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Theorem encv 6814
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 6812 . 2  |-  Rel  ~~
2 brrelex12 4702 . 2  |-  ( ( Rel  ~~  /\  A  ~~  B )  ->  ( A  e.  _V  /\  B  e.  _V ) )
31, 2mpan 424 1  |-  ( A 
~~  B  ->  ( A  e.  _V  /\  B  e.  _V ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    e. wcel 2167   _Vcvv 2763   class class class wbr 4034   Rel wrel 4669    ~~ cen 6806
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-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-14 2170  ax-ext 2178  ax-sep 4152  ax-pow 4208  ax-pr 4243
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ral 2480  df-rex 2481  df-v 2765  df-un 3161  df-in 3163  df-ss 3170  df-pw 3608  df-sn 3629  df-pr 3630  df-op 3632  df-br 4035  df-opab 4096  df-xp 4670  df-rel 4671  df-en 6809
This theorem is referenced by:  bren  6815  en1uniel  6872  cardcl  7259  isnumi  7260  cardval3ex  7263  djuen  7294  ccfunen  7347
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