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Mirrors > Home > ILE Home > Th. List > ssntr | GIF version |
Description: An open subset of a set is a subset of the set's interior. (Contributed by Jeff Hankins, 31-Aug-2009.) (Revised by Mario Carneiro, 11-Nov-2013.) |
Ref | Expression |
---|---|
clscld.1 | ⊢ 𝑋 = ∪ 𝐽 |
Ref | Expression |
---|---|
ssntr | ⊢ (((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) ∧ (𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆)) → 𝑂 ⊆ ((int‘𝐽)‘𝑆)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elin 3300 | . . . . 5 ⊢ (𝑂 ∈ (𝐽 ∩ 𝒫 𝑆) ↔ (𝑂 ∈ 𝐽 ∧ 𝑂 ∈ 𝒫 𝑆)) | |
2 | elpwg 3561 | . . . . . 6 ⊢ (𝑂 ∈ 𝐽 → (𝑂 ∈ 𝒫 𝑆 ↔ 𝑂 ⊆ 𝑆)) | |
3 | 2 | pm5.32i 450 | . . . . 5 ⊢ ((𝑂 ∈ 𝐽 ∧ 𝑂 ∈ 𝒫 𝑆) ↔ (𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆)) |
4 | 1, 3 | bitr2i 184 | . . . 4 ⊢ ((𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆) ↔ 𝑂 ∈ (𝐽 ∩ 𝒫 𝑆)) |
5 | elssuni 3811 | . . . 4 ⊢ (𝑂 ∈ (𝐽 ∩ 𝒫 𝑆) → 𝑂 ⊆ ∪ (𝐽 ∩ 𝒫 𝑆)) | |
6 | 4, 5 | sylbi 120 | . . 3 ⊢ ((𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆) → 𝑂 ⊆ ∪ (𝐽 ∩ 𝒫 𝑆)) |
7 | 6 | adantl 275 | . 2 ⊢ (((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) ∧ (𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆)) → 𝑂 ⊆ ∪ (𝐽 ∩ 𝒫 𝑆)) |
8 | clscld.1 | . . . 4 ⊢ 𝑋 = ∪ 𝐽 | |
9 | 8 | ntrval 12651 | . . 3 ⊢ ((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) → ((int‘𝐽)‘𝑆) = ∪ (𝐽 ∩ 𝒫 𝑆)) |
10 | 9 | adantr 274 | . 2 ⊢ (((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) ∧ (𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆)) → ((int‘𝐽)‘𝑆) = ∪ (𝐽 ∩ 𝒫 𝑆)) |
11 | 7, 10 | sseqtrrd 3176 | 1 ⊢ (((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) ∧ (𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆)) → 𝑂 ⊆ ((int‘𝐽)‘𝑆)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 = wceq 1342 ∈ wcel 2135 ∩ cin 3110 ⊆ wss 3111 𝒫 cpw 3553 ∪ cuni 3783 ‘cfv 5182 Topctop 12536 intcnt 12634 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-13 2137 ax-14 2138 ax-ext 2146 ax-coll 4091 ax-sep 4094 ax-pow 4147 ax-pr 4181 ax-un 4405 |
This theorem depends on definitions: df-bi 116 df-3an 969 df-tru 1345 df-nf 1448 df-sb 1750 df-eu 2016 df-mo 2017 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-ral 2447 df-rex 2448 df-reu 2449 df-rab 2451 df-v 2723 df-sbc 2947 df-csb 3041 df-un 3115 df-in 3117 df-ss 3124 df-pw 3555 df-sn 3576 df-pr 3577 df-op 3579 df-uni 3784 df-iun 3862 df-br 3977 df-opab 4038 df-mpt 4039 df-id 4265 df-xp 4604 df-rel 4605 df-cnv 4606 df-co 4607 df-dm 4608 df-rn 4609 df-res 4610 df-ima 4611 df-iota 5147 df-fun 5184 df-fn 5185 df-f 5186 df-f1 5187 df-fo 5188 df-f1o 5189 df-fv 5190 df-top 12537 df-ntr 12637 |
This theorem is referenced by: ntrin 12665 neiint 12686 cnntri 12765 |
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