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Theorem pm4.24 627
Description: Theorem *4.24 of [WhiteheadRussell] p. 117. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm4.24  |-  ( ph  <->  (
ph  /\  ph ) )

Proof of Theorem pm4.24
StepHypRef Expression
1 id 21 . 2  |-  ( ph  ->  ph )
21pm4.71i 616 1  |-  ( ph  <->  (
ph  /\  ph ) )
Colors of variables: wff set class
Syntax hints:    <-> wb 178    /\ wa 360
This theorem is referenced by:  anidm  628  anabsan  789  nic-ax  1433  euind  2920  reuind  2934  disjprg  3979  wesn  4735  sqrlem5  11683  crngunit  15392  lmodvscl  15592  isclo2  16773  vitalilem1  18911  iscola2  25445  prtlem16  26090
This theorem was proved from axioms:  ax-1 7  ax-2 8  ax-3 9  ax-mp 10
This theorem depends on definitions:  df-bi 179  df-an 362
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