Metamath Proof Explorer

Theorem pm3.41

Description: Theorem *3.41 of WhiteheadRussell p. 113. (Contributed by NM, 3-Jan-2005)

Ref Expression
Assertion pm3.41 
|- ( ( ph -> ch ) -> ( ( ph /\ ps ) -> ch ) )

Proof

Step Hyp Ref Expression
1 simpl 
 |-  ( ( ph /\ ps ) -> ph )
2 1 imim1i 
 |-  ( ( ph -> ch ) -> ( ( ph /\ ps ) -> ch ) )