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Theorem funtopon 12074
Description: The class TopOn is a function. (Contributed by BJ, 29-Apr-2021.)
Assertion
Ref Expression
funtopon Fun TopOn

Proof of Theorem funtopon
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-topon 12073 . 2 TopOn = (𝑦 ∈ V ↦ {𝑥 ∈ Top ∣ 𝑦 = 𝑥})
21funmpt2 5130 1 Fun TopOn
Colors of variables: wff set class
Syntax hints:   = wceq 1314  {crab 2395  Vcvv 2658   cuni 3704  Fun wfun 5085  Topctop 12059  TopOnctopon 12072
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 681  ax-5 1406  ax-7 1407  ax-gen 1408  ax-ie1 1452  ax-ie2 1453  ax-8 1465  ax-10 1466  ax-11 1467  ax-i12 1468  ax-bndl 1469  ax-4 1470  ax-14 1475  ax-17 1489  ax-i9 1493  ax-ial 1497  ax-i5r 1498  ax-ext 2097  ax-sep 4014  ax-pow 4066  ax-pr 4099
This theorem depends on definitions:  df-bi 116  df-3an 947  df-tru 1317  df-nf 1420  df-sb 1719  df-eu 1978  df-mo 1979  df-clab 2102  df-cleq 2108  df-clel 2111  df-nfc 2245  df-ral 2396  df-rex 2397  df-v 2660  df-un 3043  df-in 3045  df-ss 3052  df-pw 3480  df-sn 3501  df-pr 3502  df-op 3504  df-br 3898  df-opab 3958  df-mpt 3959  df-id 4183  df-xp 4513  df-rel 4514  df-cnv 4515  df-co 4516  df-fun 5093  df-topon 12073
This theorem is referenced by:  istopon  12075  fntopon  12086
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