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| Mirrors > Home > MPE Home > Th. List > restt0 | Structured version Visualization version GIF version | ||
| Description: A subspace of a T0 topology is T0. (Contributed by Mario Carneiro, 25-Aug-2015.) |
| Ref | Expression |
|---|---|
| restt0 | ⊢ ((𝐽 ∈ Kol2 ∧ 𝐴 ∈ 𝑉) → (𝐽 ↾t 𝐴) ∈ Kol2) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | t0top 23555 | . 2 ⊢ (𝐽 ∈ Kol2 → 𝐽 ∈ Top) | |
| 2 | cnt0 23572 | . 2 ⊢ ((𝐽 ∈ Kol2 ∧ ( I ↾ (𝐴 ∩ ∪ 𝐽)):(𝐴 ∩ ∪ 𝐽)–1-1→(𝐴 ∩ ∪ 𝐽) ∧ ( I ↾ (𝐴 ∩ ∪ 𝐽)) ∈ ((𝐽 ↾t 𝐴) Cn 𝐽)) → (𝐽 ↾t 𝐴) ∈ Kol2) | |
| 3 | 1, 2 | resthauslem 23589 | 1 ⊢ ((𝐽 ∈ Kol2 ∧ 𝐴 ∈ 𝑉) → (𝐽 ↾t 𝐴) ∈ Kol2) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∈ wcel 2145 ∩ cin 3898 ∪ cuni 4867 I cid 5549 ↾ cres 5657 (class class class)co 7414 ↾t crest 17506 Kol2ct0 23532 |
| 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 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-rep 5232 ax-sep 5251 ax-nul 5263 ax-pow 5330 ax-pr 5398 ax-un 7737 |
| 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 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-int 4908 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-ov 7417 df-oprab 7418 df-mpo 7419 df-om 7864 df-1st 7987 df-2nd 7988 df-map 8829 df-en 8954 df-fin 8957 df-fi 9382 df-rest 17508 df-topgen 17529 df-top 23120 df-topon 23137 df-bases 23172 df-cn 23453 df-t0 23539 |
| This theorem is used by: (None) |
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