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Theorem fntopon 20728
Description: The class TopOn is a function with domain  _V. Analogue for topologies of fnmre 16251 for Moore collections. (Contributed by BJ, 29-Apr-2021.)
Assertion
Ref Expression
fntopon  |- TopOn  Fn  _V

Proof of Theorem fntopon
StepHypRef Expression
1 funtopon 20725 . 2  |-  Fun TopOn
2 dmtopon 20727 . 2  |-  dom TopOn  =  _V
3 df-fn 5891 . 2  |-  (TopOn  Fn  _V 
<->  ( Fun TopOn  /\  dom TopOn  =  _V ) )
41, 2, 3mpbir2an 955 1  |- TopOn  Fn  _V
Colors of variables: wff setvar class
Syntax hints:    = wceq 1483   _Vcvv 3200   dom cdm 5114   Fun wfun 5882    Fn wfn 5883  TopOnctopon 20715
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ral 2917  df-rab 2921  df-v 3202  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-fun 5890  df-fn 5891  df-topon 20716
This theorem is referenced by:  toprntopon  20729
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