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Theorem vtxvalprc 16176
Description: Degenerated case 4 for vertices: The set of vertices of a proper class is the empty set. (Contributed by AV, 12-Oct-2020.)
Assertion
Ref Expression
vtxvalprc  |-  ( C  e/  _V  ->  (Vtx `  C )  =  (/) )

Proof of Theorem vtxvalprc
StepHypRef Expression
1 df-nel 2510 . 2  |-  ( C  e/  _V  <->  -.  C  e.  _V )
2 fvprc 5669 . 2  |-  ( -.  C  e.  _V  ->  (Vtx
`  C )  =  (/) )
31, 2sylbi 121 1  |-  ( C  e/  _V  ->  (Vtx `  C )  =  (/) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    = wceq 1398    e. wcel 2205    e/ wnel 2509   _Vcvv 2815   (/)c0 3512   ` cfv 5357  Vtxcvtx 16133
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 4233  ax-pow 4292  ax-setind 4664
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-nel 2510  df-ral 2527  df-rex 2528  df-v 2817  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-nul 3513  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-br 4115  df-iota 5317  df-fv 5365
This theorem is referenced by:  wlk0prc  16493
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