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| Mirrors > Home > ILE Home > Th. List > ntrtop | GIF version | ||
| Description: The interior of a topology's underlying set is the entire set. (Contributed by NM, 12-Sep-2006.) |
| Ref | Expression |
|---|---|
| clscld.1 | ⊢ 𝑋 = ∪ 𝐽 |
| Ref | Expression |
|---|---|
| ntrtop | ⊢ (𝐽 ∈ Top → ((int‘𝐽)‘𝑋) = 𝑋) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | clscld.1 | . . 3 ⊢ 𝑋 = ∪ 𝐽 | |
| 2 | 1 | topopn 14244 | . 2 ⊢ (𝐽 ∈ Top → 𝑋 ∈ 𝐽) |
| 3 | ssid 3203 | . . 3 ⊢ 𝑋 ⊆ 𝑋 | |
| 4 | 1 | isopn3 14361 | . . 3 ⊢ ((𝐽 ∈ Top ∧ 𝑋 ⊆ 𝑋) → (𝑋 ∈ 𝐽 ↔ ((int‘𝐽)‘𝑋) = 𝑋)) |
| 5 | 3, 4 | mpan2 425 | . 2 ⊢ (𝐽 ∈ Top → (𝑋 ∈ 𝐽 ↔ ((int‘𝐽)‘𝑋) = 𝑋)) |
| 6 | 2, 5 | mpbid 147 | 1 ⊢ (𝐽 ∈ Top → ((int‘𝐽)‘𝑋) = 𝑋) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ↔ wb 105 = wceq 1364 ∈ wcel 2167 ⊆ wss 3157 ∪ cuni 3839 ‘cfv 5258 Topctop 14233 intcnt 14329 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-13 2169 ax-14 2170 ax-ext 2178 ax-coll 4148 ax-sep 4151 ax-pow 4207 ax-pr 4242 ax-un 4468 |
| This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1367 df-nf 1475 df-sb 1777 df-eu 2048 df-mo 2049 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-ral 2480 df-rex 2481 df-reu 2482 df-rab 2484 df-v 2765 df-sbc 2990 df-csb 3085 df-un 3161 df-in 3163 df-ss 3170 df-pw 3607 df-sn 3628 df-pr 3629 df-op 3631 df-uni 3840 df-iun 3918 df-br 4034 df-opab 4095 df-mpt 4096 df-id 4328 df-xp 4669 df-rel 4670 df-cnv 4671 df-co 4672 df-dm 4673 df-rn 4674 df-res 4675 df-ima 4676 df-iota 5219 df-fun 5260 df-fn 5261 df-f 5262 df-f1 5263 df-fo 5264 df-f1o 5265 df-fv 5266 df-top 14234 df-ntr 14332 |
| This theorem is referenced by: dvidlemap 14927 dvidrelem 14928 dveflem 14962 |
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