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Theorem fvprc 5642
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 5641 . 2 𝐴 ∈ V → ¬ ∃!𝑥 𝐴𝐹𝑥)
2 tz6.12-2 5639 . 2 (¬ ∃!𝑥 𝐴𝐹𝑥 → (𝐹𝐴) = ∅)
31, 2syl 14 1 𝐴 ∈ V → (𝐹𝐴) = ∅)
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4   = wceq 1398  ∃!weu 2079  wcel 2202  Vcvv 2803  c0 3496   class class class wbr 4093  cfv 5333
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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2205  ax-ext 2213  ax-sep 4212  ax-pow 4270  ax-setind 4641
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ne 2404  df-ral 2516  df-rex 2517  df-v 2805  df-dif 3203  df-un 3205  df-in 3207  df-ss 3214  df-nul 3497  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-uni 3899  df-br 4094  df-iota 5293  df-fv 5341
This theorem is referenced by:  fv2prc  5687  s1prc  11249  vtxvalprc  15979  iedgvalprc  15980
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