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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 7473 | . 2 ⊢ ((TopSet‘𝑤) ↾t (Base‘𝑤)) ∈ V | |
| 2 | df-topn 17620 | . 2 ⊢ TopOpen = (𝑤 ∈ V ↦ ((TopSet‘𝑤) ↾t (Base‘𝑤))) | |
| 3 | 1, 2 | fnmpti 6701 | 1 ⊢ TopOpen Fn V |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: Vcvv 3454 Fn wfn 6550 ‘cfv 6555 (class class class)co 7440 Basecbs 17413 TopSetcts 17460 ↾t crest 17617 TopOpenctopn 17618 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5252 ax-nul 5263 ax-pr 5395 |
| 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 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3081 df-rex 3091 df-rab 3417 df-v 3456 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-br 5107 df-opab 5171 df-mpt 5190 df-id 5550 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-iota 6509 df-fun 6557 df-fn 6558 df-fv 6563 df-ov 7443 df-topn 17620 |
| This theorem is used by: prdstopn 23974 prdstps 23975 xpstopnlem2 24157 prdstmdd 24470 prdstgpd 24471 prdsxmslem2 24875 |
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