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Theorem pm3.42 325
Description: Theorem *3.42 of [WhiteheadRussell] p. 113. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm3.42  |-  ( ( ps  ->  ch )  ->  ( ( ph  /\  ps )  ->  ch )
)

Proof of Theorem pm3.42
StepHypRef Expression
1 simpr 108 . 2  |-  ( (
ph  /\  ps )  ->  ps )
21imim1i 59 1  |-  ( ( ps  ->  ch )  ->  ( ( ph  /\  ps )  ->  ch )
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 102
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia2 105
This theorem is referenced by: (None)
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