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Theorem alral 2708
Description: Universal quantification implies restricted quantification. (Contributed by NM, 20-Oct-2006.)
Assertion
Ref Expression
alral  |-  ( A. x ph  ->  A. x  e.  A  ph )

Proof of Theorem alral
StepHypRef Expression
1 ax-1 5 . . 3  |-  ( ph  ->  ( x  e.  A  ->  ph ) )
21alimi 1565 . 2  |-  ( A. x ph  ->  A. x
( x  e.  A  ->  ph ) )
3 df-ral 2655 . 2  |-  ( A. x  e.  A  ph  <->  A. x
( x  e.  A  ->  ph ) )
42, 3sylibr 204 1  |-  ( A. x ph  ->  A. x  e.  A  ph )
Colors of variables: wff set class
Syntax hints:    -> wi 4   A.wal 1546    e. wcel 1717   A.wral 2650
This theorem is referenced by:  find  4811  brdom5  8341  brdom4  8342  sumeq2w  12414  rpnnen2  12753  prodeq2w  25018  elpotr  25162  rexrsb  27616  ordelordALTVD  28321
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1552  ax-5 1563
This theorem depends on definitions:  df-bi 178  df-ral 2655
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