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Theorem topnfn 16935
Description: The topology extractor function is a function on the universe. (Contributed by Mario Carneiro, 13-Aug-2015.)
Assertion
Ref Expression
topnfn TopOpen Fn V

Proof of Theorem topnfn
StepHypRef Expression
1 ovex 7251 . 2 ((TopSet‘𝑤) ↾t (Base‘𝑤)) ∈ V
2 df-topn 16933 . 2 TopOpen = (𝑤 ∈ V ↦ ((TopSet‘𝑤) ↾t (Base‘𝑤)))
31, 2fnmpti 6526 1 TopOpen Fn V
Colors of variables: wff setvar class
Syntax hints:  Vcvv 3413   Fn wfn 6380  cfv 6385  (class class class)co 7218  Basecbs 16765  TopSetcts 16813  t crest 16930  TopOpenctopn 16931
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1976  ax-7 2016  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2158  ax-12 2175  ax-ext 2708  ax-sep 5197  ax-nul 5204  ax-pr 5327
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 848  df-3an 1091  df-tru 1546  df-fal 1556  df-ex 1788  df-nf 1792  df-sb 2071  df-mo 2539  df-eu 2568  df-clab 2715  df-cleq 2729  df-clel 2816  df-nfc 2886  df-ral 3066  df-rex 3067  df-rab 3070  df-v 3415  df-dif 3874  df-un 3876  df-in 3878  df-ss 3888  df-nul 4243  df-if 4445  df-sn 4547  df-pr 4549  df-op 4553  df-uni 4825  df-br 5059  df-opab 5121  df-mpt 5141  df-id 5460  df-xp 5562  df-rel 5563  df-cnv 5564  df-co 5565  df-dm 5566  df-iota 6343  df-fun 6387  df-fn 6388  df-fv 6393  df-ov 7221  df-topn 16933
This theorem is referenced by:  prdstopn  22530  prdstps  22531  xpstopnlem2  22713  prdstmdd  23026  prdstgpd  23027  prdsxmslem2  23432
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