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Theorem r19.35 2948
Description: Restricted quantifier version of 19.35 1750. (Contributed by NM, 20-Sep-2003.)
Assertion
Ref Expression
r19.35  |-  ( E. x  e.  A  (
ph  ->  ps )  <->  ( A. x  e.  A  ph  ->  E. x  e.  A  ps ) )

Proof of Theorem r19.35
StepHypRef Expression
1 r19.26 2928 . . . 4  |-  ( A. x  e.  A  ( ph  /\  -.  ps )  <->  ( A. x  e.  A  ph 
/\  A. x  e.  A  -.  ps ) )
2 annim 431 . . . . 5  |-  ( (
ph  /\  -.  ps )  <->  -.  ( ph  ->  ps ) )
32ralbii 2830 . . . 4  |-  ( A. x  e.  A  ( ph  /\  -.  ps )  <->  A. x  e.  A  -.  ( ph  ->  ps )
)
4 df-an 377 . . . 4  |-  ( ( A. x  e.  A  ph 
/\  A. x  e.  A  -.  ps )  <->  -.  ( A. x  e.  A  ph 
->  -.  A. x  e.  A  -.  ps )
)
51, 3, 43bitr3i 283 . . 3  |-  ( A. x  e.  A  -.  ( ph  ->  ps )  <->  -.  ( A. x  e.  A  ph  ->  -.  A. x  e.  A  -.  ps ) )
65con2bii 338 . 2  |-  ( ( A. x  e.  A  ph 
->  -.  A. x  e.  A  -.  ps )  <->  -. 
A. x  e.  A  -.  ( ph  ->  ps ) )
7 dfrex2 2849 . . 3  |-  ( E. x  e.  A  ps  <->  -. 
A. x  e.  A  -.  ps )
87imbi2i 318 . 2  |-  ( ( A. x  e.  A  ph 
->  E. x  e.  A  ps )  <->  ( A. x  e.  A  ph  ->  -.  A. x  e.  A  -.  ps ) )
9 dfrex2 2849 . 2  |-  ( E. x  e.  A  (
ph  ->  ps )  <->  -.  A. x  e.  A  -.  ( ph  ->  ps ) )
106, 8, 93bitr4ri 286 1  |-  ( E. x  e.  A  (
ph  ->  ps )  <->  ( A. x  e.  A  ph  ->  E. x  e.  A  ps ) )
Colors of variables: wff setvar class
Syntax hints:   -. wn 3    -> wi 4    <-> wb 189    /\ wa 375   A.wral 2748   E.wrex 2749
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1679  ax-4 1692
This theorem depends on definitions:  df-bi 190  df-an 377  df-ex 1674  df-ral 2753  df-rex 2754
This theorem is referenced by:  r19.36v  2949  r19.37  2950  r19.43  2957  r19.37zv  3876  r19.36zv  3881  iinexg  4576  bndndx  10896  nmobndseqi  26468  nmobndseqiALT  26469
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