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Theorem abnex 4568
Description: Sufficient condition for a class abstraction to be a proper class. Lemma for snnex 4569 and pwnex 4570. See the comment of abnexg 4567. (Contributed by BJ, 2-May-2021.)
Assertion
Ref Expression
abnex  |-  ( A. x ( F  e.  V  /\  x  e.  F )  ->  -.  { y  |  E. x  y  =  F }  e.  _V )
Distinct variable groups:    x, y    y, F
Allowed substitution hints:    F( x)    V( x, y)

Proof of Theorem abnex
StepHypRef Expression
1 vprc 4242 . 2  |-  -.  _V  e.  _V
2 alral 2587 . . 3  |-  ( A. x ( F  e.  V  /\  x  e.  F )  ->  A. x  e.  _V  ( F  e.  V  /\  x  e.  F ) )
3 rexv 2832 . . . . . . 7  |-  ( E. x  e.  _V  y  =  F  <->  E. x  y  =  F )
43bicomi 132 . . . . . 6  |-  ( E. x  y  =  F  <->  E. x  e.  _V  y  =  F )
54abbii 2348 . . . . 5  |-  { y  |  E. x  y  =  F }  =  { y  |  E. x  e.  _V  y  =  F }
65eleq1i 2298 . . . 4  |-  ( { y  |  E. x  y  =  F }  e.  _V  <->  { y  |  E. x  e.  _V  y  =  F }  e.  _V )
76biimpi 120 . . 3  |-  ( { y  |  E. x  y  =  F }  e.  _V  ->  { y  |  E. x  e.  _V  y  =  F }  e.  _V )
8 abnexg 4567 . . 3  |-  ( A. x  e.  _V  ( F  e.  V  /\  x  e.  F )  ->  ( { y  |  E. x  e.  _V  y  =  F }  e.  _V  ->  _V  e.  _V ) )
92, 7, 8syl2im 38 . 2  |-  ( A. x ( F  e.  V  /\  x  e.  F )  ->  ( { y  |  E. x  y  =  F }  e.  _V  ->  _V  e.  _V ) )
101, 9mtoi 670 1  |-  ( A. x ( F  e.  V  /\  x  e.  F )  ->  -.  { y  |  E. x  y  =  F }  e.  _V )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104   A.wal 1396    = wceq 1398   E.wex 1541    e. wcel 2203   {cab 2218   A.wral 2520   E.wrex 2521   _Vcvv 2813
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-13 2205  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-un 4554
This theorem depends on definitions:  df-bi 117  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ral 2525  df-rex 2526  df-v 2815  df-in 3217  df-ss 3224  df-sn 3695  df-uni 3915  df-iun 3993
This theorem is referenced by:  pwnex  4570
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