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| Mirrors > Home > MPE Home > Th. List > topnfn | Structured version Visualization version GIF version | ||
| Description: The topology extractor function is a function on the universe. (Contributed by Mario Carneiro, 13-Aug-2015.) |
| Ref | Expression |
|---|---|
| topnfn | ⊢ TopOpen Fn V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ovex 7449 | . 2 ⊢ ((TopSet‘𝑤) ↾t (Base‘𝑤)) ∈ V | |
| 2 | df-topn 17533 | . 2 ⊢ TopOpen = (𝑤 ∈ V ↦ ((TopSet‘𝑤) ↾t (Base‘𝑤))) | |
| 3 | 1, 2 | fnmpti 6678 | 1 ⊢ TopOpen Fn V |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: Vcvv 3450 Fn wfn 6530 ‘cfv 6535 (class class class)co 7416 Basecbs 17326 TopSetcts 17373 ↾t crest 17530 TopOpenctopn 17531 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5251 ax-nul 5263 ax-pr 5398 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-mpt 5187 df-id 5550 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-iota 6491 df-fun 6537 df-fn 6538 df-fv 6543 df-ov 7419 df-topn 17533 |
| This theorem is used by: prdstopn 23886 prdstps 23887 xpstopnlem2 24069 prdstmdd 24382 prdstgpd 24383 prdsxmslem2 24787 |
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