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Theorem r19.30 2686
Description: Theorem 19.30 of [Margaris] p. 90 with restricted quantifiers. (Contributed by Scott Fenton, 25-Feb-2011.)
Assertion
Ref Expression
r19.30  |-  ( A. x  e.  A  ( ph  \/  ps )  -> 
( A. x  e.  A  ph  \/  E. x  e.  A  ps ) )

Proof of Theorem r19.30
StepHypRef Expression
1 ralim 2615 . 2  |-  ( A. x  e.  A  ( -.  ps  ->  ph )  -> 
( A. x  e.  A  -.  ps  ->  A. x  e.  A  ph ) )
2 orcom 378 . . . 4  |-  ( (
ph  \/  ps )  <->  ( ps  \/  ph )
)
3 df-or 361 . . . 4  |-  ( ( ps  \/  ph )  <->  ( -.  ps  ->  ph )
)
42, 3bitri 242 . . 3  |-  ( (
ph  \/  ps )  <->  ( -.  ps  ->  ph )
)
54ralbii 2568 . 2  |-  ( A. x  e.  A  ( ph  \/  ps )  <->  A. x  e.  A  ( -.  ps  ->  ph ) )
6 orcom 378 . . 3  |-  ( ( A. x  e.  A  ph  \/  -.  A. x  e.  A  -.  ps )  <->  ( -.  A. x  e.  A  -.  ps  \/  A. x  e.  A  ph ) )
7 dfrex2 2557 . . . 4  |-  ( E. x  e.  A  ps  <->  -. 
A. x  e.  A  -.  ps )
87orbi2i 507 . . 3  |-  ( ( A. x  e.  A  ph  \/  E. x  e.  A  ps )  <->  ( A. x  e.  A  ph  \/  -.  A. x  e.  A  -.  ps ) )
9 imor 403 . . 3  |-  ( ( A. x  e.  A  -.  ps  ->  A. x  e.  A  ph )  <->  ( -.  A. x  e.  A  -.  ps  \/  A. x  e.  A  ph ) )
106, 8, 93bitr4i 270 . 2  |-  ( ( A. x  e.  A  ph  \/  E. x  e.  A  ps )  <->  ( A. x  e.  A  -.  ps  ->  A. x  e.  A  ph ) )
111, 5, 103imtr4i 259 1  |-  ( A. x  e.  A  ( ph  \/  ps )  -> 
( A. x  e.  A  ph  \/  E. x  e.  A  ps ) )
Colors of variables: wff set class
Syntax hints:   -. wn 5    -> wi 6    \/ wo 359   A.wral 2544   E.wrex 2545
This theorem was proved from axioms:  ax-1 7  ax-2 8  ax-3 9  ax-mp 10  ax-gen 1538  ax-5 1549  ax-17 1608  ax-9 1641  ax-8 1648  ax-11 1719
This theorem depends on definitions:  df-bi 179  df-or 361  df-an 362  df-tru 1315  df-ex 1534  df-nf 1537  df-ral 2549  df-rex 2550
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