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Theorem fvprc 5666
Description: A function's value at a proper class is the empty set. (Contributed by NM, 20-May-1998.)
Assertion
Ref Expression
fvprc  |-  ( -.  A  e.  _V  ->  ( F `  A )  =  (/) )

Proof of Theorem fvprc
Dummy variable  x is distinct from all other variables.
StepHypRef Expression
1 brprcneu 5665 . 2  |-  ( -.  A  e.  _V  ->  -.  E! x  A F x )
2 tz6.12-2 5663 . 2  |-  ( -.  E! x  A F x  ->  ( F `  A )  =  (/) )
31, 2syl 14 1  |-  ( -.  A  e.  _V  ->  ( F `  A )  =  (/) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    = wceq 1398   E!weu 2082    e. wcel 2205   _Vcvv 2815   (/)c0 3510   class class class wbr 4111   ` cfv 5354
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 2208  ax-ext 2216  ax-sep 4230  ax-pow 4289  ax-setind 4661
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-ral 2527  df-rex 2528  df-v 2817  df-dif 3215  df-un 3217  df-in 3219  df-ss 3226  df-nul 3511  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-br 4112  df-iota 5314  df-fv 5362
This theorem is referenced by:  fv2prc  5711  s1prc  11315  vtxvalprc  16067  iedgvalprc  16068
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