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Theorem reximdai 2806
Description: Deduction from Theorem 19.22 of [Margaris] p. 90. (Restricted quantifier version.) (Contributed by NM, 31-Aug-1999.)
Hypotheses
Ref Expression
reximdai.1  |-  F/ x ph
reximdai.2  |-  ( ph  ->  ( x  e.  A  ->  ( ps  ->  ch ) ) )
Assertion
Ref Expression
reximdai  |-  ( ph  ->  ( E. x  e.  A  ps  ->  E. x  e.  A  ch )
)

Proof of Theorem reximdai
StepHypRef Expression
1 reximdai.1 . . 3  |-  F/ x ph
2 reximdai.2 . . 3  |-  ( ph  ->  ( x  e.  A  ->  ( ps  ->  ch ) ) )
31, 2ralrimi 2779 . 2  |-  ( ph  ->  A. x  e.  A  ( ps  ->  ch )
)
4 rexim 2802 . 2  |-  ( A. x  e.  A  ( ps  ->  ch )  -> 
( E. x  e.  A  ps  ->  E. x  e.  A  ch )
)
53, 4syl 16 1  |-  ( ph  ->  ( E. x  e.  A  ps  ->  E. x  e.  A  ch )
)
Colors of variables: wff set class
Syntax hints:    -> wi 4   F/wnf 1553    e. wcel 1725   A.wral 2697   E.wrex 2698
This theorem is referenced by:  reximdvai  2808  tz7.49  6694  hsmexlem2  8299  indexdom  26427  filbcmb  26433  infrglb  27689  stoweidlem31  27747  stoweidlem34  27750  stoweidlem35  27751  2reurex  27926  cdlemefr29exN  31136
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1555  ax-5 1566  ax-17 1626  ax-9 1666  ax-8 1687  ax-11 1761
This theorem depends on definitions:  df-bi 178  df-an 361  df-ex 1551  df-nf 1554  df-ral 2702  df-rex 2703
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