Metamath Proof Explorer

Theorem pm3.4

Description: Conjunction implies implication. Theorem *3.4 of WhiteheadRussell p. 113. (Contributed by NM, 31-Jul-1995)

Ref Expression
Assertion pm3.4 
|- ( ( ph /\ ps ) -> ( ph -> ps ) )

Proof

Step Hyp Ref Expression
1 simpr 
 |-  ( ( ph /\ ps ) -> ps )
2 1 a1d 
 |-  ( ( ph /\ ps ) -> ( ph -> ps ) )