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Theorem vtocl2gf 3119
Description: Implicit substitution of a class for a setvar variable. (Contributed by NM, 25-Apr-1995.)
Hypotheses
Ref Expression
vtocl2gf.1  |-  F/_ x A
vtocl2gf.2  |-  F/_ y A
vtocl2gf.3  |-  F/_ y B
vtocl2gf.4  |-  F/ x ps
vtocl2gf.5  |-  F/ y ch
vtocl2gf.6  |-  ( x  =  A  ->  ( ph 
<->  ps ) )
vtocl2gf.7  |-  ( y  =  B  ->  ( ps 
<->  ch ) )
vtocl2gf.8  |-  ph
Assertion
Ref Expression
vtocl2gf  |-  ( ( A  e.  V  /\  B  e.  W )  ->  ch )

Proof of Theorem vtocl2gf
StepHypRef Expression
1 elex 3068 . 2  |-  ( A  e.  V  ->  A  e.  _V )
2 vtocl2gf.3 . . 3  |-  F/_ y B
3 vtocl2gf.2 . . . . 5  |-  F/_ y A
43nfel1 2580 . . . 4  |-  F/ y  A  e.  _V
5 vtocl2gf.5 . . . 4  |-  F/ y ch
64, 5nfim 1948 . . 3  |-  F/ y ( A  e.  _V  ->  ch )
7 vtocl2gf.7 . . . 4  |-  ( y  =  B  ->  ( ps 
<->  ch ) )
87imbi2d 314 . . 3  |-  ( y  =  B  ->  (
( A  e.  _V  ->  ps )  <->  ( A  e.  _V  ->  ch )
) )
9 vtocl2gf.1 . . . 4  |-  F/_ x A
10 vtocl2gf.4 . . . 4  |-  F/ x ps
11 vtocl2gf.6 . . . 4  |-  ( x  =  A  ->  ( ph 
<->  ps ) )
12 vtocl2gf.8 . . . 4  |-  ph
139, 10, 11, 12vtoclgf 3115 . . 3  |-  ( A  e.  _V  ->  ps )
142, 6, 8, 13vtoclgf 3115 . 2  |-  ( B  e.  W  ->  ( A  e.  _V  ->  ch ) )
151, 14mpan9 467 1  |-  ( ( A  e.  V  /\  B  e.  W )  ->  ch )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    <-> wb 184    /\ wa 367    = wceq 1405   F/wnf 1637    e. wcel 1842   F/_wnfc 2550   _Vcvv 3059
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1639  ax-4 1652  ax-5 1725  ax-6 1771  ax-7 1814  ax-10 1861  ax-11 1866  ax-12 1878  ax-13 2026  ax-ext 2380
This theorem depends on definitions:  df-bi 185  df-an 369  df-tru 1408  df-ex 1634  df-nf 1638  df-sb 1764  df-clab 2388  df-cleq 2394  df-clel 2397  df-nfc 2552  df-v 3061
This theorem is referenced by:  vtocl3gf  3120  vtocl2g  3121  vtocl2gaf  3124  offval22  6863  fmuldfeqlem1  36944
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