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Theorem pm5.3 695
Description: Theorem *5.3 of [WhiteheadRussell] p. 125. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Andrew Salmon, 7-May-2011.)
Assertion
Ref Expression
pm5.3  |-  ( ( ( ph  /\  ps )  ->  ch )  <->  ( ( ph  /\  ps )  -> 
( ph  /\  ch )
) )

Proof of Theorem pm5.3
StepHypRef Expression
1 impexp 435 . 2  |-  ( ( ( ph  /\  ps )  ->  ch )  <->  ( ph  ->  ( ps  ->  ch ) ) )
2 imdistan 673 . 2  |-  ( (
ph  ->  ( ps  ->  ch ) )  <->  ( ( ph  /\  ps )  -> 
( ph  /\  ch )
) )
31, 2bitri 242 1  |-  ( ( ( ph  /\  ps )  ->  ch )  <->  ( ( ph  /\  ps )  -> 
( ph  /\  ch )
) )
Colors of variables: wff set class
Syntax hints:    -> wi 6    <-> wb 178    /\ wa 360
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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