Metamath Proof Explorer


Theorem pm3.2

Description: Join antecedents with conjunction ("conjunction introduction"). Theorem *3.2 of WhiteheadRussell p. 111. Its associated inference is pm3.2i and its associated deduction is jca (and the double deduction is jcad ). See pm3.2im for a version using only implication and negation. (Contributed by NM, 5-Jan-1993) (Proof shortened by Wolf Lammen, 12-Nov-2012)

Ref Expression
Assertion pm3.2
|- ( ph -> ( ps -> ( ph /\ ps ) ) )

Proof

Step Hyp Ref Expression
1 id
 |-  ( ( ph /\ ps ) -> ( ph /\ ps ) )
2 1 ex
 |-  ( ph -> ( ps -> ( ph /\ ps ) ) )