Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > ntropn | Structured version Visualization version GIF version |
Description: The interior of a subset of a topology's underlying set is open. (Contributed by NM, 11-Sep-2006.) (Revised by Mario Carneiro, 11-Nov-2013.) |
Ref | Expression |
---|---|
clscld.1 | ⊢ 𝑋 = ∪ 𝐽 |
Ref | Expression |
---|---|
ntropn | ⊢ ((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) → ((int‘𝐽)‘𝑆) ∈ 𝐽) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | clscld.1 | . . 3 ⊢ 𝑋 = ∪ 𝐽 | |
2 | 1 | ntrval 22095 | . 2 ⊢ ((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) → ((int‘𝐽)‘𝑆) = ∪ (𝐽 ∩ 𝒫 𝑆)) |
3 | inss1 4159 | . . . 4 ⊢ (𝐽 ∩ 𝒫 𝑆) ⊆ 𝐽 | |
4 | uniopn 21954 | . . . 4 ⊢ ((𝐽 ∈ Top ∧ (𝐽 ∩ 𝒫 𝑆) ⊆ 𝐽) → ∪ (𝐽 ∩ 𝒫 𝑆) ∈ 𝐽) | |
5 | 3, 4 | mpan2 687 | . . 3 ⊢ (𝐽 ∈ Top → ∪ (𝐽 ∩ 𝒫 𝑆) ∈ 𝐽) |
6 | 5 | adantr 480 | . 2 ⊢ ((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) → ∪ (𝐽 ∩ 𝒫 𝑆) ∈ 𝐽) |
7 | 2, 6 | eqeltrd 2839 | 1 ⊢ ((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) → ((int‘𝐽)‘𝑆) ∈ 𝐽) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 395 = wceq 1539 ∈ wcel 2108 ∩ cin 3882 ⊆ wss 3883 𝒫 cpw 4530 ∪ cuni 4836 ‘cfv 6418 Topctop 21950 intcnt 22076 |
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-rep 5205 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-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-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-top 21951 df-ntr 22079 |
This theorem is referenced by: ntrval2 22110 ntrss3 22119 ntrin 22120 cmclsopn 22121 cmntrcld 22122 isopn3 22125 ntridm 22127 neiint 22163 topssnei 22183 maxlp 22206 restntr 22241 iscnp4 22322 cnntri 22330 cnprest 22348 llycmpkgen2 22609 xkococnlem 22718 flimopn 23034 fclsneii 23076 fcfnei 23094 subgntr 23166 iccntr 23890 rectbntr0 23901 bcthlem5 24397 bcth3 24400 limcflf 24950 perfdvf 24972 ubthlem1 29133 cvmlift2lem12 33176 opnregcld 34446 ntrrn 41621 toplatglb 46175 |
Copyright terms: Public domain | W3C validator |