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Theorem abnex 4538
Description: Sufficient condition for a class abstraction to be a proper class. Lemma for snnex 4539 and pwnex 4540. See the comment of abnexg 4537. (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 4216 . 2  |-  -.  _V  e.  _V
2 alral 2575 . . 3  |-  ( A. x ( F  e.  V  /\  x  e.  F )  ->  A. x  e.  _V  ( F  e.  V  /\  x  e.  F ) )
3 rexv 2818 . . . . . . 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 2345 . . . . 5  |-  { y  |  E. x  y  =  F }  =  { y  |  E. x  e.  _V  y  =  F }
65eleq1i 2295 . . . 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 4537 . . 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 668 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 1393    = wceq 1395   E.wex 1538    e. wcel 2200   {cab 2215   A.wral 2508   E.wrex 2509   _Vcvv 2799
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 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4202  ax-un 4524
This theorem depends on definitions:  df-bi 117  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-v 2801  df-in 3203  df-ss 3210  df-sn 3672  df-uni 3889  df-iun 3967
This theorem is referenced by:  pwnex  4540
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