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Theorem encv 6703
Description: If two classes are equinumerous, both classes are sets. (Contributed by AV, 21-Mar-2019.)
Assertion
Ref Expression
encv  |-  ( A 
~~  B  ->  ( A  e.  _V  /\  B  e.  _V ) )

Proof of Theorem encv
StepHypRef Expression
1 relen 6701 . 2  |-  Rel  ~~
2 brrelex12 4636 . 2  |-  ( ( Rel  ~~  /\  A  ~~  B )  ->  ( A  e.  _V  /\  B  e.  _V ) )
31, 2mpan 421 1  |-  ( A 
~~  B  ->  ( A  e.  _V  /\  B  e.  _V ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    e. wcel 2135   _Vcvv 2721   class class class wbr 3976   Rel wrel 4603    ~~ cen 6695
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 699  ax-5 1434  ax-7 1435  ax-gen 1436  ax-ie1 1480  ax-ie2 1481  ax-8 1491  ax-10 1492  ax-11 1493  ax-i12 1494  ax-bndl 1496  ax-4 1497  ax-17 1513  ax-i9 1517  ax-ial 1521  ax-i5r 1522  ax-14 2138  ax-ext 2146  ax-sep 4094  ax-pow 4147  ax-pr 4181
This theorem depends on definitions:  df-bi 116  df-3an 969  df-tru 1345  df-nf 1448  df-sb 1750  df-clab 2151  df-cleq 2157  df-clel 2160  df-nfc 2295  df-ral 2447  df-rex 2448  df-v 2723  df-un 3115  df-in 3117  df-ss 3124  df-pw 3555  df-sn 3576  df-pr 3577  df-op 3579  df-br 3977  df-opab 4038  df-xp 4604  df-rel 4605  df-en 6698
This theorem is referenced by:  bren  6704  en1uniel  6761  cardcl  7128  isnumi  7129  cardval3ex  7132  djuen  7158  ccfunen  7196
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