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Theorem fvprc 5564
Description: A function's value at a proper class is the empty set. (Contributed by NM, 20-May-1998.)
Assertion
Ref Expression
fvprc 𝐴 ∈ V → (𝐹𝐴) = ∅)

Proof of Theorem fvprc
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 brprcneu 5563 . 2 𝐴 ∈ V → ¬ ∃!𝑥 𝐴𝐹𝑥)
2 tz6.12-2 5561 . 2 (¬ ∃!𝑥 𝐴𝐹𝑥 → (𝐹𝐴) = ∅)
31, 2syl 14 1 𝐴 ∈ V → (𝐹𝐴) = ∅)
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4   = wceq 1372  ∃!weu 2053  wcel 2175  Vcvv 2771  c0 3459   class class class wbr 4043  cfv 5268
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 615  ax-in2 616  ax-io 710  ax-5 1469  ax-7 1470  ax-gen 1471  ax-ie1 1515  ax-ie2 1516  ax-8 1526  ax-10 1527  ax-11 1528  ax-i12 1529  ax-bndl 1531  ax-4 1532  ax-17 1548  ax-i9 1552  ax-ial 1556  ax-i5r 1557  ax-14 2178  ax-ext 2186  ax-sep 4161  ax-pow 4217  ax-setind 4583
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1375  df-fal 1378  df-nf 1483  df-sb 1785  df-eu 2056  df-mo 2057  df-clab 2191  df-cleq 2197  df-clel 2200  df-nfc 2336  df-ne 2376  df-ral 2488  df-rex 2489  df-v 2773  df-dif 3167  df-un 3169  df-in 3171  df-ss 3178  df-nul 3460  df-pw 3617  df-sn 3638  df-pr 3639  df-op 3641  df-uni 3850  df-br 4044  df-iota 5229  df-fv 5276
This theorem is referenced by:  fv2prc  5607
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