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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 3310 | . . . . 5 ⊢ (𝑂 ∈ (𝐽 ∩ 𝒫 𝑆) ↔ (𝑂 ∈ 𝐽 ∧ 𝑂 ∈ 𝒫 𝑆)) | |
2 | elpwg 3574 | . . . . . 6 ⊢ (𝑂 ∈ 𝐽 → (𝑂 ∈ 𝒫 𝑆 ↔ 𝑂 ⊆ 𝑆)) | |
3 | 2 | pm5.32i 451 | . . . . 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 3824 | . . . 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 12904 | . . 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 3186 | 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 1348 ∈ wcel 2141 ∩ cin 3120 ⊆ wss 3121 𝒫 cpw 3566 ∪ cuni 3796 ‘cfv 5198 Topctop 12789 intcnt 12887 |
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 704 ax-5 1440 ax-7 1441 ax-gen 1442 ax-ie1 1486 ax-ie2 1487 ax-8 1497 ax-10 1498 ax-11 1499 ax-i12 1500 ax-bndl 1502 ax-4 1503 ax-17 1519 ax-i9 1523 ax-ial 1527 ax-i5r 1528 ax-13 2143 ax-14 2144 ax-ext 2152 ax-coll 4104 ax-sep 4107 ax-pow 4160 ax-pr 4194 ax-un 4418 |
This theorem depends on definitions: df-bi 116 df-3an 975 df-tru 1351 df-nf 1454 df-sb 1756 df-eu 2022 df-mo 2023 df-clab 2157 df-cleq 2163 df-clel 2166 df-nfc 2301 df-ral 2453 df-rex 2454 df-reu 2455 df-rab 2457 df-v 2732 df-sbc 2956 df-csb 3050 df-un 3125 df-in 3127 df-ss 3134 df-pw 3568 df-sn 3589 df-pr 3590 df-op 3592 df-uni 3797 df-iun 3875 df-br 3990 df-opab 4051 df-mpt 4052 df-id 4278 df-xp 4617 df-rel 4618 df-cnv 4619 df-co 4620 df-dm 4621 df-rn 4622 df-res 4623 df-ima 4624 df-iota 5160 df-fun 5200 df-fn 5201 df-f 5202 df-f1 5203 df-fo 5204 df-f1o 5205 df-fv 5206 df-top 12790 df-ntr 12890 |
This theorem is referenced by: ntrin 12918 neiint 12939 cnntri 13018 |
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