Metamath Proof Explorer

Theorem anclb

Description: Conjoin antecedent to left of consequent. Theorem *4.7 of WhiteheadRussell p. 120. (Contributed by NM, 25-Jul-1999) (Proof shortened by Wolf Lammen, 24-Mar-2013)

Ref Expression
Assertion anclb φ ψ φ φ ψ


Step Hyp Ref Expression
1 ibar φ ψ φ ψ
2 1 pm5.74i φ ψ φ φ ψ