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| Mirrors > Home > MPE Home > Th. List > istps2 | Structured version Visualization version GIF version | ||
| Description: Express the predicate "is a topological space." (Contributed by NM, 20-Oct-2012.) |
| Ref | Expression |
|---|---|
| istps.a | ⊢ 𝐴 = (Base‘𝐾) |
| istps.j | ⊢ 𝐽 = (TopOpen‘𝐾) |
| Ref | Expression |
|---|---|
| istps2 | ⊢ (𝐾 ∈ TopSp ↔ (𝐽 ∈ Top ∧ 𝐴 = ∪ 𝐽)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | istps.a | . . 3 ⊢ 𝐴 = (Base‘𝐾) | |
| 2 | istps.j | . . 3 ⊢ 𝐽 = (TopOpen‘𝐾) | |
| 3 | 1, 2 | istps 22909 | . 2 ⊢ (𝐾 ∈ TopSp ↔ 𝐽 ∈ (TopOn‘𝐴)) |
| 4 | istopon 22887 | . 2 ⊢ (𝐽 ∈ (TopOn‘𝐴) ↔ (𝐽 ∈ Top ∧ 𝐴 = ∪ 𝐽)) | |
| 5 | 3, 4 | bitri 275 | 1 ⊢ (𝐾 ∈ TopSp ↔ (𝐽 ∈ Top ∧ 𝐴 = ∪ 𝐽)) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 ∧ wa 395 = wceq 1542 ∈ wcel 2114 ∪ cuni 4851 ‘cfv 6492 Basecbs 17170 TopOpenctopn 17375 Topctop 22868 TopOnctopon 22885 TopSpctps 22907 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5231 ax-nul 5241 ax-pow 5302 ax-pr 5370 ax-un 7682 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-rab 3391 df-v 3432 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-mpt 5168 df-id 5519 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-iota 6448 df-fun 6494 df-fv 6500 df-top 22869 df-topon 22886 df-topsp 22908 |
| This theorem is referenced by: tpsuni 22911 tpstop 22912 istpsi 22917 |
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