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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 7443 | . 2 ⊢ ((TopSet‘𝑤) ↾t (Base‘𝑤)) ∈ V | |
| 2 | df-topn 17480 | . 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 3455 Fn wfn 6531 ‘cfv 6536 (class class class)co 7410 Basecbs 17273 TopSetcts 17320 ↾t crest 17477 TopOpenctopn 17478 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-sep 5257 ax-nul 5269 ax-pr 5404 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-ral 3080 df-rex 3090 df-rab 3417 df-v 3457 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-nul 4287 df-if 4488 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4873 df-br 5110 df-opab 5174 df-mpt 5193 df-id 5556 df-xp 5667 df-rel 5668 df-cnv 5669 df-co 5670 df-dm 5671 df-iota 6492 df-fun 6538 df-fn 6539 df-fv 6544 df-ov 7413 df-topn 17480 |
| This theorem is used by: prdstopn 23794 prdstps 23795 xpstopnlem2 23977 prdstmdd 24290 prdstgpd 24291 prdsxmslem2 24695 |
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