ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  ralm Unicode version

Theorem ralm 3519
Description: Inhabited classes and restricted quantification. (Contributed by Jim Kingdon, 6-Aug-2018.)
Assertion
Ref Expression
ralm  |-  ( ( E. x  x  e.  A  ->  A. x  e.  A  ph )  <->  A. x  e.  A  ph )

Proof of Theorem ralm
StepHypRef Expression
1 df-ral 2453 . . . . . 6  |-  ( A. x  e.  A  ph  <->  A. x
( x  e.  A  ->  ph ) )
21imbi2i 225 . . . . 5  |-  ( ( E. x  x  e.  A  ->  A. x  e.  A  ph )  <->  ( E. x  x  e.  A  ->  A. x ( x  e.  A  ->  ph )
) )
3 19.38 1669 . . . . 5  |-  ( ( E. x  x  e.  A  ->  A. x
( x  e.  A  ->  ph ) )  ->  A. x ( x  e.  A  ->  ( x  e.  A  ->  ph )
) )
42, 3sylbi 120 . . . 4  |-  ( ( E. x  x  e.  A  ->  A. x  e.  A  ph )  ->  A. x ( x  e.  A  ->  ( x  e.  A  ->  ph )
) )
5 pm2.43 53 . . . . 5  |-  ( ( x  e.  A  -> 
( x  e.  A  ->  ph ) )  -> 
( x  e.  A  ->  ph ) )
65alimi 1448 . . . 4  |-  ( A. x ( x  e.  A  ->  ( x  e.  A  ->  ph )
)  ->  A. x
( x  e.  A  ->  ph ) )
74, 6syl 14 . . 3  |-  ( ( E. x  x  e.  A  ->  A. x  e.  A  ph )  ->  A. x ( x  e.  A  ->  ph ) )
87, 1sylibr 133 . 2  |-  ( ( E. x  x  e.  A  ->  A. x  e.  A  ph )  ->  A. x  e.  A  ph )
9 ax-1 6 . 2  |-  ( A. x  e.  A  ph  ->  ( E. x  x  e.  A  ->  A. x  e.  A  ph ) )
108, 9impbii 125 1  |-  ( ( E. x  x  e.  A  ->  A. x  e.  A  ph )  <->  A. x  e.  A  ph )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 104   A.wal 1346   E.wex 1485    e. wcel 2141   A.wral 2448
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-5 1440  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-4 1503  ax-ial 1527  ax-i5r 1528
This theorem depends on definitions:  df-bi 116  df-ral 2453
This theorem is referenced by:  raaan  3521
  Copyright terms: Public domain W3C validator