ax-un 7742 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-ral 3082 df-rex 3092 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-int 4915 df-iun 4960 df-br 5112 df-opab 5176 df-mpt 5195 df-tr 5221 df-id 5558 df-eprel 5563 df-po 5571 df-so 5572 df-fr 5616 df-we 5618 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-ov 7422 df-oprab 7423 df-mpo 7424 df-om 7869 df-1st 7992 df-2nd 7993 df-map 8832 df-en 8950 df-fin 8953 df-fi 9378 df-rest 17497 df-topgen 17518 df-top 23101 df-topon 23118 df-bases 23153 df-cn 23434 df-haus 23522 |
| This theorem is used by: hauslly 23700 hausnlly 23701 xrge0tsms 25043 cncfcnvcn 25135 xrge0tsmsd 33457 xrge0haus 34398 esumpfinval 34529 esumpfinvalf 34530 |
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