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Theorem pm4.24 375
Description: Theorem *4.24 of [WhiteheadRussell] p. 117. (Contributed by NM, 3-Jan-2005.) (Revised by NM, 14-Mar-2014.)
Assertion
Ref Expression
pm4.24  |-  ( ph  <->  (
ph  /\  ph ) )

Proof of Theorem pm4.24
StepHypRef Expression
1 id 19 . 2  |-  ( ph  ->  ph )
21pm4.71i 371 1  |-  ( ph  <->  (
ph  /\  ph ) )
Colors of variables: wff set class
Syntax hints:    /\ wa 97    <-> wb 98
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101
This theorem depends on definitions:  df-bi 110
This theorem is referenced by:  anidm  376  anabsan  509  sbidm  1731  euind  2728  reuind  2744
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